PrivateBancorp (PVTB) 10-K 2 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Feb. 27, 2015
Document Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	PRIVATEBANCORP, INC
Entity Central Index Key	889936
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$2,154,565,430
Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			78,509,422
Nonvoting Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			0

Consolidated_Statements_Of_Fin

Consolidated Statements Of Financial Condition (USD $)	Dec. 31, 2014		Dec. 31, 2013
Assets
Cash and due from banks	$132,211,000		$133,518,000
Federal funds sold and interest-bearing deposits in banks	292,341,000		306,544,000
Loans held-for-sale	115,161,000		26,816,000
Securities available-for-sale, at fair value (pledged as collateral to creditors: $86.5 million - 2014; $108.1 million - 2013)	1,645,344,000		1,602,476,000
Securities held-to-maturity, at amortized cost (fair value: $1.1 billion - 2014; $896.9 million - 2013)	1,129,285,000		921,436,000
Federal Home Loan Bank (FHLB) stock	28,666,000		30,005,000
Loans – excluding covered assets, net of unearned fees	11,892,219,000		10,644,021,000
Allowance for loan losses	-152,498,000		-143,109,000
Loans, net of allowance for loan losses and unearned fees	11,739,721,000		10,500,912,000
Covered assets	34,132,000		112,746,000
Allowance for covered loan losses	-5,191,000		-16,511,000
Covered assets, net of allowance for covered loan losses	28,941,000		96,235,000
Other real estate owned, excluding covered assets	17,416,000		28,548,000
Premises, furniture, and equipment, net	39,143,000		39,704,000
Accrued interest receivable	40,531,000		37,004,000
Investment in bank owned life insurance	55,207,000		53,865,000
Goodwill	94,041,000		94,041,000
Other intangible assets	5,885,000		8,892,000
Derivative Asset	43,062,000		48,422,000
Other assets	196,427,000		157,328,000
Total assets	15,603,382,000		14,085,746,000
Liabilities
Noninterest-bearing demand deposits	3,516,695,000		3,172,676,000
Interest-bearing demand deposits	1,907,320,000		1,470,856,000
Savings deposits and money market accounts	5,171,025,000		4,799,561,000
Time deposits	2,494,928,000		2,570,548,000
Total deposits	13,089,968,000	[1]	12,013,641,000
Deposits held-for-sale	122,216,000		0
short term and secured borrowing	432,385,000		8,400,000
Long-term debt	344,788,000		627,793,000
Accrued interest payable	6,948,000		6,326,000
Derivative liabilities	26,767,000		48,890,000
Other liabilities	98,631,000		78,792,000
Total liabilities	14,121,703,000		12,783,842,000
Equity
Treasury stock	-53,000		-6,415,000
Additional paid-in capital	1,034,048,000		1,022,023,000
Retained earnings	349,556,000		199,627,000
Accumulated other comprehensive income, net of tax	20,917,000		9,844,000
Total equity	1,481,679,000		1,301,904,000
Total liabilities and equity	15,603,382,000		14,085,746,000
Common Stock [Member]
Equity
Common stock	77,211,000		75,240,000
Common Stock, Stated value, Per Share	$1		$1
Common stock, Shares authorized	174,000,000		174,000,000
Common Stock, Shares issued	78,180,000		76,397,000
Common stock, Shares outstanding	78,178,000		76,123,000
Treasury shares	2,000		274,000
Nonvoting Common Stock [Member]
Equity
Common stock	$0		$1,585,000
Common Stock, Stated value, Per Share	$1		$1
Common stock, Shares authorized	5,000,000		5,000,000
Common Stock, Shares issued	0		1,585,000
Common stock, Shares outstanding	0		1,585,000
Series B Preferred Stock [Member]
Equity
Preferred stock, Shares authorized	1,000,000		1,000,000
Preferred stock, Shares issued	0		0
Preferred stock, Shares outstanding	0		0
[1]	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.

Consolidated_Statements_Of_Fin1

Consolidated Statements Of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Securities available-for-sale, pledged as collateral to creditors	$86,527	$108,071
Securities held-to-maturity, fair value	1,132,615	896,908
Securities held-to-maturity, pledged as collateral to creditors	$0	$0

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Loans, including fees	$463,755	$433,829	$423,211
Federal funds sold and interest-bearing deposits in banks	770	652	965
Securities:
Taxable	53,500	51,310	56,826
Exempt from Federal income taxes	6,173	6,200	5,487
Other interest income	189	247	547
Total interest income	524,387	492,238	487,036
Interest Expense
Interest-bearing demand deposits	3,728	4,202	3,378
Savings deposits and money market accounts	16,857	16,350	17,604
Time deposits	21,366	20,161	21,832
Short-term and secured borrowings	638	850	443
Long-term debt	27,061	29,612	23,846
Total interest expense	69,650	71,175	67,103
Net interest income (loss)	454,737	421,063	419,933
Provision for loan and covered loan losses	12,044	31,796	71,425
Net interest income after provision for loan and covered loan losses	442,693	389,267	348,508
Non-interest Income
Asset Management	17,268	18,377	17,017
Mortgage banking	10,245	12,172	13,460
Capital markets products	18,047	20,728	25,958
Treasury management	27,472	24,668	21,510
Loan, letter ofcredit and commitment fees	19,311	17,217	18,173
Syndication fees	19,514	13,447	9,107
Deposit service charges and fees and other income	5,203	6,207	6,021
Net securities gains (losses)	530	1,174	-205
Total non-interest income	117,590	113,990	111,041
Non-interest Expense
Salaries and employee benefits	182,192	166,929	174,948
Net occupancy and equipment expense	31,258	30,027	30,571
Technology and related costs	13,281	13,726	13,250
Marketing	13,441	12,590	10,311
Professional services	11,761	8,539	8,353
Outsourced servicing costs	6,864	6,817	7,419
Net foreclosed property expenses	8,681	20,194	38,296
Postage, telephone, and delivery	3,400	3,521	3,497
Insurance	12,451	10,867	15,186
Loan and collection expense	6,765	8,753	11,631
Other expenses	21,982	21,351	13,670
Total non-interest expense	312,076	303,314	327,132
Income (loss) before income taxes	248,207	199,943	132,417
Income tax provision (benefit)	95,128	76,994	54,521
Net income (loss)	153,079	122,949	77,896
Preferred stock dividends and discount accretion	0	0	13,368
Net income (loss) available to common stockholders	$153,079	$122,949	$64,528
Per Common Share Data
Basic earnings per common share	$1.96	$1.58	$0.88
Diluted earnings per share	$1.94	$1.57	$0.88
Cash dividends declared (per share)	$0.04	$0.04	$0.04
Weighted-average common shares outstanding	77,007	76,398	71,951
Weighted-average diluted common shares outstanding	77,822	76,645	72,174

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Net income	$153,079		$122,949		$77,896
Available-for-sale securities:
Net unrealized gains (losses)	11,244		-46,690		-4,185
Reclassification of net gains (losses) included in net income (loss)	-530		-1,174		-315
Income tax benefit (expense)	-4,226		18,605		1,579
Net unrealized (losses) gains on available-for-sale securities	6,488		-29,259		-2,921
Cash flow hedges:
Net unrealized gains (losses) on cash flow hedges	16,777		-8,729		9,945
Reclassification of net gains (losses) included in net income (loss)	-9,262		-5,984		-2,928
Income tax benefit (expense)	-2,930		5,752		-2,729
Net unrealized gains (losses) on cash flow hedges	4,585		-8,961		4,288
Other comprehensive income (loss)	11,073		-38,220		1,367
Comprehensive income (loss)	$164,152	[1]	$84,729	[1]	$79,263	[1]
[1]	Net of taxes and reclassification adjustments.

Consolidated_Statements_Of_Cha

Consolidated Statements Of Changes In Equity (USD $)		Total	Common Shares Outstanding [Member]	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]		Accumulated Other Comprehensive Income [Member]
In Thousands, except Share data, unless otherwise specified		USD ($)		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)		USD ($)
Beginning Balance at Dec. 31, 2011		$1,296,752		$240,403	$71,483	($21,454)	$941,404	$18,219		$46,697
Beginning Balance (in shares) at Dec. 31, 2011			71,745,000
Comprehensive Income (loss):
Net income attributable to parent		77,896						77,896	[1]
Other comprehensive income (loss)		1,367								1,367	[1]
Total comprehensive income (loss)	[1]	79,263
Cash dividends declared:
Common stock ($0.04 per share)		-2,948					0	-2,948
Common Stock, Dividends, Per Share, Cash Paid		$0.04
Preferred stock		-9,956					0	-9,956
New issuance, net of cost, shares			4,761,000
New issuance, net of costs		70,657			4,761		65,896
Nonvested (restricted) stock grants, shares			709,000
Nonvested (restricted) stock grants		0					0
Exercise of stock options, shares		95,000	54,000
Exercise of stock options		311			54		257
Restricted stock activity, shares			-43,000
Restricted stock activity		-32			650		-682
Deferred compensation plan, shares			17,000
Deferred compensation plan		200			17		183
Redemption of preferred stock		-243,815		-243,815
Repurchase of common stock warrant		-1,225			0		-1,225
Accretion of preferred stock discount		0		3,412				-3,412
Stock repurchased in connection with benefit plans, shares			-178,000
Stock repurchased in connection with benefit plans		-2,696				-2,696
Share-based compensation expense, shares			50,000
Share-based compensation expense		20,655			50		20,605
Ending Balance at Dec. 31, 2012		1,207,166		0	77,015	-24,150	1,026,438	79,799		48,064
Ending Balance (in shares) at Dec. 31, 2012			77,115,000
Comprehensive Income (loss):
Net income attributable to parent		122,949						122,949	[1]
Other comprehensive income (loss)		-38,220								-38,220	[1]
Total comprehensive income (loss)	[1]	84,729
Cash dividends declared:
Common stock ($0.04 per share)		-3,121						-3,121
Common Stock, Dividends, Per Share, Cash Paid		$0.04
Nonvested (restricted) stock grants, shares			597,000
Nonvested (restricted) stock grants		0			-597	15,166	-14,569
Exercise of stock options, shares		200,000	197,000
Exercise of stock options		2,846			5	4,536	-1,695
Restricted stock activity, shares			-77,000
Restricted stock activity		-171			401	218	-790
Deferred compensation plan, shares			13,000
Deferred compensation plan		301		0	1	337	-37
Stock repurchased in connection with benefit plans, shares			-138,000
Stock repurchased in connection with benefit plans		-2,522				-2,522
Share-based compensation expense		12,676					12,676
Ending Balance at Dec. 31, 2013		1,301,904		0	76,825	-6,415	1,022,023	199,627		9,844
Ending Balance (in shares) at Dec. 31, 2013			77,707,000
Comprehensive Income (loss):
Net income attributable to parent		153,079						153,079	[1]
Other comprehensive income (loss)		11,073								11,073	[1]
Total comprehensive income (loss)	[1]	164,152
Cash dividends declared:
Common stock ($0.04 per share)		-3,150						-3,150
Common Stock, Dividends, Per Share, Cash Paid		$0.04
Nonvested (restricted) stock grants, shares			378,000
Nonvested (restricted) stock grants		0			-244	5,607	-5,363
Exercise of stock options, shares		277,000	277,000
Exercise of stock options		5,149			93	5,340	-284
Restricted stock activity, shares			-16,000
Restricted stock activity		0			537	360	-897
Deferred compensation plan, shares			13,000
Deferred compensation plan		449				385	64
Excess (shortfall) tax benefit from share-based compensation		2,937					2,937
Stock repurchased in connection with benefit plans, shares			-181,000
Stock repurchased in connection with benefit plans		-5,330				-5,330
Share-based compensation expense		15,568					15,568
Ending Balance at Dec. 31, 2014		$1,481,679			$77,211	($53)	$1,034,048	$349,556		$20,917
Ending Balance (in shares) at Dec. 31, 2014			78,178,000
[1]	Net of taxes and reclassification adjustments.

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating Activities
Net income	$153,079,000		$122,949,000		$77,896,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and covered loan losses	12,044,000		31,796,000		71,425,000
Provision For Unfunded Commitments	3,152,000	[1]	1,863,000	[1]	66,000	[1]
Depreciation of premises, furniture, and equipment	8,693,000		8,461,000		9,293,000
Net amortization of premium on securities	14,899,000		16,435,000		15,861,000
Net losses (gains) on sale of securities	-530,000		-1,174,000		205,000
Valuation adjustments on other real estate owned	6,479,000		19,458,000		25,248,000
Net (gains) losses on sales of other real estate owned	189,000		-1,735,000		5,996,000
Net amortization (accretion) of discount on covered assets	136,000		1,483,000		1,828,000
Bank owned life insurance income	-1,342,000		-1,352,000		-1,547,000
Net increase (decrease) in deferred fees and unamortized discounts and premiums on loans	9,954,000		-2,593,000		408,000
Share-based compensation expense	15,568,000		12,676,000		20,655,000
Excess tax benefit from exercise of stock options and vesting of restricted shares	-3,588,000		-723,000		-118,000
Provision for deferred income tax expense (benefit)	-8,184,000		14,646,000		15,828,000
Amortization of other intangibles	3,007,000		3,121,000		2,684,000
Originations and purchases of loans held-for-sale	-518,147,000		-514,244,000		-587,064,000
Proceeds from sales of loans held-for-sale	438,254,000		548,126,000		581,143,000
Net gains (losses) from sales of loans held-for-sale	-8,199,000		-11,237,000		-11,848,000
Net (increase) decrease in derivative assets and liabilities	-16,763,000		6,453,000		160,000
Net decrease (increase) in accrued interest receivable	-3,527,000		-2,172,000		900,000
Net increase (decrease) in accrued interest payable	622,000		-815,000		1,574,000
Net (increase) decrease in other assets	-27,830,000		-16,491,000		-17,161,000
Net (decrease) increase in other liabilities	16,662,000		5,422,000		-11,504,000
Net cash provided by operating activities	94,628,000		240,353,000		201,928,000
Available-for-sale securities:
Proceeds from maturities, prepayments, and calls	232,967,000		316,803,000		424,917,000
Proceeds from sales	74,690,000		114,740,000		20,905,000
Purchases	-349,320,000		-641,016,000		-129,871,000
Held-to-maturity securities:
Proceeds from maturities, prepayments, and calls	120,844,000		123,913,000		82,621,000
Purchases	-333,553,000		-186,589,000		-459,897,000
Net (purchase) redemption of FHLB stock	1,339,000		13,382,000		-2,692,000
Net increase in loans	-1,270,685,000		-568,557,000		-1,260,301,000
Net decrease in covered assets	67,564,000		71,855,000		108,286,000
Proceeds from sale of other real estate owned	13,936,000		52,919,000		42,162,000
Net purchases of premises, furniture, and equipment	-8,174,000		-8,657,000		-8,564,000
Net cash used in investing activities	-1,450,392,000		-711,207,000		-1,182,434,000
Financing Activities
Net increase (decrease) in deposit accounts, including deposits held-for-sale	1,198,543,000		-159,993,000		1,780,780,000
Net increase (decrease) in short-term and secured borrowings, excluding FHLB advances	-2,015,000		6,400,000		0
Net increase (decrease) in FHLB advances	218,000,000		245,000,000		-156,000,000
Repayment of long-term debt	-75,005,000		-120,000,000
Proceeds from the issuance of long-term debt	0		0		125,000,000
Payments for the redemption of preferred stock	0		0		-243,815,000
Payments for the redemption of common stock warrant	0		0		-1,225,000
Net proceeds from (payments for) the issuance of common stock	0		0		70,657,000
Stock repurchased in connection with benefit plans	-5,330,000		-2,522,000		-2,696,000
Cash dividends paid	-3,125,000		-3,119,000		-13,082,000
Proceeds from exercise of stock options and issuance of common stock under benefit plans	5,598,000		2,976,000		479,000
Excess tax benefit from exercise of stock options and vesting of restricted shares	3,588,000		723,000		118,000
Net cash (used in) provided by financing activities	1,340,254,000		-30,535,000		1,560,216,000
Net (decrease) increase in cash and cash equivalents	-15,510,000		-501,389,000		579,710,000
Cash and cash equivalents at beginning of year	440,062,000		941,451,000		361,741,000
Cash and cash equivalents at end of year	424,552,000		440,062,000		941,451,000
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	69,028,000		71,990,000		65,529,000
Cash paid for income taxes	99,820,000		47,183,000		58,328,000
Non-cash transfers: [Abstract]
Non-cash transfers of loans to loans held-for-sale	182,831,000		27,243,000		24,108,000
Non-cash transfers of loans to other real estate	8,753,000		17,310,000		29,557,000
Non-cash transfers of covered assets to loans	28,692,000		0		0
Non-cash transfers of covered asset OREO to other real estate	719,000		0		0
Non-cash transfers of deposits to deposits held-for-sale	$122,216,000		$0		$0
[1]	Unfunded commitments include commitments to extend credit, standby letters of credit and commercial letters of credit. Unfunded commitments related to covered assets are excluded as they are covered under a loss sharing agreement with the FDIC.

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations – PrivateBancorp, Inc. ("PrivateBancorp" or the "Company") was incorporated in Delaware in 1989 and became a holding company registered under the Bank Holding Company Act of 1956, as amended. The PrivateBank and Trust Company (the "Bank" or the "PrivateBank"), the sole banking subsidiary of PrivateBancorp, was opened in Chicago in 1991. The Company completed its initial public offering in June 1999. The Bank provides customized business and personal financial services to middle market companies and business owners, executives, entrepreneurs and families in all of the markets and communities it serves. The majority of the Bank’s business is conducted in the greater Chicago market.
	Principles of Consolidation and Basis of Presentation – The accompanying consolidated financial statements include the accounts and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. In general, investments in unconsolidated entities where the Company has the ability to exercise significant influence over the entities' operating and financing decisions are accounted for using the equity method of accounting. Investments that do not meet the criteria for equity method accounting are accounted for using the cost method of accounting. Assets held in a fiduciary or agency capacity are not assets of the Company or its subsidiaries, and accordingly, are not included in the consolidated financial statements.
	The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles ("U.S. GAAP") and general practice within the banking industry. We use the accrual basis of accounting for financial reporting purposes.
	Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
	In preparing the consolidated financial statements, we have considered the impact of events occurring subsequent to December 31, 2014 for potential recognition or disclosure in this annual report on Form 10-K. The following is a summary of the significant accounting policies adhered to in the preparation of the consolidated financial statements.
	Business Combinations – Business combinations are accounted for under the acquisition method of accounting. Under the acquisition method, assets and liabilities of the business acquired are recorded at their estimated fair value as of the date of acquisition, with any excess of the cost of the acquisition over the fair value of the net tangible and identifiable intangible assets acquired recorded as goodwill. Results of operations of the acquired business are included in the Consolidated Statements of Income from the effective date of acquisition.
	Use of Estimates – The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates.
	Cash and Cash Equivalents – For purposes of the Consolidated Statements of Cash Flows, management has defined cash and cash equivalents to include cash and due from banks, federal funds sold, and other interest-bearing deposits in banks. Generally, federal funds are sold for one-day periods, but not longer than 30 days. Short-term investments generally mature in less than 30 days. All cash and cash equivalents have maturities of three months or less.
	Debt Securities – At the time of purchase, debt securities are classified as held-to-maturity or available-for-sale. Debt securities are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are carried at amortized cost. Debt securities are classified as available-for-sale when management has the intent and ability to hold such securities for an indefinite period of time, but not necessarily to maturity. Any decision to sell available-for-sale securities would be based on various factors, including, but not limited to asset/liability management strategies, changes in interest rates or prepayment risks, liquidity needs, or regulatory capital considerations. Available-for-sale securities are carried at fair value with unrealized gains and losses, net of related deferred income taxes, recorded as a separate component of other comprehensive income ("OCI").
	The historical cost of debt securities is adjusted for amortization of premiums and accretion of discounts over the life of the security, using the level-yield method. Amortization of premium and accretion of discount are included in interest income.
	Purchases and sales of securities are recognized on a trade date basis. Realized securities gains or losses are reported in net securities gains (losses) in the Consolidated Statements of Income. The cost of securities sold is based on the specific identification method. On a quarterly basis, we assess whether there have been any events or circumstances to indicate that a security for which there is an unrealized loss is impaired on an other-than-temporary ("OTTI") basis. This determination requires significant judgment. OTTI is considered to have occurred (1) if management intends to sell the security; (2) if it is more likely than not we will be required to sell the security before recovery of its amortized cost basis; or (3) if the present value of the expected cash flows is not sufficient to recover the entire amortized cost basis. For debt securities that we do not expect to sell or for which it is not more likely than not that the Company will be required to sell prior to recovery, the OTTI is separated into credit and noncredit components. The credit-related OTTI, represented by the expected loss in principal, is recognized in non-interest income, while noncredit-related OTTI is recognized in OCI. Noncredit-related OTTI results from other factors, including increased liquidity spreads and changes in risk-free interest rates. All of the OTTI is recognized in earnings for securities we expect to sell.
	Federal Home Loan Bank ("FHLB") Stock – Investments in FHLB stock are restricted as to redemption and are carried at cost.
	Loans Held for Sale – Loans held for sale ("LHFS") represent mortgage loan originations intended to be sold in the secondary market and other loans that management has an active plan to sell. LHFS are carried at the lower of cost or fair value as determined on an individual asset basis or carried at fair value where the Company has elected fair value accounting. The Company has elected to measure residential mortgage loans originated as held for sale under the fair value option. Increases or decreases in the fair value of these LHFS are recognized in mortgage banking income in the Consolidated Statements of Income. Mortgage loan origination costs related to LHFS that the Company accounts for under the fair value option are recognized in noninterest expense as incurred. Held for investment loans that have been transferred to LHFS are carried at the lower of cost or fair value. For these LHFS, any decreases in value below cost are recognized in other income in the Consolidated Statements of Income and increases in fair value above cost are not recognized until the loans are sold. The credit component of any write down upon transfer to LHFS is reflected in charge-offs to the allowance for loan losses. Loan origination costs for LHFS carried at the lower of cost or fair value are capitalized as part of the carrying amount of the loans.
	Gains and losses on the disposition of loans held for sale are determined on the specific identification method. Residential mortgage loans sold in the secondary market are sold without retaining servicing rights.
	Originated Loans Held for Investment – Originated loans held for investment are carried at the principal amount outstanding, net of deferred loan fees and costs and any direct principal charge-offs. Interest income on loans is accrued based on principal amounts outstanding. Loan origination fees, fees for commitments that are expected to be exercised and certain direct loan origination costs are deferred and the net amount is amortized over the life of the related loan or commitment period as a yield adjustment. Other fees not associated with originating a loan are recognized as fee income when earned.
	Impaired Loans – Impaired loans consist of nonaccrual loans (which include nonaccrual troubled debt restructurings ("TDRs")) and loans classified as accruing TDRs. A loan is considered impaired when, based on current information and events, management believes that either it is probable that we will be unable to collect all amounts due (both principal and interest) according to the original contractual terms of the loan agreement or it has been classified as a TDR. Once a loan is determined to be impaired, the amount of impairment is measured based on the loan’s observable fair value; fair value of the underlying collateral less estimated selling costs, if the loan is collateral-dependent; or the present value of expected future cash flows discounted at the loan’s effective interest rate.
	If the measurement of the impaired loan is less than the recorded investment in the loan (including accrued interest, net of deferred loan fees and costs and unamortized premium or discount), impairment is recognized by creating a specific valuation reserve as a component of the allowance for loan losses. Non-TDR impaired loans and nonaccrual TDRs exceeding $500,000 are evaluated individually, while non-TDR impaired loans and nonaccrual TDRs less than $500,000 are evaluated as pools using historical loss experience, as well as management’s loss expectations, for the respective asset class and product type. All accruing TDRs, no matter the balance, are evaluated individually.
	All impaired loans and their related reserves are reviewed and updated each quarter. Any impaired loan for which a determination has been made that the economic value is permanently reduced is charged-off against the allowance for loan losses in the period in which the determination has been made, to reflect its current economic value.
	At the time a collateral-dependent loan is initially determined to be impaired, we review the existing collateral appraisal. If the most recent appraisal is greater than one-year old, a new appraisal of the underlying collateral is obtained. The majority of collateral-dependent impaired loans are secured by real estate for which we generally obtain "as is" appraisal values in order to evaluate impairment. When a collateral-dependent loan is secured by non-real estate collateral such as receivables, inventory, or equipment, the fair value is generally determined based upon appraisals, field exams, or receivable reports. The valuation techniques and inputs are reviewed internally by workout and/or asset-based specialists for reasonableness of estimated liquidation costs, collectability probabilities, and other market data. Appraisals for real estate collateral-dependent impaired loans in excess of $500,000 are updated with new independent appraisals at least annually and are formally reviewed by our internal appraisal department. Additional diligence is performed at the six-month interval between annual appraisals. If during the course of the six-month review process there is evidence supporting a meaningful decline in the value of collateral, the appraised value is either adjusted downward or a new appraisal is required to support the value of the impaired loan. With a de minimis number of exceptions, all appraisals and internal reviews are current under this methodology at December 31, 2014.
	Delinquent and Nonaccrual Loans – Loans are reported as past due if contractual principal or interest payments are due and unpaid for 30 days or more. All loans that are over 90 days past due in principal or interest are considered "impaired" and placed on nonaccrual status. Management may also place some loans on nonaccrual status before they are 90 days past due if they meet the below definition of "impaired." When a loan is placed on nonaccrual status, accrued and unpaid interest credited to income is reversed and accretion of net deferred loan fees ceases. Subsequent receipts on nonaccrual loans are recorded as a reduction of principal, and interest income may only be recorded on a cash basis if the remaining recorded investment is deemed fully collectible. Nonaccrual loans are returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement and when the financial position of the borrower and other relevant factors indicate there is no longer doubt as to such collectibility.
	Restructured Loans – Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. These modifications are structured on a loan-by-loan basis, and depending on the circumstances, may include extensions of maturity dates, rate reductions, forgiveness of principal, or other concessions. The Company may also utilize a multiple note structure as a workout alternative for certain loans. The multiple note structure typically bifurcates a troubled loan into two separate notes, where the first note is reasonably assured of repayment and performance according to the modified terms, and the portion of the troubled loan that is not reasonably assured of repayment is charged-off. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Company has granted a concession that it would not otherwise consider, are considered TDRs.
	We consider many factors in determining whether to agree to a loan modification involving concessions, and seek a solution that will both minimize potential loss to the Company and attempt to help the borrower. We evaluate our borrowers’ current and forecasted future cash flows, their ability and willingness to make current contractual or proposed modified payments, the value of the underlying collateral (if applicable), the possibility of obtaining additional security or guarantees, and the potential costs related to a repossession or foreclosure and the subsequent sale of the collateral.
	Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Generally, a nonaccrual loan that is restructured remains on nonaccrual for a period of at least six months to ensure that the borrower performs in accordance with the restructured terms including consistent and timely loan payments. However, the borrower’s performance prior to the restructuring or other significant events at the time of the restructuring may be considered in assessing whether the borrower can meet the new terms and may result in the loan being returned to accrual status after a shorter performance period or concurrent with the restructuring. In such situations, the loan will be reported as a "restructured loan accruing interest." If the borrower’s performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan.
	Allowance for Loan Losses (the "Allowance") – We maintain an allowance for loan losses at a level management believes is sufficient to absorb credit losses inherent in our loan portfolio. The allowance for loan losses is assessed quarterly and represents an accounting estimate of probable losses in the portfolio at each balance sheet date based on a review of available and relevant information at that time. The allowance consists of reserves for probable losses that have been identified relating to specific borrowing relationships that are individually evaluated for impairment ("the specific component"), as well as probable losses inherent in our loan portfolio that are not specifically identified ("the general allocated component"), which is determined using a methodology that is a function of quantitative and qualitative factors applied to segments of our loan portfolio.
	The specific component relates to impaired loans. Impaired loans consist of nonaccrual loans (which include nonaccrual TDRs) and loans classified as accruing TDRs. See "Impaired Loans" section of this Note 1 for a detailed discussion of the specific component of the allowance for loan losses.
	To determine the general allocated component of the allowance for loan losses, we segregate loans by vintage ("transformational" and "legacy") and product type (e.g., commercial, commercial real estate) because of observable similarities in the historical performance experience of loans underwritten by these business units. In general, loans originated by the business units that existed prior to the strategic changes of the Company in 2007 are considered "legacy" loans. Loans originated by a business unit that was established in connection with or following the strategic business transformation plan are considered "transformational" loans. Renewals or restructurings of legacy loans may continue to be evaluated as legacy loans depending on the structure or defining characteristics of the new transaction. The Company has implemented a line of business model that has reorganized the legacy business units so that after 2009, all new loan originations are considered transformational. At the time an accruing loan becomes modified and meets the definition of a TDR, it is considered impaired and is no longer included as part of the general allocated component. However, our general reserve methodology considers the amount and product type of the TDRs removed as one of many credit or portfolio considerations in establishing final reserve requirements.
	The methodology produces an estimated range of potential loss exposure for the product types within each vintage. The methodology also considers where a given product type is within the range of potential losses based on an estimate of the loss emergence period. The loss emergence period is an estimate of the length of time for potential losses embedded in the portfolio today to be recognized. Factors that affect the loss emergence period include the macroeconomic landscape, industry factors, and borrower specific performance. In general, the loss emergence period tends to lengthen in times of improving conditions and shortens in time of economic distress. During 2014, we formally measured the loss emergence period by analyzing recent historical loss data and information aggregated at the product level. This analysis showed that the loss emergence period is lengthening for most product categories. We consider the appropriate balance of the general allocated component of the reserve in relation to a variety of internal and external quantitative and qualitative factors to reflect data or timeframes not captured by the basic allowance framework as well as market and economic data and management judgment. In certain instances, these additional factors and judgments may lead management to conclude that the appropriate level of the reserve is outside the range determined through the basic allowance framework.
	The product segments we evaluate in the general reserve methodology are commercial loans, commercial real estate loans, construction loans and consumer loans (which include personal loans, residential mortgage loans and home equity lines of credit). Our commercial loan portfolio includes lines of credit to businesses and term loans. Certain non-residential owner-occupied commercial real estate loans are also included in our commercial loan portfolio if the cash flows from the owner’s business serve as the primary source of loan repayment. Commercial loans contain risks unique to the business and market of each borrower and the repayment is dependent upon the financial success and viability of the borrower.
	Commercial real estate loans comprise loans secured by various types of collateral including 1-4 family non-owner occupied housing units located primarily in our target market areas, multi-family real estate, office buildings, warehouses, retail space, mixed use buildings, and vacant land, the bulk of which is held for long-term investment or development. Risks inherent in real estate lending are related to the market value of the property taken as collateral, the underlying cash flows and the general economic condition of the market in which the collateral is located. Repayment is generally dependent on the ability of the borrower to attract tenants at rental rates that provide for debt service, and ultimately the long term financing options of the borrower.
	Our construction loan portfolio consists of single-family residential properties, multi-family properties, and commercial projects, and includes both investment properties and properties that will be owner-occupied. Risks inherent in construction lending are similar to those in commercial real estate lending. Additional risks include unexpected cost increases or delays in constructing or improving a property, the borrower’s inability to generate funding until the project is complete, the more pronounced risk to interest rate movements and the real estate market that these borrowers face while a project is being completed or seeking a buyer, and the lack of availability of permanent financing. Construction loans, as a product segment, have the highest inherent risk in our portfolio.
	Consumer loans are a smaller portion of our overall portfolio and consist of residential home mortgages, home equity lines of credit and personal loans. The risk issues associated with these products are closely correlated to the U.S. housing market and the local markets in which the collateral resides and include home price declines and resulting increases in loan to value ratios, low sales volume, high unemployment rates, increases in foreclosure rates, and high delinquency rates. Some personal loans may be unsecured and therefore offer little secondary source of repayment.
	Determination of the allowance is inherently subjective, as it requires significant estimates, including the amounts and timing of expected future cash flows and collateral appraisal values on impaired loans; estimated losses on pools of homogeneous loans based on historical loss experience, risk ratings, product type, and vintage; and consideration of current economic trends and portfolio attributes, all of which may be susceptible to significant change. For instance, loss rates in our allowance methodology typically reflect the Company's more recent loss experience, by product, on a trailing twelve month basis. These loss rates consider both cumulative charge-offs and other real estate owned ("OREO") valuation adjustments over the period in the individual product categories that constitute our allowance. Default estimates use a multi-year originating vintage and rating approach. In addition, we compare current model-derived and historic reserve levels to recent charge-off trends and history in considering the appropriate reserve at each product level.
	Credit exposures deemed to be uncollectible are charged-off against the allowance, while recoveries of amounts previously charged-off are credited to the allowance. A provision for loan losses, which is a charge against earnings, is recorded to bring the allowance for loan losses to a level that, in management’s judgment, is appropriate to absorb probable losses in the loan portfolio as of the balance sheet date.
	Reserve for Unfunded Commitments – We maintain a reserve for unfunded commitments at a level we believe to be sufficient to absorb estimated probable losses related to unfunded credit facilities. The reserve is included in other liabilities on the Consolidated Statements of Financial Condition. The reserve is computed using a methodology similar to that used to determine the general allocated component of the allowance for loan losses and is based on a model that uses recent commitment utilization patterns at the product level as a method of predicting future usage across the portfolio. Net adjustments to the reserve for unfunded commitments are included in other non-interest expense in the Consolidated Statements of Income.
	Purchased Loans – Purchased loans acquired through portfolio purchases or in a business combination are accounted for under specialized accounting guidance when the loans have evidence of credit deterioration at the time of acquisition and it is probable that not all contractual payments will be collected ("purchased impaired loans"). Evidence of credit quality deterioration as of the purchase date may include statistics such as past due and nonaccrual status, declines in borrower FICO scores, and declines in loan-to-value ratios.
	U.S. GAAP requires purchased loans not subject to the specialized accounting guidance ("purchased non-impaired loans") to be recorded at fair value at the acquisition date and prohibits the "carrying over" or creation of valuation allowances in the initial accounting for loans acquired in a transfer. Differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the life of the loan. Decreases in expected cash flows after the purchase date are recognized by recording an allowance for loan losses.
	The fair values for purchased impaired loans are determined by discounting cash flows expected to be collected using an observable discount rate for similar instruments with adjustments to the discount rate that management believes a market participant would consider in determining fair value. We estimate the timing and amount of cash flows expected to be collected at acquisition using internal models that incorporate management’s best estimate of current key assumptions, such as default rates, loss severity and payment speeds.
	Under the applicable accounting guidance for purchased impaired loans, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan using the constant effective yield method when there is a reasonable expectation about the amount and timing of such cash flows. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference. Decreases in expected cash flows subsequent to acquisition generally result in an allowance for loan losses. Subsequent increases in cash flows result in a reversal of the allowance for losses to the extent previously established or a prospective adjustment to the accretable yield. Purchased impaired loans with common risk characteristics are accounted for on a pool basis as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Because we are recognizing interest income on each pool of loans, they are all considered to be performing.
	Covered Assets – Purchased loans and foreclosed loan collateral covered under loss sharing or similar credit protection agreements with the Federal Deposit Insurance Corporation ("FDIC") are reported separately on the face of the Consolidated Statements of Financial Condition inclusive of the fair value of reimbursement cash flows the Company expects to receive from the FDIC under the agreement. The allowance for covered loan losses is determined without regard to the expected reimbursement from the FDIC with any provision for covered loan loss charges recorded in the Consolidated Statements of Income reflected net of such FDIC reimbursement.
	Other Real Estate Owned ("OREO") – OREO is comprised of property acquired through foreclosure proceedings or acceptance of a deed-in-lieu of foreclosure in partial or total satisfaction of certain loans. Properties are initially recorded at fair value less estimated selling costs. Any write-downs in the carrying value of a property at the time of acquisition are charged against the allowance for loan losses. Subsequent to initial recognition, OREO is recorded at the lower of the initial cost basis or current fair value less estimated selling costs. Any subsequent write-downs to reflect current fair value less estimated selling costs are recorded through a valuation allowance. Such write-downs, as well as gains or losses on disposition and revenues or expenses incurred in maintaining such properties and are reported in non-interest expense in the Consolidated Statements of Income.
	Depreciable Assets – Premises, leasehold improvements, furniture and equipment, and software are stated at cost less accumulated depreciation. Depreciation expense is determined by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the life of the asset or the lease term. Rates of depreciation are generally based on the following useful lives: buildings, 30-40 years; leasehold improvements, typically 1-16 years; furniture and equipment, 3-7 years; and software, 3-5 years. Gains on dispositions are included in other income, and losses on dispositions are included in other expense in the Consolidated Statements of Income. Maintenance and repairs are charged to operating expenses as incurred, while improvements that extend the useful life of assets are capitalized and depreciated over the estimated remaining life.
	Long-lived depreciable assets are evaluated periodically for impairment when events or changes in circumstances indicate the carrying amount may not be recoverable. Impairment exists when the estimated undiscounted future cash flows attributable to a long-lived asset are less than its carrying value. In that event, the Company recognizes a loss equal to the difference between the carrying amount and the estimated fair value of the asset based on a quoted market price, if applicable, or a discounted cash flow analysis. Impairment losses are recorded in other non-interest expense in the Consolidated Statements of Income.
	Bank Owned Life Insurance ("BOLI") – BOLI represents life insurance policies on the lives of certain Company officers or former officers for which the Company is the beneficiary. These policies are recorded as an asset on the Consolidated Statements of Financial Condition at their cash surrender value, or the amount that could be realized currently. The change in cash surrender value and insurance proceeds received are recorded as BOLI income in non-interest income in the Consolidated Statements of Income.
	Goodwill and Other Intangible Assets – Goodwill represents the excess of purchase price over the fair value of net assets acquired (including identifiable intangible assets) using the acquisition method of accounting. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability.
	Goodwill is allocated to reporting units at acquisition. We have determined that our operating segments represent our reporting units under U.S. GAAP, and goodwill is allocated to the Banking and Asset Management reporting units. Subsequent to initial recognition, goodwill is not amortized but, instead, is tested for impairment at the reporting unit level at least annually or more often if an event occurs or circumstances change that would indicate it is more likely than not that the fair value of a reporting unit is less than its carrying amount. We perform our annual goodwill impairment assessment as of October 31 each year. In the event we conclude that all or a portion of our goodwill is impaired, a non-cash charge for the amount of such impairment would be recorded in earnings. Such a charge would have no impact on tangible or regulatory capital.
	The goodwill impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. In "step one," the fair value of each reporting unit is compared to the recorded book value. Our step one calculation of each reporting unit’s fair value is based upon a simple average of two metrics: (1) a primary market approach, which measures fair value based upon trading multiples of independent publicly traded financial institutions of comparable size and character to the reporting units, and (2) an income approach, which estimates fair value based upon discounted cash flows and terminal value (using the perpetuity growth method). If the fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired and "step two" is not considered necessary. If the carrying value of a reporting unit exceeds its fair value, the impairment test continues ("step two") by comparing the carrying value of the reporting unit’s goodwill to the implied fair value of goodwill. The implied fair value of goodwill is determined using the residual approach, where the fair value of a reporting unit is allocated to all of the assets and liabilities of that unit as if the reporting unit had been acquired in a business combination and the fair value of the reporting unit, calculated in step one, is the price paid to acquire the reporting unit. The excess of the fair value of the reporting unit over the amounts assigned to its assets and liabilities is the implied fair value of goodwill. An impairment charge is recognized to the extent the carrying value of goodwill exceeds the implied fair value of goodwill.
	The Company has the option to perform a qualitative assessment of impairment for each reporting unit to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value before applying the existing two-step goodwill impairment test. If the Company concludes it is more likely than not, the Company would proceed with the existing two-step test, as described above. Otherwise, the Company would be able to bypass the two-step test and conclude that goodwill is not impaired from a qualitative perspective.
	Identified intangible assets that have a finite useful life are amortized over that life in a manner that reflects the estimated decline in the economic value of the identified intangible asset and are subject to impairment testing whenever events or changes in circumstances indicate that the carrying value may not be recoverable. All of the Company’s other intangible assets have finite lives and are amortized over their estimated useful lives with varying periods not exceeding 12 years.
	Fiduciary Assets and Assets Under Management – Assets held in a fiduciary capacity for clients are not included in the consolidated financial statements as they are not assets of the Company or its subsidiaries. Fiduciary and asset management fees are generally determined based upon market values of assets under management as of a specified date during the period and are included as a component of non-interest income in the Consolidated Statements of Income.
	Advertising Costs – All advertising costs are expensed in the period they are incurred.
	Loss Contingencies – Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated.
	Derivative Instruments – We utilize an overall risk management strategy that incorporates the use of derivative instruments to reduce interest rate risk, as it relates to mortgage loan commitments and planned sales of loans, and foreign currency volatility. We also use these instruments to accommodate our clients as we provide them with risk management solutions, including interest rate and foreign currency contracts. None of the aforementioned end-user and client-related derivatives are designated as hedging instruments.
	We also use interest rate derivatives to hedge variability in forecasted interest cash flows in our loan portfolio which is comprised primarily of floating-rate loans. These derivatives are designated as cash flow hedges.
	All derivative instruments are recorded at fair value on the Consolidated Statements of Financial Condition, after considering the effects of master netting agreements as allowed under authoritative accounting guidance.
	On the date we enter into a derivative contract, we designate the derivative instrument as a fair value hedge, cash flow hedge, or as a freestanding derivative instrument. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, that are attributable to a particular risk, such as interest rate risk, are considered to be fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in the cash flows of a recognized asset or liability, or of a forecasted transaction, that is attributable to a particular risk are considered to be cash flow hedges. We formally document all relationships between hedging instruments and hedged items, as well as our risk management objective and strategy for undertaking each hedge transaction at its inception.
	For derivative instruments that are designated and qualify as a fair value hedge and are effective, the gain or loss on the derivative instrument, as well as the offsetting loss or gain on the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. For derivative instruments that are designated and qualify as a cash flow hedge, the effective portion of the gain or loss on the derivative instrument is reported as a component of OCI. The unrealized gain or loss is reclassified into earnings in the same period the hedged item affects earnings. For all hedge relationships, derivative gains and losses not effective in hedging the change in fair value or expected cash flows of the hedged item are recognized immediately in current earnings during the period of change. For derivatives not designated in a hedge relationship, changes in fair value are reported in current earnings during the period of change.
	At the hedge’s inception and at least quarterly thereafter, a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in the fair values or cash flows of the hedged item and whether they are expected to be highly effective in the future. If a derivative instrument designated as a hedge is terminated or ceases to be highly effective, hedge accounting is discontinued and the gain or loss is amortized to earnings over the remaining life of the hedged asset or liability (fair value hedge) or over the same period(s) that the forecasted hedged transactions impact earnings (cash flow hedge). However, if the forecasted transaction is not probable of occurring, the gain or loss is included in earnings immediately.
	The Company classifies cash flows from derivative instruments designated in a hedge relationship in the same category as the cash flows from the items being hedged as long as the derivatives do not include an other-than-insignificant financing element.
	Income Taxes – The Company and its subsidiaries file a consolidated Federal income tax return. The provision for income taxes is based on income reported in the Consolidated Statements of Income, rather than amounts reported on our income tax return.
	We recognize a deferred tax asset or liability for the estimated future tax effects attributable to "temporary differences." Temporary differences include differences between financial statement income and tax return income that are expected to reverse in future periods, as well as differences between the financial reporting and tax bases of assets and liabilities that are also expected to be settled in future periods. Deferred tax assets and liabilities are measured using the enacted tax rates that we expect will apply when the differences are reversed or settled. Changes in corporate income tax rates, if any, would impact the pricing of our deferred tax assets and liabilities in the period of enactment, with any changes in the valuation of deferred tax assets and liabilities reflected as an adjustment to income tax expense. A valuation allowance is recorded to reduce deferred tax assets to the amount management concludes is more likely than not to be realized.
	We periodically review and evaluate the status of uncertain tax positions and may establish tax reserves for tax benefits that may not be realized. Any income tax-related interest and penalties are included in income tax expense.
	Net Earnings Per Common Share – Basic income per common share is calculated using the two-class method. The two-class method is an earnings allocation formula that determines earnings per share for each share of common stock and participating securities according to dividends declared (distributed earnings) and participation rights in undistributed earnings. Distributed and undistributed earnings are allocated between common and participating security stockholders based on their respective rights to receive dividends. Share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities (i.e., the Company’s deferred stock units and certain restricted stock and unit awards). Undistributed net losses are not allocated to holders of participating securities, as they do not have a contractual obligation to fund the losses incurred by the Company. Net income attributable to common shares is then divided by the weighted-average number of common shares outstanding during the period, net of participating securities.
	Diluted income per common share considers common stock issuable under the assumed release of unvested restricted stock awards and units and the assumed exercise of stock options granted under the Company’s stock plans ("potentially dilutive common stock equivalents"). The dilutive effect of share-based payment awards that are not deemed to be participating securities is calculated using the treasury stock method, which assumes that the proceeds from exercise are used to purchase common stock at the average market price for the period. The dilutive effect of participating securities is calculated using the more dilutive of the treasury stock method (which assumes that the participating securities are exercised/released) or the two-class method (which assumes that the participating securities are not exercised/released and earnings are reallocated between common and participating security stockholders). Potentially dilutive common stock equivalents are excluded from the computation of diluted earnings per common share in periods in which the effect would be antidilutive.
Treasury Stock – Treasury stock acquired is recorded at cost and is carried as a reduction of equity on the Consolidated Statements of Financial Condition.
Share-Based Compensation – Share-based compensation cost is recognized as expense for stock options, restricted stock awards, restricted stock units, and performance share units issued to employees and non-employee directors based on the fair value of these awards at the date of grant. A binomial option-pricing model is utilized to estimate the fair value of stock options, while the closing market price of the Company’s common stock at the date of grant is used for restricted stock awards, restricted stock units and performance share units ("full value awards"). To the extent full value awards are subject to post-vesting transferability restrictions, a discount for lack of marketability may be applied to the grant date fair value. Additionally, the grant date fair value of full value awards is adjusted to reflect any market conditions that affect vesting of the awards. The costs are recognized ratably on a straight-line basis over the requisite service period, generally defined as the vesting period for the awards. For performance share units, an estimate is made as to the number of shares expected to vest as a result of actual performance against the performance criteria to determine the amount of compensation expense to be recognized. The estimate is re-evaluated quarterly and total compensation expense is adjusted for any change in the current period. When an award is granted to an employee who is retirement eligible or who will become retirement eligible prior to the end of the service period and will continue to vest after retirement, the compensation cost of these awards is recognized over the period up to the date an employee first becomes eligible to retire. The amortization of share-based compensation generally reflects estimated forfeitures adjusted for actual forfeiture experience. As compensation expense is recognized, a deferred tax asset is recorded that represents an estimate of the future tax deduction from exercise or release of restrictions. At the time share-based awards expire, are exercised or canceled, or as restrictions are released, we may be required to recognize an adjustment to stockholders’ equity or income tax expense, depending on the market price of the Company’s stock at that time and the amount of the deferred tax asset relating to such awards. Share-based compensation expense is included in "salaries and wages" in the Consolidated Statements of Income.
Comprehensive Income – Comprehensive income consists of two components, reported net income and OCI. OCI refers to revenue, expenses, gains, and losses that are recorded as an element of equity but are excluded from reported net income. OCI consists of unrealized gains (losses) on securities available-for-sale and changes in the fair value of derivative instruments designated as cash flow hedges, net of tax.
Segment Disclosures – An operating segment is a component of a business that (i) engages in business activities from which it may earn revenues and incur expenses; (ii) has operating results that are reviewed regularly by the entity’s chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance; and (iii) has discrete financial information available. Our chief operating decision maker evaluates the operations of the Company under three operating segments: Banking, Asset Management, and Holding Company.
Variable Interest Entities – A variable interest entity ("VIE") is a partnership, limited liability company, trust, or other legal entity that does not have sufficient equity to permit it to finance its activities without additional subordinated financial support from other parties, or whose investors lack one of three characteristics associated with owning a controlling financial interest. Those characteristics are: (i) the power, through voting rights or similar rights, to direct the activities of an entity that most significantly impact the entity’s economic performance, (ii) the obligation to absorb the expected losses of the entity; and (iii) the right to receive the expected residual returns of the entity.
U.S. GAAP requires VIEs to be consolidated by the party that has a controlling financial interest in the VIE (i.e., the primary beneficiary). The Company is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE.

RECENT_ACCOUNTING_PRONOUNCEMEN

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
	Dec. 31, 2014
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS
	Recently Adopted Accounting Pronouncements
	Accounting for Investments in Qualified Affordable Housing Projects - On January 1, 2014, we adopted new accounting guidance issued by the Financial Accounting Standards Board ("FASB") related to the accounting for investments in limited liability entities that manage or invest in affordable housing projects that qualify for low-income housing tax credits. The guidance allows the Company to elect to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Additionally, the guidance requires disclosure of (1) the nature of the Company’s investments in qualified affordable housing projects and (2) the effect of the measurement of those investments and the related tax credits on the Company’s financial position and results of operations. Prior to the adoption of this new guidance, the Company previously accounted for such investments using the effective yield method. As permitted under the new guidance, the Company has elected to continue accounting for its investments in qualified affordable housing projects that existed prior to the date of adoption using the effective yield method. Any new investments in qualified affordable housing projects entered into on or after January 1, 2014 that meet certain conditions will be accounted for using the proportional amortization method. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits allocated to the Company. While the guidance affected our disclosures, adoption of the guidance did not materially impact our financial position or consolidated results of operations. Refer to Note 22 for the required disclosures.
	Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity - On July 1, 2014, we adopted new accounting guidance issued by the FASB that changes the criteria for reporting discontinued operations and requires additional disclosures about discontinued operations. Under the guidance, a discontinued operation is (1) a component of an entity that has been disposed of or is classified as held-for-sale that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results or (2) an acquired business or nonprofit activity that is classified as held-for-sale on the date of the acquisition. The guidance requires new disclosures for disposals that meet the definition of a discontinued operation, and also requires new disclosures for those disposals that are individually significant but do not meet the definition of a discontinued operation. The guidance must be applied prospectively. The adoption of this guidance did not impact our financial position or consolidated results of operations.
	Accounting Pronouncements Pending Adoption
	Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure - In August 2014, the FASB issued guidance that requires a creditor to derecognize a mortgage loan upon foreclosure and recognize a separate other receivable if the following conditions are met: (1) the loan has a government guarantee that is not separable from the loan before foreclosure, (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim, and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable is measured based on the amount of the loan balance expected to be recovered from the guarantor. The guidance will be effective for the Company’s financial statements beginning January 1, 2015. The adoption of this guidance is not expected to have a material impact on our financial position or consolidated results of operations.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans - In January 2014, the FASB issued guidance that clarifies when the Company should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The guidance indicates that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or similar legal agreement. Additionally, the guidance requires disclosure of (1) the amount of foreclosed residential real estate property held by the Company and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The guidance will be effective for the Company’s financial statements beginning January 1, 2015. The adoption of this guidance is not expected to have a material impact on our financial position or consolidated results of operations.
	Revenue from Contracts with Customers - In May 2014, the FASB issued a comprehensive new revenue recognition standard that will replace most of the existing revenue recognition guidance in U.S. GAAP. All arrangements involving the transfer of goods or services to customers are within the scope of the guidance, except for certain contracts subject to other U.S. GAAP guidance such as, including lease contracts and rights and obligations related to financial instruments. The standard’s core principle is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also includes new disclosure requirements related to the nature, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The guidance will be effective for the Company’s financial statements beginning January 1, 2017. The Company may choose to apply the new standard either retrospectively or through a cumulative effect adjustment as of January 1, 2017. The Company is in the process of determining the effect of the new guidance on our financial position and consolidated results of operations, as well as which transition method to use.
	Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures - In June 2014, the FASB issued guidance that amends the accounting for repurchase-to-maturity transactions and repurchase financings. Under the new guidance, repurchase-to-maturity transactions will be accounted for as secured borrowings. Additionally, the initial transfer and related repurchase agreement in a repurchase financing will need to be considered separately, rather than as a linked transaction. In addition, new disclosures will be required for (1) repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings, and (2) transfers accounted for as sales when the transferor also retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The guidance will be effective for the Company’s financial statements beginning January 1, 2015, except for the disclosures related to transactions accounted for as secured borrowings, which will be effective for the Company’s financial statements that include periods beginning on April 1, 2015. The adoption of this guidance is not expected to have a material impact on our financial position or consolidated results of operations.
	Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period - In June 2014, the FASB issued guidance that clarifies the accounting for a performance target that affects vesting of a share-based payment award and that could be achieved after the requisite service period. The guidance indicates that such a performance target would not be reflected in the estimation of the award’s grant date fair value. Rather, compensation cost for such an award would be recognized over the requisite service period, if it is probable that the performance target will be achieved. The total amount of compensation cost recognized during and after the requisite service period would reflect the number of awards that are expected to vest and would be adjusted to reflect those awards that ultimately vest. The guidance will be effective for the Company’s financial statements that include periods beginning January 1, 2016 and applied prospectively to awards that are granted or modified after the effective date. The adoption of this guidance is not expected to have a material impact on our financial position or consolidated results of operations.
	Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern - In August 2014, the FASB issued guidance that requires management to evaluate whether there are conditions and events that raise substantial doubt about an entity’s ability to continue as a going concern. The guidance requires new disclosures to the extent management concludes there is substantial doubt about an entity’s ability to continue as a going concern. The guidance will be effective for the Company’s annual financial statements dated December 31, 2016, as well as interim periods thereafter. The adoption of this guidance is not expected to have a material impact on our financial position or consolidated results of operations.

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
SECURITIES	SECURITIES
	Securities Portfolio
	(Amounts in thousands)
		December 31,
		2014													2013
		Amortized			Gross Unrealized							Fair			Amortized		Gross Unrealized						Fair
		Cost			Gains			Losses				Value			Cost		Gains			Losses			Value
	Securities Available-for-Sale
	U.S. Treasury	$	269,697		$	120		$	(1,552	)		$	268,265		$	145,716	$	—		$	(3,141	)	$	142,575
	U.S. Agencies	46,959			—			(701		)		46,258			47,409		—			(1,881		)	45,528
	Collateralized mortgage obligations	132,633			4,334			(34		)		136,933			169,775		6,356			(15		)	176,116
	Residential mortgage-backed securities	822,746			25,058			(1,726		)		846,078			946,656		23,627			(7,176		)	963,107
	State and municipal securities	340,810			7,222			(722		)		347,310			271,135		6,627			(3,112		)	274,650
	Foreign sovereign debt	500			—			—				500			500		—			—			500
	Total	$	1,613,345		$	36,734		$	(4,735	)		$	1,645,344		$	1,581,191	$	36,610		$	(15,325	)	$	1,602,476
	Securities Held-to-Maturity
	Collateralized mortgage obligations	$	59,960		$	—		$	(2,017	)		$	57,943		$	67,335	$	—		$	(3,263	)	$	64,072
	Residential mortgage-backed securities	885,235			9,410			(2,483		)		892,162			688,410		637			(15,274		)	673,773
	Commercial mortgage-backed securities	183,021			592			(2,176		)		181,437			164,607		6			(6,640		)	157,973
	State and municipal securities	1,069			4			—				1,073			1,084		6			—			1,090
	Total	$	1,129,285		$	10,006		$	(6,676	)		$	1,132,615		$	921,436	$	649		$	(25,177	)	$	896,908
	The carrying value of securities pledged to secure public deposits, FHLB advances, trust deposits, Federal Reserve Bank ("FRB") discount window borrowing availability, derivative transactions, standby letters of credit with counterparty banks and for other purposes as permitted or required by law, totaled $353.1 million and $401.4 million at December 31, 2014 and 2013, respectively. Of total pledged securities, securities pledged to creditors under agreements pursuant to which the collateral may be sold or re-pledged by the secured parties totaled $86.5 million and $108.1 million at December 31, 2014 and 2013, respectively.
	Excluding securities issued or backed by the U.S. Government and its agencies and U.S. Government-sponsored enterprises, there were no investments in securities from one issuer that exceeded 10% of consolidated equity at December 31, 2014 or 2013.
	The following table presents the fair values of securities with unrealized losses as of December 31, 2014 and 2013. The securities presented are grouped according to the time periods during which the securities have been in a continuous unrealized loss position.
	Securities in Unrealized Loss Position
	(Amounts in thousands)
		Less Than 12 Months						12 Months or Longer							Total
		Fair			Unrealized			Fair				Unrealized			Fair		Unrealized
		Value			Losses			Value				Losses			Value		Losses
	As of December 31, 2014
	Securities Available-for-Sale
	U.S. Treasury	$	119,233		$	(159	)	$	123,117			$	(1,393	)	$	242,350	$	(1,552	)
	U.S. Agency	—			—			46,258				(701		)	46,258		(701		)
	Collateralized mortgage obligations	4,565			(34		)	—				—			4,565		(34		)
	Residential mortgage-backed securities	—			—			89,085				(1,726		)	89,085		(1,726		)
	State and municipal securities	53,092			(249		)	32,152				(473		)	85,244		(722		)
	Total	$	176,890		$	(442	)	$	290,612			$	(4,293	)	$	467,502	$	(4,735	)
	Securities Held-to-Maturity
	Collateralized mortgage obligations	$	—		$	—		$	57,943			$	(2,017	)	$	57,943	$	(2,017	)
	Residential mortgage-backed securities	45,867			(38		)	162,564				(2,445		)	208,431		(2,483		)
	Commercial mortgage-backed securities	10,021			(28		)	105,709				(2,148		)	115,730		(2,176		)
	Total	$	55,888		$	(66	)	$	326,216			$	(6,610	)	$	382,104	$	(6,676	)
	As of December 31, 2013
	Securities Available-for-Sale
	U.S. Treasury	$	142,575		$	(3,141	)	$	—			$	—		$	142,575	$	(3,141	)
	U.S. Agency	45,528			(1,881		)	—				—			45,528		(1,881		)
	Collateralized mortgage obligations	3,409			(15		)	—				—			3,409		(15		)
	Residential mortgage-backed securities	276,657			(7,176		)	—				—			276,657		(7,176		)
	State and municipal securities	104,442			(2,812		)	10,325				(300		)	114,767		(3,112		)
	Total	$	572,611		$	(15,025	)	$	10,325			$	(300	)	$	582,936	$	(15,325	)
	Securities Held-to-Maturity
	Collateralized mortgage obligations	$	64,072		$	(3,263	)	$	—			$	—		$	64,072	$	(3,263	)
	Residential mortgage-backed securities	556,410			(14,908		)	3,327				(366		)	559,737		(15,274		)
	Commercial mortgage-backed securities	123,021			(4,674		)	25,240				(1,966		)	148,261		(6,640		)
	Total	$	743,503		$	(22,845	)	$	28,567			$	(2,332	)	$	772,070	$	(25,177	)
	There were $616.8 million of securities with $10.9 million in an unrealized loss position for greater than 12 months at December 31, 2014. At December 31, 2013, there were $38.9 million of securities with $2.6 million in an unrealized loss position greater than 12 months. The Company does not consider these unrealized losses to be credit-related. These unrealized losses relate to changes in interest rates and market spreads. We do not intend to sell the securities and we do not believe it is more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. Accordingly, no other-than-temporary impairments have been recorded on these securities during 2014 or 2013.
	The following table presents the remaining contractual maturity of securities as of December 31, 2014 by amortized cost and fair value.
	Remaining Contractual Maturity of Securities
	(Amounts in thousands)
		December 31, 2014
		Available-For-Sale Securities						Held-To-Maturity Securities
		Amortized Cost			Fair			Amortized Cost				Fair
					Value							Value
	U.S. Treasury, U.S. Agencies, state and municipal and foreign sovereign debt securities:
One year or less	$	5,586		$	5,682		$	816			$	817
One year to five years	460,131			461,243			253				256
Five years to ten years	181,139			184,042			—				—
After ten years	11,110			11,366			—				—
All other securities:
Collateralized mortgage obligations	132,633			136,933			59,960				57,943
Residential mortgage-backed securities	822,746			846,078			885,235				892,162
Commercial mortgage-backed securities	—			—			183,021				181,437
Total	$	1,613,345		$	1,645,344		$	1,129,285			$	1,132,615
The following table presents gains (losses) on securities for the three years ended December 31, 2014, 2013, and 2012.
Securities Gains (Losses)
(Amounts in thousands)
	Year Ended December 31,
	2014			2013			2012
Proceeds from sales	$	74,690		$	114,740		$	20,905
Gross realized gains	$	615		$	1,178		$	573
Gross realized losses	(85		)	(4		)	(778		)
Net realized gains (losses)	$	530		$	1,174		$	(205	)	(1)
Income tax provision (benefit) on net realized gains (losses)	$	209		$	463		$	(81	)
(1)	Includes net losses of $520,000 in 2012 associated with certain investment funds that make qualifying investments for purposes of supporting our community reinvestment initiatives in accordance with the Community Reinvestment Act ("CRA" investments). These investments are classified in other assets in the Consolidated Statements of Financial Condition. Effective in fourth quarter 2012, net losses from these investments are recorded in other non-interest expense in the Consolidated Statements of Income.
Refer to Note 13 for additional details of the securities available-for-sale portfolio and the related impact of unrealized gains (losses) on other comprehensive income.

Loans

Loans	12 Months Ended
	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
LOANS	LOANS
	The following loan portfolio and credit quality disclosures exclude covered loans. Covered loans represent loans acquired through a FDIC-assisted transaction that are subject to a loss share agreement and are presented separately in the Consolidated Statements of Financial Condition. Refer to Note 6 for a detailed discussion regarding covered loans.
	Loan Portfolio
	(Amounts in thousands)
		December 31,
		2014				2013
	Commercial and industrial	$	5,996,070			$	5,360,773
	Commercial – owner-occupied commercial real estate	1,892,564				1,695,479
	Total commercial	7,888,634				7,056,252
	Commercial real estate	2,323,616				2,062,889
	Commercial real estate – multi-family	593,103				513,194
	Total commercial real estate	2,916,719				2,576,083
	Construction	381,102				293,387
	Residential real estate	361,565				341,868
	Home equity	142,177				149,732
	Personal	202,022				226,699
	Total loans	$	11,892,219			$	10,644,021
	Net deferred loan fees and unamortized discount and premium on loans, included as a reduction in total loans	$	47,017			$	37,063
	Overdrawn demand deposits included in total loans	$	1,963			$	2,772
	We primarily lend to businesses and consumers in the market areas in which we have physical locations. We seek to diversify our loan portfolio by loan type, industry, and borrower.
	Loans Held-For-Sale
	(Amounts in thousands)
		December 31,
		2014				2013
	Mortgage loans held-for-sale (1)	$	42,215			$	17,619
	Other loans held-for-sale (2)	72,946				9,197
	Total loans held-for-sale	$	115,161			$	26,816
	(1)	Comprised of residential mortgage loan originations intended to be sold in the secondary market. The Company accounts for these loans under the fair value option. Refer to Note 20 for additional information regarding mortgage loans held-for-sale.
	(2)	Amounts at December 31, 2014 consists of $36.6 million of commercial, commercial real estate and construction loans carried at the lower of aggregate cost or fair value and $36.3 million of commercial, commercial real estate, construction, home equity and personal loans held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia, which closed in January 2015. Amounts at December 31, 2013 represent commercial loans carried at the lower of aggregate cost or fair value. Generally, the Company intends to sell these loans within 30-60 days from the date the intent to sell was established.
	Carrying Value of Loans Pledged
	(Amounts in thousands)
		December 31,
		2014				2013
	Loans pledged to secure outstanding borrowings or availability:
	FRB discount window borrowings (1)	$	478,692			$	710,269
	FHLB advances (2)	1,576,168				1,337,552
	Total	$	2,054,860			$	2,047,821
	(1)	No borrowings were outstanding at December 31, 2014 or 2013.
	(2)	Refer to Notes 10 and 11 for additional information regarding FHLB advances.
	Related Party Loans
	Some of our executive officers and directors are clients of our Bank, and some of our executive officers and directors are direct or indirect owners of 10% or more of the stock of corporations which are, or have been in the past, clients of the Bank. These loans were made in the ordinary course of business on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other unaffiliated persons and do not involve more than the normal risk of collectability. These loans totaled $9.7 million and $14.2 million at December 31, 2014 and 2013, respectively.
	Loan Portfolio Aging
	(Amounts in thousands)
						Delinquent
		Current				30 – 59			60 – 89				90 Days Past				Total				Nonaccrual				Total Loans
						Days Past Due			Days Past Due				Due and				Accruing
													Accruing				Loans
	As of December 31, 2014
	Commercial	$	7,855,833			$	762		$	992			$	—			$	7,857,587			$	31,047			$	7,888,634
	Commercial real estate	2,891,301				5,408			261				—				2,896,970				19,749				2,916,719
	Construction	380,939				163			—				—				381,102				—				381,102
	Residential real estate	354,717				943			631				—				356,291				5,274				361,565
	Home equity	128,500				397			2,236				—				131,133				11,044				142,177
	Personal	201,569				23			—				—				201,592				430				202,022
	Total loans	$	11,812,859			$	7,696		$	4,120			$	—			$	11,824,675			$	67,544			$	11,892,219
	As of December 31, 2013
	Commercial	$	7,031,318			$	2		$	153			$	—			$	7,031,473			$	24,779			$	7,056,252
	Commercial real estate	2,523,023				5,946			161				—				2,529,130				46,953				2,576,083
	Construction	293,387				—			—				—				293,387				—				293,387
	Residential real estate	330,922				674			296				—				331,892				9,976				341,868
	Home equity	136,341				1,108			404				—				137,853				11,879				149,732
	Personal	225,922				124			2				—				226,048				651				226,699
	Total loans	$	10,540,913			$	7,854		$	1,016			$	—			$	10,549,783			$	94,238			$	10,644,021
	Impaired Loans
Impaired loans consist of nonaccrual loans (which include nonaccrual TDRs) and loans classified as accruing TDRs. A loan is considered impaired when, based on current information and events, either (i) management believes that it is probable that we will be unable to collect all amounts due (both principal and interest) according to the original contractual terms of the loan agreement, or (ii) it has been classified as a TDR.
The following two tables present our recorded investment in impaired loans outstanding by product segment, including our recorded investment in impaired loans, which represents the principal amount outstanding, net of unearned income, deferred loan fees and costs, and any direct principal charge-offs.
Impaired Loans
(Amounts in thousands)
	Unpaid				Recorded			Recorded				Total				Specific
	Contractual				Investment			Investment				Recorded				Reserve
	Principal				With No			With				Investment
	Balance				Specific			Specific
					Reserve			Reserve
As of December 31, 2014
Commercial	$	60,174			$	25,739		$	26,432			$	52,171			$	11,487
Commercial real estate	26,738				9,755			10,193				19,948				2,441
Residential real estate	5,849				349			4,925				5,274				735
Home equity	12,904				3,627			8,839				12,466				1,855
Personal	430				—			430				430				109
Total impaired loans	$	106,095			$	39,470		$	50,819			$	90,289			$	16,627
As of December 31, 2013
Commercial	$	44,471			$	30,039		$	11,774			$	41,813			$	4,895
Commercial real estate	61,112				10,301			38,203				48,504				12,536
Residential real estate	11,823				2,629			7,347				9,976				2,412
Home equity	13,893				2,567			10,903				13,470				2,386
Personal	651				—			651				651				148
Total impaired loans	$	131,950			$	45,536		$	68,878			$	114,414			$	22,377
Average Recorded Investment and Interest Income Recognized on Impaired Loans (1)
(Amounts in thousands)
	2014							2013
	Average Recorded Investment				Interest Income			Average Recorded Investment				Interest Income Recognized
					Recognized
Commercial	$	51,030			$	1,441		$	72,050			$	2,265
Commercial real estate	32,256				67			64,887				428
Residential real estate	9,281				—			11,354				3
Home equity	12,592				88			14,665				120
Personal	582				—			2,784				—
Total	$	105,741			$	1,596		$	165,740			$	2,816
(1)	Represents amounts while classified as impaired for the periods presented.
Credit Quality Indicators
We have adopted an internal risk rating policy in which each loan is rated for credit quality with a numerical rating of 1 through 8. Loans rated 5 and better (1-5 ratings, inclusive) are credits that we believe exhibit acceptable financial performance, cash flow, and leverage. We attempt to mitigate risk through loan structure, collateral, monitoring, and other credit risk management controls. Credits rated 6 are performing in accordance with contractual terms but are considered "special mention" as these credits demonstrate potential weakness that if left unresolved, may result in deterioration in our credit position and/or the repayment prospects for the credit. Borrowers rated special mention may exhibit adverse operating trends, high leverage, tight liquidity or other credit concerns. Loans rated 7 may be classified as either accruing ("potential problem") or nonaccrual ("nonperforming"). Potential problem loans, like special mention, are loans that are performing in accordance with contractual terms, but for which management has some level of concern (greater than that of special mention loans) about the ability of the borrowers to meet existing repayment terms in future periods. These loans continue to accrue interest but the ultimate collection of these loans in full is questionable due to the same conditions that characterize a 6-rated credit. These credits may also have somewhat increased risk profiles as a result of the current net worth and/or paying capacity of the obligor or guarantors or the value of the collateral pledged. These loans generally have a well-defined weakness that may jeopardize collection of the debt and are characterized by the distinct possibility that we may sustain some loss if the deficiencies are not resolved. Although these loans are generally identified as potential problem loans and require additional attention by management, they may never become nonperforming. Nonperforming loans include nonaccrual loans risk rated 7 or 8 and have all the weaknesses inherent in a 7-rated potential problem loan with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently-existing facts, conditions and values, highly questionable and improbable. Special mention, potential problem and nonperforming loans are reviewed at a minimum on a quarterly basis, while all other rated credits over a certain dollar threshold, depending on loan type, are reviewed annually or more frequently as the circumstances warrant.
Credit Quality Indicators
(Dollars in thousands)
		Special Mention				% of Portfolio Loan		Potential Problem				% of Portfolio Loan			Non-Performing Loans				% of Portfolio Loan			Total Loans
						Type		Loans				Type							Type
As of December 31, 2014
Commercial		$	93,130			1.2		$	78,562			1			$	31,047			0.4			$	7,888,634
Commercial real estate		3,552				0.1		746				*			19,749				0.7			2,916,719
Construction		—				—		—				—			—				—			381,102
Residential real estate		2,964				0.8		5,981				1.7			5,274				1.5			361,565
Home equity		1,170				0.8		2,108				1.5			11,044				7.8			142,177
Personal		173				0.1		45				*			430				0.2			202,022
Total		$	100,989			0.8		$	87,442			0.7			$	67,544			0.6			$	11,892,219
As of December 31, 2013
Commercial		$	62,272			0.9		$	87,391			1.2			$	24,779			0.4			$	7,056,252
Commercial real estate		1,016				*		4,489				0.2			46,953				1.8			2,576,083
Construction		—				—		—				—			—				—			293,387
Residential real estate		4,898				1.4		7,177				2.1			9,976				2.9			341,868
Home equity		2,884				1.9		2,538				1.7			11,879				7.9			149,732
Personal		187				0.1		177				0.1			651				0.3			226,699
Total		$	71,257			0.7		$	101,772			1			$	94,238			0.9			$	10,644,021
*	Less than 0.1%
Troubled Debt Restructured Loans
Troubled Debt Restructured Loans Outstanding
(Amounts in thousands)
	December 31,
	2014							2013
	Accruing				Nonaccrual (1)			Accruing				Nonaccrual (1)
Commercial	$	21,124			$	20,113		$	17,635			$	6,188
Commercial real estate	199				8,005			950				19,309
Residential real estate	—				1,881			—				2,239
Home equity	1,422				5,886			1,591				3,805
Personal	—				413			—				641
Total	$	22,745			$	36,298		$	20,176			$	32,182
(1)	Included in nonperforming loans.
At December 31, 2014 and 2013, credit commitments to lend additional funds to debtors whose loan terms have been modified in a TDR (both accruing and nonaccruing) totaled $8.5 million and $5.5 million, respectively.
Additions to Accruing Troubled Debt Restructurings During the Year
(Dollars in thousands)
	Year Ended December 31, 2014										Year Ended December 31, 2013
	Number of Borrowers			Recorded Investment (1)							Number of Borrowers			Recorded Investment (1)
				Pre-Modification			Post-Modification							Pre-Modification				Post-Modification
Commercial
Extension of maturity date (2)	4			$	20,725		$	20,725			6			$	7,288			$	7,288
Other concession (3)	5			21,289			21,289				—			—				—
Total commercial	9			42,014			42,014				6			7,288				7,288
Commercial real estate
Extension of maturity date (2)	1			202			202				1			244				244
Other concession (3)	1			426			426				1			717				717
Total commercial real estate	2			628			628				2			961				961
Residential real estate
Extension of maturity date (2)	—			—			—				1			150				150
Total accruing	11			$	42,642		$	42,642			9			$	8,399			$	8,399
(1)	Represents amounts as of the date immediately prior to and immediately after the modification is effective.
(2)	Extension of maturity date also includes loans renewed at existing rate of interest which is considered a below market rate for that particular loan’s risk profile.
(3)	Other concessions primarily include interest rate reductions, loan increases or deferrals of principal.
Additions to Nonaccrual Troubled Debt Restructurings During the Year
(Dollars in thousands)
	Year Ended December 31, 2014										Year Ended December 31, 2013
	Number of Borrowers			Recorded Investment (1)							Number of Borrowers			Recorded Investment (1)
				Pre-Modification			Post-Modification							Pre-Modification				Post-Modification
Commercial
Extension of maturity date (2)	—			$	—		$	—			2			$	334			$	334
Other concession (3)	10			17,900			17,822				6			1,795				1,795
Total commercial	10			17,900			17,822				8			2,129				2,129
Commercial real estate
Extension of maturity date (2)	—			—			—				1			297				297
Other concession (3)	3			2,057			2,070				10			18,562				7,475
Total commercial real estate	3			2,057			2,070				11			18,859				7,772
Residential real estate
Other concession (3)	5			961			1,034				1			342				342
Home equity
Extension of maturity date (2)	1			114			114				5			824				824
Other concession (3)	8			2,780			2,793				8			1,760				1,753
Total home equity	9			2,894			2,907				13			2,584				2,577
Personal
Other concession (3)	—			—			—				2			478				478
Total nonaccrual	27			$	23,812		$	23,833			35			$	24,392			$	13,298
Change in recorded investment due to net (advances) principal paydowns at time of modification							$	(21	)									$	7,916
Change in recorded investment due to charge-offs at time of modification							$	—										$	3,398
(1)	Represents amounts as of the date immediately prior to and immediately after the modification is effective.
(2)	Extension of maturity date also includes loans renewed at existing rate of interest which is considered a below market rate for that particular loan’s risk profile.
(3)	Other concessions primarily include interest rate reductions, loan increases or deferrals of principal.
At the time an accruing loan becomes modified and meets the definition of a TDR, it is considered impaired and no longer included as part of the general loan loss reserve calculation. However, our general reserve methodology considers the amount and product type of the TDRs removed as a proxy for potentially heightened risk in the portfolio when establishing final reserve requirements.
As impaired loans, TDRs (both accruing and nonaccruing) are evaluated for impairment at the end of each quarter with a specific valuation reserve created, or adjusted (either individually or as part of a pool), if necessary, as a component of the allowance for loan losses. Refer to the "Impaired Loan" and "Allowance for Loan Loss" sections of Note 1 regarding our policy for assessing potential impairment on such loans. Our allowance for loan losses included $10.6 million and $8.6 million in specific reserves for nonaccrual TDRs at December 31, 2014 and 2013, respectively. For accruing TDRs, there were no specific reserves at December 31, 2014 and $37,000 at December 31, 2013, with the specific reserve representing the difference between the present value of cash flows for the restructured loan as compared to the recorded investment in the loan.
The following table presents the recorded investment and number of loans modified as an accruing TDR during the previous 12 months which subsequently became nonperforming during the years ended December 31, 2014 and 2013. A loan becomes nonperforming and placed on nonaccrual status typically when the principal or interest payments are 90 days past due based on contractual terms or when an individual analysis of a borrower’s creditworthiness indicates a loan should be placed on nonaccrual status earlier than when the loan becomes 90 days past due.
Accruing Troubled Debt Restructurings
Reclassified as Nonperforming Within 12 Months of Restructuring
(Dollars in thousands)
	Year Ended December 31,
	2014						2013
	Number of			Recorded			Number of			Recorded
	Borrowers			Investment (1)			Borrowers			Investment (1)
Commercial	—			$	—		1			$	149
Commercial real estate	1			699			2			5,258
Residential real estate	2			57			—			—
Total	3			$	756		3			$	5,407
(1)	Represents amounts as of the balance sheet date from the quarter the default was first reported.

ALLOWANCE_FOR_LOAN_LOSSES_AND_

ALLOWANCE FOR LOAN LOSSES AND RESERVE FOR UNFUNDED COMMITMENTS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
ALLOWANCE FOR LOAN LOSSES AND RESERVE FOR UNFUNDED COMMITMENTS	ALLOWANCE FOR LOAN LOSSES AND RESERVE FOR UNFUNDED COMMITMENTS
	The following allowance and credit quality disclosures exclude covered loans. Refer to Note 6 for a detailed discussion regarding covered loans.
	Allowance for Loan Losses and Recorded Investment in Loans
	(Amounts in thousands)
		Year Ended December 31, 2014
		Commercial			Commercial			Construction			Residential			Home			Personal			Total
					Real						Real			Equity
					Estate						Estate
	Allowance for Loan Losses:
	Balance at beginning of year	$	80,768		$	42,362		$	3,338		$	7,555		$	5,648		$	3,438		$	143,109
	Loans charged-off	(5,588		)	(6,214		)	(6		)	(1,514		)	(1,017		)	(158		)	(14,497		)
	Recoveries on loans previously charged-off	6,340			2,674			79			675			228			721			10,717
	Net recoveries (charge-offs)	752			(3,540		)	73			(839		)	(789		)	563			(3,780		)
	Provision (release) for loan losses	21,942			(6,984		)	879			(1,400		)	65			(1,333		)	13,169
	Balance at end of year	$	103,462		$	31,838		$	4,290		$	5,316		$	4,924		$	2,668		$	152,498
	Ending balance, loans individually evaluated for impairment (1)	$	11,487		$	2,441		$	—		$	735		$	1,855		$	109		$	16,627
	Ending balance, loans collectively evaluated for impairment	$	91,975		$	29,397		$	4,290		$	4,581		$	3,069		$	2,559		$	135,871
	Recorded Investment in Loans:
	Ending balance, loans individually evaluated for impairment (1)	$	52,171		$	19,948		$	—		$	5,274		$	12,466		$	430		$	90,289
	Ending balance, loans collectively evaluated for impairment	7,836,463			2,896,771			381,102			356,291			129,711			201,592			11,801,930
	Total recorded investment in loans	$	7,888,634		$	2,916,719		$	381,102		$	361,565		$	142,177		$	202,022		$	11,892,219
	(1)	Refer to Notes 1 and 4 for additional information regarding impaired loans.
	Allowance for Loan Losses and Recorded Investment in Loans (Continued)
	(Amounts in thousands)
		Year Ended December 31, 2013
		Commercial			Commercial Real Estate			Construction			Residential			Home			Personal			Total
											Real			Equity
											Estate
	Allowance for Loan Losses:
	Balance at beginning of year	$	63,709		$	73,150		$	2,434		$	9,696		$	6,797		$	5,631		$	161,417
	Loans charged-off	(22,339		)	(25,294		)	70			(3,501		)	(3,445		)	(3,725		)	(58,234		)
	Recoveries on loans previously charged-off	5,054			2,173			48			15			475			997			8,762
	Net (charge-offs) recoveries	(17,285		)	(23,121		)	118			(3,486		)	(2,970		)	(2,728		)	(49,472		)
	Provision (release) for loan losses	34,344			(7,667		)	786			1,345			1,821			535			31,164
	Balance at end of year	$	80,768		$	42,362		$	3,338		$	7,555		$	5,648		$	3,438		$	143,109
	Ending balance, loans individually evaluated for impairment (1)	$	4,895		$	12,536		$	—		$	2,412		$	2,386		$	148		$	22,377
	Ending balance, loans collectively evaluated for impairment	$	75,873		$	29,826		$	3,338		$	5,143		$	3,262		$	3,290		$	120,732
	Recorded Investment in Loans:
	Ending balance, loans individually evaluated for impairment (1)	$	41,813		$	48,504		$	—		$	9,976		$	13,470		$	651		$	114,414
	Ending balance, loans collectively evaluated for impairment	7,014,439			2,527,579			293,387			331,892			136,262			226,048			10,529,607
	Total recorded investment in loans	$	7,056,252		$	2,576,083		$	293,387		$	341,868		$	149,732		$	226,699		$	10,644,021
	(1)	Refer to Notes 1 and 4 for additional information regarding impaired loans.
	Allowance for Loan Losses and Recorded Investment in Loans (Continued)
	(Amounts in thousands)
		Year Ended December 31, 2012
		Commercial			Commercial Real Estate			Construction			Residential			Home			Personal			Total
											Real			Equity
											Estate
	Allowance for Loan Losses:
	Balance at beginning of year	$	60,663		$	94,905		$	12,852		$	6,376		$	4,022		$	12,776		$	191,594
	Loans charged-off	(31,768		)	(68,099		)	(1,979		)	(3,010		)	(3,128		)	(10,044		)	(118,028		)
	Recoveries on loans previously charged-off	4,179			8,709			2,315			126			509			1,137			16,975
	Net (charge-offs) recoveries	(27,589		)	(59,390		)	336			(2,884		)	(2,619		)	(8,907		)	(101,053		)
	Provision (release) for loan losses	30,635			37,635			(10,754		)	6,204			5,394			1,762			70,876
	Balance at end of year	$	63,709		$	73,150		$	2,434		$	9,696		$	6,797		$	5,631		$	161,417
	Ending balance, loans individually evaluated for impairment (1)	$	13,259		$	20,450		$	117		$	3,996		$	2,797		$	2,771		$	43,390
	Ending balance, loans collectively evaluated for impairment	$	50,450		$	52,700		$	2,317		$	5,700		$	4,000		$	2,860		$	118,027
	Recorded Investment in Loans:
	Ending balance, loans individually evaluated for impairment (1)	$	86,180		$	83,312		$	557		$	11,689		$	13,200		$	4,822		$	199,760
	Ending balance, loans collectively evaluated for impairment	6,410,388			2,592,589			189,939			361,891			154,560			230,855			9,940,222
	Total recorded investment in loans	$	6,496,568		$	2,675,901		$	190,496		$	373,580		$	167,760		$	235,677		$	10,139,982
	-1	Refer to Notes 1 and 4 for additional information regarding impaired loans.
	Reserve for Unfunded Commitments (1)
	(Amounts in thousands)
	Year Ended December 31,
	2014			2013			2012
Balance at beginning of year	$	9,206		$	7,343		$	7,277
Provision for unfunded commitments	3,152			1,863			66
Charge-off of unfunded commitments	(84		)	—			—
Balance at end of year	$	12,274		$	9,206		$	7,343
Unfunded commitments, excluding covered assets, at year end	$	6,265,506		$	5,028,268		$	4,707,373
(1)	Unfunded commitments include commitments to extend credit, standby letters of credit and commercial letters of credit. Unfunded commitments related to covered assets are excluded as they are covered under a loss sharing agreement with the FDIC.
Refer to Note 19 for additional details of commitments to extend credit, standby letters of credit and commercial letters of credit.

COVERED_ASSETS

COVERED ASSETS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
COVERED ASSETS	COVERED ASSETS
	Covered assets represent acquired loans and foreclosed loan collateral covered under a loss sharing agreement with the FDIC and include an indemnification receivable representing the present value of the expected reimbursement from the FDIC related to expected losses on the acquired loans and foreclosed real estate under such agreement. The loss share agreement expired on September 30, 2014 for non-residential mortgage loans and related assets. At the time of expiration $28.7 million of covered loans were transferred into our held for investment loan portfolio and $719,000 of covered OREO was transferred into the OREO portfolio. The loss share agreement will expire on September 30, 2019 for residential mortgage loans and related assets.
	The carrying amount of covered assets is presented in the following table.
	Covered Assets
	(Amounts in thousands)
		December 31,
		2014								2013
		Purchased			Other		Total			Purchased			Other		Total
		Loans (1)			Assets					Loans (1)			Assets
	Commercial loans	$	—		$	—	$	—		$	11,562		$	—	$	11,562
	Commercial real estate loans	—			—		—			46,657			—		46,657
	Residential mortgage loans	32,182			—		32,182			36,883			—		36,883
	Consumer installment and other	—			—		—			3,213			259		3,472
	Foreclosed real estate	—			187		187			—			7,880		7,880
	Estimated loss reimbursement by the FDIC	—			1,763		1,763			—			6,292		6,292
	Total covered assets	32,182			1,950		34,132			98,315			14,431		112,746
	Allowance for covered loan losses	(5,191		)	—		(5,191		)	(16,511		)	—		(16,511		)
	Net covered assets	$	26,991		$	1,950	$	28,941		$	81,804		$	14,431	$	96,235
	Nonperforming covered loans (2)	$	6,828							$	15,610
	(1)	Purchased loans include $420,000 and $7.6 million of purchased impaired loans as of December 31, 2014 and 2013, respectively.
	(2)	Excludes purchased impaired loans which are accounted for on a pool basis based on common risk characteristics as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Because we are recognizing interest income on each pool of loans, all purchased impaired loans are considered to be performing.

GOODWILL_AND_OTHER_INTANGIBLE_

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS
	Changes in the Carrying Amount of Goodwill by Reporting Unit
	(Amounts in thousands)
		Banking		Asset Management			Holding Company Activities		Consolidated
	Balance at December 31, 2012	$	81,755	$	12,766		$	—	$	94,521
	Sale of Lodestar	—		(226		)	—		(226		)
	Tax benefit adjustment	—		(254		)	—		(254		)
	Balance at December 31, 2013	81,755		12,286			—		94,041
	Tax benefit adjustment	—		—			—		—
	Balance at December 31, 2014	$	81,755	$	12,286		$	—	$	94,041
	In connection with the sale of Lodestar Investment Counsel, LLC ("Lodestar") on December 31, 2013, an investment management firm and previously a wholly-owned subsidiary of the Company, $226,000 of the goodwill assigned to the Asset Management reporting unit was allocated to Lodestar and written off. A goodwill impairment charge of $146,000 was recorded in connection with the sale. Goodwill also decreased $254,000 due to an adjustment for tax benefits associated with the goodwill attributable to Lodestar.
	For our annual goodwill impairment test performed as of October 31, 2014, as permitted under current accounting guidance, we elected to not perform a qualitative assessment and instead chose to proceed with the quantitative two-step test. As a result of our step one analysis, we determined that the fair value of both the Banking and Asset management reporting units exceeded their respective carrying amounts. As such, both of our reporting units with allocated goodwill "passed" step one of the goodwill impairment test, and no further analysis was required to support the conclusion that goodwill was not impaired as of October 31, 2014. The Banking reporting unit's fair value exceeded its carrying amount by approximately 97%, while the Asset Management reporting unit's fair value exceeded its carrying amount by approximately 250%.
	The fair value of the reporting units as determined in our annual goodwill impairment test resulted in an implied control premium in excess of our market capitalization of approximately 15%. We believe this control premium is reasonable and supports the appropriate estimation of the reporting units' fair value as compared to our market capitalization.
	We are not aware of any events or circumstances subsequent to our annual goodwill impairment testing date of October 31, 2014 that would indicate impairment of goodwill allocated to the Banking and Asset Management reporting units at December 31, 2014. There were no impairment charges for goodwill allocated to the Banking and Asset Management (excluding Lodestar) reporting units recorded in 2013 or 2012.
	We have other intangible assets capitalized on the Consolidated Statements of Financial Condition in the form of core deposit premiums and client relationships. These intangible assets are being amortized over their estimated useful lives, which range from 8 to 12 years.
	We review intangible assets for possible impairment whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. In connection with the sale of Lodestar on December 31, 2013, we reduced the client relationships intangibles net carrying amount by $815,000. During 2014, there were no events or circumstances that we believe indicate there may be impairment of intangible assets, and no impairment charges for other intangible assets were recorded in 2014, 2013, or 2012.
	Other Intangible Assets
	(Amounts in thousands)
		Year Ended December 31,
		2014		2013			2012
	Core deposit intangible:
	Gross carrying amount	$	18,093	$	18,093		$	18,093
	Accumulated amortization	12,870		10,071			7,362
	Net carrying amount	$	5,223	$	8,022		$	10,731
	Amortization during the period	$	2,799	$	2,709		$	2,282
	Weighted-average remaining life (in years)	2		3			4
	Client relationships:
	Gross carrying amount	$	2,002	$	2,002		$	5,059
	Accumulated amortization	1,340		1,132			2,962
	Net carrying amount	$	662	$	870		$	2,097
	Amortization during the period	$	208	$	412		$	402
	Weighted-average remaining life (in years)	6		7			7
	Scheduled Amortization of Other Intangible Assets
	(Amounts in thousands)
		Total
	Year Ended December 31,
	2015	$	2,455
	2016	2,161
	2017	1,125
	2018	98
	2019	28
	2020 and thereafter	18
	Total	$	5,885

Premises_Furniture_And_Equipme

Premises, Furniture, And Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises, Furniture, And Equipment	PREMISES, FURNITURE, AND EQUIPMENT
	Premises, Furniture, and Equipment
	(Amounts in thousands)
		December 31,
		2014			2013
	Land	$	1,874		$	1,874
	Building	9,980			7,581
	Leasehold improvements	37,796			39,644
	Furniture and equipment	45,346			42,044
	Software	16,363			14,421
	Total cost	111,359			105,564
	Accumulated depreciation	(72,216		)	(65,860		)
	Net book value	$	39,143		$	39,704
	Depreciation expense on premises, furniture, and equipment totaled $8.7 million in 2014, $8.5 million in 2013, and $9.3 million in 2012.
	At December 31, 2014, we were obligated under certain non-cancellable operating leases for premises and equipment, which expire at various dates through the year 2023. Many of these leases contain renewal options, and certain leases provide a right of refusal to purchase the leased property during the lease term. Some leases contain escalation clauses calling for rentals to be adjusted for increased real estate taxes and other operating expenses, or proportionately adjusted for increases in the consumer price index. The following summary reflects the future minimum rental payments, by year, required under operating leases that, as of December 31, 2014, have initial or remaining non-cancellable lease terms in excess of one year.
	Operating Leases (1)
	(Amounts in thousands)
		Total
	Year Ended December 31,
	2015	$	12,794
	2016	11,376
	2017	10,926
	2018	10,632
	2019	9,974
	2020 and thereafter	32,942
	Total minimum lease payments	$	88,644
	(1)	Minimum payments have not been reduced by minimum sublease rentals of $2.0 million due in the future under non-cancellable subleases.
		Year Ended December 31,
		2014			2013			2012
	Rental expense charged to operations (1)(2)	$	12,066		$	12,224		$	12,128
	Rental income from premises leased to others (2)	$	704		$	659		$	676
	(1)	Including amounts paid under short-term cancellable leases.
	(2)	Does not include rental expense or sublease rental income for certain restructured leases.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	DEPOSITS
	Summary of Deposits
	(Amounts in thousands)
		December 31,
		2014 (1)		2013
	Noninterest-bearing deposits	$	3,516,695	$	3,172,676
	Interest-bearing deposits	1,907,320		1,470,856
	Savings deposits	319,100		284,482
	Money market accounts	4,851,925		4,515,079
	Time deposits less than $100,000	296,899		346,812
	Time deposits of $100,000 or more	2,198,029		2,223,736
	Total deposits	$	13,089,968	$	12,013,641
	(1)	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.
	Maturities of Time Deposits of $100,000 or More (1)
	(Amounts in thousands)
		2014
	Maturing within 3 months	$	466,612
	After 3 but within 6 months	398,345
	After 6 but within 12 months	748,917
	After 12 months	584,155
	Total	$	2,198,029
	(1)	Excludes time deposits held-for-sale of $32.2 million as of December 31, 2014.

SHORTTERM_AND_SECURED_BORROWIN

SHORT-TERM AND SECURED BORROWINGS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
SHORT-TERM BORROWINGS	SHORT-TERM AND SECURED BORROWINGS
	Summary of Short-Term Borrowings
	(Dollars in thousands)
		31-Dec-14				December 31, 2013
		Amount		Rate		Amount		Rate
	Outstanding:
	FHLB advances	$	428,000	0.13	%	$	2,000	3.37	%
	Other Information:
	Weighted-average remaining maturity of FHLB advances at year end	7 months				12 months
	Unused FHLB advances availability	$	265,529			$	395,302
	Unused overnight federal funds availability (1)	$	630,500			$	520,000
	Borrowing capacity through the FRB discount window primary credit program (2)	$	403,752			$	621,855
	(1)	Our total availability of overnight fed fund borrowings is not a committed line of credit and is dependent upon lender availability.
	(2)	Our borrowing capacity changes each quarter subject to available collateral and FRB discount factors.
	FHLB Advances - At December 31, 2014, FHLB advances consisted of $8.0 million from the FHLB Atlanta, of which $3.0 million is included in short-term borrowings, and $470.0 million from FHLB Chicago, of which $425.0 million is included in short-term borrowings. As a member of the FHLB Chicago, the Bank has access to a borrowing capacity which is subject to change based on the availability of acceptable collateral to pledge and the level of our investment in FHLB Chicago stock. At December 31, 2014, our borrowing capacity was $735.9 million of which $265.5 million is available, subject to the additional investment in FHLB Chicago stock required. Qualifying residential, multi-family and commercial real estate loans, home equity lines of credit, and residential mortgage-backed securities are pledged as collateral to secure current outstanding balances and additional borrowing availability. FHLB advances reported as short-term borrowings represent advances with a remaining maturity of one year or less at December 31, 2014 and 2013.
	Revolving Line of Credit - During the third quarter 2014, the Company amended its $60.0 million 364-day Revolving Line of Credit (the "Facility") with a group of commercial banks resulting in a new maturity date of September 25, 2015. Any amounts outstanding under the Facility upon maturity may be converted, at the Company's option, to an amortizing term loan, with the balance of such loan due September 26, 2017. Loans under the Facility bear interest, at the Company's election, either at a floating rate equal to LIBOR plus 1.95%, or a defined base rate minus 0.50%. At December 31, 2014, no amounts have been drawn on the Facility.
	Secured Borrowings - Also included in short-term and secured borrowings on the Consolidated Statements of Financial Condition are amounts related to certain loan participation agreements on loans we originated that were classified as secured borrowings because they did not qualify for sale accounting treatment. As of December 31, 2014 and 2013, these loan participation agreements totaled $4.4 million and $6.4 million, respectively. A corresponding amount was recorded within loans on the Consolidated Statements of Financial Condition at each of these dates.

LONGTERM_DEBT

LONG-TERM DEBT	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT
	Long-Term Debt
	(Dollars in thousands)
							December 31,
							2014				2013
	Parent Company:
	2.89% junior subordinated debentures due 2034			(1)(a)			$	8,248			$	8,248
	1.95% junior subordinated debentures due 2035			(2)(a)			51,547				51,547
	1.74% junior subordinated debentures due 2035			(3)(a)			41,238				41,238
	10.00% junior subordinated debentures due 2068				(a)		68,755				143,760
	7.125% subordinated debentures due 2042	(b)					125,000				125,000
	Subtotal						294,788				369,793
	Subsidiaries:
	FHLB advances						50,000				258,000
	Total long-term debt						$	344,788			$	627,793
	(1)	Variable rate in effect at December 31, 2014, based on three-month LIBOR +2.65%.
	(2)	Variable rate in effect at December 31, 2014, based on three-month LIBOR +1.71%.
	(3)	Variable rate in effect at December 31, 2014, based on three-month LIBOR +1.50%.
	(a)	Under the final regulatory capital rules issued in July 2013, these instruments are grandfathered for inclusion as a component of Tier 1 capital, although the Tier 1 capital treatment for these instruments will be subject to phase-out due to certain acquisitions.
	(b)	Qualifies as Tier 2 capital for regulatory capital purposes.
	The junior subordinated debentures presented in the table above were issued to four separate wholly-owned trusts for the purpose of issuing Company-obligated mandatorily redeemable trust preferred securities. On October 8, 2014, we redeemed $75.0 million of the $143.8 million outstanding 10% junior subordinated debentures due 2068 (the "10% Debentures"). The redemption price was the liquidation amount of $25 per trust preferred security. Refer to Note 12 for further information on the nature and terms of these and previously issued debentures.
	At December 31, 2014, outstanding long-term FHLB advances were secured by qualifying residential, multi-family, commercial real estate, and home equity lines of credit. From time to time we may pledge eligible real estate backed securities to support additional borrowings.
	Maturity and Rate Schedule for FHLB Long-Term Advances
	(Amounts in thousands)
		December 31,							December 31,
		2014							2013
		Amount				Rate %			Amount				Rate %
	Maturity Date:
	24-Jun-15	$	—			—	%		$	1,000			3.71	%
	21-Dec-15	—				—	%		2,000				4.22	%
	December 31, 2015	—				—	%		250,000				0.09	%
	March 25, 2019	2,000				4.26	%		2,000				4.26	%
	May 22, 2019	3,000				4.68	%		3,000				4.68	%
	September 12, 2019 (1)	15,000				3.72	%		—				—	%
	September 26, 2019 (1)	15,000				3.69	%		—				—	%
	December 9, 2019 (2)	15,000				3.58	%		—				—	%
	Total	$	50,000			3.75	%		$	258,000			0.22	%
	(1)	Provides for a one-time option to increase the advances in September 2016, up to $150.0 million each at the same fixed rate as the original advance. The advances include prepayment features and are subject to a prepayment fee.
	(2)	Provides for a one-time option to increase the advances in December 2016, up to $150.0 million each at the same fixed rate as the original advance. The advances include prepayment features and are subject to a prepayment fee.
	We reclassify long-term debt to short-term borrowings when the remaining maturity becomes less than one year.
	Scheduled Maturities of Long-Term Debt
	(Amounts in thousands)
		Total
	Year Ended December 31,
	2019	50,000
	2020 and thereafter	294,788
	Total	$	344,788

JUNIOR_SUBORDINATED_DEFERRABLE

JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES HELD BY TRUSTS THAT ISSUED GUARANTEED CAPITAL DEBT SECURITIES	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES HELD BY TRUSTS THAT ISSUED GUARANTEED CAPITAL DEBT SECURITIES	JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES HELD BY TRUSTS THAT ISSUED GUARANTEED CAPITAL DEBT SECURITIES
	As of December 31, 2014, we sponsored and wholly owned 100% of the common equity of four trusts that were formed for the purpose of issuing Company obligated mandatorily redeemable trust preferred securities ("Trust Preferred Securities") to third-party investors and investing the proceeds from the sale of the Trust Preferred Securities solely in a series of junior subordinated debentures of the Company ("Debentures"). The Debentures held by the trusts, which in aggregate totaled $169.8 million at December 31, 2014, are the sole assets of each respective trust. Our obligations under the Debentures and related documents, including the indentures, the declarations of trust and related Company guarantees, taken together, constitute a full and unconditional guarantee by the Company on a subordinated basis of distributions and redemption payments and liquidation payments on the Trust Preferred Securities. We currently have the right to redeem, in whole or in part, subject to any required regulatory approval, all or any series of the Debentures, in each case, at a redemption price of 100% of the principal amount of the Debentures being redeemed plus any accrued but unpaid interest to the redemption date. The repayment, redemption or repurchase of any of the Debentures would be subject to the terms of the applicable indenture and would result in a corresponding repayment, redemption or repurchase of an equivalent amount of the related series of Trust Preferred Securities. Any redemption of the 10% Debentures held by the PrivateBancorp Capital Trust IV ("Capital Trust IV""), would be subject to the terms of the replacement capital covenant described below and any required regulatory approval.
	In connection with the issuance in 2008 of the 10% Debentures, which rank junior to the other Debentures, we entered into a replacement capital covenant that relates to redemption of the 10% Debentures and the related Trust Preferred Securities. Under the replacement capital covenant, as amended in October 2012, we committed, for the benefit of certain debt holders, that we would not repay, redeem or repurchase the 10% Debentures or the related Trust Preferred Securities prior to June 2048 unless we have (1) obtained any required regulatory approval, and (2) raised certain amounts of qualifying equity or equity-like replacement capital at any time after October 10, 2012. The replacement capital covenant benefits holders of our "covered debt" as specified under the terms of the replacement capital covenant. Currently, under the replacement capital covenant, the "covered debt" is the Debentures held by PrivateBancorp Statutory Trust II. In the event that the Company's 7.125% subordinated debentures due 2042 are designated as or become the covered debt under the replacement capital covenant, the terms of such debentures provide that the Company is authorized to terminate the replacement capital covenant without any further action or payment. We may amend or terminate the replacement capital covenant in certain circumstances without the consent of the holders of the covered debt.
	Subsequent to October 10, 2012, the Company raised the required qualifying capital and upon receipt of regulatory approval in September 2014, Capital Trust IV redeemed $75.0 million of the $143.8 million outstanding 10% Trust Preferred Securities on October 8, 2014. The redemption of the Trust Preferred Securities was a result of the redemption by the Company of approximately $75.0 million of the outstanding 10% Debentures due June 2068, all of which are held by Capital Trust IV. We used available cash to fund the redemption. The proceeds from the partial redemption of the 10% Debentures were applied to redeem a proportionate amount of the Trust Preferred Securities and the Trust’s common securities, which totaled $75.0 million of Trust Preferred Securities and $5,225 of Trust common securities.
	Under current accounting rules, the trusts qualify as variable interest entities for which we are not the primary beneficiary and therefore are ineligible for consolidation in our financial statements. The Debentures issued by us to the trusts are included in our Consolidated Statements of Financial Condition as "long-term debt" with the corresponding interest distributions recorded as interest expense. The common shares issued by the trusts are included in other assets in our Consolidated Statements of Financial Condition with the related dividend distributions recorded in other non-interest income.
	Common Securities, Preferred Securities, and Related Debentures
	(Dollars in thousands)
		Issuance Date	Common Securities Issued		Trust Preferred Securities Issued (1)		Coupon Rate (2)		Earliest Redemption Date (on or after) (3)	Maturity	Principal Amount of Debentures (3)
											December 31,
											2014		2013
	Bloomfield Hills Statutory Trust I	May 2004	$	248	$	8,000	2.89	%	17-Jun-09	Jun-34	$	8,248	$	8,248
	PrivateBancorp Statutory Trust II	June 2005	1,547		50,000		1.95	%	Sept. 15, 2010	Sept. 2035	51,547		51,547
	PrivateBancorp Statutory Trust III	Dec. 2005	1,238		40,000		1.74	%	Dec. 5, 2010	Dec. 2035	41,238		41,238
	PrivateBancorp Capital Trust IV	May 2008	5		68,750		10	%	15-Jun-13	Jun-68	68,755		143,760
	Total		$	3,038	$	166,750					$	169,788	$	244,793
	(1)	The trust preferred securities accrue distributions at a rate equal to the interest rate on and have a maturity identical to that of the related Debentures. The trust preferred securities will be redeemed upon maturity or earlier redemption of the related Debentures.
	(2)	Reflects the coupon rate in effect at December 31, 2014. The coupon rate for the Bloomfield Hills Statutory Trust I is a variable rate and is based on three-month LIBOR plus 2.65%. The coupon rates for the PrivateBancorp Statutory Trusts II and III are at a variable rate based on three-month LIBOR plus 1.71% for Trust II and three-month LIBOR plus 1.50% for Trust III. The coupon rate for the PrivateBancorp Capital Trust IV is fixed. Distributions for all of the Trusts are payable quarterly. We have the right to defer payment of interest on the Debentures at any time or from time to time for a period not exceeding ten years in the case of the Debentures held by Trust IV, and five years in the case of all other Debentures, without causing an event of default under the related indenture, provided no extension period may extend beyond the stated maturity of the Debentures. During such extension period, distributions on the trust preferred securities would also be deferred, and our ability to pay dividends on our common stock would generally be prohibited. The Federal Reserve has the ability to prevent interest payments on the Debentures.
	(3)	The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the Debentures at maturity or upon their earlier redemption in whole or in part. The Debentures are redeemable in whole or in part prior to maturity at any time after the dates shown in the table and, only after we have obtained Federal Reserve approval, if then required under applicable guidelines or regulations.

EARNINGS_PER_COMMON_SHARE

EARNINGS PER COMMON SHARE	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
EARNINGS PER COMMON SHARE	EARNINGS PER COMMON SHARE
	Basic and Diluted Earnings per Common Share
	(Amounts in thousands, except per share data)
		Year Ended December 31,
		2014			2013			2012
	Basic earnings per common share
	Net income	$	153,079		$	122,949		$	77,896
	Preferred stock dividends and discount accretion	—			—			(13,368		)
	Net income available to common stockholders	153,079			122,949			64,528
	Net income allocated to participating stockholders (1)	(2,134		)	(2,436		)	(1,145		)
	Net income allocated to common stockholders	$	150,945		$	120,513		$	63,383
	Weighted-average common shares outstanding	77,007			76,398			71,951
	Basic earnings per common share	$	1.96		$	1.58		$	0.88
	Diluted earnings per common share
	Diluted earnings applicable to common stockholders (2)	$	150,967		$	120,520		$	63,383
	Weighted-average diluted common shares outstanding:
	Weighted-average common shares outstanding	77,007			76,398			71,951
	Dilutive effect of stock awards (3)	815			247			223
	Weighted-average diluted common shares outstanding	77,822			76,645			72,174
	Diluted earnings per common share	$	1.94		$	1.57		$	0.88
	(1)	Participating stockholders are those that hold certain share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. Such shares or units are considered participating securities (i.e., certain of the Company’s deferred and restricted stock units and nonvested restricted stock awards).
	(2)	Net income allocated to common stockholders for basic and diluted earnings per share may differ under the two-class method as a result of adding common stock equivalents for options to dilutive shares outstanding, which alters the ratio used to allocate earnings to common stockholders and participating securities for the purposes of calculating diluted earnings per share.
	(3)	For the years ended December 31, 2014, 2013, and 2012, the weighted-average outstanding non-participating securities of 1.2 million, 2.9 million and 3.7 million shares, respectively, were not included in the computation of diluted earnings per common share because their inclusion would have been antidilutive for the periods presented.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity	EQUITY
	Conversion of Nonvoting Common Stock
	Holders of our nonvoting common stock converted 1.58 million shares and 1.95 million shares in 2014 and 2013, respectively, into an equal number of newly-issued shares of our voting common stock on a one-for-one basis. The conversion was done in accordance with the terms of the nonvoting common stock and in connection with the holders' sale of such newly-issued voting common stock. At December 31, 2014, there were no shares of nonvoting common stock outstanding.
	Capital Issuances and Preferred Stock Redemption
	In the fourth quarter 2012, the Company repurchased all of the preferred stock totaling $243.8 million, or 243,815 shares and the related ten-year warrant held by the U.S. Treasury, using net proceeds raised from a $75.0 million underwritten public offering of its common stock (4,761,905 shares with an offering price of $15.75 per share) and net proceeds from the $125.0 million subordinated debentures offering, together with existing cash resources. The preferred stock and warrant were originally issued in January 2009 as part of the Troubled Asset Relief Program ("TARP") Capital Purchase Program ("CPP"). In connection with the repurchase of the preferred stock, the Company accelerated the accretion of the remaining issuance discount on the preferred stock of $2.2 million. The Company repurchased the warrant at a mutually agreed upon price of $1.2 million, which was recorded as a reduction to additional paid-in capital in the Company's Consolidated Financial Statements.
	At December 31, 2014, there were 1,000,000 shares of preferred stock authorized, and none outstanding.
	There were no public or private offerings of common stock during 2014 or 2013 other than common stock issued in connection with our share-based compensation plans. Refer to Note 16 for a detailed discussion of such plans.
	Treasury Stock
	The Company reissues treasury stock, when available, or new shares to fulfill its obligation to issue shares granted pursuant to the share-based compensation plans. Treasury shares are reissued at average cost. The Company held 2,000 shares and 274,000 shares in treasury at December 31, 2014 and 2013, respectively. Prior to 2013, the Company issued new shares to fulfill its obligation to settle share-based awards.
	Comprehensive Income
	Change in Accumulated Other Comprehensive Income ("AOCI") by Component
	(Amounts in thousands)
		Year Ended December 31,
		2014									2013									2012
		Unrealized			Accumu-			Total			Unrealized			Accumu-			Total			Unrealized			Accumu-			Total
		Gain on			lated						Gain on			lated Gain						Gain on			lated Gain
		Available-			(Loss)						Available-			(Loss) on						Available-			on
		for-Sale			Gain on						for-Sale			Effective						for-Sale			Effective
		Securities			Effective						Securities			Cash Flow						Securities			Cash Flow
					Cash Flow									Hedges									Hedges
					Hedges
	Balance at beginning of year	$	12,960		$	(3,116	)	$	9,844		$	42,219		$	5,845		$	48,064		$	45,140		1,557			$	46,697
	Increase in unrealized gains (losses) on securities	11,244			—			11,244			(46,690		)	—			(46,690		)	(4,185		)	—			(4,185		)
	Increase in unrealized gains (losses) on cash flow hedges	—			16,777			16,777			—			(8,729		)	(8,729		)	—			9,945			9,945
	Tax (expense) benefit on increase in unrealized (losses) gains	(4,435		)	(6,576		)	(11,011		)	18,142			3,390			21,532			1,455			(3,883		)	(2,428		)
	Other comprehensive income (loss) before reclassifications	6,809			10,201			17,010			(28,548		)	(5,339		)	(33,887		)	(2,730		)	6,062			3,332
	Reclassification adjustment of net gains included in net income (1)	(530		)	(9,262		)	(9,792		)	(1,174		)	(5,984		)	(7,158		)	(315		)	(2,928		)	(3,243		)
	Reclassification adjustment for tax expense on realized net gains (2)	209			3,646			3,855			463			2,362			2,825			124			1,154			1,278
	Amounts reclassified from AOCI	(321		)	(5,616		)	(5,937		)	(711		)	(3,622		)	(4,333		)	(191		)	(1,774		)	(1,965		)
	Net current period other comprehensive income (loss)	6,488			4,585			11,073			(29,259		)	(8,961		)	(38,220		)	(2,921		)	4,288			1,367
	Balance at end of year	$	19,448		$	1,469		$	20,917		$	12,960		$	(3,116	)	$	9,844		$	42,219		$	5,845		$	48,064
	-1	The amounts reclassified from AOCI for the available-for-sale securities are included in net securities gains on the Consolidated Statements of Income, while the amounts reclassified from AOCI for cash flow hedges are included in interest income on loans on the Consolidated Statements of Income.
	(2)	The tax expense amounts reclassified from AOCI in connection with the available-for-sale securities reclassification and cash flow hedges reclassification are included in income tax provision on the Consolidated Statements of Income.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES										[1]
	Components of Income Taxes
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	86,234		$	51,169		$	31,521
	State	17,078			11,179			7,172
	Total	103,312			62,348			38,693
	Deferred tax (benefit) provision:
	Federal	(7,392		)	11,749			11,668
	State	(792		)	2,897			4,160
	Total	(8,184		)	14,646			15,828
	Total income tax provision	$	95,128		$	76,994		$	54,521
	Reconciliation of Income Tax Provision to Statutory Federal Rate
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Income tax provision at statutory federal income tax rate	$	86,872		$	69,980		$	46,346
	(Decrease) increase in taxes resulting from:
	Tax exempt interest	$	(2,139	)	$	(2,158	)	$	(1,956	)
	Meals, entertainment and related expenses	621			577			483
	Bank owned life insurance	(470		)	(473		)	(542		)
	Investment credits	(331		)	(331		)	(314		)
	Non-deductible compensation	148			172			1,880
	State income taxes	10,292			8,618			6,039
	Share-based compensation charges	—			200			2,468
	Deferred tax asset adjustments	504			500			1,136
	Other	(369		)	(91		)	(1,019		)
	Total income tax provision	$	95,128		$	76,994		$	54,521
	Differences between the amounts reported in the consolidated financial statements and the tax bases of assets and liabilities result in temporary differences for which deferred tax assets and liabilities have been recorded.
	Deferred Tax Assets and Liabilities
	(Amounts in thousands)
		December 31,
		2014			2013
	Deferred tax assets:
	Allowance for loan losses	$	64,832		$	60,090
	Share-based payment expenses	16,883			15,310
	Deferred compensation	4,285			3,950
	Loan fees	18,871			15,088
	OREO write-downs and expenses	7,008			9,281
	Nonaccrual interest income	1,874			2,505
	Covered assets – loans and OREO	4,636			8,023
	Other	3,426			5,579
	Total deferred tax assets	121,815			119,826
	Deferred tax liabilities:
	Unrealized gain on securities available-for-sale	(12,450		)	(8,305		)
	Intangible assets and acquisition adjustments	(7,504		)	(8,232		)
	Premises and equipment	(1,889		)	(1,919		)
	Covered assets – FDIC loss share receivable	(694		)	(2,482		)
	Other	(1,094		)	(243		)
	Total deferred tax liabilities	(23,631		)	(21,181		)
	Net deferred tax assets	$	98,184		$	98,645
	Deferred Tax Assets
	At December 31, 2014, we have concluded that it is more likely than not that the deferred tax assets will be realized and no valuation allowance was recorded. This conclusion was based in part on the fact that we were not in a cumulative book loss position for financial statement purposes at December 31, 2014, measured on a trailing three-year basis. In addition, we considered our recent earnings history, on both a book and tax basis, and our outlook for earnings and taxable income in future periods. The net deferred tax asset is recorded on the Statement of Financial Condition within other assets.
	Taxable income in prior years and reversing deferred taxable temporary differences provide sources from which deferred tax assets may be absorbed. Most significantly, however, we have relied on our expectation of generating pre-tax earnings in future periods, which should give rise to taxable income levels, exclusive of reversing temporary differences, that more likely than not will be sufficient to absorb the deferred tax assets.
	Liabilities Associated with Unrecognized Tax Benefits
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
	Roll Forward of Unrecognized Tax Benefits
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Balance at beginning of year	$	411		$	179		$	499
	Additions for tax positions related to prior years	—			263			77
Reductions for tax positions related to prior years	(142		)	—			(380		)
Reductions for lapse of statute of limitations	—			(31		)	(17		)
Balance at end of year	$	269		$	411		$	179
Interest and penalties, net of tax effect, recognized in income tax (benefit) expense during the year	$	(6	)	$	33		$	(31	)
Interest and penalties, net of tax effect, accrued at year end (1)	$	54		$	60		$	27
(1)	Not included in the unrecognized tax benefits roll forward presented above.
As of December 31, 2014 and 2013, we had unrecognized tax benefits relating to uncertain tax positions that, if recognized, would favorably impact the effective tax rate by $212,000 and $347,000, respectively. While it is expected that the amount of unrecognized tax benefits will change in the next twelve months, the Company does not anticipate this change will have a material impact on the results of operations or the financial position of the Company.
We file a U.S. federal income tax return and state income tax returns in various states. We are no longer subject to examinations by U.S. federal tax authorities for 2007 and prior years. We are also no longer subject to examinations by certain state departments of revenue for 2007 and prior years.
[1]	Not included in the unrecognized tax benefits roll forward presented above.

ShareBased_Compensation_And_Ot

Share-Based Compensation And Other Benefits	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Share-Based Compensation And Other Benefits	SHARE-BASED COMPENSATION AND OTHER BENEFITS
	Share-Based Plans
	The Company adopted the 2011 Incentive Compensation Plan (the "2011 Plan") in May 2011. In May 2014, the Company's stockholders approved an amendment and restatement of the 2011 Plan to add 2.0 million authorized shares for a total of approximately 6.7 million shares of common stock. The 2011 Plan is designed to align the interests of management with the interests of shareholders, foster retention, create a long-term focus and provide participants a competitive long-term incentive opportunity. The 2011 Plan allows for the issuance of incentive and non-qualified stock options, stock appreciation rights, restricted stock and restricted stock units, equity-based performance stock and units, stock awards and other cash and share-based incentives to employees, including officers and non-employee directors of the Company and its subsidiaries. At December 31, 2014, 3.5 million shares were available for future grant under the 2011 Plan. The Company has three other share-based compensation plans for which no shares remain available for grant, but have unexercised awards outstanding at December 31, 2014. The Company issues shares from treasury, when available, or new shares to fulfill its obligation to issue shares pursuant to grants under the share-based compensation plans. To the extent new shares are issued, the Company believes as of December 31, 2014, there are adequate authorized shares to satisfy anticipated award issuances in 2015.
	Financial Statement Impact
	The following table presents the share-based compensation expense and related income tax benefits recognized for all equity awards in the accompanying Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012.
	Effect of Recognizing Share-based Compensation Expense
	(Amounts in thousands)
		Year Ended December 31,
		2014				2013				2012
	Recognized share-based compensation expense:
	Stock option expense	$	3,710			$	3,648			$	7,620
	Restricted stock and unit expense (including salary stock)	10,562				8,802				13,035
	Performance share unit expense	1,296				226				—
	Total share-based compensation expense	15,568				12,676				20,655
	Income tax benefit	(6,050		)		(4,818		)		(6,755		)
	Share-based compensation expense, net of tax	$	9,518			$	7,858			$	13,900
	Unrecognized share-based compensation expense:
	Stock options	$	3,391			$	4,576			$	4,302
	Weighted-average amortization period remaining (in years)	1.6				1.8				1.8
	Restricted stock and unit expense	$	11,902			$	11,205			$	9,942
	Weighted-average amortization period remaining (in years)	1.7				1.8				1.9
	Performance share unit expense (1)	$	2,694			$	635			$	—
	Weighted-average amortization period remaining (in years)	2				2.2				0
	(1)	Based on an estimate of the number of shares expected to vest as a result of actual performance against the performance criteria at December 31, 2014 and 2013. For additional information regarding our performance share units, refer to the "Performance Share Units" section further in this Note.
	Stock Options
	Stock option awards have an exercise price equal to the closing price of the Company's common stock on the date the awards are granted. Stock options generally vest ratably over three years from grant or at the end of that period based on continuous service and have a ten-year term. The following table summarizes stock option activity for the years ended December 31, 2014, 2013 and 2012.
	Stock Option Activity
	(Amounts in thousands, except per share data)
		Options			Weighted-Average						Aggregate
											Intrinsic
					Exercise				Remaining		Value (2)
					Price				Contractual
									Life (1)
	2012
	Outstanding at beginning of year	3,627			$	26.15
	Granted	646			14.43
	Exercised	(95	)		9.59
	Forfeited	(63	)		24.27
	Expired	(240	)		29.94
	Outstanding at end of year	3,875			$	24.4			6.1		$	1,381
	Exercisable at end of year	2,829			$	28.05			5.1		$	541
	2013
	Outstanding at beginning of year	3,875			$	24.4
	Granted	652			18.1
	Exercised	(200	)		14.52
	Forfeited	(86	)		17.43
	Expired	(151	)		34.1
	Outstanding at end of year	4,090			$	23.66			5.7		$	27,255
	Exercisable at end of year	2,890			$	26.68			4.5		$	12,220
	2014
	Outstanding at beginning of year	4,090			$	23.66
	Granted	203			27.98
	Exercised	(277	)		18.59
	Forfeited	(15	)		18.82
	Expired	(132	)		34.09
	Outstanding at end of year	3,869			$	23.92			5		$	38,163
	Exercisable at end of year	2,853			$	25.55			3.9		$	23,879
	Ending vested and expected to vest	3,771			$	23.98			4.9		$	36,999
	(1)	Represents the average contractual life remaining in years.
	(2)	Aggregate intrinsic value represents the total pretax intrinsic value of the "in-the-money" stock options, (i.e., the difference between our closing stock price on the last trading day of the respective year and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the respective year. This amount will fluctuate with changes in the fair value of our common stock.
	Summary of Stock Options Outstanding and Exercisable
	(Number of shares in thousands)
			Outstanding Options								Exercisable Options
	Range of Exercise Price		Shares		Weighted-Average						Shares		Weighted-
Average
Exercise
Remaining					Exercise				Price
Contractual					Price
Life (1)
$6.92 - $14.91		583		6.7		$	13.98			398		$	13.79
$14.92 - $18.67		1,023		7.4		16.74				415		15.02
$18.68 - $26.37		908		3		25.98				887		26.09
$26.38 - $32.19		746		4.8		29.61				545		30.23
$32.20 - $46.51		609		2.8		35.43				608		35.43
Total		3,869		5		$	23.92			2,853		$	25.55
(1)	Represents the weighted-average contractual life remaining in years.
Stock Option Valuation Assumptions - The fair value of stock options is estimated at the date of grant using a binomial option-pricing model that utilizes the assumptions outlined in the following table.
Stock Option Valuation Assumptions
	Year Ended December 31,
	2014				2013				2012
Expected life of the option (in years)	6				5.4 - 6.3				4.6 - 5.6
Expected stock volatility	43.3 - 44.3%				44.0 - 45.2%				44.7 - 49.8%
Risk-free interest rate	1.8 - 2.1%				1.0 - 2.1%				1.6 - 2.4%
Expected dividend yield	0.1		%		0.1 - 0.2%				0.2 - 0.3%
Weighted-average fair value of options at their grant date	$	12.2			$	7.79			$	6.52
Expected life is based on historical exercise and termination behavior. Expected stock price volatility is based on historical volatility of our common stock combined with the implied volatility on the exchange-traded stock options that are derived from the value of our common stock. The risk-free interest rate is based on the implied yield currently available on U.S. Treasury zero-coupon issues with a remaining term equal to the expected life of the option. The expected dividend yield represents the most recent annual dividend yield as of the date of grant. Management reviews and adjusts the assumptions used to calculate the fair value of an option on a periodic basis to reflect updated information.
Other Stock Option Information
(Dollars in thousands)
	Year Ended December 31,
	2014				2013				2012
Total intrinsic value of stock options exercised	$	3,204			$	1,402			$	511
Cash received from stock options exercised	$	5,149			$	2,847			$	312
Income tax benefit realized from stock options exercised (1)	$	1,217			$	502			$	199
(1)	Amounts may be more or less than deferred tax benefit recorded during vesting period.
Restricted Stock and Restricted Unit Awards
We issue common stock with restrictions to certain key employees. The shares are restricted as to transfer, but are not restricted as to voting rights except that certain dividends are subject to forfeiture under the terms of the grant. Awards granted prior to 2014 receive dividend payments at the same time as stockholders. Effective with awards granted in 2014, dividends accrued on restricted stock are not paid out until shares vest and are distributed to the holders to the extent and at the same time the underlying shares are released from restrictions. The transfer restrictions generally lapse over a three year period and are contingent upon continued employment. We also issue restricted stock units which settle in common stock when restrictions lapse which generally coincides with the vest date for most awards, however certain awards have a delayed settlement date. Restricted stock units are issued on similar terms as restricted common stock (with the exception of non-employee directors whose restrictions lapse in equal monthly installments over a one-year period) and have the right to receive dividend equivalents at settlement, but no voting rights. Recipients of restricted share and unit awards do not pay to acquire the shares awarded. The fair value of restricted stock and units is based on our closing stock price on the date of grant. For certain restricted stock awards with post-vesting transferability restrictions and certain unit awards with delayed settlement, a discount for lack of marketability ("DLOM") was applied to the grant date fair value. The weighted-average DLOM applied to awards granted was 24% in 2014, 21% in 2013 and 25% in 2012. The following table summarizes our restricted stock and unit activity for the years ended December 31, 2014, 2013 and 2012.
Restricted Stock and Unit Awards Activity
(Number of shares/units in thousands)
	Year Ended December 31,
	2014							2013						2012 (1)
	Number			Weighted-Average Grant Date Fair Value(2)				Number			Weighted-Average Grant Date Fair Value (2)			Number		Weighted-Average Grant Date Fair Value (2)
	of Shares/							of Shares/						of Shares/
	Units							Units						Units
Nonvested restricted stock and unit awards at beginning of year	1,268			$	15.76			1,114			$	14.42		1,060		$	20.84
Granted	431			27.15				676			17.14			841		14.41
Vested	(577	)		15.62				(444	)		14.53			(733	)	23.37
Forfeited	(29	)		21.51				(78	)		15.7			(54	)	18.81
Nonvested restricted stock and unit awards at end of year	1,093			$	20.18			1,268			$	15.76		1,114		$	14.42
Vested, but not issued at end of year (3)	164			$	16.56			136			$	16.52		110		$	16.89
(1)	Includes 49,992 shares of salary stock awards issued in connection with compensation restrictions under the TARP CPP at an average price of $15.51 per share. The salary stock was fully vested upon issuance with all of the rights of a stockholder, including the right to vote and receive dividends but was restricted from sale or transfer for a period of 36 months after issuance, except in the event of death or disability.
(2)	Includes the effect of the DLOM.
(3)	Represents restricted stock units with a delayed settlement date.
Other Restricted Stock and Unit Award Information
(Dollars in thousands)
	Year Ended December 31,
	2014				2013				2012
Total fair value of vested/released restricted stock and units	$	16,135			$	7,662			$	10,674
Current income tax benefit realized from vesting/release of restricted stock and unit awards (1)	$	6,036			$	2,714			$	2,919
(1)	Amount may be more or less than deferred tax benefit recorded during vesting period.
Performance Share Units
In 2013, we introduced performance share units ("PSUs") as part of our executive compensation program which entitles recipients to receive the underlying shares of common stock without payment subject to continued service and the Company's achievement of specified performance criteria over a three-year period. In 2014 we expanded the awards to a broader group of executives and added a relative total shareholder return ("TSR") factor to the award terms in addition to the achievement of specified performance criteria over a three-year period. PSUs are granted at a target number of shares and based on the Company's performance, the number of shares that vest can be adjusted downward to zero and upward to a maximum of 150% of target for the 2013 grants and upward to a maximum of 200% for 2014 grants, based on relative TSR against an index of 50 banks over the same three-year period as the performance criteria. The PSUs vest in the quarter following the end of the performance period, after review and certification of the achievement of the specified performance criteria by the Company's Compensation Committee of the Board of Directors. The PSUs will be settled and converted to shares of common stock two years after vesting, subject to recoupment under certain circumstances. Holders of PSUs are not entitled to vote or receive cash dividends until settlement, but do accrue a dividend equivalent at the same rate as dividend payments to stockholders from grant date until settlement and to be paid out at that time based on actual shares converted to common stock. The fair value of PSUs is based on our closing stock price on the date of grant, adjusted to reflect any market conditions and is net of a DLOM due to the delayed settlement provisions. The following table summarizes our performance share unit activity for the years ended December 31, 2014 and 2013.
Performance Share Units Activity (1)
(Number of shares/units in thousands)
	Year Ended December 31,
	2014							2013
	Number			Weighted-Average Grant Date Fair Value (2)				Number			Weighted-Average Grant Date Fair Value (2)
	of Shares/							of Shares/
	Units							Units
Nonvested performance share unit awards at beginning of year	54			$	15.44			—			$	—
Granted	99			26				54			15.44
Forfeited	(3	)		26				—			—
Nonvested performance share unit awards at end of year	150			$	22.19			54			$	15.44
(1)	Presented at target level of performance.
(2)	Includes the effect of a 20% DLOM on awards granted in each 2014 and 2013.
Savings and Retirement Plan
The Company has a defined contribution retirement plan, The PrivateBancorp, Inc. Savings, Retirement and Employee Stock Ownership Plan (the "KSOP"), which allows employees, at their option, to make contributions up to 75% of compensation on a pre-tax basis and/or after-tax basis through salary deferrals under Section 401(k) of the Internal Revenue Code. At the employees’ direction, employee contributions are invested among a variety of investment alternatives. For employees who have met a 1 year service requirement and make voluntary contributions to the KSOP, we contribute an amount equal to $0.50 for each dollar contributed up to 6% of an employee’s compensation (subject to certain maximum compensation amounts as prescribed in Internal Revenue Service guidance). The Company’s matching contribution vests in increments of 20% annually for each year in which 1,000 hours are worked. The KSOP also allows for a discretionary company contribution. Although no such contribution was made for 2014, 2013 or 2012, the discretionary component vests in increments of 20% annually over a period of 5 years based on the employee’s years of service.
KSOP Plan Information
(Amounts in thousands)
	Year Ended December 31,
	2014				2013				2012
Company matching contribution	$	2,509			$	2,405			$	2,164
Number of Company shares held in KSOP	373				394				411
Fair value of Company shares held by KSOP	$	12,472			$	11,412			$	6,298
Dividends received	$	16			$	16			$	17
Deferred Compensation Plan
We maintain a non-qualified deferred compensation plan (the "Plan") which allows eligible participants to defer the receipt of cash compensation or non-employee director fees otherwise payable to them. The purpose of the Plan is to further our ability to attract and retain high quality executives and non-employee directors. Employees who participate in the Plan may elect to defer up to 50% of annual base salary and 100% of annual bonus amounts not subject to a mandatory deferral and directors may elect to defer up to 100% of his or her cash portion of annual director’s fees. Participants elect at the time amounts are deferred whether such deferral amounts will be credited with "earnings" as if they were invested in either a fixed income account with interest credited based on our prime rate (not to exceed 120% of the applicable federal long-term rate) on the cash value of the funds deposited, or in deferred stock units ("DSUs") in Company stock with earnings credited in the form of dividends equivalent to that paid to our common stockholders. Except for an "earnings" credit on the deferred amounts, we do not provide any contributions or credits to participants under the Plan. At December 31, 2014 and 2013, there were 128,383 and 126,393 DSUs, respectively, in the Plan. At the time of distribution, amounts credited in DSUs are paid in shares of our common stock while amounts credited in the fixed income account are paid in cash. All elections and payments under the Plan are subject to compliance with requirements of Section 409A of the Internal Revenue Code which may limit elections and require delay in payment of benefits in certain circumstances.

Regulatory_And_Capital_Matters

Regulatory And Capital Matters	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Regulatory And Capital Matters	REGULATORY AND CAPITAL MATTERS
	The Company and the Bank are subject to various regulatory requirements that impose requirements or restrictions on cash reserves, loans or advances, and dividends. The Bank is required to maintain reserves against deposits. Reserves are held either in the form of vault cash or non-interest-bearing balances maintained with the FRB and are based on the average daily balances and statutory reserve ratios prescribed by the type of deposit account. Reserve balances required to be maintained at the FRB were $178.7 million and $123.4 million at December 31, 2014 and 2013, respectively.
	Under current FRB regulations, the Bank is limited in the amount it may loan or advance to PrivateBancorp, Inc. on an unconsolidated basis (the "Parent Company"). Loans or advances to a single subsidiary may not exceed 10% of the Bank's capital stock and surplus (as defined) and loans to all subsidiaries may not exceed 20%. Loans from the Bank to the Parent Company are also required to meet certain collateral requirements.
	Various state banking regulations limit the amount of dividends that may be paid to the Parent Company by the Bank and the payment of such dividends is contingent upon a number of factors including the Bank’s ability to meet applicable regulatory capital requirements, the strength of the Bank’s balance sheet, the Bank’s profitability and earnings and the Bank's ability to satisfy its obligations and support any projected growth. During 2014, the Bank paid $100.0 million in dividends to the Parent Company. No dividends were paid by the Bank to the Parent Company during 2013. As of December 31, 2014, the Bank had the capacity under banking regulation to pay dividends of $534.8 million, subject to the Company’s internal capital policy.
	Under applicable regulatory capital adequacy guidelines, the Company and the Bank are subject to various capital requirements adopted and administered by the federal banking agencies. These guidelines specify minimum capital ratios calculated in accordance with the definitions in the guidelines, including the leverage ratio which is Tier 1 capital as a percentage of adjusted average assets, and the Tier 1 capital ratio and the total capital ratio each as a percentage of risk-weighted assets and off-balance sheet items that have been weighted according to broad risk categories. These minimum ratios are shown in the table below.
	To satisfy safety and soundness standards, banking institutions are expected to maintain capital levels in excess of the regulatory minimums depending on the risk inherent in the balance sheet, regulatory expectations and the changing risk profile of business activities and plans. Under our capital management policy, we conduct periodic stress testing of our capital adequacy and target capital ratios at levels above regulatory minimums that we believe are appropriate based on various other risk considerations, including the current operating and economic environment and outlook, internal risk guidelines, and our strategic objectives as well as regulatory expectations.
	As of December 31, 2014, the Company's and the Bank's capital position was in excess of all minimum regulatory capital adequacy requirements to which they are subject. As of December 31, 2014, the most recent regulatory notification classified the Bank as "well-capitalized" under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes would change the Bank’s classification for this purpose. Failure to meet minimum capital requirements could result in certain mandatory, and possible discretionary, actions by regulators which, if undertaken, could have a material effect on our consolidated financial statements.
	The following table presents information about our capital measures and the related regulatory capital guidelines.
	Capital Measurements
	(Amounts in thousands, except for ratios)
		Actual				FRB Guidelines for				Regulatory Minimum
						Minimum Regulatory				For "Well-Capitalized"
						Capital				under FDICIA
		Capital		Ratio		Capital		Ratio		Capital		Ratio
	As of December 31, 2014
	Total risk-based capital:
	Consolidated	$	1,825,542	12.51	%	$	1,167,412	8	%	n/a		n/a
	The PrivateBank	1,740,736		11.95		n/a		n/a		$	1,456,366	10	%
	Tier 1 risk-based capital:
	Consolidated	1,530,579		10.49		583,706		4		n/a		n/a
	The PrivateBank	1,570,773		10.79		n/a		n/a		873,820		6
	Tier 1 leverage:
	Consolidated	1,530,579		9.96		614,996		4		n/a		n/a
	The PrivateBank	1,570,773		10.24		n/a		n/a		767,278		5
	As of December 31, 2013
	Total risk-based capital:
	Consolidated	$	1,720,740	13.3	%	$	1,035,086	8	%	n/a		n/a
	The PrivateBank	1,637,376		12.69		n/a		n/a		$	1,290,606	10	%
	Tier 1 risk-based capital:
	Consolidated	1,433,920		11.08		517,543		4		n/a		n/a
	The PrivateBank	1,475,958		11.44		n/a		n/a		774,363		6
	Tier 1 leverage:
	Consolidated	1,433,920		10.37		552,839		4		n/a		n/a
	The PrivateBank	1,475,958		10.7		n/a		n/a		689,432		5
	n/a	Not applicable
	In 2013, the FRB and other U.S. banking regulators adopted final rules that revise and replace the agencies' current regulatory capital requirements to align with the Basel III international capital standards and to implement certain changes required by the Dodd-Frank Act. The new rules require U.S. banks to hold higher amounts of capital, especially common equity, against their risk-weighted assets. The new capital requirements are higher in both quantity and quality of capital, with compliance required beginning January 1, 2015 (subject to a phase-in period). For additional information, see the "Recent Developments- Capital Requirements - Supervision and Regulation" section in Part I, Item 1 of this Form 10-K.

DERIVATIVE_INSTRUMENTS

DERIVATIVE INSTRUMENTS	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS
	We utilize an overall risk management strategy that incorporates the use of derivative instruments to reduce both interest rate risk (relating to mortgage loan commitments and planned sales of loans) and foreign currency volatility (relating to certain loans denominated in currencies other than the U.S dollar). We also use these instruments to accommodate our clients as we provide them with risk management solutions. None of the client-related and other end-user derivatives, noted in the table below, were designated as hedging instruments for accounting purposes at December 31, 2014 and 2013.
	We also use interest rate derivatives to hedge variability in forecasted interest cash flows in our loan portfolio which is comprised primarily of floating-rate loans. These derivatives are designated as cash flow hedges.
	Derivatives expose us to counterparty credit risk. Credit risk is managed through our standard underwriting process. Actual exposures are monitored against various types of credit limits established to contain risk within parameters. Additionally, credit risk is managed through the use of collateral, netting agreements, and the establishment of internal concentration limits by financial institution.
	Notional Amounts and Fair Value of Derivative Instruments
	(Amounts in thousands)
		Asset Derivatives												Liability Derivatives
		December 31, 2014						December 31, 2013						December 31, 2014					December 31, 2013
		Notional (1)			Fair			Notional (1)			Fair			Notional (1)		Fair			Notional (1)		Fair
					Value						Value					Value					Value
	Derivatives designated as hedging instruments:
	Interest rate contracts	$	550,000		$	4,542		$	350,000		$	4,005		$	250,000	$	2,715		$	325,000	$	9,748
	Derivatives not designated as hedging instruments:
	Client-related derivatives:
	Interest rate contracts	$	3,881,202		$	42,879		$	3,959,328		$	54,155		$	3,743,827	$	43,792		$	3,959,328	$	54,930
	Foreign exchange contracts	98,285			5,183			116,761			3,029			86,582		4,659			116,761		2,570
	Credit contracts (1)	98,478			19			91,694			34			100,941		24			113,348		98
	Total client-related derivatives				48,081						$	57,218				48,475					$	57,598
	Other end-user derivatives:
	Foreign exchange contracts	$	18,551		$	241		$	5,436		$	16		$	2,892	$	45		$	7,041	$	218
	Mortgage banking derivatives				786						341					801					103
	Total other end-user derivatives				$	1,027					$	357				$	846				$	321
	Total derivatives not designated as hedging instruments				$	49,108					$	57,575				$	49,321				$	57,919
	Netting adjustments (2)				(10,588		)				(13,158		)			(25,269		)			(18,777		)
	Total derivatives				$	43,062					$	48,422				$	26,767				$	48,890
	(1)	The remaining average notional amounts are shown for credit contracts.
	(2)	Represents netting of derivative asset and liability balances, and related cash collateral, with the same counterparty subject to master netting agreements.
	Master Netting Agreements
	Certain of our derivative contracts are subject to enforceable master netting agreements with derivative counterparties. Authoritative accounting guidance permits the netting of derivative receivables and payables when a legally enforceable master netting agreement exists between us and a derivative counterparty. A master netting agreement is an agreement between two counterparties who have multiple derivative contracts with each other that provide for the net settlement of contracts through a single payment, in a single currency, in the event of default on or termination of any one contract. For those derivative contracts subject to enforceable master netting agreements, derivative assets and liabilities, and related cash collateral, with the same counterparty are reported on a net basis within derivative assets and derivative liabilities on the Consolidated Statements of Financial Condition.
	Derivative contracts may require us to provide or receive cash or financial instrument collateral. Collateral associated with derivative assets and liabilities subject to enforceable master netting agreements with the same counterparty is posted on a net basis. We have pledged cash or financial collateral in accordance with each counterparty's collateral posting requirements for all of the Company's derivative assets and liabilities in a net liability position as of December 31, 2014. Certain collateral posting requirements are subject to posting thresholds and minimum transfer amounts, such that we are only required to post collateral once the posting threshold is met, and any adjustments to the amount of collateral posted must meet minimum transfer amounts.
	As of December 31, 2014, $14.7 million of cash collateral pledged was netted with the related derivative liabilities and no cash collateral was received to net with the related derivative assets on the Consolidated Statement of Financial Condition. To the extent not netted against derivative fair values under a master netting agreement, the receivable for cash pledged is included in other short-term investments. There was no receivable for cash pledged at December 31, 2014. Any securities pledged to counterparties as financial instrument collateral remain on the Consolidated Statements of Financial Condition as long as we do not default.
	The following table presents information about our derivative assets and liabilities and the related collateral by derivative type (e.g., interest rate contracts). As we post collateral with counterparties on the basis of our net position in all derivative contracts with a given counterparty, the information presented below aggregates the derivative contracts entered into with the same counterparty.
	Offsetting of Derivative Assets and Liabilities
	(Amounts in thousands)
		Gross Amounts of Recognized Assets / Liabilities (1)			Gross Amounts Offset (2)			Net Amount Presented on the Statement of Financial Condition			Gross Amounts Not Offset on the Statement of Financial Condition (3)
											Financial Instruments (4)			Cash Collateral		Net Amount
	As of December 31, 2014
	Derivative assets
	Interest rate contracts	$	47,421		$	(7,433	)	$	39,988		$	—		$	—	$	39,988
	Foreign exchange contracts	3,664			(3,154		)	510			—			—		510
	Credit contracts	19			(1		)	18			—			—		18
	Total derivatives subject to a master netting agreement	51,104			(10,588		)	40,516			—			—		40,516
	Total derivatives not subject to a master netting agreement	2,546			—			2,546			—			—		2,546
	Total derivatives	$	53,650		$	(10,588	)	$	43,062		$	—		$	—	$	43,062
	Derivative liabilities
	Interest rate contracts	$	46,507		$	(24,067	)	$	22,440		$	(17,755	)	$	—	$	4,685
	Foreign exchange contracts	2,421			(1,202		)	1,219			(965		)	—		254
	Credit contracts	24			—			24			(19		)	—		5
	Total derivatives subject to a master netting agreement	48,952			(25,269		)	23,683			(18,739		)	—		4,944
	Total derivatives not subject to a master netting agreement	3,084			—			3,084			—			—		3,084
	Total derivatives	$	52,036		$	(25,269	)	$	26,767		$	(18,739	)	$	—	$	8,028
	(1)	All derivative contracts are over-the-counter contracts.
	(2)	Represents end-user, client-related and cash flow hedging derivative contracts and related cash collateral entered into with the same counterparty and subject to a master netting agreement.
	(3)	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
	(4)	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.
	Offsetting of Derivative Assets and Liabilities (Continued)
	(Amounts in thousands)
		Gross Amounts of Recognized Assets / Liabilities (1)			Gross Amounts Offset (2)			Net Amount Presented on the Statement of Financial Condition			Gross Amounts Not Offset on the Statement of Financial Condition (3)
											Financial Instruments (4)			Cash Collateral		Net Amount
	As of December 31, 2013
	Derivative assets
	Interest rate contracts	$	58,160		$	(12,371	)	$	45,789		$	—		$	—	$	45,789
	Foreign exchange contracts	1,298			(767		)	531			—			—		531
	Credit contracts	34			(20		)	14			—			—		14
Total derivatives subject to a master netting agreement	59,492			(13,158		)	46,334			—			—		46,334
Total derivatives not subject to a master netting agreement	2,088			—			2,088			—			—		2,088
Total derivatives	$	61,580		$	(13,158	)	$	48,422		$	—		$	—	$	48,422
Derivative liabilities
Interest rate contracts	$	64,678		$	(17,990	)	$	46,688		$	(41,192	)	$	—	$	5,496
Foreign exchange contracts	2,462			(767		)	1,695			(1,495		)	—		200
Credit contracts	98			(20		)	78			(69		)	—		9
Total derivatives subject to a master netting agreement	67,238			(18,777		)	48,461			(42,756		)	—		5,705
Total derivatives not subject to a master netting agreement	429			—			429			—			—		429
Total derivatives	$	67,667		$	(18,777	)	$	48,890		$	(42,756	)	$	—	$	6,134
(1)	All derivative contracts are over-the-counter contracts.
(2)	Represents end-user, client-related and cash flow hedging derivative contracts entered into with the same counterparty and subject to a master netting agreement.
(3)	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
(4)	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.
Certain of our derivative contracts contain embedded credit risk contingent features that if triggered either allow the derivative counterparty to terminate the derivative or require additional collateral. These contingent features are triggered if we do not meet specified financial performance indicators such as minimum capital ratios under the federal banking agencies’ guidelines. All such requirements were met at December 31, 2014 and December 31, 2013. Details on these derivative contracts are set forth in the following table.
Derivatives Subject to Credit Risk Contingency Features
(Amounts in thousands)
	December 31,
	2014			2013
Fair value of derivatives with credit contingency features in a net liability position	$	14,596		$	28,152
Collateral posted for those transactions in a net liability position	$	16,865		$	30,272
If credit risk contingency features were triggered:
Additional collateral required to be posted to derivative counterparties	$	—		$	—
Outstanding derivative instruments that would be immediately settled	$	14,596		$	28,152
Derivatives Designated in Hedge Relationships
The objective of our hedging program is to use interest rate derivatives to manage our exposure to interest rate movements.
Cash Flow Hedges – Under our cash flow hedging program we enter into receive fixed/pay variable interest rate swaps to convert certain floating-rate commercial loans to fixed-rate to reduce the variability in forecasted interest cash flows due to market interest rate changes. We use regression analysis to assess the effectiveness of cash flow hedges at both the inception of the hedge relationship and on an ongoing basis. Ineffectiveness is generally measured as the amount by which the cumulative change in fair value of the hedging instrument exceeds the present value of the cumulative change in the expected cash flows of the hedged item. Measured ineffectiveness is recognized directly in other non-interest income in the Consolidated Statements of Income. During the year ended December 31, 2014, there were no gains or losses from cash flow hedge derivatives related to ineffectiveness that were reclassified to current earnings. The effective portion of the gains or losses on cash flow hedges are recorded, net of tax, in accumulated other comprehensive income ("AOCI") and are subsequently reclassified to interest income on loans in the period that the hedged interest cash flows affect earnings. As of December 31, 2014, the maximum length of time over which forecasted interest cash flows are hedged is five years. There are no components of derivative gains or losses excluded from the assessment of hedge effectiveness related to our cash flow hedge strategy.
Change in Accumulated Other Comprehensive Income
Related to Interest Rate Swaps Designated as Cash Flow Hedge
(Amounts in thousands)
	Year Ended December 31,
	2014						2013
	Pre-tax			After-tax			Pre-tax			After-tax
Accumulated unrealized (loss) gain at beginning of year	$	(5,110	)	$	(3,116	)	$	9,603		$	5,845
Amount of gain (loss) recognized in AOCI (effective portion)	16,777			10,201			(8,729		)	(5,339		)
Amount reclassified from AOCI to interest income on loans	(9,262		)	(5,616		)	(5,984		)	(3,622		)
Accumulated unrealized gain (loss) at end of year	$	2,405		$	1,469		$	(5,110	)	$	(3,116	)
As of December 31, 2014, $5.3 million in net deferred gains, net of tax, recorded in AOCI are expected to be reclassified into earnings during the next twelve months. This amount could differ from amounts actually recognized due to changes in interest rates, hedge de-designations, and the addition of other hedges subsequent to December 31, 2014. During the year ended December 31, 2014, there were no gains or losses from cash flow hedge derivatives reclassified to current earnings because it became probable that the original forecasted transaction would not occur.
Derivatives Not Designated in Hedge Relationships
Other End-User Derivatives – We enter into derivatives that include commitments to fund residential mortgage loans to be sold into the secondary market and forward commitments for the future delivery of residential mortgage loans. It is our practice to enter into forward commitments for the future delivery of residential mortgage loans when we enter into customer interest rate lock commitments. This practice allows us to economically hedge the effect of changes in interest rates on our commitments to fund the loans as well as on our portfolio of mortgage loans held-for-sale. At December 31, 2014, the par value of our mortgage loans held-for-sale totaled $42.2 million, the notional value of our interest rate lock commitments totaled $44.7 million, and the notional value of our forward commitments for the future delivery of residential mortgage loans totaled $86.9 million.
We are also exposed at times to foreign exchange risk as a result of originating loans in which the principal and interest are settled in a currency other than U.S. dollars. As of December 31, 2014, our exposure was to the Euro, Canadian dollar, British pound and Danish Kroner on $16.2 million of loans. We manage this risk using forward currency derivatives.
Client-Related Derivatives – We offer, through our capital markets group, over-the-counter interest rate and foreign exchange derivatives to our clients, including but not limited to, interest rate swaps, interest rate options (also referred to as caps, floors, collars, etc.), foreign exchange forwards and options, as well as cash products such as foreign exchange spot transactions. When our clients enter into an interest rate or foreign exchange derivative transaction with us, we mitigate our exposure to market risk through the execution of off-setting positions with inter-bank dealer counterparties. Although the off-setting nature of transactions originated by our capital markets group limits our market risk exposure, they do expose us to other risks including counterparty credit, settlement, and operational risk.
To accommodate our loan clients, we occasionally enter into risk participation agreements ("RPA") with counterparty banks to either accept or transfer a portion of the credit risk related to their interest rate derivatives or transfer a portion of the credit risk related to our interest rate derivatives. This allows clients to execute an interest rate derivative with one bank while allowing for distribution of the credit risk among participating members. We have entered into written RPAs in which we accept a portion of the credit risk associated with an interest rate derivative of another bank's loan client in exchange for a fee. We manage this credit risk through our loan underwriting process, and when appropriate, the RPA is backed by collateral provided by the clients under their loan agreement.
The current payment/performance risk of written RPAs is assessed using internal risk ratings which range from 1 to 8 with the latter representing the highest credit risk. The risk rating is based on several factors including the financial condition of the RPA’s underlying derivative counterparty, present economic conditions, performance trends, leverage, and liquidity.
The maximum potential amount of future undiscounted payments that we could be required to make under our written RPAs assumes that the underlying derivative counterparty defaults and that the floating interest rate index of the underlying derivative remains at zero percent. In the event that we would have to pay out any amounts under our RPAs, we will seek to maximize the recovery of these amounts from assets that our clients pledged as collateral for the derivative and the related loan.
Risk Participation Agreements
(Dollars in thousands)
	December 31,
	2014			2013
Fair value of written RPAs	$	24		$	98
Range of remaining terms to maturity (in years)	Less than 1 to 4			Less than 1 to 4
Range of assigned internal risk ratings	2 to 7			2 to 7
Maximum potential amount of future undiscounted payments	$	3,927		$	3,263
Percent of maximum potential amount of future undiscounted payments covered by proceeds from liquidation of pledged collateral	25		%	16		%
Gain (Loss) Recognized on Derivative Instruments
Not Designated in Hedging Relationship
(Amounts in thousands)
	Year Ended December 31,
	2014			2013			2012
Gain on client-related derivatives recognized in capital markets products income:
Interest rate contracts	$	10,634		$	14,226		$	19,613
Foreign exchange contracts	7,068			6,506			6,024
Credit contracts	345			(4		)	321
Total client-related derivatives	18,047			20,728			25,958
Gain (loss) on end-user derivatives recognized in other income:
Foreign exchange derivatives	1,402			125			(336		)
Mortgage banking derivatives	(253		)	235			123
Total end-user derivatives	1,149			360			(213		)
Total gain recognized on derivatives not designated in hedging relationship	$	19,196		$	21,088		$	25,745

COMMITMENTS_GUARANTEES_AND_CON

COMMITMENTS, GUARANTEES, AND CONTINGENT LIABILITIES	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
COMMITMENTS, GUARANTEES, AND CONTINGENT LIABILITIES	COMMITMENTS, GUARANTEES, AND CONTINGENT LIABILITIES
	Credit Extension Commitments and Guarantees
	In the normal course of business, we enter into a variety of financial instruments with off-balance sheet risk to meet the financing needs of our clients and to conduct lending activities. These instruments principally include commitments to extend credit, standby letters of credit, and commercial letters of credit. These instruments involve, to varying degrees, elements of credit and liquidity risk in excess of the amounts reflected in the Consolidated Statements of Financial Condition.
	Contractual or Notional Amounts of Financial Instruments (1)
	(Amounts in thousands)
		December 31,
		2014		2013
	Commitments to extend credit:
	Home equity lines	$	129,943	$	139,116
	Residential 1-4 family construction	53,847		32,714
	Commercial real estate, other construction, and land development	1,123,123		703,382
	Commercial and industrial	4,255,422		3,609,443
	All other commitments	336,623		222,337
	Total commitments to extend credit	$	5,898,958	$	4,706,992
	Letters of credit:
	Financial standby	$	334,175	$	308,577
	Performance standby	38,167		26,932
	Commercial letters of credit	5,224		4,500
	Total letters of credit	$	377,566	$	340,009
	(1)	Includes covered loan commitments of $11.0 million and $18.7 million as of December 31, 2014 and 2013, respectively.
	Commitments to extend credit are agreements to lend funds to a client as long as there is no violation of any condition established in the loan agreement. Commitments generally have fixed expiration dates or other termination clauses and variable interest rates tied to the prime rate or LIBOR and may require payment of a fee for the unused portion of the commitment or for the amounts issued but not drawn on letters of credit. All or a portion of commitments with an initial term extending beyond one year require regulatory capital support, while commitments of less than one year do not, although under newly issued regulatory capital rules, unfunded commitments of less than one year will require regulatory capital unless unconditionally cancellable. Since many of our commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements of the borrowers. As of December 31, 2014, we had a reserve for unfunded commitments of $12.3 million, which reflects our estimate of inherent losses associated with these commitment obligations. The balance of this reserve changes based on a number of factors including: the balance of outstanding commitments and our assessment of the likelihood of borrowers to utilize these commitments. The reserve is recorded in other liabilities in the Consolidated Statements of Financial Condition.
	Standby and commercial letters of credit are conditional commitments issued by us to guarantee the performance of a client to a third party. Standby letters of credit include performance and financial guarantees for clients in connection with contracts between our clients and third parties. Standby letters of credit are agreements where we are obligated to make payment to a third party on behalf of a client in the event the client fails to meet their contractual obligations. Commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the client and the third party. In most cases, the Company receives a fee for the amount of a letter of credit issued but not drawn upon.
	In the event of a client’s nonperformance, our credit loss exposure is equal to the contractual amount of those commitments. We manage this credit risk in a similar manner to evaluating credit risk in extending loans to clients under our credit policies. We use the same credit policies in making credit commitments as for on-balance sheet instruments, mitigating exposure to credit loss through various collateral requirements, if deemed necessary. In the event of nonperformance by the clients, we have rights to the underlying collateral, which could include commercial real estate, physical plant and property, inventory, receivables, cash and marketable securities.
	The maximum potential future payments guaranteed by us under standby letters of credit arrangements are equal to the contractual amount of the commitment. The unamortized fees associated with standby letters of credit, which are included in other liabilities in the Consolidated Statements of Financial Condition, totaled $1.4 million as of December 31, 2014. We amortize these amounts into income over the commitment period. As of December 31, 2014, standby letters of credit had a remaining weighted-average term of approximately 14 months, with remaining actual lives ranging from less than 1 year to 6 years.
	Other Commitments
	The Company has unfunded commitments to CRA investments and other investment partnerships totaling $21.6 million at December 31, 2014. Of these commitments, $8.9 million related to legally-binding unfunded commitments for tax-credit investments and was included within other assets and other liabilities on the Consolidated Statements of Financial Condition.
	Credit Card Settlement Guarantees
	Our third-party corporate credit card vendor issues corporate purchase credit cards on behalf of our commercial clients. The corporate purchase credit cards are issued to employees of certain of our commercial clients at the client’s direction and used for payment of business-related expenses. In most circumstances, these cards will be underwritten by our third-party vendor. However, in certain circumstances, we may enter into a recourse agreement, which transfers the credit risk from the third-party vendor to us in the event that the client fails to meet its financial payment obligation. In these circumstances, a total maximum exposure amount is established for our corporate client. In addition to the obligations presented in the prior table, the maximum potential future payments guaranteed by us under this third-party settlement guarantee were $11.5 million at December 31, 2014.
	We believe that the estimated amounts of maximum potential future payments are not representative of our actual potential loss given our insignificant historical losses from this third-party settlement guarantee program. As of December 31, 2014, we have no recorded contingent liability in the consolidated financial statements for this settlement guarantee program, and management believes that the probability of any loss under this arrangement is remote.
	Mortgage Loans Sold with Recourse
	Certain mortgage loans sold have limited recourse provisions. The losses for the years ended December 31, 2014 and 2013 arising from limited recourse provisions were not material. Based on this experience, the Company has not established any liability for potential future losses relating to mortgage loans sold in prior periods.
	Legal Proceedings
	In June 2013, we were served with a complaint naming the Bank as an additional defendant in a lawsuit pending in the Circuit Court of the 21st Judicial Circuit, Kankakee County, Illinois known as Maas vs. Marek et. al. The lawsuit, brought by the beneficiaries of two trusts for which the Bank is serving as the successor trustee, seeks reimbursement of penalties and interest assessed by the IRS due to the late payment of certain generation skipping taxes by the trusts, as well as certain related attorney fees and other damages. The other named defendants include legal and accounting professionals that provided services related to the matters involved. In January 2014, the Circuit Court denied the Bank’s motion to dismiss, and the matter is now in the discovery process. Although we are not able to predict the likelihood of an adverse outcome, we currently anticipate that ultimate resolution of this matter will not have a material adverse impact on our financial condition or results of operations.
	As of December 31, 2014, there were various other legal proceedings pending against the Company and its subsidiaries in the ordinary course of business. Management does not believe that the outcome of these proceedings will have, individually or in the aggregate, a material adverse effect on the Company’s results of operations, financial condition or cash flows.

ESTIMATED_FAIR_VALUE_OF_FINANC

ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS	ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS
	We measure, monitor, and disclose certain of our assets and liabilities on a fair value basis. Fair value is used on a recurring basis to account for securities available-for-sale, mortgage loans held-for-sale, derivative assets, derivative liabilities, and certain other assets and other liabilities. In addition, fair value is used on a nonrecurring basis to apply lower-of-cost-or-market accounting to foreclosed real estate and certain other loans held-for-sale, evaluate assets or liabilities for impairment, including collateral-dependent impaired loans, and for disclosure purposes. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, we use various valuation techniques and input assumptions when estimating fair value.
	U.S. GAAP requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and establishes a fair value hierarchy that prioritizes the inputs used to measure fair value into three broad levels based on the reliability of the input assumptions. The hierarchy gives the highest priority to level 1 measurements and the lowest priority to level 3 measurements. The three levels of the fair value hierarchy are defined as follows:
	•	Level 1 – Unadjusted quoted prices for identical assets or liabilities traded in active markets.
	•	Level 2 – Observable inputs other than level 1 prices, such as quoted prices for similar instruments; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.
	•	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The categorization of where an asset or liability falls within the hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	Valuation Methodology
	We believe our valuation methods are appropriate and consistent with other market participants. However, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value. Additionally, the methods used may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values.
	The following describes the valuation methodologies we use for assets and liabilities measured at fair value, including the general classification of the assets and liabilities pursuant to the valuation hierarchy.
	Securities Available-for-Sale – Securities available-for-sale include U.S. Treasury, U.S. Agency, collateralized mortgage obligations, residential mortgage-backed securities, state and municipal securities, and foreign sovereign debt. Substantially all available-for-sale securities are fixed-income instruments that are not quoted on an exchange, but may be traded in active markets. The fair value of these securities is based on quoted market prices obtained from external pricing services. The principal markets for our securities portfolio are the secondary institutional markets, with an exit price that is predominantly reflective of bid level pricing in those markets. U.S. Treasury securities have been classified in level 1 of the valuation hierarchy. All other remaining securities are classified in level 2 of the valuation hierarchy. On a quarterly basis, the Company uses a variety of methods to validate the overall reasonableness of the fair values obtained from external pricing services, including evaluating pricing service inputs and methodologies, using exception reports based on analytical criteria, comparing prices obtained to prices received from other pricing sources, and reviewing the reasonableness of prices based on the Company’s knowledge of market liquidity and other market-related conditions. While we may challenge valuation inputs used in determining prices obtained from external pricing services based on our validation procedures, we have not altered the fair values ultimately provided by the external pricing services during the periods presented.
	Mortgage Loans Held-for-Sale – Mortgage loans held-for-sale represent residential mortgage loan originations intended to be sold in the secondary market. We have elected the fair value option for residential mortgage loans originated with the intention of selling to a third party. The election of the fair value option aligns the accounting for these loans with the related mortgage banking derivatives used to economically hedge them. These mortgage loans are measured at fair value as of each reporting date, with changes in fair value recognized through mortgage banking non-interest income. The fair value of mortgage loans held-for-sale is determined based on prices obtained for loans with similar characteristics from third party sources. On a quarterly basis, the Company validates the overall reasonableness of the fair values obtained from third party sources by comparing prices obtained to prices received from various other pricing sources, and reviewing the reasonableness of prices based on Company knowledge of market liquidity and other market-related conditions. Mortgage loans held-for-sale are classified in level 2 of the valuation hierarchy.
	Collateral-Dependent Impaired Loans – We do not record loans held for investment at fair value on a recurring basis. However, periodically, we record nonrecurring adjustments to reduce the carrying value of certain impaired loans based on fair value measurement. This population of impaired loans includes those for which repayment of the loan is expected to be provided solely by the underlying collateral. We measure the fair value of collateral-dependent impaired loans based on the fair value of the collateral securing these loans less estimated selling costs. A majority of collateral-dependent impaired loans are secured by real estate with the fair value generally determined based upon appraisals performed by a certified or licensed appraiser using a combination of valuation techniques such as sales comparison, income capitalization and cost approach and include inputs such as absorption rates, capitalization rates and comparables. We also consider other factors or recent developments that could result in adjustments to the collateral value estimates indicated in the appraisals. When a collateral-dependent loan is secured by non-real estate collateral such as receivables, inventory, or equipment, the fair value is generally determined based upon appraisals, field exams, or receivable reports. The valuation techniques and inputs are reviewed internally by an asset-based specialist for reasonableness of estimated liquidation costs, collectability probabilities, and other market data. Accordingly, fair value estimates for collateral-dependent impaired loans are classified in level 3 of the valuation hierarchy. The carrying value of all impaired loans and the related specific reserves are disclosed in Note 4.
	At the time a collateral-dependent loan is initially determined to be impaired, we review the existing collateral appraisal. If the most recent appraisal is greater than one-year old, a new appraisal of the underlying collateral is obtained. The majority of collateral-dependent impaired loans are secured by real estate for which we generally obtain "as is" appraisal values in order to evaluate impairment. When a collateral-dependent loan is secured by non-real estate collateral such as receivables, inventory, or equipment, the fair value is generally determined based upon appraisals, field exams, or receivable reports. The valuation techniques and inputs are reviewed internally by workout and/or asset-based specialists for reasonableness of estimated liquidation costs, collectability probabilities, and other market data. Appraisals for real estate collateral-dependent impaired loans in excess of $500,000 are updated with new independent appraisals at least annually and are formally reviewed by our internal appraisal department. Additional diligence is performed at the six-month interval between annual appraisals. If during the course of the six-month review process there is evidence supporting a meaningful decline in the value of collateral, the appraised value is either adjusted downward or a new appraisal is required to support the value of the impaired loan. As part of our internal review process, we consider other factors or recent developments that could adjust the valuations indicated in the appraisals or internal reviews. The Company’s internal appraisal review process validates the reasonableness of appraisals in conjunction with analyzing sales and market data from an array of market sources.
	Covered Asset OREO and OREO – Covered asset OREO and OREO generated from our originated book of business are valued on a nonrecurring basis using third-party appraisals of each property and our judgment of other relevant market conditions and are classified in level 3 of the valuation hierarchy. As part of our internal review process, we consider other factors or recent developments that could adjust the valuations indicated in the appraisals or internal reviews. Updated appraisals on both OREO portfolios are typically obtained every twelve months and evaluated internally at least every six months. In addition, both property-specific and market-specific factors as well as collateral type factors are taken into consideration, which may result in obtaining more frequent appraisal updates or internal assessments. Appraisals are conducted by third-party independent appraisers under internal direction and engagement using a combination of valuation techniques such as sales comparison, income capitalization and cost approach and include inputs such as absorption rates, capitalization rate and comparables. Any appraisal with a value in excess of $250,000 is subject to a compliance review. Appraisals received with a value in excess of $1.0 million are subject to a technical review. Appraisals are either reviewed internally by our appraisal department or sent to an outside technical firm if appropriate. Both levels of review involve a scope appropriate for the complexity and risk associated with the OREO. To validate the reasonableness of the appraisals obtained, the Company compares the appraised value to the actual sales price of properties sold and analyzes the reasons why a property may be sold for less than its appraised value.
	Derivative Assets and Derivative Liabilities – Derivative instruments with positive fair values are reported as an asset and derivative instruments with negative fair value are reported as liabilities, in both cases after taking into account the effects of master netting agreements. For derivative counterparties with which we have a master netting agreement, we measure nonperformance risk on the basis of our net exposure to the counterparty. The fair value of derivative assets and liabilities is determined based on prices obtained from third party advisors using standardized industry models. Many factors affect derivative values, including the level of interest rates, the market’s perception of our nonperformance risk as reflected in our credit spread, and our assessment of counterparty nonperformance risk. The nonperformance risk assessment is based on our evaluation of credit risk, or if available, on observable external assessments of credit risk. Values of derivative assets and liabilities are primarily based on observable inputs and are classified in level 2 of the valuation hierarchy, with the exception of certain client-related derivatives and risk participation agreements, as discussed below. On a quarterly basis, the Company uses a variety of methods to validate the overall reasonableness of the fair values obtained from third party advisors, including evaluating inputs and methodologies used by the third party advisors, comparing prices obtained to prices received from other pricing sources, and reviewing the reasonableness of prices based on the Company's knowledge of market liquidity and other market-related conditions. While we may challenge valuation inputs used in determining prices obtained from third party advisors based on our validation procedures, during the years ended December 31, 2014 and 2013, we did not alter the fair values ultimately provided by the third party advisors.
	Level 3 derivatives include risk participation agreements and derivatives associated with clients whose loans are risk rated 6 or higher ("watch list derivative"). Refer to "Credit Quality Indicators" in Note 4 for further discussion on risk ratings. For these level 3 derivatives, the Company obtains prices from third party advisors, consistent with the valuation processes employed for the Company’s derivatives classified in level 2 of the fair value hierarchy, and then applies loss factors to adjust the prices obtained from third party advisors. The significant unobservable inputs that are employed in the valuation process for the risk participation agreements and watch list derivatives that cause these derivatives to be classified in level 3 of the fair value hierarchy are the historic loss factors specific to the particular industry segment and risk rating category. The loss factors are updated quarterly and are derived and aligned with the loss factors utilized in the calculation of the Company’s general reserve component of the allowance for loan losses. Changes in the fair value measurement of risk participation agreements and watch list derivatives are largely due to changes in the fair value of the derivative, risk rating adjustments and fluctuations in the pertinent historic average loss rate.
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	The following table presents the hierarchy level and fair value for each major category of assets and liabilities measured at fair value at December 31, 2014 and 2013 on a recurring basis.
	Fair Value Measurements on a Recurring Basis
	(Amounts in thousands)
		31-Dec-14														December 31, 2013
		Quoted				Significant			Significant				Total			Quoted		Significant			Significant			Total
		Prices in				Other			Unobservable							Prices in		Other			Unobservable
		Active				Observable			Inputs							Active		Observable			Inputs
		Markets				Inputs			(Level 3)							Markets		Inputs			(Level 3)
		for Identical				(Level 2)										for Identical		(Level 2)
		Assets														Assets
		(Level 1)														(Level 1)
	Assets:
	Securities available-for-sale:
	U.S. Treasury	$	268,265			$	—		$	—			$	268,265		$	142,575	$	—		$	—		$	142,575
	U.S. Agencies	—				46,258			—				46,258			—		45,528			—			45,528
	Collateralized mortgage obligations	—				136,933			—				136,933			—		176,116			—			176,116
	Residential mortgage-backed securities	—				846,078			—				846,078			—		963,107			—			963,107
	State and municipal securities	—				347,310			—				347,310			—		274,650			—			274,650
	Foreign sovereign debt	—				500			—				500			—		500			—			500
	Total securities available-for-sale	268,265				1,377,079			—				1,645,344			142,575		1,459,901			—			1,602,476
	Mortgage loans held-for-sale	—				42,215			—				42,215			—		17,619			—			17,619
	Derivative assets:
	Interest rate contract derivatives designated as hedging instruments	—				4,542			—				4,542			—		4,005			—			4,005
	Client-related derivatives	—				46,669			1,412				48,081			—		56,770			448			57,218
	Other end-user derivatives	—				1,027			—				1,027			—		357			—			357
	Netting adjustments	—				(9,952		)	(636		)		(10,588		)	—		(13,138		)	(20		)	(13,158		)
	Total derivative assets	—				42,286			776				43,062			—		47,994			428			48,422
	Total assets	$	268,265			$	1,461,580		$	776			$	1,730,621		$	142,575	$	1,525,514		$	428		$	1,668,517
	Liabilities:
	Derivative liabilities:
	Interest rate contract derivatives designated as hedging instruments	$	—			$	2,715		$	—			$	2,715		$	—	$	9,748		$	—		$	9,748
	Client-related derivatives	—				47,799			676				48,475			—		57,500			98			57,598
	Other end-user derivatives	—				846			—				846			—		321			—			321
	Netting adjustments	—				(24,633		)	(636		)		(25,269		)	—		(18,757		)	(20		)	(18,777		)
	Total derivative liabilities	$	—			$	26,727		$	40			$	26,767		$	—	$	48,812		$	78		$	48,890
	If a change in valuation techniques or input assumptions for an asset or liability occurred between periods, we would consider whether this would result in a transfer between the three levels of the fair value hierarchy. There have been no transfers of assets or liabilities between level 1 and level 2 of the valuation hierarchy between December 31, 2013 and December 31, 2014.
	There have been no other changes in the valuation techniques we used for assets and liabilities measured at fair value on a recurring basis from December 31, 2013 to December 31, 2014.
	Reconciliation of Beginning and Ending Fair Value for Those
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (1)
	(Amounts in thousands)
		December 31, 2014							December 31, 2013
		Derivative Assets				Derivative (Liabilities)			Derivative Assets				Derivative (Liabilities)
	Balance at beginning of year	$	448			$	(98	)	$	1,023			$	(60	)
	Total gains (losses):
	Included in earnings (2)	455				660			126				(14		)
	Purchases, issuances, sales and settlements:
Issuances	—				—			—				(51		)
Settlements	(1,487		)		(24		)	(841		)		—
Transfers into Level 3 (out of Level 2) (3)	2,717				(1,411		)	575				—
Transfers out of Level 3 (into Level 2) (3)	(721		)		197			(435		)		27
Balance at end of year	$	1,412			$	(676	)	$	448			$	(98	)
Change in unrealized gains (losses) in earnings relating to assets and liabilities still held at end of year	$	353			$	102		$	(19	)		$	(21	)
(1)	Fair value is presented prior to giving effect to netting adjustments.
(2)	Amounts disclosed in this line are included in the Consolidated Statements of Income as capital markets products income for derivatives.
(3)	Transfers in and transfers out are recognized at the end of each quarterly reporting period. In general, derivative assets and liabilities are transferred into Level 3 from Level 2 due to a lack of observable market data, as there was deterioration in the credit risk of the derivative counterparty. Conversely, derivative assets and liabilities are transferred out of Level 3 into Level 2 due to an improvement in the credit risk of the derivative counterparty.
Financial Instruments Recorded Using the Fair Value Option
Difference Between Aggregate Fair Value and Aggregate Remaining Principal Balance
for Mortgage Loans Held-For-Sale Elected to be Carried at Fair Value
(Amounts in thousands)
	December 31,
	2014				2013
Aggregate fair value	$	42,215			$	17,619
Difference (1)	(16		)		238
Aggregate unpaid principal balance	$	42,199			$	17,857
(1)	The change in fair value is reflected in mortgage banking non-interest income.
As of December 31, 2014, none of the mortgage loans held-for-sale were on nonaccrual or 90 days or more past due and still accruing interest. Changes in fair value due to instrument-specific credit risk for the year ended December 31, 2014 were not material.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
From time to time, we may be required to measure certain other financial assets at fair value on a nonrecurring basis. These adjustments to fair value usually result from the application of lower-of-cost-or-fair-value accounting or write-downs of individual assets when there is evidence of impairment.
The following table provides the fair value of those assets that were subject to fair value adjustments during the years ended December 31, 2014 and 2013 and still held at December 31, 2014 and 2013, respectively. All fair value measurements on a nonrecurring basis were measured using level 3 of the valuation hierarchy.
Fair Value Measurements on a Nonrecurring Basis
(Amounts in thousands)
	Fair Value							Losses
	December 31,							For the Year Ended
	2014				2013			2014				2013
Collateral-dependent impaired loans (1)	$	34,192			$	45,937		$	5,440			$	4,656
Covered assets - OREO (2) (3)	143				6,044			5				532
OREO (2)	8,657				18,764			5,817				12,711
Total	$	42,992			$	70,745		$	11,262			$	17,899
(1)	Represents the fair value of loans adjusted to the appraised value of the collateral with a write-down in fair value or change in specific reserves during the respective period. These fair value adjustments are recorded against the allowance for loan losses.
(2)	Represents the fair value of foreclosed properties that were adjusted subsequent to their initial classification as foreclosed assets. Write-downs are recognized as a component of net foreclosed real estate expense in the Consolidated Statements of Income.
(3)	The 20% portion of any covered asset OREO write-down not reimbursed by the FDIC is recorded as net foreclosed real estate expense.
There have been no changes in the valuation techniques we used for assets and liabilities measured at fair value on a nonrecurring basis from December 31, 2013 to December 31, 2014.
Additional Information Regarding Level 3 Fair Value Measurements
The following table presents information regarding the unobservable inputs developed by the Company for its level 3 fair value measurements.
Quantitative Information Regarding Level 3 Fair Value Measurements
(Dollars in thousands)
Financial Instrument:	Fair Value				Valuation Technique(s)		Unobservable	Range		Weighted
	of Assets						Input			Average
	(Liabilities) at
	December 31,
	2014
Watch list derivatives	$	741			Discounted cash flow		Loss factors	4.3% to 16.0%		15.4	%
Risk participation agreements	$	(5	)	(1)	Discounted cash flow		Loss factors	0.6% to 16.0%		4.7	%
Collateral-dependent impaired loans	$	34,192			Sales comparison,		Property specific	-1.2% to -34.7%		-21.9	%	(2)
					income capitalization		adjustment
					and/or cost approach
OREO	$	8,657			Sales comparison,		Property specific	-0.1% to -100.0%		-19.1	%	(2)
					income capitalization		adjustment
					and/or cost approach
(1)	Represents fair value of underlying swap.
(2)	Weighted average is calculated based on assets with a property specific adjustment.
The significant unobservable inputs used in the fair value measurement of the risk participation agreements and watch list derivatives are the historic loss factors. A significant increase (decrease) in the pertinent loss factor would result in a significantly lower (higher) fair value measurement.
Estimated Fair Value of Certain Financial Instruments
U.S. GAAP requires disclosure of the estimated fair values of certain financial instruments, both assets and liabilities, on and off-balance sheet, for which it is practical to estimate the fair value. Because the disclosure of estimated fair values provided herein excludes the fair value of certain other financial instruments and all non-financial instruments, any aggregation of the estimated fair value amounts presented would not represent total underlying value. Examples of non-financial instruments having value not disclosed herein include the future earnings potential of significant customer relationships and the value of our asset management operations and other fee-generating businesses. In addition, other significant assets including property, plant, and equipment and goodwill are not considered financial instruments and, therefore, have not been included in the disclosure.
Various methodologies and assumptions have been utilized in management’s determination of the estimated fair value of our financial instruments, which are detailed below. The fair value estimates are made at a discrete point in time based on relevant market information. Because no market exists for a significant portion of these financial instruments, fair value estimates are based on judgments regarding future expected economic conditions, loss experience, and risk characteristics of the financial instruments. These estimates are subjective, involve uncertainties, and cannot be determined with precision. Changes in assumptions could significantly affect the estimates.
In addition to the valuation methodology explained above for financial instruments recorded at fair value, the following methods and assumptions were used in estimating the fair value of financial instruments that are carried at cost in the Consolidated Statements of Financial Condition and includes the general classification of the assets and liabilities pursuant to the valuation hierarchy.
Short-term financial assets and liabilities – For financial instruments with a shorter-term or with no stated maturity, prevailing market rates, and limited credit risk, the carrying amounts approximate fair value. Those financial instruments include cash and due from banks, federal funds sold and interest-bearing deposits in banks (including the receivable for cash collateral pledged), accrued interest receivable, and accrued interest payable. Accrued interest receivable and accrued interest payable are classified consistent with the hierarchy of their corresponding assets and liabilities.
Other loans held-for-sale - Included in loans held-for-sale at December 31, 2014 are $36.6 million of loans carried at the lower of aggregate cost or fair value and $36.3 million of loans held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia, which closed in January 2015. Fair value estimates are based on the actual agreed upon price in the agreement.
Securities held-to-maturity – Securities held-to-maturity include collateralized mortgage obligations, residential mortgage-backed securities, agency commercial mortgage-backed securities and state and municipal securities. Substantially all held-to-maturity securities are fixed income instruments that are not quoted on an exchange, but may be traded in active markets. The fair value of these securities is based on quoted market prices obtained from external pricing services. The principal markets for our securities portfolio are the secondary institutional markets, with an exit price that is predominantly reflective of bid level pricing in those markets.
FHLB stock – The carrying value of FHLB stock approximates fair value as the stock is non-marketable, but can only be sold to the FHLB or another member institution at par.
Loans – The fair value of loans is calculated by discounting estimated cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan. Cash flows are estimated by applying contractual payment terms to assumed interest rates. The estimate of maturity is based on contractual terms and includes assumptions that reflect our and the industry’s historical experience with repayments for each loan classification. The estimation is modified, as required, by the effect of current economic and lending conditions, collateral, and other factors.
Covered assets – Covered assets include acquired loans and foreclosed loan collateral covered under a loss sharing agreement with the FDIC (including the fair value of expected reimbursements from the FDIC). The fair value of covered assets is calculated by discounting contractual cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the asset. The estimate of maturity is based on contractual terms and includes assumptions that reflect our and the industry’s historical experience with repayments for each asset classification. The estimate is modified, as required, by the effect of current economic and lending conditions, collateral, and other factors.
Investment in BOLI – The cash surrender value of our investment in bank owned life insurance approximates the fair value.
Deposit liabilities – The fair values disclosed for noninterest-bearing deposits, savings deposits, interest-bearing demand deposits, and money market deposits are approximately equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). The fair values for certificate of deposits and time deposits were estimated using present value techniques by discounting the future cash flows at rates based on internal models and broker quotes.
Deposits held-for-sale – Deposits held-for-sale are recorded at the lower of cost or fair value. Amounts held at December 31, 2014 are deposits held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia. Fair value estimates are based upon the price and premium per the agreement.
Short-term and other borrowings – The fair value of FHLB advances with remaining maturities of one year or less is estimated by discounting the obligations using the rates currently offered for borrowings of similar remaining maturities. The fair value of secured borrowings is equal to the value of the loans they are collateralizing. See "Loans" above for further information. The carrying amount of the obligation for cash collateral held is considered to be its fair value because of its short-term nature.
Long-term debt – The fair value of the Company's fixed-rate long-term debt was estimated using the unadjusted publicly-available market price as of period end.
FHLB advances with remaining maturities greater than one year and the Company's variable-rate junior subordinated debentures are estimated by discounting future cash flows. For the FHLB advances with remaining maturities greater than one year, the Company discounts cash flows using quoted interest rates for similar financial instruments. For the Company's variable-rate junior subordinated debentures, we interpolate a discount rate we believe is appropriate based on quoted interest rates and entity specific adjustments.
Commitments – Given the limited interest rate risk posed by the commitments outstanding at period end due to their variable rate structure, termination clauses provided in the agreements, and the market rate of fees charged, we have deemed the fair value of commitments outstanding to be immaterial.
Financial Instruments
(Amounts in thousands)
	As of December 31, 2014
	Carrying Amount							Fair Value Measurements Using
					Fair Value			Level 1				Level 2			Level 3
Financial Assets:
Cash and due from banks	$	132,211			$	132,211		$	132,211			$	—		$	—
Federal funds sold and interest-bearing deposits in banks	292,341				292,341			—				292,341			—
Loans held-for-sale	115,161				115,161			—				115,161			—
Securities available-for-sale	1,645,344				1,645,344			268,265				1,377,079			—
Securities held-to-maturity	1,129,285				1,132,615			—				1,132,615			—
FHLB stock	28,666				28,666			—				28,666			—
Loans, net of allowance for loan losses and unearned fees	11,739,721				11,736,461			—				—			11,736,461
Covered assets, net of allowance for covered loan losses	28,941				33,988			—				—			33,988
Accrued interest receivable	40,531				40,531			—				—			40,531
Investment in BOLI	55,207				55,207			—				—			55,207
Derivative assets	43,062				43,062			—				42,286			776
Financial Liabilities:
Deposits	$	13,089,968			$	13,095,657		$	—			$	10,595,040		$	2,500,617
Deposits held-for-sale	122,216				117,572							117,572
Short-term and other borrowings	432,385				430,944			—				427,150			3,794
Long-term debt	344,788				332,374			204,320				54,092			73,962
Accrued interest payable	6,948				6,948			—				—			6,948
Derivative liabilities	26,767				26,767			—				26,727			40
Financial Instruments (Continued)
(Amounts in thousands)
	As of December 31, 2013
	Carrying Amount							Fair Value Measurements Using
					Fair Value			Level 1				Level 2			Level 3
Financial Assets:
Cash and due from banks	$	133,518			$	133,518		$	133,518			$	—		$	—
Federal funds sold and interest-bearing deposits in banks	306,544				306,544			—				306,544			—
Loans held-for-sale	26,816				26,816			—				26,816			—
Securities available-for-sale	1,602,476				1,602,476			142,575				1,459,901			—
Securities held-to-maturity	921,436				896,908			—				896,908			—
FHLB stock	30,005				30,005			—				30,005			—
Loans, net of allowance for loan losses and unearned fees	10,500,912				10,484,250			—				—			10,484,250
Covered assets, net of allowance for covered loan losses	96,235				113,593			—				—			113,593
Accrued interest receivable	37,004				37,004			—				—			37,004
Investment in BOLI	53,865				53,865			—				—			53,865
Derivative assets	48,422				48,422			—				47,994			428
Financial Liabilities:
Deposits	$	12,013,641			$	12,024,079		$	—			$	9,443,094		$	2,580,985
Short-term borrowings	8,400				8,513			—				2,060			6,453
Long-term debt	627,793				598,260			267,360				256,825			74,075
Accrued interest payable	6,326				6,326			—				—			6,326
Derivatives liabilities	48,890				48,890			—				48,812			78

VARIABLE_INTEREST_ENTITIES

VARIABLE INTEREST ENTITIES	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
VARIABLE INTEREST ENTITIES	VARIABLE INTEREST ENTITIES
	At December 31, 2014 and 2013, the Company had no variable interest entity ("VIE") consolidated in its financial statements. The table below presents our interests in VIEs that are not consolidated in our financial statements.
	Nonconsolidated VIEs
	(Amounts in thousands)
		31-Dec-14				31-Dec-13
		Carrying		Maximum		Carrying		Maximum
		Amount		Exposure		Amount		Exposure
				to Loss				to Loss
	Trust preferred capital securities issuances	$	169,788	$	—	$	244,793	$	—
	Community reinvestment investments	14,360		16,054		7,889		9,813
	Restructured loans to commercial clients (1):
	Outstanding loan balance	49,376		57,782		43,481		48,975
	Related derivative asset	6,533		6,533		—		—
	Total	$	240,057	$	80,369	$	296,163	$	58,788
	(1)	Excludes personal loans and loans to non-for-profit entities.
	Trust preferred capital securities issuances – As discussed in Note 12, we sponsor and wholly own 100% of the common equity of four trusts that were formed for the purpose of issuing trust preferred securities to third-party investors and investing the proceeds from the sale of the trust preferred securities solely in debentures issued by the Company. The trusts’ only assets are the principal balance of the Debentures and the related interest receivable, which are included within long-term debt in our Consolidated Statements of Financial Condition. The Company is not the primary beneficiary of the trusts and accordingly, the trusts are not consolidated in our financial statements.
	Community reinvestment investments – We hold certain investments in funds that make investments to further our community reinvestment initiatives. Such investments are included within other assets in our Consolidated Statements of Financial Condition. Certain of these investments meet the definition of a VIE, but the Company is not the primary beneficiary as we are a limited investor in those investment funds and do not have the power to direct their investment activities. Accordingly, we will continue to account for our interests in these investments on an unconsolidated basis. Our maximum exposure to loss is limited to the carrying amount plus additional required future capital contributions.
	A portion of our community reinvestment investments are investments in limited liability entities that invest in affordable housing projects that qualify for low-income housing tax credits. These investments entitle the Company to tax credits through 2031. As described in Note 2, "Recently Adopted Accounting Pronouncements," as of January 1, 2014, the Company adopted new guidance that permits the Company to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Prior to adoption of this guidance, the Company accounted for all of its investments in qualified affordable housing projects using the effective yield method. As permitted under the new guidance, the Company has elected to continue accounting for preexisting tax credit investments using the effective yield method. Any new investments in qualified affordable housing projects entered into on or after January 1, 2014 that meet certain conditions will be accounted for using the proportional amortization method. As of December 31, 2014, the carrying value of the investments in qualified affordable housing projects that will be accounted for using the proportional amortization method totaled $7.5 million.
	The carrying value of the Company’s tax credit investments totaled $10.0 million and $3.0 million as of December 31, 2014 and 2013, respectively. The Company recognizes tax credits related to these investments, tax benefits from the operating losses generated by these investments, and amortization of the principal investment balances, all of which were immaterial during each of the years ended December 31, 2014 and 2013. Commitments to provide future capital contributions totaling $8.9 million as of December 31, 2014, are expected to be paid through 2029. These investments are reviewed periodically for impairment. No impairment losses have been recorded for the years ended December 31, 2014 and 2013.
	Restructured loans – For certain troubled commercial loans, we restructure the terms of the borrower’s debt in an effort to increase the probability of collecting amounts contractually due. Following a restructuring, the borrower entity typically meets the definition of a VIE, and economic events have proven that the entity’s equity is not sufficient to permit it to finance its activities without additional subordinated financial support or a restructuring of the terms of its financing. As we do not have the power to direct the activities that most significantly impact such troubled commercial borrowers’ operations, we are not considered the primary beneficiary even in situations where, based on the size of the financing provided, we are exposed to potentially significant benefits and losses of the borrowing entity. We have no contractual requirements to provide financial support to the borrowing entities beyond certain funding commitments established upon restructuring of the terms of the debt. Our interests in the troubled commercial borrowers include outstanding loans and related derivative assets. Our maximum exposure to loss is limited to these interests plus any additional future funding commitments.

OPERATING_SEGMENTS

OPERATING SEGMENTS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
OPERATING SEGMENTS	OPERATING SEGMENTS
	We have three primary operating segments: Banking, Asset Management (formerly named Trust and Investments) and the Holding Company. With respect to the Banking and Asset Management segments, each is delineated by the products and services that each segment offers. The Banking operating segment is comprised of commercial and personal banking services, including mortgage originations. Commercial banking services are primarily provided to corporations and other business clients and include a wide array of lending and cash management products. Personal banking services offered to individuals, professionals, and entrepreneurs include direct lending and depository services. The Asset Management segment includes certain activities of our PrivateWealth group, including investment management, personal trust and estate administration, custodial and escrow, retirement plans and brokerage services. The activities of the third operating segment, the Holding Company, include the direct and indirect ownership of our banking subsidiary, the issuance of debt and intersegment eliminations.
	The accounting policies of the individual operating segments are the same as those of the Company as described in Note 1. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated from consolidated results of operations.
	Financial results for each segment are presented below. For segment reporting purposes, the statement of financial condition of Asset Management is included with the Banking segment.
	Operating Segments Performance
	(Amounts in thousands)
	Year Ended December 31,	Banking		Asset Management		Holding Company			Consolidated
						and Other
						Adjustments (1)
	2014
	Net interest income (loss)	$	481,084	$	3,363	$	(29,710	)	$	454,737
	Provision for loan and covered loan losses	12,044		—		—			12,044
	Non-interest income	100,259		17,271		60			117,590
	Non-interest expense	284,726		16,554		10,796			312,076
	Income (loss) before income taxes	284,573		4,080		(40,446		)	248,207
	Income tax provision (benefit)	109,088		1,606		(15,566		)	95,128
	Net income (loss)	$	175,485	$	2,474	$	(24,880	)	$	153,079
	Assets	$	13,882,805	$	—	$	1,720,577		$	15,603,382
	Total loans	11,892,219		—		—			11,892,219
	Deposits, excluding deposits held-for-sale	13,150,600		—		(60,632		)	13,089,968
	2013
	Net interest income (loss)	$	446,556	$	3,326	$	(28,819	)	$	421,063
	Provision for loan and covered loan losses	31,796		—		—			31,796
	Non-interest income	95,344		18,387		259			113,990
	Non-interest expense	271,911		17,832		13,571			303,314
	Income (loss) before income taxes	238,193		3,881		(42,131		)	199,943
	Income tax provision (benefit)	91,402		1,532		(15,940		)	76,994
	Net income (loss)	$	146,791	$	2,349	$	(26,191	)	$	122,949
	Assets	$	12,465,063	$	—	$	1,620,683		$	14,085,746
	Total loans	10,644,021		—		—			10,644,021
	Deposits	12,069,583		—		(55,942		)	12,013,641
	2012
	Net interest income (loss)	$	438,406	$	3,067	$	(21,540	)	$	419,933
	Provision for loan and covered loan losses	71,425		—		—			71,425
	Non-interest income	93,943		17,018		80			111,041
	Non-interest expense	285,272		17,386		24,474			327,132
	Income (loss) before income taxes	175,652		2,699		(45,934		)	132,417
	Income tax provision (benefit)	67,578		1,064		(14,121		)	54,521
	Net income (loss)	$	108,074	$	1,635	$	(31,813	)	$	77,896
	Assets	$	12,552,897	$	—	$	1,504,618		$	14,057,515
	Total loans	10,139,982		—		—			10,139,982
	Deposits	12,251,614		—		(77,980		)	12,173,634
	(1)	Deposit amounts represent the elimination of Holding Company cash accounts included in total deposits of the Banking segment.

Condensed_Parent_Company_Finan

Condensed Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Parent Company Financial Statements	CONDENSED PARENT COMPANY FINANCIAL STATEMENTS
	The following represents the condensed financial statements of PrivateBancorp, Inc., the parent company.
	Statements of Financial Condition
	(Parent Company only)
	(Amounts in thousands)
		December 31,
		2014			2013
	Assets
	Cash and interest-bearing deposits	$	60,632		$	55,942
	Investment in and advances to subsidiaries	1,694,699			1,591,778
	Other assets	25,879			28,904
	Total assets	$	1,781,210		$	1,676,624
	Liabilities and Equity
	Long-term debt	$	294,788		$	369,793
	Accrued expenses and other liabilities	4,743			4,927
	Equity	1,481,679			1,301,904
	Total liabilities and equity	$	1,781,210		$	1,676,624
	Statements of Income
	(Parent Company only)
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Income
	Dividends from subsidiaries	$	100,000		$	—		$	—
	Interest income	3			3			11
	Securities transactions and other income	60			259			80
	Total income	100,063			262			91
	Expenses
	Interest expense	26,348			25,493			18,471
	Salaries and employee benefits	5,672			8,235			19,721
	Other expenses	5,123			5,336			4,754
	Total expenses	37,143			39,064			42,946
	Income (loss) before income taxes and equity in undistributed income of subsidiaries	62,920			(38,802		)	(42,855		)
	Income tax benefit	14,242			14,627			12,908
	Income (loss) before undistributed income of subsidiaries	77,162			(24,175		)	(29,947		)
	Equity in undistributed income of subsidiaries	75,917			147,124			107,843
	Net income	153,079			122,949			77,896
	Preferred stock dividend	—			—			13,368
	Net income available to common stockholders	$	153,079		$	122,949		$	64,528
	Statements of Cash Flows
	(Parent Company only)
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Operating Activities
	Net income	$	153,079		$	122,949		$	77,896
	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in undistributed income from subsidiaries	(75,917		)	(147,124		)	(107,843		)
	Share-based compensation expense	2,072			4,366			16,453
	Depreciation of premises, furniture and equipment	43			139			259
	Excess tax benefit from exercise of stock options and vesting of restricted shares	(1,147		)	(425		)	(118		)
	Net decrease in other assets	3,484			1,011			5,574
	Net (decrease) increase in other liabilities	(209		)	(714		)	661
	Net cash provided by (used in) operating activities	81,405			(19,798		)	(7,118		)
	Investing Activities	—			—			—
	Financing Activities
	Proceeds from the issuance of long-term debt	—			—			125,000
	Payments for the redemption of preferred stock	—			—			(243,815		)
	Payments for the redemption of common stock warrant	—			—			(1,225		)
	Net proceeds from the issuance of common stock	—			—			70,657
	Repayment of long-term debt	(75,005		)	—			—
	Stock repurchased in connection with benefit plans	(5,330		)	(2,522		)	(2,696		)
	Cash dividends paid	(3,125		)	(3,119		)	(13,082		)
	Proceeds from exercise of stock options and issuance of common stock under benefit plans	5,598			2,976			479
Excess tax benefit from exercise of stock options and vesting of restricted shares	1,147			425			118
Net cash used in financing activities	(76,715		)	(2,240		)	(64,564		)
Net increase (decrease) in cash and cash equivalents	4,690			(22,038		)	(71,682		)
Cash and cash equivalents at beginning of year	55,942			77,980			149,662
Cash and cash equivalents at end of year	$	60,632		$	55,942		$	77,980

Quarterly_Earnings_Performance

Quarterly Earnings Performance	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Quarterly Earnings Performance	QUARTERLY EARNINGS PERFORMANCE (UNAUDITED)
	Quarterly Earnings Performance (1)
	(Dollars in thousands, except per share data)
		2014												2013
		Fourth			Third			Second			First			Fourth			Third			Second			First
	Interest income	$	135,978		$	134,300		$	128,951		$	125,158		$	125,620		$	123,577		$	121,632		$	121,409
	Interest expense	19,102			17,542			16,600			16,406			17,164			17,742			17,900			18,369
	Net interest income	116,876			116,758			112,351			108,752			108,456			105,835			103,732			103,040
	Provision for loan and covered loan losses	4,120			3,890			327			3,707			4,476			8,120			8,843			10,357
	Fee revenue	30,426			30,666			30,063			25,905			26,461			27,655			28,873			29,827
	Net securities gains	—			3			196			331			279			118			136			641
	Non-interest expense	83,025			77,836			75,465			75,750			75,827			71,269			77,255			78,963
	Income before income taxes	60,157			65,701			66,818			55,531			54,893			54,219			46,643			44,188
	Income tax provision	22,934			25,174			25,994			21,026			21,187			21,161			17,728			16,918
	Net income	$	37,223		$	40,527		$	40,824		$	34,505		$	33,706		$	33,058		$	28,915		$	27,270
	Basic earnings per share	$	0.48		$	0.52		$	0.52		$	0.44		$	0.43		$	0.42		$	0.37		$	0.35
	Diluted earnings per share	$	0.47		$	0.51		$	0.52		$	0.44		$	0.43		$	0.42		$	0.37		$	0.35
	Return on average common equity	10.03		%	11.27		%	11.88		%	10.48		%	10.28		%	10.43		%	9.28		%	9.01		%
	Return on average assets	0.95		%	1.09		%	1.14		%	1		%	0.96		%	0.96		%	0.86		%	0.81		%
	Net interest margin – tax-equivalent	3.07		%	3.23		%	3.21		%	3.23		%	3.18		%	3.18		%	3.22		%	3.19		%
	(1)	All ratios are presented on an annualized basis.

SUBSEQUENT_EVENTS_SUBSEQUENT_E

SUBSEQUENT EVENTS SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS
	In fourth quarter 2014, we entered into a purchase and assumption agreement to sell our banking office in Norcross, Georgia. The transaction included the sale of certain deposits and loans made to retail and small business banking clients, which at December 31, 2014 totaled $122.2 million of deposits and $36.3 million of loans, each classified as held-for-sale. On January 20, 2015, we completed the sale and as a result recognized a gain of $4.3 million on the transaction, with $4.0 million of the gain recognized in the first quarter 2015. At consummation of the transaction, the amount of deposits and loans sold totaled $106.9 million and $36.7 million, respectively.

Recovered_Sheet1

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Nature of Operations and Principles Of Consolidation And Basis Of Presentation	Nature of Operations – PrivateBancorp, Inc. ("PrivateBancorp" or the "Company") was incorporated in Delaware in 1989 and became a holding company registered under the Bank Holding Company Act of 1956, as amended. The PrivateBank and Trust Company (the "Bank" or the "PrivateBank"), the sole banking subsidiary of PrivateBancorp, was opened in Chicago in 1991. The Company completed its initial public offering in June 1999. The Bank provides customized business and personal financial services to middle market companies and business owners, executives, entrepreneurs and families in all of the markets and communities it serves. The majority of the Bank’s business is conducted in the greater Chicago market.
	Principles of Consolidation and Basis of Presentation – The accompanying consolidated financial statements include the accounts and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. In general, investments in unconsolidated entities where the Company has the ability to exercise significant influence over the entities' operating and financing decisions are accounted for using the equity method of accounting. Investments that do not meet the criteria for equity method accounting are accounted for using the cost method of accounting. Assets held in a fiduciary or agency capacity are not assets of the Company or its subsidiaries, and accordingly, are not included in the consolidated financial statements.
	The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles ("U.S. GAAP") and general practice within the banking industry. We use the accrual basis of accounting for financial reporting purposes.
	Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
	In preparing the consolidated financial statements, we have considered the impact of events occurring subsequent to December 31, 2014 for potential recognition or disclosure in this annual report on Form 10-K. The following is a summary of the significant accounting policies adhered to in the preparation of the consolidated financial statements.
Business Combinations	Business Combinations – Business combinations are accounted for under the acquisition method of accounting. Under the acquisition method, assets and liabilities of the business acquired are recorded at their estimated fair value as of the date of acquisition, with any excess of the cost of the acquisition over the fair value of the net tangible and identifiable intangible assets acquired recorded as goodwill. Results of operations of the acquired business are included in the Consolidated Statements of Income from the effective date of acquisition.
Use Of Estimates	Use of Estimates – The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates.
Cash And Cash Equivalents	Cash and Cash Equivalents – For purposes of the Consolidated Statements of Cash Flows, management has defined cash and cash equivalents to include cash and due from banks, federal funds sold, and other interest-bearing deposits in banks. Generally, federal funds are sold for one-day periods, but not longer than 30 days. Short-term investments generally mature in less than 30 days. All cash and cash equivalents have maturities of three months or less.
Debt Securities	Debt Securities – At the time of purchase, debt securities are classified as held-to-maturity or available-for-sale. Debt securities are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are carried at amortized cost. Debt securities are classified as available-for-sale when management has the intent and ability to hold such securities for an indefinite period of time, but not necessarily to maturity. Any decision to sell available-for-sale securities would be based on various factors, including, but not limited to asset/liability management strategies, changes in interest rates or prepayment risks, liquidity needs, or regulatory capital considerations. Available-for-sale securities are carried at fair value with unrealized gains and losses, net of related deferred income taxes, recorded as a separate component of other comprehensive income ("OCI").
	The historical cost of debt securities is adjusted for amortization of premiums and accretion of discounts over the life of the security, using the level-yield method. Amortization of premium and accretion of discount are included in interest income.
	Purchases and sales of securities are recognized on a trade date basis. Realized securities gains or losses are reported in net securities gains (losses) in the Consolidated Statements of Income. The cost of securities sold is based on the specific identification method. On a quarterly basis, we assess whether there have been any events or circumstances to indicate that a security for which there is an unrealized loss is impaired on an other-than-temporary ("OTTI") basis. This determination requires significant judgment. OTTI is considered to have occurred (1) if management intends to sell the security; (2) if it is more likely than not we will be required to sell the security before recovery of its amortized cost basis; or (3) if the present value of the expected cash flows is not sufficient to recover the entire amortized cost basis. For debt securities that we do not expect to sell or for which it is not more likely than not that the Company will be required to sell prior to recovery, the OTTI is separated into credit and noncredit components. The credit-related OTTI, represented by the expected loss in principal, is recognized in non-interest income, while noncredit-related OTTI is recognized in OCI. Noncredit-related OTTI results from other factors, including increased liquidity spreads and changes in risk-free interest rates. All of the OTTI is recognized in earnings for securities we expect to sell.
Federal Home Loan Bank Stock	Federal Home Loan Bank ("FHLB") Stock – Investments in FHLB stock are restricted as to redemption and are carried at cost.
Loans Held For Sale	Loans Held for Sale – Loans held for sale ("LHFS") represent mortgage loan originations intended to be sold in the secondary market and other loans that management has an active plan to sell. LHFS are carried at the lower of cost or fair value as determined on an individual asset basis or carried at fair value where the Company has elected fair value accounting. The Company has elected to measure residential mortgage loans originated as held for sale under the fair value option. Increases or decreases in the fair value of these LHFS are recognized in mortgage banking income in the Consolidated Statements of Income. Mortgage loan origination costs related to LHFS that the Company accounts for under the fair value option are recognized in noninterest expense as incurred. Held for investment loans that have been transferred to LHFS are carried at the lower of cost or fair value. For these LHFS, any decreases in value below cost are recognized in other income in the Consolidated Statements of Income and increases in fair value above cost are not recognized until the loans are sold. The credit component of any write down upon transfer to LHFS is reflected in charge-offs to the allowance for loan losses. Loan origination costs for LHFS carried at the lower of cost or fair value are capitalized as part of the carrying amount of the loans.
	Gains and losses on the disposition of loans held for sale are determined on the specific identification method. Residential mortgage loans sold in the secondary market are sold without retaining servicing rights.
Originated Loans Held For Investment	Originated Loans Held for Investment – Originated loans held for investment are carried at the principal amount outstanding, net of deferred loan fees and costs and any direct principal charge-offs. Interest income on loans is accrued based on principal amounts outstanding. Loan origination fees, fees for commitments that are expected to be exercised and certain direct loan origination costs are deferred and the net amount is amortized over the life of the related loan or commitment period as a yield adjustment. Other fees not associated with originating a loan are recognized as fee income when earned.
Impaired Loans	Impaired Loans – Impaired loans consist of nonaccrual loans (which include nonaccrual troubled debt restructurings ("TDRs")) and loans classified as accruing TDRs. A loan is considered impaired when, based on current information and events, management believes that either it is probable that we will be unable to collect all amounts due (both principal and interest) according to the original contractual terms of the loan agreement or it has been classified as a TDR. Once a loan is determined to be impaired, the amount of impairment is measured based on the loan’s observable fair value; fair value of the underlying collateral less estimated selling costs, if the loan is collateral-dependent; or the present value of expected future cash flows discounted at the loan’s effective interest rate.
	If the measurement of the impaired loan is less than the recorded investment in the loan (including accrued interest, net of deferred loan fees and costs and unamortized premium or discount), impairment is recognized by creating a specific valuation reserve as a component of the allowance for loan losses. Non-TDR impaired loans and nonaccrual TDRs exceeding $500,000 are evaluated individually, while non-TDR impaired loans and nonaccrual TDRs less than $500,000 are evaluated as pools using historical loss experience, as well as management’s loss expectations, for the respective asset class and product type. All accruing TDRs, no matter the balance, are evaluated individually.
	All impaired loans and their related reserves are reviewed and updated each quarter. Any impaired loan for which a determination has been made that the economic value is permanently reduced is charged-off against the allowance for loan losses in the period in which the determination has been made, to reflect its current economic value.
	At the time a collateral-dependent loan is initially determined to be impaired, we review the existing collateral appraisal. If the most recent appraisal is greater than one-year old, a new appraisal of the underlying collateral is obtained. The majority of collateral-dependent impaired loans are secured by real estate for which we generally obtain "as is" appraisal values in order to evaluate impairment. When a collateral-dependent loan is secured by non-real estate collateral such as receivables, inventory, or equipment, the fair value is generally determined based upon appraisals, field exams, or receivable reports. The valuation techniques and inputs are reviewed internally by workout and/or asset-based specialists for reasonableness of estimated liquidation costs, collectability probabilities, and other market data. Appraisals for real estate collateral-dependent impaired loans in excess of $500,000 are updated with new independent appraisals at least annually and are formally reviewed by our internal appraisal department. Additional diligence is performed at the six-month interval between annual appraisals. If during the course of the six-month review process there is evidence supporting a meaningful decline in the value of collateral, the appraised value is either adjusted downward or a new appraisal is required to support the value of the impaired loan. With a de minimis number of exceptions, all appraisals and internal reviews are current under this methodology at December 31, 2014.
Delinquent And Nonaccrual Loans	Delinquent and Nonaccrual Loans – Loans are reported as past due if contractual principal or interest payments are due and unpaid for 30 days or more. All loans that are over 90 days past due in principal or interest are considered "impaired" and placed on nonaccrual status. Management may also place some loans on nonaccrual status before they are 90 days past due if they meet the below definition of "impaired." When a loan is placed on nonaccrual status, accrued and unpaid interest credited to income is reversed and accretion of net deferred loan fees ceases. Subsequent receipts on nonaccrual loans are recorded as a reduction of principal, and interest income may only be recorded on a cash basis if the remaining recorded investment is deemed fully collectible. Nonaccrual loans are returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement and when the financial position of the borrower and other relevant factors indicate there is no longer doubt as to such collectibility.
Restructured Loans	Restructured Loans – Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. These modifications are structured on a loan-by-loan basis, and depending on the circumstances, may include extensions of maturity dates, rate reductions, forgiveness of principal, or other concessions. The Company may also utilize a multiple note structure as a workout alternative for certain loans. The multiple note structure typically bifurcates a troubled loan into two separate notes, where the first note is reasonably assured of repayment and performance according to the modified terms, and the portion of the troubled loan that is not reasonably assured of repayment is charged-off. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Company has granted a concession that it would not otherwise consider, are considered TDRs.
	We consider many factors in determining whether to agree to a loan modification involving concessions, and seek a solution that will both minimize potential loss to the Company and attempt to help the borrower. We evaluate our borrowers’ current and forecasted future cash flows, their ability and willingness to make current contractual or proposed modified payments, the value of the underlying collateral (if applicable), the possibility of obtaining additional security or guarantees, and the potential costs related to a repossession or foreclosure and the subsequent sale of the collateral.
	Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Generally, a nonaccrual loan that is restructured remains on nonaccrual for a period of at least six months to ensure that the borrower performs in accordance with the restructured terms including consistent and timely loan payments. However, the borrower’s performance prior to the restructuring or other significant events at the time of the restructuring may be considered in assessing whether the borrower can meet the new terms and may result in the loan being returned to accrual status after a shorter performance period or concurrent with the restructuring. In such situations, the loan will be reported as a "restructured loan accruing interest." If the borrower’s performance under the new terms is not reasonably assured, the loan remains classified as a nonaccrual loan.
Allowance For Loan Losses	Allowance for Loan Losses (the "Allowance") – We maintain an allowance for loan losses at a level management believes is sufficient to absorb credit losses inherent in our loan portfolio. The allowance for loan losses is assessed quarterly and represents an accounting estimate of probable losses in the portfolio at each balance sheet date based on a review of available and relevant information at that time. The allowance consists of reserves for probable losses that have been identified relating to specific borrowing relationships that are individually evaluated for impairment ("the specific component"), as well as probable losses inherent in our loan portfolio that are not specifically identified ("the general allocated component"), which is determined using a methodology that is a function of quantitative and qualitative factors applied to segments of our loan portfolio.
	The specific component relates to impaired loans. Impaired loans consist of nonaccrual loans (which include nonaccrual TDRs) and loans classified as accruing TDRs. See "Impaired Loans" section of this Note 1 for a detailed discussion of the specific component of the allowance for loan losses.
	To determine the general allocated component of the allowance for loan losses, we segregate loans by vintage ("transformational" and "legacy") and product type (e.g., commercial, commercial real estate) because of observable similarities in the historical performance experience of loans underwritten by these business units. In general, loans originated by the business units that existed prior to the strategic changes of the Company in 2007 are considered "legacy" loans. Loans originated by a business unit that was established in connection with or following the strategic business transformation plan are considered "transformational" loans. Renewals or restructurings of legacy loans may continue to be evaluated as legacy loans depending on the structure or defining characteristics of the new transaction. The Company has implemented a line of business model that has reorganized the legacy business units so that after 2009, all new loan originations are considered transformational. At the time an accruing loan becomes modified and meets the definition of a TDR, it is considered impaired and is no longer included as part of the general allocated component. However, our general reserve methodology considers the amount and product type of the TDRs removed as one of many credit or portfolio considerations in establishing final reserve requirements.
	The methodology produces an estimated range of potential loss exposure for the product types within each vintage. The methodology also considers where a given product type is within the range of potential losses based on an estimate of the loss emergence period. The loss emergence period is an estimate of the length of time for potential losses embedded in the portfolio today to be recognized. Factors that affect the loss emergence period include the macroeconomic landscape, industry factors, and borrower specific performance. In general, the loss emergence period tends to lengthen in times of improving conditions and shortens in time of economic distress. During 2014, we formally measured the loss emergence period by analyzing recent historical loss data and information aggregated at the product level. This analysis showed that the loss emergence period is lengthening for most product categories. We consider the appropriate balance of the general allocated component of the reserve in relation to a variety of internal and external quantitative and qualitative factors to reflect data or timeframes not captured by the basic allowance framework as well as market and economic data and management judgment. In certain instances, these additional factors and judgments may lead management to conclude that the appropriate level of the reserve is outside the range determined through the basic allowance framework.
	The product segments we evaluate in the general reserve methodology are commercial loans, commercial real estate loans, construction loans and consumer loans (which include personal loans, residential mortgage loans and home equity lines of credit). Our commercial loan portfolio includes lines of credit to businesses and term loans. Certain non-residential owner-occupied commercial real estate loans are also included in our commercial loan portfolio if the cash flows from the owner’s business serve as the primary source of loan repayment. Commercial loans contain risks unique to the business and market of each borrower and the repayment is dependent upon the financial success and viability of the borrower.
	Commercial real estate loans comprise loans secured by various types of collateral including 1-4 family non-owner occupied housing units located primarily in our target market areas, multi-family real estate, office buildings, warehouses, retail space, mixed use buildings, and vacant land, the bulk of which is held for long-term investment or development. Risks inherent in real estate lending are related to the market value of the property taken as collateral, the underlying cash flows and the general economic condition of the market in which the collateral is located. Repayment is generally dependent on the ability of the borrower to attract tenants at rental rates that provide for debt service, and ultimately the long term financing options of the borrower.
	Our construction loan portfolio consists of single-family residential properties, multi-family properties, and commercial projects, and includes both investment properties and properties that will be owner-occupied. Risks inherent in construction lending are similar to those in commercial real estate lending. Additional risks include unexpected cost increases or delays in constructing or improving a property, the borrower’s inability to generate funding until the project is complete, the more pronounced risk to interest rate movements and the real estate market that these borrowers face while a project is being completed or seeking a buyer, and the lack of availability of permanent financing. Construction loans, as a product segment, have the highest inherent risk in our portfolio.
	Consumer loans are a smaller portion of our overall portfolio and consist of residential home mortgages, home equity lines of credit and personal loans. The risk issues associated with these products are closely correlated to the U.S. housing market and the local markets in which the collateral resides and include home price declines and resulting increases in loan to value ratios, low sales volume, high unemployment rates, increases in foreclosure rates, and high delinquency rates. Some personal loans may be unsecured and therefore offer little secondary source of repayment.
	Determination of the allowance is inherently subjective, as it requires significant estimates, including the amounts and timing of expected future cash flows and collateral appraisal values on impaired loans; estimated losses on pools of homogeneous loans based on historical loss experience, risk ratings, product type, and vintage; and consideration of current economic trends and portfolio attributes, all of which may be susceptible to significant change. For instance, loss rates in our allowance methodology typically reflect the Company's more recent loss experience, by product, on a trailing twelve month basis. These loss rates consider both cumulative charge-offs and other real estate owned ("OREO") valuation adjustments over the period in the individual product categories that constitute our allowance. Default estimates use a multi-year originating vintage and rating approach. In addition, we compare current model-derived and historic reserve levels to recent charge-off trends and history in considering the appropriate reserve at each product level.
	Credit exposures deemed to be uncollectible are charged-off against the allowance, while recoveries of amounts previously charged-off are credited to the allowance. A provision for loan losses, which is a charge against earnings, is recorded to bring the allowance for loan losses to a level that, in management’s judgment, is appropriate to absorb probable losses in the loan portfolio as of the balance sheet date.
Reserve For Unfunded Commitments	Reserve for Unfunded Commitments – We maintain a reserve for unfunded commitments at a level we believe to be sufficient to absorb estimated probable losses related to unfunded credit facilities. The reserve is included in other liabilities on the Consolidated Statements of Financial Condition. The reserve is computed using a methodology similar to that used to determine the general allocated component of the allowance for loan losses and is based on a model that uses recent commitment utilization patterns at the product level as a method of predicting future usage across the portfolio. Net adjustments to the reserve for unfunded commitments are included in other non-interest expense in the Consolidated Statements of Income.
Purchased Loans	Purchased Loans – Purchased loans acquired through portfolio purchases or in a business combination are accounted for under specialized accounting guidance when the loans have evidence of credit deterioration at the time of acquisition and it is probable that not all contractual payments will be collected ("purchased impaired loans"). Evidence of credit quality deterioration as of the purchase date may include statistics such as past due and nonaccrual status, declines in borrower FICO scores, and declines in loan-to-value ratios.
	U.S. GAAP requires purchased loans not subject to the specialized accounting guidance ("purchased non-impaired loans") to be recorded at fair value at the acquisition date and prohibits the "carrying over" or creation of valuation allowances in the initial accounting for loans acquired in a transfer. Differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the life of the loan. Decreases in expected cash flows after the purchase date are recognized by recording an allowance for loan losses.
	The fair values for purchased impaired loans are determined by discounting cash flows expected to be collected using an observable discount rate for similar instruments with adjustments to the discount rate that management believes a market participant would consider in determining fair value. We estimate the timing and amount of cash flows expected to be collected at acquisition using internal models that incorporate management’s best estimate of current key assumptions, such as default rates, loss severity and payment speeds.
	Under the applicable accounting guidance for purchased impaired loans, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan using the constant effective yield method when there is a reasonable expectation about the amount and timing of such cash flows. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference. Decreases in expected cash flows subsequent to acquisition generally result in an allowance for loan losses. Subsequent increases in cash flows result in a reversal of the allowance for losses to the extent previously established or a prospective adjustment to the accretable yield. Purchased impaired loans with common risk characteristics are accounted for on a pool basis as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Because we are recognizing interest income on each pool of loans, they are all considered to be performing.
Covered Assets	Covered Assets – Purchased loans and foreclosed loan collateral covered under loss sharing or similar credit protection agreements with the Federal Deposit Insurance Corporation ("FDIC") are reported separately on the face of the Consolidated Statements of Financial Condition inclusive of the fair value of reimbursement cash flows the Company expects to receive from the FDIC under the agreement. The allowance for covered loan losses is determined without regard to the expected reimbursement from the FDIC with any provision for covered loan loss charges recorded in the Consolidated Statements of Income reflected net of such FDIC reimbursement.
Other Real Estate Owned	Other Real Estate Owned ("OREO") – OREO is comprised of property acquired through foreclosure proceedings or acceptance of a deed-in-lieu of foreclosure in partial or total satisfaction of certain loans. Properties are initially recorded at fair value less estimated selling costs. Any write-downs in the carrying value of a property at the time of acquisition are charged against the allowance for loan losses. Subsequent to initial recognition, OREO is recorded at the lower of the initial cost basis or current fair value less estimated selling costs. Any subsequent write-downs to reflect current fair value less estimated selling costs are recorded through a valuation allowance. Such write-downs, as well as gains or losses on disposition and revenues or expenses incurred in maintaining such properties and are reported in non-interest expense in the Consolidated Statements of Income.
Depreciable Assets	Depreciable Assets – Premises, leasehold improvements, furniture and equipment, and software are stated at cost less accumulated depreciation. Depreciation expense is determined by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the life of the asset or the lease term. Rates of depreciation are generally based on the following useful lives: buildings, 30-40 years; leasehold improvements, typically 1-16 years; furniture and equipment, 3-7 years; and software, 3-5 years. Gains on dispositions are included in other income, and losses on dispositions are included in other expense in the Consolidated Statements of Income. Maintenance and repairs are charged to operating expenses as incurred, while improvements that extend the useful life of assets are capitalized and depreciated over the estimated remaining life.
	Long-lived depreciable assets are evaluated periodically for impairment when events or changes in circumstances indicate the carrying amount may not be recoverable. Impairment exists when the estimated undiscounted future cash flows attributable to a long-lived asset are less than its carrying value. In that event, the Company recognizes a loss equal to the difference between the carrying amount and the estimated fair value of the asset based on a quoted market price, if applicable, or a discounted cash flow analysis. Impairment losses are recorded in other non-interest expense in the Consolidated Statements of Income.
Bank Owned Life Insurance ("BOLI")	Bank Owned Life Insurance ("BOLI") – BOLI represents life insurance policies on the lives of certain Company officers or former officers for which the Company is the beneficiary. These policies are recorded as an asset on the Consolidated Statements of Financial Condition at their cash surrender value, or the amount that could be realized currently. The change in cash surrender value and insurance proceeds received are recorded as BOLI income in non-interest income in the Consolidated Statements of Income.
Goodwill And Other Intangible Assets	Goodwill and Other Intangible Assets – Goodwill represents the excess of purchase price over the fair value of net assets acquired (including identifiable intangible assets) using the acquisition method of accounting. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability.
	Goodwill is allocated to reporting units at acquisition. We have determined that our operating segments represent our reporting units under U.S. GAAP, and goodwill is allocated to the Banking and Asset Management reporting units. Subsequent to initial recognition, goodwill is not amortized but, instead, is tested for impairment at the reporting unit level at least annually or more often if an event occurs or circumstances change that would indicate it is more likely than not that the fair value of a reporting unit is less than its carrying amount. We perform our annual goodwill impairment assessment as of October 31 each year. In the event we conclude that all or a portion of our goodwill is impaired, a non-cash charge for the amount of such impairment would be recorded in earnings. Such a charge would have no impact on tangible or regulatory capital.
	The goodwill impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. In "step one," the fair value of each reporting unit is compared to the recorded book value. Our step one calculation of each reporting unit’s fair value is based upon a simple average of two metrics: (1) a primary market approach, which measures fair value based upon trading multiples of independent publicly traded financial institutions of comparable size and character to the reporting units, and (2) an income approach, which estimates fair value based upon discounted cash flows and terminal value (using the perpetuity growth method). If the fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired and "step two" is not considered necessary. If the carrying value of a reporting unit exceeds its fair value, the impairment test continues ("step two") by comparing the carrying value of the reporting unit’s goodwill to the implied fair value of goodwill. The implied fair value of goodwill is determined using the residual approach, where the fair value of a reporting unit is allocated to all of the assets and liabilities of that unit as if the reporting unit had been acquired in a business combination and the fair value of the reporting unit, calculated in step one, is the price paid to acquire the reporting unit. The excess of the fair value of the reporting unit over the amounts assigned to its assets and liabilities is the implied fair value of goodwill. An impairment charge is recognized to the extent the carrying value of goodwill exceeds the implied fair value of goodwill.
	The Company has the option to perform a qualitative assessment of impairment for each reporting unit to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value before applying the existing two-step goodwill impairment test. If the Company concludes it is more likely than not, the Company would proceed with the existing two-step test, as described above. Otherwise, the Company would be able to bypass the two-step test and conclude that goodwill is not impaired from a qualitative perspective.
	Identified intangible assets that have a finite useful life are amortized over that life in a manner that reflects the estimated decline in the economic value of the identified intangible asset and are subject to impairment testing whenever events or changes in circumstances indicate that the carrying value may not be recoverable. All of the Company’s other intangible assets have finite lives and are amortized over their estimated useful lives with varying periods not exceeding 12 years.
Fiduciary Assets And Assets Under Management	Fiduciary Assets and Assets Under Management – Assets held in a fiduciary capacity for clients are not included in the consolidated financial statements as they are not assets of the Company or its subsidiaries. Fiduciary and asset management fees are generally determined based upon market values of assets under management as of a specified date during the period and are included as a component of non-interest income in the Consolidated Statements of Income.
Advertising Costs	Advertising Costs – All advertising costs are expensed in the period they are incurred.
Loss Contingencies	Loss Contingencies – Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated.
Derivative Instruments	Derivative Instruments – We utilize an overall risk management strategy that incorporates the use of derivative instruments to reduce interest rate risk, as it relates to mortgage loan commitments and planned sales of loans, and foreign currency volatility. We also use these instruments to accommodate our clients as we provide them with risk management solutions, including interest rate and foreign currency contracts. None of the aforementioned end-user and client-related derivatives are designated as hedging instruments.
	We also use interest rate derivatives to hedge variability in forecasted interest cash flows in our loan portfolio which is comprised primarily of floating-rate loans. These derivatives are designated as cash flow hedges.
	All derivative instruments are recorded at fair value on the Consolidated Statements of Financial Condition, after considering the effects of master netting agreements as allowed under authoritative accounting guidance.
	On the date we enter into a derivative contract, we designate the derivative instrument as a fair value hedge, cash flow hedge, or as a freestanding derivative instrument. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, that are attributable to a particular risk, such as interest rate risk, are considered to be fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in the cash flows of a recognized asset or liability, or of a forecasted transaction, that is attributable to a particular risk are considered to be cash flow hedges. We formally document all relationships between hedging instruments and hedged items, as well as our risk management objective and strategy for undertaking each hedge transaction at its inception.
	For derivative instruments that are designated and qualify as a fair value hedge and are effective, the gain or loss on the derivative instrument, as well as the offsetting loss or gain on the hedged item attributable to the hedged risk, are recognized in current earnings during the period of the change in fair values. For derivative instruments that are designated and qualify as a cash flow hedge, the effective portion of the gain or loss on the derivative instrument is reported as a component of OCI. The unrealized gain or loss is reclassified into earnings in the same period the hedged item affects earnings. For all hedge relationships, derivative gains and losses not effective in hedging the change in fair value or expected cash flows of the hedged item are recognized immediately in current earnings during the period of change. For derivatives not designated in a hedge relationship, changes in fair value are reported in current earnings during the period of change.
	At the hedge’s inception and at least quarterly thereafter, a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in the fair values or cash flows of the hedged item and whether they are expected to be highly effective in the future. If a derivative instrument designated as a hedge is terminated or ceases to be highly effective, hedge accounting is discontinued and the gain or loss is amortized to earnings over the remaining life of the hedged asset or liability (fair value hedge) or over the same period(s) that the forecasted hedged transactions impact earnings (cash flow hedge). However, if the forecasted transaction is not probable of occurring, the gain or loss is included in earnings immediately.
	The Company classifies cash flows from derivative instruments designated in a hedge relationship in the same category as the cash flows from the items being hedged as long as the derivatives do not include an other-than-insignificant financing element.
Income Taxes	Income Taxes – The Company and its subsidiaries file a consolidated Federal income tax return. The provision for income taxes is based on income reported in the Consolidated Statements of Income, rather than amounts reported on our income tax return.
	We recognize a deferred tax asset or liability for the estimated future tax effects attributable to "temporary differences." Temporary differences include differences between financial statement income and tax return income that are expected to reverse in future periods, as well as differences between the financial reporting and tax bases of assets and liabilities that are also expected to be settled in future periods. Deferred tax assets and liabilities are measured using the enacted tax rates that we expect will apply when the differences are reversed or settled. Changes in corporate income tax rates, if any, would impact the pricing of our deferred tax assets and liabilities in the period of enactment, with any changes in the valuation of deferred tax assets and liabilities reflected as an adjustment to income tax expense. A valuation allowance is recorded to reduce deferred tax assets to the amount management concludes is more likely than not to be realized.
	We periodically review and evaluate the status of uncertain tax positions and may establish tax reserves for tax benefits that may not be realized. Any income tax-related interest and penalties are included in income tax expense.
Net Earnings Per Common Share	Net Earnings Per Common Share – Basic income per common share is calculated using the two-class method. The two-class method is an earnings allocation formula that determines earnings per share for each share of common stock and participating securities according to dividends declared (distributed earnings) and participation rights in undistributed earnings. Distributed and undistributed earnings are allocated between common and participating security stockholders based on their respective rights to receive dividends. Share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities (i.e., the Company’s deferred stock units and certain restricted stock and unit awards). Undistributed net losses are not allocated to holders of participating securities, as they do not have a contractual obligation to fund the losses incurred by the Company. Net income attributable to common shares is then divided by the weighted-average number of common shares outstanding during the period, net of participating securities.
	Diluted income per common share considers common stock issuable under the assumed release of unvested restricted stock awards and units and the assumed exercise of stock options granted under the Company’s stock plans ("potentially dilutive common stock equivalents"). The dilutive effect of share-based payment awards that are not deemed to be participating securities is calculated using the treasury stock method, which assumes that the proceeds from exercise are used to purchase common stock at the average market price for the period. The dilutive effect of participating securities is calculated using the more dilutive of the treasury stock method (which assumes that the participating securities are exercised/released) or the two-class method (which assumes that the participating securities are not exercised/released and earnings are reallocated between common and participating security stockholders). Potentially dilutive common stock equivalents are excluded from the computation of diluted earnings per common share in periods in which the effect would be antidilutive.
Treasury Stock	Treasury Stock – Treasury stock acquired is recorded at cost and is carried as a reduction of equity on the Consolidated Statements of Financial Condition.
Share-Based Compensation	Share-Based Compensation – Share-based compensation cost is recognized as expense for stock options, restricted stock awards, restricted stock units, and performance share units issued to employees and non-employee directors based on the fair value of these awards at the date of grant. A binomial option-pricing model is utilized to estimate the fair value of stock options, while the closing market price of the Company’s common stock at the date of grant is used for restricted stock awards, restricted stock units and performance share units ("full value awards"). To the extent full value awards are subject to post-vesting transferability restrictions, a discount for lack of marketability may be applied to the grant date fair value. Additionally, the grant date fair value of full value awards is adjusted to reflect any market conditions that affect vesting of the awards. The costs are recognized ratably on a straight-line basis over the requisite service period, generally defined as the vesting period for the awards. For performance share units, an estimate is made as to the number of shares expected to vest as a result of actual performance against the performance criteria to determine the amount of compensation expense to be recognized. The estimate is re-evaluated quarterly and total compensation expense is adjusted for any change in the current period. When an award is granted to an employee who is retirement eligible or who will become retirement eligible prior to the end of the service period and will continue to vest after retirement, the compensation cost of these awards is recognized over the period up to the date an employee first becomes eligible to retire. The amortization of share-based compensation generally reflects estimated forfeitures adjusted for actual forfeiture experience. As compensation expense is recognized, a deferred tax asset is recorded that represents an estimate of the future tax deduction from exercise or release of restrictions. At the time share-based awards expire, are exercised or canceled, or as restrictions are released, we may be required to recognize an adjustment to stockholders’ equity or income tax expense, depending on the market price of the Company’s stock at that time and the amount of the deferred tax asset relating to such awards. Share-based compensation expense is included in "salaries and wages" in the Consolidated Statements of Income.
Comprehensive Income	Comprehensive Income – Comprehensive income consists of two components, reported net income and OCI. OCI refers to revenue, expenses, gains, and losses that are recorded as an element of equity but are excluded from reported net income. OCI consists of unrealized gains (losses) on securities available-for-sale and changes in the fair value of derivative instruments designated as cash flow hedges, net of tax.
Segment Disclosures	Segment Disclosures – An operating segment is a component of a business that (i) engages in business activities from which it may earn revenues and incur expenses; (ii) has operating results that are reviewed regularly by the entity’s chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance; and (iii) has discrete financial information available. Our chief operating decision maker evaluates the operations of the Company under three operating segments: Banking, Asset Management, and Holding Company.
Variable Interest Entities	Variable Interest Entities – A variable interest entity ("VIE") is a partnership, limited liability company, trust, or other legal entity that does not have sufficient equity to permit it to finance its activities without additional subordinated financial support from other parties, or whose investors lack one of three characteristics associated with owning a controlling financial interest. Those characteristics are: (i) the power, through voting rights or similar rights, to direct the activities of an entity that most significantly impact the entity’s economic performance, (ii) the obligation to absorb the expected losses of the entity; and (iii) the right to receive the expected residual returns of the entity.
	U.S. GAAP requires VIEs to be consolidated by the party that has a controlling financial interest in the VIE (i.e., the primary beneficiary). The Company is deemed to have a controlling financial interest and is the primary beneficiary of a VIE if it has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE.

SECURITIES_Tables

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Securities Portfolio	Securities Portfolio
	(Amounts in thousands)
		December 31,
		2014													2013
		Amortized			Gross Unrealized							Fair			Amortized		Gross Unrealized						Fair
		Cost			Gains			Losses				Value			Cost		Gains			Losses			Value
	Securities Available-for-Sale
	U.S. Treasury	$	269,697		$	120		$	(1,552	)		$	268,265		$	145,716	$	—		$	(3,141	)	$	142,575
	U.S. Agencies	46,959			—			(701		)		46,258			47,409		—			(1,881		)	45,528
	Collateralized mortgage obligations	132,633			4,334			(34		)		136,933			169,775		6,356			(15		)	176,116
	Residential mortgage-backed securities	822,746			25,058			(1,726		)		846,078			946,656		23,627			(7,176		)	963,107
	State and municipal securities	340,810			7,222			(722		)		347,310			271,135		6,627			(3,112		)	274,650
	Foreign sovereign debt	500			—			—				500			500		—			—			500
	Total	$	1,613,345		$	36,734		$	(4,735	)		$	1,645,344		$	1,581,191	$	36,610		$	(15,325	)	$	1,602,476
	Securities Held-to-Maturity
	Collateralized mortgage obligations	$	59,960		$	—		$	(2,017	)		$	57,943		$	67,335	$	—		$	(3,263	)	$	64,072
	Residential mortgage-backed securities	885,235			9,410			(2,483		)		892,162			688,410		637			(15,274		)	673,773
	Commercial mortgage-backed securities	183,021			592			(2,176		)		181,437			164,607		6			(6,640		)	157,973
	State and municipal securities	1,069			4			—				1,073			1,084		6			—			1,090
	Total	$	1,129,285		$	10,006		$	(6,676	)		$	1,132,615		$	921,436	$	649		$	(25,177	)	$	896,908
Securities in Unrealized Loss Position	Securities in Unrealized Loss Position
	(Amounts in thousands)
		Less Than 12 Months						12 Months or Longer							Total
		Fair			Unrealized			Fair				Unrealized			Fair		Unrealized
		Value			Losses			Value				Losses			Value		Losses
	As of December 31, 2014
	Securities Available-for-Sale
	U.S. Treasury	$	119,233		$	(159	)	$	123,117			$	(1,393	)	$	242,350	$	(1,552	)
	U.S. Agency	—			—			46,258				(701		)	46,258		(701		)
	Collateralized mortgage obligations	4,565			(34		)	—				—			4,565		(34		)
	Residential mortgage-backed securities	—			—			89,085				(1,726		)	89,085		(1,726		)
	State and municipal securities	53,092			(249		)	32,152				(473		)	85,244		(722		)
	Total	$	176,890		$	(442	)	$	290,612			$	(4,293	)	$	467,502	$	(4,735	)
	Securities Held-to-Maturity
	Collateralized mortgage obligations	$	—		$	—		$	57,943			$	(2,017	)	$	57,943	$	(2,017	)
	Residential mortgage-backed securities	45,867			(38		)	162,564				(2,445		)	208,431		(2,483		)
	Commercial mortgage-backed securities	10,021			(28		)	105,709				(2,148		)	115,730		(2,176		)
	Total	$	55,888		$	(66	)	$	326,216			$	(6,610	)	$	382,104	$	(6,676	)
	As of December 31, 2013
	Securities Available-for-Sale
	U.S. Treasury	$	142,575		$	(3,141	)	$	—			$	—		$	142,575	$	(3,141	)
	U.S. Agency	45,528			(1,881		)	—				—			45,528		(1,881		)
	Collateralized mortgage obligations	3,409			(15		)	—				—			3,409		(15		)
	Residential mortgage-backed securities	276,657			(7,176		)	—				—			276,657		(7,176		)
	State and municipal securities	104,442			(2,812		)	10,325				(300		)	114,767		(3,112		)
	Total	$	572,611		$	(15,025	)	$	10,325			$	(300	)	$	582,936	$	(15,325	)
	Securities Held-to-Maturity
	Collateralized mortgage obligations	$	64,072		$	(3,263	)	$	—			$	—		$	64,072	$	(3,263	)
	Residential mortgage-backed securities	556,410			(14,908		)	3,327				(366		)	559,737		(15,274		)
	Commercial mortgage-backed securities	123,021			(4,674		)	25,240				(1,966		)	148,261		(6,640		)
	Total	$	743,503		$	(22,845	)	$	28,567			$	(2,332	)	$	772,070	$	(25,177	)
Remaining Contractual Maturity of Securities	Remaining Contractual Maturity of Securities
	(Amounts in thousands)
		December 31, 2014
		Available-For-Sale Securities						Held-To-Maturity Securities
		Amortized Cost			Fair			Amortized Cost				Fair
					Value							Value
	U.S. Treasury, U.S. Agencies, state and municipal and foreign sovereign debt securities:
	One year or less	$	5,586		$	5,682		$	816			$	817
	One year to five years	460,131			461,243			253				256
	Five years to ten years	181,139			184,042			—				—
	After ten years	11,110			11,366			—				—
	All other securities:
	Collateralized mortgage obligations	132,633			136,933			59,960				57,943
	Residential mortgage-backed securities	822,746			846,078			885,235				892,162
	Commercial mortgage-backed securities	—			—			183,021				181,437
	Total	$	1,613,345		$	1,645,344		$	1,129,285			$	1,132,615
Securities Gains (Losses)	Securities Gains (Losses)
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Proceeds from sales	$	74,690		$	114,740		$	20,905
	Gross realized gains	$	615		$	1,178		$	573
	Gross realized losses	(85		)	(4		)	(778		)
	Net realized gains (losses)	$	530		$	1,174		$	(205	)	(1)
	Income tax provision (benefit) on net realized gains (losses)	$	209		$	463		$	(81	)
	(1)	Includes net losses of $520,000 in 2012 associated with certain investment funds that make qualifying investments for purposes of supporting our community reinvestment initiatives in accordance with the Community Reinvestment Act ("CRA" investments). These investments are classified in other assets in the Consolidated Statements of Financial Condition. Effective in fourth quarter 2012, net losses from these investments are recorded in other non-interest expense in the Consolidated Statements of Income.

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Loan Portfolio	Loan Portfolio
	(Amounts in thousands)
		December 31,
		2014				2013
	Commercial and industrial	$	5,996,070			$	5,360,773
	Commercial – owner-occupied commercial real estate	1,892,564				1,695,479
	Total commercial	7,888,634				7,056,252
	Commercial real estate	2,323,616				2,062,889
	Commercial real estate – multi-family	593,103				513,194
	Total commercial real estate	2,916,719				2,576,083
	Construction	381,102				293,387
	Residential real estate	361,565				341,868
	Home equity	142,177				149,732
	Personal	202,022				226,699
	Total loans	$	11,892,219			$	10,644,021
	Net deferred loan fees and unamortized discount and premium on loans, included as a reduction in total loans	$	47,017			$	37,063
	Overdrawn demand deposits included in total loans	$	1,963			$	2,772
Loans Held-for-sale	Loans Held-For-Sale
	(Amounts in thousands)
		December 31,
		2014				2013
	Mortgage loans held-for-sale (1)	$	42,215			$	17,619
	Other loans held-for-sale (2)	72,946				9,197
	Total loans held-for-sale	$	115,161			$	26,816
	(1)	Comprised of residential mortgage loan originations intended to be sold in the secondary market. The Company accounts for these loans under the fair value option. Refer to Note 20 for additional information regarding mortgage loans held-for-sale.
	(2)	Amounts at December 31, 2014 consists of $36.6 million of commercial, commercial real estate and construction loans carried at the lower of aggregate cost or fair value and $36.3 million of commercial, commercial real estate, construction, home equity and personal loans held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia, which closed in January 2015. Amounts at December 31, 2013 represent commercial loans carried at the lower of aggregate cost or fair value. Generally, the Company intends to sell these loans within 30-60 days from the date the intent to sell was established.
Carrying Value Of Loans Pledged	Carrying Value of Loans Pledged																										[1]
	(Amounts in thousands)
		December 31,
		2014				2013
	Loans pledged to secure outstanding borrowings or availability:
	FRB discount window borrowings (1)	$	478,692			$	710,269
	FHLB advances (2)	1,576,168				1,337,552
	Total	$	2,054,860			$	2,047,821
	(1)	No borrowings were outstanding at December 31, 2014 or 2013.
	(2)	Refer to Notes 10 and 11 for additional information regarding FHLB advances.
Loan Portfolio Aging	Loan Portfolio Aging																										[1]
	(Amounts in thousands)
						Delinquent
		Current				30 – 59			60 – 89				90 Days Past				Total				Nonaccrual				Total Loans
						Days Past Due			Days Past Due				Due and				Accruing
													Accruing				Loans
	As of December 31, 2014
	Commercial	$	7,855,833			$	762		$	992			$	—			$	7,857,587			$	31,047			$	7,888,634
	Commercial real estate	2,891,301				5,408			261				—				2,896,970				19,749				2,916,719
	Construction	380,939				163			—				—				381,102				—				381,102
	Residential real estate	354,717				943			631				—				356,291				5,274				361,565
	Home equity	128,500				397			2,236				—				131,133				11,044				142,177
	Personal	201,569				23			—				—				201,592				430				202,022
	Total loans	$	11,812,859			$	7,696		$	4,120			$	—			$	11,824,675			$	67,544			$	11,892,219
	As of December 31, 2013
	Commercial	$	7,031,318			$	2		$	153			$	—			$	7,031,473			$	24,779			$	7,056,252
	Commercial real estate	2,523,023				5,946			161				—				2,529,130				46,953				2,576,083
	Construction	293,387				—			—				—				293,387				—				293,387
	Residential real estate	330,922				674			296				—				331,892				9,976				341,868
	Home equity	136,341				1,108			404				—				137,853				11,879				149,732
	Personal	225,922				124			2				—				226,048				651				226,699
	Total loans	$	10,540,913			$	7,854		$	1,016			$	—			$	10,549,783			$	94,238			$	10,644,021
Impaired Loans	Impaired Loans																										[1]
	(Amounts in thousands)
		Unpaid				Recorded			Recorded				Total				Specific
		Contractual				Investment			Investment				Recorded				Reserve
		Principal				With No			With				Investment
		Balance				Specific			Specific
						Reserve			Reserve
	As of December 31, 2014
	Commercial	$	60,174			$	25,739		$	26,432			$	52,171			$	11,487
	Commercial real estate	26,738				9,755			10,193				19,948				2,441
	Residential real estate	5,849				349			4,925				5,274				735
	Home equity	12,904				3,627			8,839				12,466				1,855
	Personal	430				—			430				430				109
	Total impaired loans	$	106,095			$	39,470		$	50,819			$	90,289			$	16,627
	As of December 31, 2013
	Commercial	$	44,471			$	30,039		$	11,774			$	41,813			$	4,895
	Commercial real estate	61,112				10,301			38,203				48,504				12,536
	Residential real estate	11,823				2,629			7,347				9,976				2,412
	Home equity	13,893				2,567			10,903				13,470				2,386
	Personal	651				—			651				651				148
	Total impaired loans	$	131,950			$	45,536		$	68,878			$	114,414			$	22,377
Average Recorded Investment And Interest Income Recognized On Impaired Loans	Average Recorded Investment and Interest Income Recognized on Impaired Loans (1)
	(Amounts in thousands)
		2014							2013
		Average Recorded Investment				Interest Income			Average Recorded Investment				Interest Income Recognized
						Recognized
	Commercial	$	51,030			$	1,441		$	72,050			$	2,265
	Commercial real estate	32,256				67			64,887				428
	Residential real estate	9,281				—			11,354				3
	Home equity	12,592				88			14,665				120
	Personal	582				—			2,784				—
	Total	$	105,741			$	1,596		$	165,740			$	2,816
	(1)	Represents amounts while classified as impaired for the periods presented.
Credit Quality Indicators	Credit Quality Indicators
	(Dollars in thousands)
			Special Mention				% of Portfolio Loan		Potential Problem				% of Portfolio Loan			Non-Performing Loans				% of Portfolio Loan			Total Loans
							Type		Loans				Type							Type
	As of December 31, 2014
	Commercial		$	93,130			1.2		$	78,562			1			$	31,047			0.4			$	7,888,634
	Commercial real estate		3,552				0.1		746				*			19,749				0.7			2,916,719
	Construction		—				—		—				—			—				—			381,102
	Residential real estate		2,964				0.8		5,981				1.7			5,274				1.5			361,565
	Home equity		1,170				0.8		2,108				1.5			11,044				7.8			142,177
	Personal		173				0.1		45				*			430				0.2			202,022
	Total		$	100,989			0.8		$	87,442			0.7			$	67,544			0.6			$	11,892,219
	As of December 31, 2013
	Commercial		$	62,272			0.9		$	87,391			1.2			$	24,779			0.4			$	7,056,252
	Commercial real estate		1,016				*		4,489				0.2			46,953				1.8			2,576,083
	Construction		—				—		—				—			—				—			293,387
	Residential real estate		4,898				1.4		7,177				2.1			9,976				2.9			341,868
	Home equity		2,884				1.9		2,538				1.7			11,879				7.9			149,732
	Personal		187				0.1		177				0.1			651				0.3			226,699
	Total		$	71,257			0.7		$	101,772			1			$	94,238			0.9			$	10,644,021
	*	Less than 0.1%
Troubled Debt Restructured Loans Outstanding	Troubled Debt Restructured Loans Outstanding
	(Amounts in thousands)
		December 31,
		2014							2013
		Accruing				Nonaccrual (1)			Accruing				Nonaccrual (1)
	Commercial	$	21,124			$	20,113		$	17,635			$	6,188
	Commercial real estate	199				8,005			950				19,309
	Residential real estate	—				1,881			—				2,239
	Home equity	1,422				5,886			1,591				3,805
	Personal	—				413			—				641
	Total	$	22,745			$	36,298		$	20,176			$	32,182
	(1)	Included in nonperforming loans.
Additions To Troubled Debt Restructurings During the Period	Additions to Accruing Troubled Debt Restructurings During the Year
	(Dollars in thousands)
		Year Ended December 31, 2014										Year Ended December 31, 2013
		Number of Borrowers			Recorded Investment (1)							Number of Borrowers			Recorded Investment (1)
					Pre-Modification			Post-Modification							Pre-Modification				Post-Modification
	Commercial
	Extension of maturity date (2)	4			$	20,725		$	20,725			6			$	7,288			$	7,288
	Other concession (3)	5			21,289			21,289				—			—				—
	Total commercial	9			42,014			42,014				6			7,288				7,288
	Commercial real estate
	Extension of maturity date (2)	1			202			202				1			244				244
	Other concession (3)	1			426			426				1			717				717
	Total commercial real estate	2			628			628				2			961				961
	Residential real estate
	Extension of maturity date (2)	—			—			—				1			150				150
	Total accruing	11			$	42,642		$	42,642			9			$	8,399			$	8,399
	(1)	Represents amounts as of the date immediately prior to and immediately after the modification is effective.
	(2)	Extension of maturity date also includes loans renewed at existing rate of interest which is considered a below market rate for that particular loan’s risk profile.
	(3)	Other concessions primarily include interest rate reductions, loan increases or deferrals of principal.
	Additions to Nonaccrual Troubled Debt Restructurings During the Year
	(Dollars in thousands)
		Year Ended December 31, 2014										Year Ended December 31, 2013
		Number of Borrowers			Recorded Investment (1)							Number of Borrowers			Recorded Investment (1)
					Pre-Modification			Post-Modification							Pre-Modification				Post-Modification
	Commercial
	Extension of maturity date (2)	—			$	—		$	—			2			$	334			$	334
	Other concession (3)	10			17,900			17,822				6			1,795				1,795
	Total commercial	10			17,900			17,822				8			2,129				2,129
	Commercial real estate
	Extension of maturity date (2)	—			—			—				1			297				297
	Other concession (3)	3			2,057			2,070				10			18,562				7,475
	Total commercial real estate	3			2,057			2,070				11			18,859				7,772
	Residential real estate
	Other concession (3)	5			961			1,034				1			342				342
	Home equity
	Extension of maturity date (2)	1			114			114				5			824				824
	Other concession (3)	8			2,780			2,793				8			1,760				1,753
	Total home equity	9			2,894			2,907				13			2,584				2,577
	Personal
	Other concession (3)	—			—			—				2			478				478
	Total nonaccrual	27			$	23,812		$	23,833			35			$	24,392			$	13,298
	Change in recorded investment due to net (advances) principal paydowns at time of modification							$	(21	)									$	7,916
	Change in recorded investment due to charge-offs at time of modification							$	—										$	3,398
	(1)	Represents amounts as of the date immediately prior to and immediately after the modification is effective.
	(2)	Extension of maturity date also includes loans renewed at existing rate of interest which is considered a below market rate for that particular loan’s risk profile.
	(3)	Other concessions primarily include interest rate reductions, loan increases or deferrals of principal.
Accruing Troubled Debt Restructuring Reclassified as Nonperforming Within 12 Months Of Restructuring	Accruing Troubled Debt Restructurings
	Reclassified as Nonperforming Within 12 Months of Restructuring
	(Dollars in thousands)
		Year Ended December 31,
		2014						2013
		Number of			Recorded			Number of			Recorded
		Borrowers			Investment (1)			Borrowers			Investment (1)
	Commercial	—			$	—		1			$	149
	Commercial real estate	1			699			2			5,258
	Residential real estate	2			57			—			—
	Total	3			$	756		3			$	5,407
	(1)	Represents amounts as of the balance sheet date from the quarter the default was first reported.
[1]	Represents amounts while classified as impaired for the periods presented.

ALLOWANCE_FOR_LOAN_LOSSES_AND_1

ALLOWANCE FOR LOAN LOSSES AND RESERVE FOR UNFUNDED COMMITMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Allowance For Loan Losses And Recorded Investment In Loans	Allowance for Loan Losses and Recorded Investment in Loans
	(Amounts in thousands)
		Year Ended December 31, 2014
		Commercial			Commercial			Construction			Residential			Home			Personal			Total
					Real						Real			Equity
					Estate						Estate
	Allowance for Loan Losses:
	Balance at beginning of year	$	80,768		$	42,362		$	3,338		$	7,555		$	5,648		$	3,438		$	143,109
	Loans charged-off	(5,588		)	(6,214		)	(6		)	(1,514		)	(1,017		)	(158		)	(14,497		)
	Recoveries on loans previously charged-off	6,340			2,674			79			675			228			721			10,717
	Net recoveries (charge-offs)	752			(3,540		)	73			(839		)	(789		)	563			(3,780		)
	Provision (release) for loan losses	21,942			(6,984		)	879			(1,400		)	65			(1,333		)	13,169
	Balance at end of year	$	103,462		$	31,838		$	4,290		$	5,316		$	4,924		$	2,668		$	152,498
	Ending balance, loans individually evaluated for impairment (1)	$	11,487		$	2,441		$	—		$	735		$	1,855		$	109		$	16,627
	Ending balance, loans collectively evaluated for impairment	$	91,975		$	29,397		$	4,290		$	4,581		$	3,069		$	2,559		$	135,871
	Recorded Investment in Loans:
	Ending balance, loans individually evaluated for impairment (1)	$	52,171		$	19,948		$	—		$	5,274		$	12,466		$	430		$	90,289
	Ending balance, loans collectively evaluated for impairment	7,836,463			2,896,771			381,102			356,291			129,711			201,592			11,801,930
	Total recorded investment in loans	$	7,888,634		$	2,916,719		$	381,102		$	361,565		$	142,177		$	202,022		$	11,892,219
	(1)	Refer to Notes 1 and 4 for additional information regarding impaired loans.
	Allowance for Loan Losses and Recorded Investment in Loans (Continued)
	(Amounts in thousands)
		Year Ended December 31, 2013
		Commercial			Commercial Real Estate			Construction			Residential			Home			Personal			Total
											Real			Equity
											Estate
	Allowance for Loan Losses:
	Balance at beginning of year	$	63,709		$	73,150		$	2,434		$	9,696		$	6,797		$	5,631		$	161,417
	Loans charged-off	(22,339		)	(25,294		)	70			(3,501		)	(3,445		)	(3,725		)	(58,234		)
	Recoveries on loans previously charged-off	5,054			2,173			48			15			475			997			8,762
	Net (charge-offs) recoveries	(17,285		)	(23,121		)	118			(3,486		)	(2,970		)	(2,728		)	(49,472		)
	Provision (release) for loan losses	34,344			(7,667		)	786			1,345			1,821			535			31,164
	Balance at end of year	$	80,768		$	42,362		$	3,338		$	7,555		$	5,648		$	3,438		$	143,109
	Ending balance, loans individually evaluated for impairment (1)	$	4,895		$	12,536		$	—		$	2,412		$	2,386		$	148		$	22,377
	Ending balance, loans collectively evaluated for impairment	$	75,873		$	29,826		$	3,338		$	5,143		$	3,262		$	3,290		$	120,732
	Recorded Investment in Loans:
	Ending balance, loans individually evaluated for impairment (1)	$	41,813		$	48,504		$	—		$	9,976		$	13,470		$	651		$	114,414
	Ending balance, loans collectively evaluated for impairment	7,014,439			2,527,579			293,387			331,892			136,262			226,048			10,529,607
	Total recorded investment in loans	$	7,056,252		$	2,576,083		$	293,387		$	341,868		$	149,732		$	226,699		$	10,644,021
	(1)	Refer to Notes 1 and 4 for additional information regarding impaired loans.
	Allowance for Loan Losses and Recorded Investment in Loans (Continued)
	(Amounts in thousands)
		Year Ended December 31, 2012
		Commercial			Commercial Real Estate			Construction			Residential			Home			Personal			Total
											Real			Equity
											Estate
	Allowance for Loan Losses:
	Balance at beginning of year	$	60,663		$	94,905		$	12,852		$	6,376		$	4,022		$	12,776		$	191,594
	Loans charged-off	(31,768		)	(68,099		)	(1,979		)	(3,010		)	(3,128		)	(10,044		)	(118,028		)
	Recoveries on loans previously charged-off	4,179			8,709			2,315			126			509			1,137			16,975
	Net (charge-offs) recoveries	(27,589		)	(59,390		)	336			(2,884		)	(2,619		)	(8,907		)	(101,053		)
	Provision (release) for loan losses	30,635			37,635			(10,754		)	6,204			5,394			1,762			70,876
	Balance at end of year	$	63,709		$	73,150		$	2,434		$	9,696		$	6,797		$	5,631		$	161,417
	Ending balance, loans individually evaluated for impairment (1)	$	13,259		$	20,450		$	117		$	3,996		$	2,797		$	2,771		$	43,390
	Ending balance, loans collectively evaluated for impairment	$	50,450		$	52,700		$	2,317		$	5,700		$	4,000		$	2,860		$	118,027
	Recorded Investment in Loans:
	Ending balance, loans individually evaluated for impairment (1)	$	86,180		$	83,312		$	557		$	11,689		$	13,200		$	4,822		$	199,760
	Ending balance, loans collectively evaluated for impairment	6,410,388			2,592,589			189,939			361,891			154,560			230,855			9,940,222
	Total recorded investment in loans	$	6,496,568		$	2,675,901		$	190,496		$	373,580		$	167,760		$	235,677		$	10,139,982
	-1	Refer to Notes 1 and 4 for additional information regarding impaired loans.
Reserve For Unfunded Commitments	Reserve for Unfunded Commitments (1)
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Balance at beginning of year	$	9,206		$	7,343		$	7,277
	Provision for unfunded commitments	3,152			1,863			66
	Charge-off of unfunded commitments	(84		)	—			—
	Balance at end of year	$	12,274		$	9,206		$	7,343
	Unfunded commitments, excluding covered assets, at year end	$	6,265,506		$	5,028,268		$	4,707,373
	(1)	Unfunded commitments include commitments to extend credit, standby letters of credit and commercial letters of credit. Unfunded commitments related to covered assets are excluded as they are covered under a loss sharing agreement with the FDIC.

COVERED_ASSETS_Tables

COVERED ASSETS (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Covered Assets	Covered Assets
	(Amounts in thousands)
		December 31,
		2014								2013
		Purchased			Other		Total			Purchased			Other		Total
		Loans (1)			Assets					Loans (1)			Assets
	Commercial loans	$	—		$	—	$	—		$	11,562		$	—	$	11,562
	Commercial real estate loans	—			—		—			46,657			—		46,657
	Residential mortgage loans	32,182			—		32,182			36,883			—		36,883
	Consumer installment and other	—			—		—			3,213			259		3,472
	Foreclosed real estate	—			187		187			—			7,880		7,880
	Estimated loss reimbursement by the FDIC	—			1,763		1,763			—			6,292		6,292
	Total covered assets	32,182			1,950		34,132			98,315			14,431		112,746
	Allowance for covered loan losses	(5,191		)	—		(5,191		)	(16,511		)	—		(16,511		)
	Net covered assets	$	26,991		$	1,950	$	28,941		$	81,804		$	14,431	$	96,235
	Nonperforming covered loans (2)	$	6,828							$	15,610
	(1)	Purchased loans include $420,000 and $7.6 million of purchased impaired loans as of December 31, 2014 and 2013, respectively.
	(2)	Excludes purchased impaired loans which are accounted for on a pool basis based on common risk characteristics as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Because we are recognizing interest income on each pool of loans, all purchased impaired loans are considered to be performing.

GOODWILL_AND_OTHER_INTANGIBLE_1

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Schedule of Goodwill	Changes in the Carrying Amount of Goodwill by Reporting Unit
	(Amounts in thousands)
		Banking		Asset Management			Holding Company Activities		Consolidated
	Balance at December 31, 2012	$	81,755	$	12,766		$	—	$	94,521
	Sale of Lodestar	—		(226		)	—		(226		)
	Tax benefit adjustment	—		(254		)	—		(254		)
	Balance at December 31, 2013	81,755		12,286			—		94,041
	Tax benefit adjustment	—		—			—		—
	Balance at December 31, 2014	$	81,755	$	12,286		$	—	$	94,041
Other Intangible Assets	Other Intangible Assets
	(Amounts in thousands)
		Year Ended December 31,
		2014		2013			2012
	Core deposit intangible:
	Gross carrying amount	$	18,093	$	18,093		$	18,093
	Accumulated amortization	12,870		10,071			7,362
	Net carrying amount	$	5,223	$	8,022		$	10,731
	Amortization during the period	$	2,799	$	2,709		$	2,282
	Weighted-average remaining life (in years)	2		3			4
	Client relationships:
	Gross carrying amount	$	2,002	$	2,002		$	5,059
	Accumulated amortization	1,340		1,132			2,962
	Net carrying amount	$	662	$	870		$	2,097
	Amortization during the period	$	208	$	412		$	402
	Weighted-average remaining life (in years)	6		7			7
Scheduled Amortization Of Other Intangible Assets	Scheduled Amortization of Other Intangible Assets
	(Amounts in thousands)
		Total
	Year Ended December 31,
	2015	$	2,455
	2016	2,161
	2017	1,125
	2018	98
	2019	28
	2020 and thereafter	18
	Total	$	5,885

Premises_Furniture_And_Equipme1

Premises, Furniture, And Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule Of Premises, Furniture, And Equipment	Premises, Furniture, and Equipment
	(Amounts in thousands)
		December 31,
		2014			2013
	Land	$	1,874		$	1,874
	Building	9,980			7,581
	Leasehold improvements	37,796			39,644
	Furniture and equipment	45,346			42,044
	Software	16,363			14,421
	Total cost	111,359			105,564
	Accumulated depreciation	(72,216		)	(65,860		)
	Net book value	$	39,143		$	39,704
Schedule Of Future Minimum Rental Payments Under Operating Leases	The following summary reflects the future minimum rental payments, by year, required under operating leases that, as of December 31, 2014, have initial or remaining non-cancellable lease terms in excess of one year.
	Operating Leases (1)
	(Amounts in thousands)
		Total
	Year Ended December 31,
	2015	$	12,794
	2016	11,376
	2017	10,926
	2018	10,632
	2019	9,974
	2020 and thereafter	32,942
	Total minimum lease payments	$	88,644
	(1)	Minimum payments have not been reduced by minimum sublease rentals of $2.0 million due in the future under non-cancellable subleases.
Rental Income Expense From Premises [Table Text Block]
		Year Ended December 31,
		2014			2013			2012
	Rental expense charged to operations (1)(2)	$	12,066		$	12,224		$	12,128
	Rental income from premises leased to others (2)	$	704		$	659		$	676
	(1)	Including amounts paid under short-term cancellable leases.
	(2)	Does not include rental expense or sublease rental income for certain restructured leases.

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Summary Of Deposits	Summary of Deposits
	(Amounts in thousands)
		December 31,
		2014 (1)		2013
	Noninterest-bearing deposits	$	3,516,695	$	3,172,676
	Interest-bearing deposits	1,907,320		1,470,856
	Savings deposits	319,100		284,482
	Money market accounts	4,851,925		4,515,079
	Time deposits less than $100,000	296,899		346,812
	Time deposits of $100,000 or more	2,198,029		2,223,736
	Total deposits	$	13,089,968	$	12,013,641
	(1)	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.
Maturities Of Time Deposits Of $100,000 Or More	Maturities of Time Deposits of $100,000 or More (1)
	(Amounts in thousands)
		2014
	Maturing within 3 months	$	466,612
	After 3 but within 6 months	398,345
	After 6 but within 12 months	748,917
	After 12 months	584,155
	Total	$	2,198,029
	(1)	Excludes time deposits held-for-sale of $32.2 million as of December 31, 2014.

SHORTTERM_AND_SECURED_BORROWIN1

SHORT-TERM AND SECURED BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Summary Of Short-Term Borrowings	Summary of Short-Term Borrowings
	(Dollars in thousands)
		31-Dec-14				December 31, 2013
		Amount		Rate		Amount		Rate
	Outstanding:
	FHLB advances	$	428,000	0.13	%	$	2,000	3.37	%
	Other Information:
	Weighted-average remaining maturity of FHLB advances at year end	7 months				12 months
	Unused FHLB advances availability	$	265,529			$	395,302
	Unused overnight federal funds availability (1)	$	630,500			$	520,000
	Borrowing capacity through the FRB discount window primary credit program (2)	$	403,752			$	621,855
	(1)	Our total availability of overnight fed fund borrowings is not a committed line of credit and is dependent upon lender availability.
	(2)	Our borrowing capacity changes each quarter subject to available collateral and FRB discount factors.

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Federal Home Loan Bank, Advances [Table Text Block]	Maturity and Rate Schedule for FHLB Long-Term Advances
	(Amounts in thousands)
		December 31,							December 31,
		2014							2013
		Amount				Rate %			Amount				Rate %
	Maturity Date:
	24-Jun-15	$	—			—	%		$	1,000			3.71	%
	21-Dec-15	—				—	%		2,000				4.22	%
	December 31, 2015	—				—	%		250,000				0.09	%
	March 25, 2019	2,000				4.26	%		2,000				4.26	%
	May 22, 2019	3,000				4.68	%		3,000				4.68	%
	September 12, 2019 (1)	15,000				3.72	%		—				—	%
	September 26, 2019 (1)	15,000				3.69	%		—				—	%
	December 9, 2019 (2)	15,000				3.58	%		—				—	%
	Total	$	50,000			3.75	%		$	258,000			0.22	%
	(1)	Provides for a one-time option to increase the advances in September 2016, up to $150.0 million each at the same fixed rate as the original advance. The advances include prepayment features and are subject to a prepayment fee.
	(2)	Provides for a one-time option to increase the advances in December 2016, up to $150.0 million each at the same fixed rate as the original advance. The advances include prepayment features and are subject to a prepayment fee.
Schedule Of Long-Term Debt	Long-Term Debt
	(Dollars in thousands)
							December 31,
							2014				2013
	Parent Company:
	2.89% junior subordinated debentures due 2034			(1)(a)			$	8,248			$	8,248
	1.95% junior subordinated debentures due 2035			(2)(a)			51,547				51,547
	1.74% junior subordinated debentures due 2035			(3)(a)			41,238				41,238
	10.00% junior subordinated debentures due 2068				(a)		68,755				143,760
	7.125% subordinated debentures due 2042	(b)					125,000				125,000
	Subtotal						294,788				369,793
	Subsidiaries:
	FHLB advances						50,000				258,000
	Total long-term debt						$	344,788			$	627,793
	(1)	Variable rate in effect at December 31, 2014, based on three-month LIBOR +2.65%.
	(2)	Variable rate in effect at December 31, 2014, based on three-month LIBOR +1.71%.
	(3)	Variable rate in effect at December 31, 2014, based on three-month LIBOR +1.50%.
	(a)	Under the final regulatory capital rules issued in July 2013, these instruments are grandfathered for inclusion as a component of Tier 1 capital, although the Tier 1 capital treatment for these instruments will be subject to phase-out due to certain acquisitions.
	(b)	Qualifies as Tier 2 capital for regulatory capital purposes.
Scheduled Maturities Of Long-Term Debt	Scheduled Maturities of Long-Term Debt
	(Amounts in thousands)
		Total
	Year Ended December 31,
	2019	50,000
	2020 and thereafter	294,788
	Total	$	344,788

JUNIOR_SUBORDINATED_DEFERRABLE1

JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES HELD BY TRUSTS THAT ISSUED GUARANTEED CAPITAL DEBT SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Common Securities, Preferred Securities, And Related Debentures	Common Securities, Preferred Securities, and Related Debentures
	(Dollars in thousands)
		Issuance Date	Common Securities Issued		Trust Preferred Securities Issued (1)		Coupon Rate (2)		Earliest Redemption Date (on or after) (3)	Maturity	Principal Amount of Debentures (3)
											December 31,
											2014		2013
	Bloomfield Hills Statutory Trust I	May 2004	$	248	$	8,000	2.89	%	17-Jun-09	Jun-34	$	8,248	$	8,248
	PrivateBancorp Statutory Trust II	June 2005	1,547		50,000		1.95	%	Sept. 15, 2010	Sept. 2035	51,547		51,547
	PrivateBancorp Statutory Trust III	Dec. 2005	1,238		40,000		1.74	%	Dec. 5, 2010	Dec. 2035	41,238		41,238
	PrivateBancorp Capital Trust IV	May 2008	5		68,750		10	%	15-Jun-13	Jun-68	68,755		143,760
	Total		$	3,038	$	166,750					$	169,788	$	244,793
	(1)	The trust preferred securities accrue distributions at a rate equal to the interest rate on and have a maturity identical to that of the related Debentures. The trust preferred securities will be redeemed upon maturity or earlier redemption of the related Debentures.
	(2)	Reflects the coupon rate in effect at December 31, 2014. The coupon rate for the Bloomfield Hills Statutory Trust I is a variable rate and is based on three-month LIBOR plus 2.65%. The coupon rates for the PrivateBancorp Statutory Trusts II and III are at a variable rate based on three-month LIBOR plus 1.71% for Trust II and three-month LIBOR plus 1.50% for Trust III. The coupon rate for the PrivateBancorp Capital Trust IV is fixed. Distributions for all of the Trusts are payable quarterly. We have the right to defer payment of interest on the Debentures at any time or from time to time for a period not exceeding ten years in the case of the Debentures held by Trust IV, and five years in the case of all other Debentures, without causing an event of default under the related indenture, provided no extension period may extend beyond the stated maturity of the Debentures. During such extension period, distributions on the trust preferred securities would also be deferred, and our ability to pay dividends on our common stock would generally be prohibited. The Federal Reserve has the ability to prevent interest payments on the Debentures.
	(3)	The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the Debentures at maturity or upon their earlier redemption in whole or in part. The Debentures are redeemable in whole or in part prior to maturity at any time after the dates shown in the table and, only after we have obtained Federal Reserve approval, if then required under applicable guidelines or regulations.

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Change in Accumulated Other Comprehensive Income (AOCI) by Component [Table Text Block]	Change in Accumulated Other Comprehensive Income ("AOCI") by Component
	(Amounts in thousands)
		Year Ended December 31,
		2014									2013									2012
		Unrealized			Accumu-			Total			Unrealized			Accumu-			Total			Unrealized			Accumu-			Total
		Gain on			lated						Gain on			lated Gain						Gain on			lated Gain
		Available-			(Loss)						Available-			(Loss) on						Available-			on
		for-Sale			Gain on						for-Sale			Effective						for-Sale			Effective
		Securities			Effective						Securities			Cash Flow						Securities			Cash Flow
					Cash Flow									Hedges									Hedges
					Hedges
	Balance at beginning of year	$	12,960		$	(3,116	)	$	9,844		$	42,219		$	5,845		$	48,064		$	45,140		1,557			$	46,697
	Increase in unrealized gains (losses) on securities	11,244			—			11,244			(46,690		)	—			(46,690		)	(4,185		)	—			(4,185		)
	Increase in unrealized gains (losses) on cash flow hedges	—			16,777			16,777			—			(8,729		)	(8,729		)	—			9,945			9,945
	Tax (expense) benefit on increase in unrealized (losses) gains	(4,435		)	(6,576		)	(11,011		)	18,142			3,390			21,532			1,455			(3,883		)	(2,428		)
	Other comprehensive income (loss) before reclassifications	6,809			10,201			17,010			(28,548		)	(5,339		)	(33,887		)	(2,730		)	6,062			3,332
	Reclassification adjustment of net gains included in net income (1)	(530		)	(9,262		)	(9,792		)	(1,174		)	(5,984		)	(7,158		)	(315		)	(2,928		)	(3,243		)
	Reclassification adjustment for tax expense on realized net gains (2)	209			3,646			3,855			463			2,362			2,825			124			1,154			1,278
	Amounts reclassified from AOCI	(321		)	(5,616		)	(5,937		)	(711		)	(3,622		)	(4,333		)	(191		)	(1,774		)	(1,965		)
	Net current period other comprehensive income (loss)	6,488			4,585			11,073			(29,259		)	(8,961		)	(38,220		)	(2,921		)	4,288			1,367
	Balance at end of year	$	19,448		$	1,469		$	20,917		$	12,960		$	(3,116	)	$	9,844		$	42,219		$	5,845		$	48,064
	-1	The amounts reclassified from AOCI for the available-for-sale securities are included in net securities gains on the Consolidated Statements of Income, while the amounts reclassified from AOCI for cash flow hedges are included in interest income on loans on the Consolidated Statements of Income.
	(2)	The tax expense amounts reclassified from AOCI in connection with the available-for-sale securities reclassification and cash flow hedges reclassification are included in income tax provision on the Consolidated Statements of Income.

EARNINGS_PER_COMMON_SHARE_Tabl

EARNINGS PER COMMON SHARE (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Basic And Diluted Earnings Per Common Share	Basic and Diluted Earnings per Common Share
	(Amounts in thousands, except per share data)
		Year Ended December 31,
		2014			2013			2012
	Basic earnings per common share
	Net income	$	153,079		$	122,949		$	77,896
	Preferred stock dividends and discount accretion	—			—			(13,368		)
	Net income available to common stockholders	153,079			122,949			64,528
	Net income allocated to participating stockholders (1)	(2,134		)	(2,436		)	(1,145		)
	Net income allocated to common stockholders	$	150,945		$	120,513		$	63,383
	Weighted-average common shares outstanding	77,007			76,398			71,951
	Basic earnings per common share	$	1.96		$	1.58		$	0.88
	Diluted earnings per common share
	Diluted earnings applicable to common stockholders (2)	$	150,967		$	120,520		$	63,383
	Weighted-average diluted common shares outstanding:
	Weighted-average common shares outstanding	77,007			76,398			71,951
	Dilutive effect of stock awards (3)	815			247			223
	Weighted-average diluted common shares outstanding	77,822			76,645			72,174
	Diluted earnings per common share	$	1.94		$	1.57		$	0.88
	(1)	Participating stockholders are those that hold certain share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. Such shares or units are considered participating securities (i.e., certain of the Company’s deferred and restricted stock units and nonvested restricted stock awards).
	(2)	Net income allocated to common stockholders for basic and diluted earnings per share may differ under the two-class method as a result of adding common stock equivalents for options to dilutive shares outstanding, which alters the ratio used to allocate earnings to common stockholders and participating securities for the purposes of calculating diluted earnings per share.
	(3)	For the years ended December 31, 2014, 2013, and 2012, the weighted-average outstanding non-participating securities of 1.2 million, 2.9 million and 3.7 million shares, respectively, were not included in the computation of diluted earnings per common share because their inclusion would have been antidilutive for the periods presented.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components Of Income Taxes	Components of Income Taxes										[1]
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	86,234		$	51,169		$	31,521
	State	17,078			11,179			7,172
	Total	103,312			62,348			38,693
	Deferred tax (benefit) provision:
	Federal	(7,392		)	11,749			11,668
	State	(792		)	2,897			4,160
	Total	(8,184		)	14,646			15,828
	Total income tax provision	$	95,128		$	76,994		$	54,521
Reconciliation Of Income Tax Provision To Statutory Federal Rate	Reconciliation of Income Tax Provision to Statutory Federal Rate										[1]
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Income tax provision at statutory federal income tax rate	$	86,872		$	69,980		$	46,346
	(Decrease) increase in taxes resulting from:
	Tax exempt interest	$	(2,139	)	$	(2,158	)	$	(1,956	)
	Meals, entertainment and related expenses	621			577			483
	Bank owned life insurance	(470		)	(473		)	(542		)
	Investment credits	(331		)	(331		)	(314		)
	Non-deductible compensation	148			172			1,880
	State income taxes	10,292			8,618			6,039
	Share-based compensation charges	—			200			2,468
	Deferred tax asset adjustments	504			500			1,136
	Other	(369		)	(91		)	(1,019		)
	Total income tax provision	$	95,128		$	76,994		$	54,521
Deferred Tax Assets And Liabilities	Deferred Tax Assets and Liabilities										[1]
	(Amounts in thousands)
		December 31,
		2014			2013
	Deferred tax assets:
	Allowance for loan losses	$	64,832		$	60,090
	Share-based payment expenses	16,883			15,310
	Deferred compensation	4,285			3,950
	Loan fees	18,871			15,088
	OREO write-downs and expenses	7,008			9,281
	Nonaccrual interest income	1,874			2,505
	Covered assets – loans and OREO	4,636			8,023
	Other	3,426			5,579
	Total deferred tax assets	121,815			119,826
	Deferred tax liabilities:
	Unrealized gain on securities available-for-sale	(12,450		)	(8,305		)
	Intangible assets and acquisition adjustments	(7,504		)	(8,232		)
	Premises and equipment	(1,889		)	(1,919		)
	Covered assets – FDIC loss share receivable	(694		)	(2,482		)
	Other	(1,094		)	(243		)
	Total deferred tax liabilities	(23,631		)	(21,181		)
	Net deferred tax assets	$	98,184		$	98,645
Unrecognized Tax Benefits	Roll Forward of Unrecognized Tax Benefits										[1]
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Balance at beginning of year	$	411		$	179		$	499
	Additions for tax positions related to prior years	—			263			77
	Reductions for tax positions related to prior years	(142		)	—			(380		)
	Reductions for lapse of statute of limitations	—			(31		)	(17		)
	Balance at end of year	$	269		$	411		$	179
	Interest and penalties, net of tax effect, recognized in income tax (benefit) expense during the year	$	(6	)	$	33		$	(31	)
	Interest and penalties, net of tax effect, accrued at year end (1)	$	54		$	60		$	27
	(1)	Not included in the unrecognized tax benefits roll forward presented above.
[1]	Not included in the unrecognized tax benefits roll forward presented above.

ShareBased_Compensation_And_Ot1

Share-Based Compensation And Other Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Effect Of Recognizing Share-Based Compensation Expense	Effect of Recognizing Share-based Compensation Expense
	(Amounts in thousands)
		Year Ended December 31,
		2014				2013				2012
	Recognized share-based compensation expense:
	Stock option expense	$	3,710			$	3,648			$	7,620
	Restricted stock and unit expense (including salary stock)	10,562				8,802				13,035
	Performance share unit expense	1,296				226				—
	Total share-based compensation expense	15,568				12,676				20,655
	Income tax benefit	(6,050		)		(4,818		)		(6,755		)
	Share-based compensation expense, net of tax	$	9,518			$	7,858			$	13,900
	Unrecognized share-based compensation expense:
	Stock options	$	3,391			$	4,576			$	4,302
	Weighted-average amortization period remaining (in years)	1.6				1.8				1.8
	Restricted stock and unit expense	$	11,902			$	11,205			$	9,942
	Weighted-average amortization period remaining (in years)	1.7				1.8				1.9
	Performance share unit expense (1)	$	2,694			$	635			$	—
	Weighted-average amortization period remaining (in years)	2				2.2				0
	(1)	Based on an estimate of the number of shares expected to vest as a result of actual performance against the performance criteria at December 31, 2014 and 2013. For additional information regarding our performance share units, refer to the "Performance Share Units" section further in this Note.
Stock Option Activity	Stock Option Activity
	(Amounts in thousands, except per share data)
		Options			Weighted-Average						Aggregate
											Intrinsic
					Exercise				Remaining		Value (2)
					Price				Contractual
									Life (1)
	2012
	Outstanding at beginning of year	3,627			$	26.15
	Granted	646			14.43
	Exercised	(95	)		9.59
	Forfeited	(63	)		24.27
	Expired	(240	)		29.94
	Outstanding at end of year	3,875			$	24.4			6.1		$	1,381
	Exercisable at end of year	2,829			$	28.05			5.1		$	541
	2013
	Outstanding at beginning of year	3,875			$	24.4
	Granted	652			18.1
	Exercised	(200	)		14.52
	Forfeited	(86	)		17.43
	Expired	(151	)		34.1
	Outstanding at end of year	4,090			$	23.66			5.7		$	27,255
	Exercisable at end of year	2,890			$	26.68			4.5		$	12,220
	2014
	Outstanding at beginning of year	4,090			$	23.66
	Granted	203			27.98
	Exercised	(277	)		18.59
	Forfeited	(15	)		18.82
	Expired	(132	)		34.09
	Outstanding at end of year	3,869			$	23.92			5		$	38,163
	Exercisable at end of year	2,853			$	25.55			3.9		$	23,879
	Ending vested and expected to vest	3,771			$	23.98			4.9		$	36,999
	(1)	Represents the average contractual life remaining in years.
	(2)	Aggregate intrinsic value represents the total pretax intrinsic value of the "in-the-money" stock options, (i.e., the difference between our closing stock price on the last trading day of the respective year and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the respective year. This amount will fluctuate with changes in the fair value of our common stock.
Summary Of Stock Options Outstanding And Exercisable	Summary of Stock Options Outstanding and Exercisable
	(Number of shares in thousands)
			Outstanding Options								Exercisable Options
	Range of Exercise Price		Shares		Weighted-Average						Shares		Weighted-
													Average
													Exercise
					Remaining		Exercise						Price
					Contractual		Price
					Life (1)
	$6.92 - $14.91		583		6.7		$	13.98			398		$	13.79
	$14.92 - $18.67		1,023		7.4		16.74				415		15.02
	$18.68 - $26.37		908		3		25.98				887		26.09
	$26.38 - $32.19		746		4.8		29.61				545		30.23
	$32.20 - $46.51		609		2.8		35.43				608		35.43
	Total		3,869		5		$	23.92			2,853		$	25.55
	(1)	Represents the weighted-average contractual life remaining in years.
Stock Option Valuation Assumptions	Stock Option Valuation Assumptions
		Year Ended December 31,
		2014				2013				2012
	Expected life of the option (in years)	6				5.4 - 6.3				4.6 - 5.6
	Expected stock volatility	43.3 - 44.3%				44.0 - 45.2%				44.7 - 49.8%
	Risk-free interest rate	1.8 - 2.1%				1.0 - 2.1%				1.6 - 2.4%
	Expected dividend yield	0.1		%		0.1 - 0.2%				0.2 - 0.3%
	Weighted-average fair value of options at their grant date	$	12.2			$	7.79			$	6.52
Other Stock Option Information	Other Stock Option Information
	(Dollars in thousands)
		Year Ended December 31,
		2014				2013				2012
	Total intrinsic value of stock options exercised	$	3,204			$	1,402			$	511
	Cash received from stock options exercised	$	5,149			$	2,847			$	312
	Income tax benefit realized from stock options exercised (1)	$	1,217			$	502			$	199
	(1)	Amounts may be more or less than deferred tax benefit recorded during vesting period.
Restricted Stock And Unit Award Activity	Restricted Stock and Unit Awards Activity
	(Number of shares/units in thousands)
		Year Ended December 31,
		2014							2013						2012 (1)
		Number			Weighted-Average Grant Date Fair Value(2)				Number			Weighted-Average Grant Date Fair Value (2)			Number		Weighted-Average Grant Date Fair Value (2)
		of Shares/							of Shares/						of Shares/
		Units							Units						Units
	Nonvested restricted stock and unit awards at beginning of year	1,268			$	15.76			1,114			$	14.42		1,060		$	20.84
	Granted	431			27.15				676			17.14			841		14.41
	Vested	(577	)		15.62				(444	)		14.53			(733	)	23.37
	Forfeited	(29	)		21.51				(78	)		15.7			(54	)	18.81
	Nonvested restricted stock and unit awards at end of year	1,093			$	20.18			1,268			$	15.76		1,114		$	14.42
	Vested, but not issued at end of year (3)	164			$	16.56			136			$	16.52		110		$	16.89
	(1)	Includes 49,992 shares of salary stock awards issued in connection with compensation restrictions under the TARP CPP at an average price of $15.51 per share. The salary stock was fully vested upon issuance with all of the rights of a stockholder, including the right to vote and receive dividends but was restricted from sale or transfer for a period of 36 months after issuance, except in the event of death or disability.
	(2)	Includes the effect of the DLOM.
	(3)	Represents restricted stock units with a delayed settlement date.
Other Restricted Stock And Unit Award Information	Other Restricted Stock and Unit Award Information
	(Dollars in thousands)
		Year Ended December 31,
		2014				2013				2012
	Total fair value of vested/released restricted stock and units	$	16,135			$	7,662			$	10,674
	Current income tax benefit realized from vesting/release of restricted stock and unit awards (1)	$	6,036			$	2,714			$	2,919
	(1)	Amount may be more or less than deferred tax benefit recorded during vesting period.
Performance Share Units Activity	Performance Share Units Activity (1)
	(Number of shares/units in thousands)
		Year Ended December 31,
		2014							2013
		Number			Weighted-Average Grant Date Fair Value (2)				Number			Weighted-Average Grant Date Fair Value (2)
		of Shares/							of Shares/
		Units							Units
	Nonvested performance share unit awards at beginning of year	54			$	15.44			—			$	—
	Granted	99			26				54			15.44
	Forfeited	(3	)		26				—			—
	Nonvested performance share unit awards at end of year	150			$	22.19			54			$	15.44
	(1)	Presented at target level of performance.
	(2)	Includes the effect of a 20% DLOM on awards granted in each 2014 and 2013.
KSOP Plan Information	KSOP Plan Information
	(Amounts in thousands)
		Year Ended December 31,
		2014				2013				2012
	Company matching contribution	$	2,509			$	2,405			$	2,164
	Number of Company shares held in KSOP	373				394				411
	Fair value of Company shares held by KSOP	$	12,472			$	11,412			$	6,298
	Dividends received	$	16			$	16			$	17

Regulatory_And_Capital_Matters1

Regulatory And Capital Matters (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Capital Measurements	Capital Measurements
	(Amounts in thousands, except for ratios)
		Actual				FRB Guidelines for				Regulatory Minimum
						Minimum Regulatory				For "Well-Capitalized"
						Capital				under FDICIA
		Capital		Ratio		Capital		Ratio		Capital		Ratio
	As of December 31, 2014
	Total risk-based capital:
	Consolidated	$	1,825,542	12.51	%	$	1,167,412	8	%	n/a		n/a
	The PrivateBank	1,740,736		11.95		n/a		n/a		$	1,456,366	10	%
	Tier 1 risk-based capital:
	Consolidated	1,530,579		10.49		583,706		4		n/a		n/a
	The PrivateBank	1,570,773		10.79		n/a		n/a		873,820		6
	Tier 1 leverage:
	Consolidated	1,530,579		9.96		614,996		4		n/a		n/a
	The PrivateBank	1,570,773		10.24		n/a		n/a		767,278		5
	As of December 31, 2013
	Total risk-based capital:
	Consolidated	$	1,720,740	13.3	%	$	1,035,086	8	%	n/a		n/a
	The PrivateBank	1,637,376		12.69		n/a		n/a		$	1,290,606	10	%
	Tier 1 risk-based capital:
	Consolidated	1,433,920		11.08		517,543		4		n/a		n/a
	The PrivateBank	1,475,958		11.44		n/a		n/a		774,363		6
	Tier 1 leverage:
	Consolidated	1,433,920		10.37		552,839		4		n/a		n/a
	The PrivateBank	1,475,958		10.7		n/a		n/a		689,432		5
	n/a	Not applicable

DERIVATIVE_INSTRUMENTS_Tables

DERIVATIVE INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts and Fair Value of Derivative Instruments	Notional Amounts and Fair Value of Derivative Instruments
	(Amounts in thousands)
		Asset Derivatives												Liability Derivatives
		December 31, 2014						December 31, 2013						December 31, 2014					December 31, 2013
		Notional (1)			Fair			Notional (1)			Fair			Notional (1)		Fair			Notional (1)		Fair
					Value						Value					Value					Value
	Derivatives designated as hedging instruments:
	Interest rate contracts	$	550,000		$	4,542		$	350,000		$	4,005		$	250,000	$	2,715		$	325,000	$	9,748
	Derivatives not designated as hedging instruments:
	Client-related derivatives:
	Interest rate contracts	$	3,881,202		$	42,879		$	3,959,328		$	54,155		$	3,743,827	$	43,792		$	3,959,328	$	54,930
	Foreign exchange contracts	98,285			5,183			116,761			3,029			86,582		4,659			116,761		2,570
	Credit contracts (1)	98,478			19			91,694			34			100,941		24			113,348		98
	Total client-related derivatives				48,081						$	57,218				48,475					$	57,598
	Other end-user derivatives:
	Foreign exchange contracts	$	18,551		$	241		$	5,436		$	16		$	2,892	$	45		$	7,041	$	218
	Mortgage banking derivatives				786						341					801					103
	Total other end-user derivatives				$	1,027					$	357				$	846				$	321
	Total derivatives not designated as hedging instruments				$	49,108					$	57,575				$	49,321				$	57,919
	Netting adjustments (2)				(10,588		)				(13,158		)			(25,269		)			(18,777		)
	Total derivatives				$	43,062					$	48,422				$	26,767				$	48,890
	(1)	The remaining average notional amounts are shown for credit contracts.
	(2)	Represents netting of derivative asset and liability balances, and related cash collateral, with the same counterparty subject to master netting agreements.
Offsetting of Derivative Assets	Offsetting of Derivative Assets and Liabilities
	(Amounts in thousands)
		Gross Amounts of Recognized Assets / Liabilities (1)			Gross Amounts Offset (2)			Net Amount Presented on the Statement of Financial Condition			Gross Amounts Not Offset on the Statement of Financial Condition (3)
											Financial Instruments (4)			Cash Collateral		Net Amount
	As of December 31, 2014
	Derivative assets
	Interest rate contracts	$	47,421		$	(7,433	)	$	39,988		$	—		$	—	$	39,988
	Foreign exchange contracts	3,664			(3,154		)	510			—			—		510
	Credit contracts	19			(1		)	18			—			—		18
	Total derivatives subject to a master netting agreement	51,104			(10,588		)	40,516			—			—		40,516
	Total derivatives not subject to a master netting agreement	2,546			—			2,546			—			—		2,546
	Total derivatives	$	53,650		$	(10,588	)	$	43,062		$	—		$	—	$	43,062
	Derivative liabilities
	Interest rate contracts	$	46,507		$	(24,067	)	$	22,440		$	(17,755	)	$	—	$	4,685
	Foreign exchange contracts	2,421			(1,202		)	1,219			(965		)	—		254
	Credit contracts	24			—			24			(19		)	—		5
	Total derivatives subject to a master netting agreement	48,952			(25,269		)	23,683			(18,739		)	—		4,944
	Total derivatives not subject to a master netting agreement	3,084			—			3,084			—			—		3,084
	Total derivatives	$	52,036		$	(25,269	)	$	26,767		$	(18,739	)	$	—	$	8,028
	(1)	All derivative contracts are over-the-counter contracts.
	(2)	Represents end-user, client-related and cash flow hedging derivative contracts and related cash collateral entered into with the same counterparty and subject to a master netting agreement.
	(3)	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
	(4)	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.
	Offsetting of Derivative Assets and Liabilities (Continued)
	(Amounts in thousands)
		Gross Amounts of Recognized Assets / Liabilities (1)			Gross Amounts Offset (2)			Net Amount Presented on the Statement of Financial Condition			Gross Amounts Not Offset on the Statement of Financial Condition (3)
											Financial Instruments (4)			Cash Collateral		Net Amount
	As of December 31, 2013
	Derivative assets
	Interest rate contracts	$	58,160		$	(12,371	)	$	45,789		$	—		$	—	$	45,789
	Foreign exchange contracts	1,298			(767		)	531			—			—		531
	Credit contracts	34			(20		)	14			—			—		14
	Total derivatives subject to a master netting agreement	59,492			(13,158		)	46,334			—			—		46,334
	Total derivatives not subject to a master netting agreement	2,088			—			2,088			—			—		2,088
	Total derivatives	$	61,580		$	(13,158	)	$	48,422		$	—		$	—	$	48,422
	Derivative liabilities
	Interest rate contracts	$	64,678		$	(17,990	)	$	46,688		$	(41,192	)	$	—	$	5,496
	Foreign exchange contracts	2,462			(767		)	1,695			(1,495		)	—		200
	Credit contracts	98			(20		)	78			(69		)	—		9
	Total derivatives subject to a master netting agreement	67,238			(18,777		)	48,461			(42,756		)	—		5,705
	Total derivatives not subject to a master netting agreement	429			—			429			—			—		429
	Total derivatives	$	67,667		$	(18,777	)	$	48,890		$	(42,756	)	$	—	$	6,134
	(1)	All derivative contracts are over-the-counter contracts.
	(2)	Represents end-user, client-related and cash flow hedging derivative contracts entered into with the same counterparty and subject to a master netting agreement.
	(3)	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
	(4)	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.
Offsetting of Derivative Liabilities	Offsetting of Derivative Assets and Liabilities
	(Amounts in thousands)
		Gross Amounts of Recognized Assets / Liabilities (1)			Gross Amounts Offset (2)			Net Amount Presented on the Statement of Financial Condition			Gross Amounts Not Offset on the Statement of Financial Condition (3)
											Financial Instruments (4)			Cash Collateral		Net Amount
	As of December 31, 2014
	Derivative assets
	Interest rate contracts	$	47,421		$	(7,433	)	$	39,988		$	—		$	—	$	39,988
	Foreign exchange contracts	3,664			(3,154		)	510			—			—		510
	Credit contracts	19			(1		)	18			—			—		18
	Total derivatives subject to a master netting agreement	51,104			(10,588		)	40,516			—			—		40,516
	Total derivatives not subject to a master netting agreement	2,546			—			2,546			—			—		2,546
	Total derivatives	$	53,650		$	(10,588	)	$	43,062		$	—		$	—	$	43,062
	Derivative liabilities
	Interest rate contracts	$	46,507		$	(24,067	)	$	22,440		$	(17,755	)	$	—	$	4,685
	Foreign exchange contracts	2,421			(1,202		)	1,219			(965		)	—		254
	Credit contracts	24			—			24			(19		)	—		5
	Total derivatives subject to a master netting agreement	48,952			(25,269		)	23,683			(18,739		)	—		4,944
	Total derivatives not subject to a master netting agreement	3,084			—			3,084			—			—		3,084
	Total derivatives	$	52,036		$	(25,269	)	$	26,767		$	(18,739	)	$	—	$	8,028
	(1)	All derivative contracts are over-the-counter contracts.
	(2)	Represents end-user, client-related and cash flow hedging derivative contracts and related cash collateral entered into with the same counterparty and subject to a master netting agreement.
	(3)	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
	(4)	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.
	Offsetting of Derivative Assets and Liabilities (Continued)
	(Amounts in thousands)
		Gross Amounts of Recognized Assets / Liabilities (1)			Gross Amounts Offset (2)			Net Amount Presented on the Statement of Financial Condition			Gross Amounts Not Offset on the Statement of Financial Condition (3)
											Financial Instruments (4)			Cash Collateral		Net Amount
	As of December 31, 2013
	Derivative assets
	Interest rate contracts	$	58,160		$	(12,371	)	$	45,789		$	—		$	—	$	45,789
	Foreign exchange contracts	1,298			(767		)	531			—			—		531
	Credit contracts	34			(20		)	14			—			—		14
	Total derivatives subject to a master netting agreement	59,492			(13,158		)	46,334			—			—		46,334
	Total derivatives not subject to a master netting agreement	2,088			—			2,088			—			—		2,088
	Total derivatives	$	61,580		$	(13,158	)	$	48,422		$	—		$	—	$	48,422
	Derivative liabilities
	Interest rate contracts	$	64,678		$	(17,990	)	$	46,688		$	(41,192	)	$	—	$	5,496
	Foreign exchange contracts	2,462			(767		)	1,695			(1,495		)	—		200
	Credit contracts	98			(20		)	78			(69		)	—		9
	Total derivatives subject to a master netting agreement	67,238			(18,777		)	48,461			(42,756		)	—		5,705
	Total derivatives not subject to a master netting agreement	429			—			429			—			—		429
	Total derivatives	$	67,667		$	(18,777	)	$	48,890		$	(42,756	)	$	—	$	6,134
	(1)	All derivative contracts are over-the-counter contracts.
	(2)	Represents end-user, client-related and cash flow hedging derivative contracts entered into with the same counterparty and subject to a master netting agreement.
	(3)	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
	(4)	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.
Derivatives Subject To Credit Risk Contingency Features	Derivatives Subject to Credit Risk Contingency Features
	(Amounts in thousands)
		December 31,
		2014			2013
	Fair value of derivatives with credit contingency features in a net liability position	$	14,596		$	28,152
	Collateral posted for those transactions in a net liability position	$	16,865		$	30,272
	If credit risk contingency features were triggered:
	Additional collateral required to be posted to derivative counterparties	$	—		$	—
	Outstanding derivative instruments that would be immediately settled	$	14,596		$	28,152
Change In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedge	Change in Accumulated Other Comprehensive Income
	Related to Interest Rate Swaps Designated as Cash Flow Hedge
	(Amounts in thousands)
		Year Ended December 31,
		2014						2013
		Pre-tax			After-tax			Pre-tax			After-tax
	Accumulated unrealized (loss) gain at beginning of year	$	(5,110	)	$	(3,116	)	$	9,603		$	5,845
	Amount of gain (loss) recognized in AOCI (effective portion)	16,777			10,201			(8,729		)	(5,339		)
	Amount reclassified from AOCI to interest income on loans	(9,262		)	(5,616		)	(5,984		)	(3,622		)
	Accumulated unrealized gain (loss) at end of year	$	2,405		$	1,469		$	(5,110	)	$	(3,116	)
Risk Participation Agreements	Risk Participation Agreements
	(Dollars in thousands)
		December 31,
		2014			2013
	Fair value of written RPAs	$	24		$	98
	Range of remaining terms to maturity (in years)	Less than 1 to 4			Less than 1 to 4
	Range of assigned internal risk ratings	2 to 7			2 to 7
	Maximum potential amount of future undiscounted payments	$	3,927		$	3,263
	Percent of maximum potential amount of future undiscounted payments covered by proceeds from liquidation of pledged collateral	25		%	16		%
Gain (Loss) Recognized On Derivative Instruments Not Designated In Hedging Relationship	Gain (Loss) Recognized on Derivative Instruments
	Not Designated in Hedging Relationship
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Gain on client-related derivatives recognized in capital markets products income:
	Interest rate contracts	$	10,634		$	14,226		$	19,613
	Foreign exchange contracts	7,068			6,506			6,024
	Credit contracts	345			(4		)	321
	Total client-related derivatives	18,047			20,728			25,958
	Gain (loss) on end-user derivatives recognized in other income:
	Foreign exchange derivatives	1,402			125			(336		)
	Mortgage banking derivatives	(253		)	235			123
	Total end-user derivatives	1,149			360			(213		)
	Total gain recognized on derivatives not designated in hedging relationship	$	19,196		$	21,088		$	25,745

COMMITMENTS_GUARANTEES_AND_CON1

COMMITMENTS, GUARANTEES, AND CONTINGENT LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Schedule Of Commitments Guarantees And Contingent Liabilities	Contractual or Notional Amounts of Financial Instruments (1)
	(Amounts in thousands)
		December 31,
		2014		2013
	Commitments to extend credit:
	Home equity lines	$	129,943	$	139,116
	Residential 1-4 family construction	53,847		32,714
	Commercial real estate, other construction, and land development	1,123,123		703,382
	Commercial and industrial	4,255,422		3,609,443
	All other commitments	336,623		222,337
	Total commitments to extend credit	$	5,898,958	$	4,706,992
	Letters of credit:
	Financial standby	$	334,175	$	308,577
	Performance standby	38,167		26,932
	Commercial letters of credit	5,224		4,500
	Total letters of credit	$	377,566	$	340,009
	(1)	Includes covered loan commitments of $11.0 million and $18.7 million as of December 31, 2014 and 2013, respectively.

ESTIMATED_FAIR_VALUE_OF_FINANC1

ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Fair Value Measurements on a Recurring Basis	Fair Value Measurements on a Recurring Basis
	(Amounts in thousands)
		31-Dec-14														December 31, 2013
		Quoted				Significant			Significant				Total			Quoted		Significant			Significant			Total
		Prices in				Other			Unobservable							Prices in		Other			Unobservable
		Active				Observable			Inputs							Active		Observable			Inputs
		Markets				Inputs			(Level 3)							Markets		Inputs			(Level 3)
		for Identical				(Level 2)										for Identical		(Level 2)
		Assets														Assets
		(Level 1)														(Level 1)
	Assets:
	Securities available-for-sale:
	U.S. Treasury	$	268,265			$	—		$	—			$	268,265		$	142,575	$	—		$	—		$	142,575
	U.S. Agencies	—				46,258			—				46,258			—		45,528			—			45,528
	Collateralized mortgage obligations	—				136,933			—				136,933			—		176,116			—			176,116
	Residential mortgage-backed securities	—				846,078			—				846,078			—		963,107			—			963,107
	State and municipal securities	—				347,310			—				347,310			—		274,650			—			274,650
	Foreign sovereign debt	—				500			—				500			—		500			—			500
	Total securities available-for-sale	268,265				1,377,079			—				1,645,344			142,575		1,459,901			—			1,602,476
	Mortgage loans held-for-sale	—				42,215			—				42,215			—		17,619			—			17,619
	Derivative assets:
	Interest rate contract derivatives designated as hedging instruments	—				4,542			—				4,542			—		4,005			—			4,005
	Client-related derivatives	—				46,669			1,412				48,081			—		56,770			448			57,218
	Other end-user derivatives	—				1,027			—				1,027			—		357			—			357
	Netting adjustments	—				(9,952		)	(636		)		(10,588		)	—		(13,138		)	(20		)	(13,158		)
	Total derivative assets	—				42,286			776				43,062			—		47,994			428			48,422
	Total assets	$	268,265			$	1,461,580		$	776			$	1,730,621		$	142,575	$	1,525,514		$	428		$	1,668,517
	Liabilities:
	Derivative liabilities:
	Interest rate contract derivatives designated as hedging instruments	$	—			$	2,715		$	—			$	2,715		$	—	$	9,748		$	—		$	9,748
	Client-related derivatives	—				47,799			676				48,475			—		57,500			98			57,598
	Other end-user derivatives	—				846			—				846			—		321			—			321
	Netting adjustments	—				(24,633		)	(636		)		(25,269		)	—		(18,757		)	(20		)	(18,777		)
	Total derivative liabilities	$	—			$	26,727		$	40			$	26,767		$	—	$	48,812		$	78		$	48,890
Reconciliation of Beginning and Ending Fair Value for Those Fair Value Measurements Using Significant Unobservable Inputs (Level 3)	Reconciliation of Beginning and Ending Fair Value for Those
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (1)
	(Amounts in thousands)
		December 31, 2014							December 31, 2013
		Derivative Assets				Derivative (Liabilities)			Derivative Assets				Derivative (Liabilities)
	Balance at beginning of year	$	448			$	(98	)	$	1,023			$	(60	)
	Total gains (losses):
	Included in earnings (2)	455				660			126				(14		)
	Purchases, issuances, sales and settlements:
	Issuances	—				—			—				(51		)
	Settlements	(1,487		)		(24		)	(841		)		—
	Transfers into Level 3 (out of Level 2) (3)	2,717				(1,411		)	575				—
	Transfers out of Level 3 (into Level 2) (3)	(721		)		197			(435		)		27
	Balance at end of year	$	1,412			$	(676	)	$	448			$	(98	)
	Change in unrealized gains (losses) in earnings relating to assets and liabilities still held at end of year	$	353			$	102		$	(19	)		$	(21	)
	(1)	Fair value is presented prior to giving effect to netting adjustments.
	(2)	Amounts disclosed in this line are included in the Consolidated Statements of Income as capital markets products income for derivatives.
	(3)	Transfers in and transfers out are recognized at the end of each quarterly reporting period. In general, derivative assets and liabilities are transferred into Level 3 from Level 2 due to a lack of observable market data, as there was deterioration in the credit risk of the derivative counterparty. Conversely, derivative assets and liabilities are transferred out of Level 3 into Level 2 due to an improvement in the credit risk of the derivative counterparty.
Difference Between Aggregate Fair Value And Aggregate Remaining Principle Balance For Mortgage Loans Held-For-Sale Elected to be Carried At Fair Value	Difference Between Aggregate Fair Value and Aggregate Remaining Principal Balance
	for Mortgage Loans Held-For-Sale Elected to be Carried at Fair Value
	(Amounts in thousands)
		December 31,
		2014				2013
	Aggregate fair value	$	42,215			$	17,619
	Difference (1)	(16		)		238
	Aggregate unpaid principal balance	$	42,199			$	17,857
	(1)	The change in fair value is reflected in mortgage banking non-interest income.
Fair Value Measurements on a Nonrecurring Basis	Fair Value Measurements on a Nonrecurring Basis
	(Amounts in thousands)
		Fair Value							Losses
		December 31,							For the Year Ended
		2014				2013			2014				2013
	Collateral-dependent impaired loans (1)	$	34,192			$	45,937		$	5,440			$	4,656
	Covered assets - OREO (2) (3)	143				6,044			5				532
	OREO (2)	8,657				18,764			5,817				12,711
	Total	$	42,992			$	70,745		$	11,262			$	17,899
	(1)	Represents the fair value of loans adjusted to the appraised value of the collateral with a write-down in fair value or change in specific reserves during the respective period. These fair value adjustments are recorded against the allowance for loan losses.
	(2)	Represents the fair value of foreclosed properties that were adjusted subsequent to their initial classification as foreclosed assets. Write-downs are recognized as a component of net foreclosed real estate expense in the Consolidated Statements of Income.
	(3)	The 20% portion of any covered asset OREO write-down not reimbursed by the FDIC is recorded as net foreclosed real estate expense.
Quantitative Information Regarding Level 3 Fair Value Measurements	Quantitative Information Regarding Level 3 Fair Value Measurements
	(Dollars in thousands)
	Financial Instrument:	Fair Value				Valuation Technique(s)		Unobservable	Range		Weighted
		of Assets						Input			Average
		(Liabilities) at
		December 31,
		2014
	Watch list derivatives	$	741			Discounted cash flow		Loss factors	4.3% to 16.0%		15.4	%
	Risk participation agreements	$	(5	)	(1)	Discounted cash flow		Loss factors	0.6% to 16.0%		4.7	%
	Collateral-dependent impaired loans	$	34,192			Sales comparison,		Property specific	-1.2% to -34.7%		-21.9	%	(2)
						income capitalization		adjustment
						and/or cost approach
	OREO	$	8,657			Sales comparison,		Property specific	-0.1% to -100.0%		-19.1	%	(2)
						income capitalization		adjustment
						and/or cost approach
	(1)	Represents fair value of underlying swap.
	(2)	Weighted average is calculated based on assets with a property specific adjustment.
Financial Instruments	Financial Instruments
	(Amounts in thousands)
		As of December 31, 2014
		Carrying Amount							Fair Value Measurements Using
						Fair Value			Level 1				Level 2			Level 3
	Financial Assets:
	Cash and due from banks	$	132,211			$	132,211		$	132,211			$	—		$	—
	Federal funds sold and interest-bearing deposits in banks	292,341				292,341			—				292,341			—
	Loans held-for-sale	115,161				115,161			—				115,161			—
	Securities available-for-sale	1,645,344				1,645,344			268,265				1,377,079			—
	Securities held-to-maturity	1,129,285				1,132,615			—				1,132,615			—
	FHLB stock	28,666				28,666			—				28,666			—
	Loans, net of allowance for loan losses and unearned fees	11,739,721				11,736,461			—				—			11,736,461
	Covered assets, net of allowance for covered loan losses	28,941				33,988			—				—			33,988
	Accrued interest receivable	40,531				40,531			—				—			40,531
	Investment in BOLI	55,207				55,207			—				—			55,207
	Derivative assets	43,062				43,062			—				42,286			776
	Financial Liabilities:
	Deposits	$	13,089,968			$	13,095,657		$	—			$	10,595,040		$	2,500,617
	Deposits held-for-sale	122,216				117,572							117,572
	Short-term and other borrowings	432,385				430,944			—				427,150			3,794
	Long-term debt	344,788				332,374			204,320				54,092			73,962
	Accrued interest payable	6,948				6,948			—				—			6,948
	Derivative liabilities	26,767				26,767			—				26,727			40
	Financial Instruments (Continued)
	(Amounts in thousands)
		As of December 31, 2013
		Carrying Amount							Fair Value Measurements Using
						Fair Value			Level 1				Level 2			Level 3
	Financial Assets:
	Cash and due from banks	$	133,518			$	133,518		$	133,518			$	—		$	—
	Federal funds sold and interest-bearing deposits in banks	306,544				306,544			—				306,544			—
	Loans held-for-sale	26,816				26,816			—				26,816			—
	Securities available-for-sale	1,602,476				1,602,476			142,575				1,459,901			—
	Securities held-to-maturity	921,436				896,908			—				896,908			—
	FHLB stock	30,005				30,005			—				30,005			—
	Loans, net of allowance for loan losses and unearned fees	10,500,912				10,484,250			—				—			10,484,250
	Covered assets, net of allowance for covered loan losses	96,235				113,593			—				—			113,593
	Accrued interest receivable	37,004				37,004			—				—			37,004
	Investment in BOLI	53,865				53,865			—				—			53,865
	Derivative assets	48,422				48,422			—				47,994			428
	Financial Liabilities:
	Deposits	$	12,013,641			$	12,024,079		$	—			$	9,443,094		$	2,580,985
	Short-term borrowings	8,400				8,513			—				2,060			6,453
	Long-term debt	627,793				598,260			267,360				256,825			74,075
	Accrued interest payable	6,326				6,326			—				—			6,326
	Derivatives liabilities	48,890				48,890			—				48,812			78

OPERATING_SEGMENTS_Tables

OPERATING SEGMENTS (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Operating Segments Performance	Operating Segments Performance
	(Amounts in thousands)
	Year Ended December 31,	Banking		Asset Management		Holding Company			Consolidated
						and Other
						Adjustments (1)
	2014
	Net interest income (loss)	$	481,084	$	3,363	$	(29,710	)	$	454,737
	Provision for loan and covered loan losses	12,044		—		—			12,044
	Non-interest income	100,259		17,271		60			117,590
	Non-interest expense	284,726		16,554		10,796			312,076
	Income (loss) before income taxes	284,573		4,080		(40,446		)	248,207
	Income tax provision (benefit)	109,088		1,606		(15,566		)	95,128
	Net income (loss)	$	175,485	$	2,474	$	(24,880	)	$	153,079
	Assets	$	13,882,805	$	—	$	1,720,577		$	15,603,382
	Total loans	11,892,219		—		—			11,892,219
	Deposits, excluding deposits held-for-sale	13,150,600		—		(60,632		)	13,089,968
	2013
	Net interest income (loss)	$	446,556	$	3,326	$	(28,819	)	$	421,063
	Provision for loan and covered loan losses	31,796		—		—			31,796
	Non-interest income	95,344		18,387		259			113,990
	Non-interest expense	271,911		17,832		13,571			303,314
	Income (loss) before income taxes	238,193		3,881		(42,131		)	199,943
	Income tax provision (benefit)	91,402		1,532		(15,940		)	76,994
	Net income (loss)	$	146,791	$	2,349	$	(26,191	)	$	122,949
	Assets	$	12,465,063	$	—	$	1,620,683		$	14,085,746
	Total loans	10,644,021		—		—			10,644,021
	Deposits	12,069,583		—		(55,942		)	12,013,641
	2012
	Net interest income (loss)	$	438,406	$	3,067	$	(21,540	)	$	419,933
	Provision for loan and covered loan losses	71,425		—		—			71,425
	Non-interest income	93,943		17,018		80			111,041
	Non-interest expense	285,272		17,386		24,474			327,132
	Income (loss) before income taxes	175,652		2,699		(45,934		)	132,417
	Income tax provision (benefit)	67,578		1,064		(14,121		)	54,521
	Net income (loss)	$	108,074	$	1,635	$	(31,813	)	$	77,896
	Assets	$	12,552,897	$	—	$	1,504,618		$	14,057,515
	Total loans	10,139,982		—		—			10,139,982
	Deposits	12,251,614		—		(77,980		)	12,173,634
	(1)	Deposit amounts represent the elimination of Holding Company cash accounts included in total deposits of the Banking segment.

VARIABLE_INTEREST_ENTITIES_Tab

VARIABLE INTEREST ENTITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Schedule of Nonconsolidated Variable Interest Entities	Nonconsolidated VIEs
	(Amounts in thousands)
		31-Dec-14				31-Dec-13
		Carrying		Maximum		Carrying		Maximum
		Amount		Exposure		Amount		Exposure
				to Loss				to Loss
	Trust preferred capital securities issuances	$	169,788	$	—	$	244,793	$	—
	Community reinvestment investments	14,360		16,054		7,889		9,813
	Restructured loans to commercial clients (1):
	Outstanding loan balance	49,376		57,782		43,481		48,975
	Related derivative asset	6,533		6,533		—		—
	Total	$	240,057	$	80,369	$	296,163	$	58,788
	(1)	Excludes personal loans and loans to non-for-profit entities.

Condensed_Parent_Company_Finan1

Condensed Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Statements Of Financial Condition	Statements of Financial Condition
	(Parent Company only)
	(Amounts in thousands)
		December 31,
		2014			2013
	Assets
	Cash and interest-bearing deposits	$	60,632		$	55,942
	Investment in and advances to subsidiaries	1,694,699			1,591,778
	Other assets	25,879			28,904
	Total assets	$	1,781,210		$	1,676,624
	Liabilities and Equity
	Long-term debt	$	294,788		$	369,793
	Accrued expenses and other liabilities	4,743			4,927
	Equity	1,481,679			1,301,904
	Total liabilities and equity	$	1,781,210		$	1,676,624
Statements Of Income	Statements of Income
	(Parent Company only)
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Income
	Dividends from subsidiaries	$	100,000		$	—		$	—
	Interest income	3			3			11
	Securities transactions and other income	60			259			80
	Total income	100,063			262			91
	Expenses
	Interest expense	26,348			25,493			18,471
	Salaries and employee benefits	5,672			8,235			19,721
	Other expenses	5,123			5,336			4,754
	Total expenses	37,143			39,064			42,946
	Income (loss) before income taxes and equity in undistributed income of subsidiaries	62,920			(38,802		)	(42,855		)
	Income tax benefit	14,242			14,627			12,908
	Income (loss) before undistributed income of subsidiaries	77,162			(24,175		)	(29,947		)
	Equity in undistributed income of subsidiaries	75,917			147,124			107,843
	Net income	153,079			122,949			77,896
	Preferred stock dividend	—			—			13,368
	Net income available to common stockholders	$	153,079		$	122,949		$	64,528
Statements Of Cash Flows	Statements of Cash Flows
	(Parent Company only)
	(Amounts in thousands)
		Year Ended December 31,
		2014			2013			2012
	Operating Activities
	Net income	$	153,079		$	122,949		$	77,896
	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in undistributed income from subsidiaries	(75,917		)	(147,124		)	(107,843		)
	Share-based compensation expense	2,072			4,366			16,453
	Depreciation of premises, furniture and equipment	43			139			259
	Excess tax benefit from exercise of stock options and vesting of restricted shares	(1,147		)	(425		)	(118		)
	Net decrease in other assets	3,484			1,011			5,574
	Net (decrease) increase in other liabilities	(209		)	(714		)	661
	Net cash provided by (used in) operating activities	81,405			(19,798		)	(7,118		)
	Investing Activities	—			—			—
	Financing Activities
	Proceeds from the issuance of long-term debt	—			—			125,000
	Payments for the redemption of preferred stock	—			—			(243,815		)
	Payments for the redemption of common stock warrant	—			—			(1,225		)
	Net proceeds from the issuance of common stock	—			—			70,657
	Repayment of long-term debt	(75,005		)	—			—
	Stock repurchased in connection with benefit plans	(5,330		)	(2,522		)	(2,696		)
	Cash dividends paid	(3,125		)	(3,119		)	(13,082		)
	Proceeds from exercise of stock options and issuance of common stock under benefit plans	5,598			2,976			479
	Excess tax benefit from exercise of stock options and vesting of restricted shares	1,147			425			118
	Net cash used in financing activities	(76,715		)	(2,240		)	(64,564		)
	Net increase (decrease) in cash and cash equivalents	4,690			(22,038		)	(71,682		)
	Cash and cash equivalents at beginning of year	55,942			77,980			149,662
	Cash and cash equivalents at end of year	$	60,632		$	55,942		$	77,980

Quarterly_Earnings_Performance1

Quarterly Earnings Performance (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information	Quarterly Earnings Performance (1)
	(Dollars in thousands, except per share data)
		2014												2013
		Fourth			Third			Second			First			Fourth			Third			Second			First
	Interest income	$	135,978		$	134,300		$	128,951		$	125,158		$	125,620		$	123,577		$	121,632		$	121,409
	Interest expense	19,102			17,542			16,600			16,406			17,164			17,742			17,900			18,369
	Net interest income	116,876			116,758			112,351			108,752			108,456			105,835			103,732			103,040
	Provision for loan and covered loan losses	4,120			3,890			327			3,707			4,476			8,120			8,843			10,357
	Fee revenue	30,426			30,666			30,063			25,905			26,461			27,655			28,873			29,827
	Net securities gains	—			3			196			331			279			118			136			641
	Non-interest expense	83,025			77,836			75,465			75,750			75,827			71,269			77,255			78,963
	Income before income taxes	60,157			65,701			66,818			55,531			54,893			54,219			46,643			44,188
	Income tax provision	22,934			25,174			25,994			21,026			21,187			21,161			17,728			16,918
	Net income	$	37,223		$	40,527		$	40,824		$	34,505		$	33,706		$	33,058		$	28,915		$	27,270
	Basic earnings per share	$	0.48		$	0.52		$	0.52		$	0.44		$	0.43		$	0.42		$	0.37		$	0.35
	Diluted earnings per share	$	0.47		$	0.51		$	0.52		$	0.44		$	0.43		$	0.42		$	0.37		$	0.35
	Return on average common equity	10.03		%	11.27		%	11.88		%	10.48		%	10.28		%	10.43		%	9.28		%	9.01		%
	Return on average assets	0.95		%	1.09		%	1.14		%	1		%	0.96		%	0.96		%	0.86		%	0.81		%
	Net interest margin – tax-equivalent	3.07		%	3.23		%	3.21		%	3.23		%	3.18		%	3.18		%	3.22		%	3.19		%
	(1)	All ratios are presented on an annualized basis.

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Detail)	12 Months Ended
	Dec. 31, 2014
accountingpolicy [Line Items]
Loss Rates, Allowance Methodology, Loss Experience by Product, Period	12 months
Minimum [Member]
accountingpolicy [Line Items]
Intangible assets amortized estimated useful lives	8 years
Maximum [Member]
accountingpolicy [Line Items]
Intangible assets amortized estimated useful lives	12 years
Building [Member] | Minimum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Building [Member] | Maximum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Leasehold Improvements [Member] | Minimum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Leasehold Improvements [Member] | Maximum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	16 years
Equipment [Member] | Minimum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment [Member] | Maximum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Software [Member] | Minimum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software [Member] | Maximum [Member]
accountingpolicy [Line Items]
Property, Plant and Equipment, Useful Life	5 years

Securities_Securities_Portfoli

Securities (Securities Portfolio) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	$1,613,345	$1,581,191
Securities Available-for-Sale, Gross Unrealized Gains	36,734	36,610
Securities Available-for-Sale, Gross Unrealized Losses	-4,735	-15,325
Securities available-for-sale	1,645,344	1,602,476
Securities held-to-maturity, Carrying Amount	1,129,285	921,436
Securities Held-to-Maturity, Gross Unrealized Gains	10,006	649
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-6,676	-25,177
Securities held-to-maturity, fair value	1,132,615	896,908
U.S. Treasury Securities [Member]
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	269,697	145,716
Securities Available-for-Sale, Gross Unrealized Gains	120	0
Securities Available-for-Sale, Gross Unrealized Losses	-1,552	-3,141
Securities available-for-sale	268,265	142,575
U.S. Agencies Securities [Member]
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	46,959	47,409
Securities Available-for-Sale, Gross Unrealized Gains	0	0
Securities Available-for-Sale, Gross Unrealized Losses	-701	-1,881
Securities available-for-sale	46,258	45,528
Collateralized Mortgage Obligations [Member]
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	132,633	169,775
Securities Available-for-Sale, Gross Unrealized Gains	4,334	6,356
Securities Available-for-Sale, Gross Unrealized Losses	-34	-15
Securities available-for-sale	136,933	176,116
Securities held-to-maturity, Carrying Amount	59,960	67,335
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2,017	-3,263
Securities held-to-maturity, fair value	57,943	64,072
Residential Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	822,746	946,656
Securities Available-for-Sale, Gross Unrealized Gains	25,058	23,627
Securities Available-for-Sale, Gross Unrealized Losses	-1,726	-7,176
Securities available-for-sale	846,078	963,107
Securities held-to-maturity, Carrying Amount	885,235	688,410
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	9,410	637
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2,483	-15,274
Securities held-to-maturity, fair value	892,162	673,773
Commercial Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities held-to-maturity, Carrying Amount	183,021	164,607
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	592	6
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2,176	-6,640
Securities held-to-maturity, fair value	181,437	157,973
State And Municipal Securities [Member]
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	340,810	271,135
Securities Available-for-Sale, Gross Unrealized Gains	7,222	6,627
Securities Available-for-Sale, Gross Unrealized Losses	-722	-3,112
Securities available-for-sale	347,310	274,650
Securities held-to-maturity, Carrying Amount	1,069	1,084
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4	6
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Securities held-to-maturity, fair value	1,073	1,090
Foreign Government Debt Securities [Member]
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	500	500
Securities Available-for-Sale, Gross Unrealized Gains	0	0
Securities Available-for-Sale, Gross Unrealized Losses	0	0
Securities available-for-sale	$500	$500

SECURITIES_Securities_Narrativ

SECURITIES Securities (Narrative) (Detail) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disclosure Securities Narrative [Abstract]
Carrying value of securities pledged	$353,100,000	$401,400,000
Securities pledged under agreements subject to be sold or re-pledged by secured parties	86,500,000	108,100,000
Investment securities from one issuer that exceeds maximum percentage	0	0
Percentage of securities portfolio from one issuer, maximum	10.00%	10.00%
Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value, Total	616,800,000	38,900,000
Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	10,900,000	2,600,000
Other than Temporary Impairment Losses, Investments	$0	$0

Securities_Securities_In_Unrea

Securities (Securities In Unrealized Loss Position) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$176,890	$572,611
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	-442	-15,025
Available-for-Sale Securities, Continuous Unrelaized Loss Position, 12 Months or Longer, Fair Value	290,612	10,325
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	-4,293	-300
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Fair Value	467,502	582,936
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	-4,735	-15,325
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	55,888	743,503
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-66	-22,845
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	326,216	28,567
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Unrealized Losses	-6,610	-2,332
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Total Fair Value	382,104	772,070
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-6,676	-25,177
U.S. Treasury Securities [Member]
Investment [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	119,233	142,575
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	-159	-3,141
Available-for-Sale Securities, Continuous Unrelaized Loss Position, 12 Months or Longer, Fair Value	123,117	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	-1,393	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Fair Value	242,350	142,575
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	-1,552	-3,141
U.S. Agencies Securities [Member]
Investment [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	45,528
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	0	-1,881
Available-for-Sale Securities, Continuous Unrelaized Loss Position, 12 Months or Longer, Fair Value	46,258	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	-701	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Fair Value	46,258	45,528
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	-701	-1,881
Collateralized Mortgage Obligations [Member]
Investment [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	4,565	3,409
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	-34	-15
Available-for-Sale Securities, Continuous Unrelaized Loss Position, 12 Months or Longer, Fair Value	0	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	0	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Fair Value	4,565	3,409
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	-34	-15
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	64,072
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	-3,263
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	57,943	0
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Unrealized Losses	-2,017	0
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Total Fair Value	57,943	64,072
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2,017	-3,263
Residential Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	276,657
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	0	-7,176
Available-for-Sale Securities, Continuous Unrelaized Loss Position, 12 Months or Longer, Fair Value	89,085	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	-1,726	0
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Fair Value	89,085	276,657
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	-1,726	-7,176
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	45,867	556,410
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-38	-14,908
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	162,564	3,327
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Unrealized Losses	-2,445	-366
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Total Fair Value	208,431	559,737
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	-2,483	-15,274
State And Municipal Securities [Member]
Investment [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	53,092	104,442
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Unrealized Losses	-249	-2,812
Available-for-Sale Securities, Continuous Unrelaized Loss Position, 12 Months or Longer, Fair Value	32,152	10,325
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	-473	-300
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Fair Value	85,244	114,767
Available-for-Sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses	-722	-3,112
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Commercial Mortgage-Backed Securities [Member]
Investment [Line Items]
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	10,021	123,021
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	-28	-4,674
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	105,709	25,240
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months Or Longer, Unrealized Losses	-2,148	-1,966
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Total Fair Value	115,730	148,261
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	($2,176)	($6,640)

Securities_Remaining_Contractu

Securities (Remaining Contractual Maturity Of Securities) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment [Line Items]
Securities Available-for-Sale, Amortized Cost	$1,613,345	$1,581,191
Securities available-for-sale	1,645,344	1,602,476
Securities held-to-maturity, Carrying Amount	1,129,285	921,436
Securities held-to-maturity, fair value	1,132,615	896,908
US Treasury and Government, US States and Political Subdivisions Debt, and Foreign Government Debt Securities [Member]
Investment [Line Items]
Available-For Sale Securities, One year or less, Amortized Cost	5,586
Available-For Sale Securities, One year to five years, Amortized Cost	460,131
Available-For Sale Securities, Five years to ten years, Amortized Cost	181,139
Available-For Sale Securities, After ten years, Amortized Cost	11,110
Available-For Sale Securities, One year or less, Fair Value	5,682
Available-For Sale Securities, One year to five years, Fair Value	461,243
Available-For Sale Securities, Five years to ten years, Fair Value	184,042
Available-For Sale Securities, After ten years, Fair value	11,366
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	816
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	253
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0
Held-To-Maturity Securities, One year or less, Fair Value	817
Held-To-Maturity Securities, One year to five years, Fair Value	256
Held-To-Maturity Securities, five years to ten years, Fair Value	0
Held-To-Maturity Securities, after ten years, Fair Value	0
Collateralized Mortgage Obligations [Member]
Investment [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	132,633
Securities Available-for-Sale, Amortized Cost	132,633	169,775
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	136,933
Securities available-for-sale	136,933	176,116
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	59,960
Securities held-to-maturity, Carrying Amount	59,960	67,335
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	57,943
Securities held-to-maturity, fair value	57,943	64,072
Residential Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	822,746
Securities Available-for-Sale, Amortized Cost	822,746	946,656
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	846,078
Securities available-for-sale	846,078	963,107
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	885,235
Securities held-to-maturity, Carrying Amount	885,235	688,410
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	892,162
Securities held-to-maturity, fair value	892,162	673,773
Commercial Mortgage-Backed Securities [Member]
Investment [Line Items]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	183,021
Securities held-to-maturity, Carrying Amount	183,021	164,607
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	181,437
Securities held-to-maturity, fair value	$181,437	$157,973

Securities_Securities_Gains_Lo

Securities (Securities Gains (Losses) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain (Loss) on Investments [Line Items]
Proceeds from sales	$74,690,000	$114,740,000	$20,905,000
Gross realized gains	615,000	1,178,000	573,000
Gross realized losses	-85,000	-4,000	-778,000
Net realized gains (losses)	530,000	1,174,000	-205,000	[1]
Income tax provision (benefit) on net realized gains (losses)	209,000	463,000	-81,000
Community Reinvestment Investments [Member]
Gain (Loss) on Investments [Line Items]
Nonmarketable Equity Investments Net Realized Losses			($520,000)
[1]	Includes net losses of $520,000 in 2012 associated with certain investment funds that make qualifying investments for purposes of supporting our community reinvestment initiatives in accordance with the Community Reinvestment Act ("CRA" investments). These investments are classified in other assets in the Consolidated Statements of Financial Condition. Effective in fourth quarter 2012, net losses from these investments are recorded in other non-interest expense in the Consolidated Statements of Income.

Loans_Loan_Portfolio_Detail

Loans (Loan Portfolio) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Commercial and industrial	$5,996,070	$5,360,773
Commercial - owner-occupied commercial real estate	1,892,564	1,695,479
Total Commercial	7,888,634	7,056,252
Commercial real estate	2,323,616	2,062,889
Commercial real estate - multi-family	593,103	513,194
Total Commercial real estate	2,916,719	2,576,083
Construction	381,102	293,387
Residential real estate	361,565	341,868
Home Equity	142,177	149,732
Personal	202,022	226,699
Total loans	11,892,219	10,644,021	10,139,982
Net deferred loan fees and unamortized discount and premium on loans, included as a reduction in total loans	47,017	37,063
Overdrawn demand deposits included in total loans	$1,963	$2,772

LOANS_Loans_Loans_HeldForSale_

LOANS Loans (Loans Held-For-Sale) (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Mortgage loans held-for-sale	$42,215	[1]	$17,619	[1]
Other loans held-for-sale	72,946	[2]	9,197	[2]
Total loans held-for-sale	115,161		26,816
Participating Mortgages [Member]
Other loans held-for-sale	36,600
Branch Closing, Sale [Member]
Other loans held-for-sale	$36,300
[1]	Comprised of residential mortgage loan originations intended to be sold in the secondary market. The Company accounts for these loans under the fair value option. Refer to Note 20 for additional information regarding mortgage loans held-for-sale.
[2]	Amounts at DecemberB 31, 2014 consists of $36.6 million of commercial, commercial real estate and construction loans carried at the lower of aggregate cost or fair value and $36.3 million of commercial, commercial real estate, construction, home equity and personal loans held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia, which closed in January 2015. Amounts at DecemberB 31, 2013 represent commercial loans carried at the lower of aggregate cost or fair value. Generally, the Company intends to sell these loans within 30-60 days from the date the intent to sell was established.

Loans_Carrying_Value_Of_Loans_

Loans (Carrying Value Of Loans Pledged) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
loans pledged to secure outstanding borrowings or availability:
Loans pledged to secure FRB discount window borrowings	$478,692	[1]	$710,269	[1]
Loans pledged to secure FHLB advances	1,576,168	[2]	1,337,552	[2]
Total loans pledged	$2,054,860		$2,047,821
[1]	No borrowings were outstanding at DecemberB 31, 2014 or 2013.
[2]	Refer to Notes 10 and 11 for additional information regarding FHLB advances.

Loans_Narrative_Detail

Loans (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Loans [Line Items]
Minimum percentage owners of stock	10.00%	10.00%
Related party loans total	$9,700,000	$14,200,000
Credit commitments to troubled debt restructurings, total accruing and nonaccruing	8,500,000	5,500,000
Specific reserves on nonaccrual troubled debt restructurings	10,600,000	8,600,000
Specific reserves on accruing troubled debt restructurings	$0	$37,000
Pass [Member] | Minimum [Member]
Loans [Line Items]
Loans receivable risk rating	1
Loan Rated Five [Member] | Maximum [Member]
Loans [Line Items]
Loans receivable risk rating	5
Special Mention [Member]
Loans [Line Items]
Loans receivable risk rating	6
Potential Problem And Nonperforming [Member]
Loans [Line Items]
Loans receivable risk rating	7
Nonperforming Financing Receivable [Member] | Maximum [Member]
Loans [Line Items]
Loans receivable risk rating	8

Loans_Loan_Portfolio_Aging_Det

Loans (Loan Portfolio Aging) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Loans [Line Items]
Loan Portfolio Aging, Current	$11,812,859	$10,540,913
Loan Portfolio Aging, 30 - 59 Days Past Due	7,696	7,854
Loan Portfolio Aging, 60 - 89 Days Past Due	4,120	1,016
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	11,824,675	10,549,783
Loan Portfolio Aging, Nonaccrual	67,544	94,238
Total Commercial	7,888,634	7,056,252
Total Commercial real estate	2,916,719	2,576,083
Total Construction	381,102	293,387
Total Residential real estate	361,565	341,868
Total Home Equity	142,177	149,732
Total Personal	202,022	226,699
Total loans	11,892,219	10,644,021	10,139,982
Commercial [Member]
Loans [Line Items]
Loan Portfolio Aging, Current	7,855,833	7,031,318
Loan Portfolio Aging, 30 - 59 Days Past Due	762	2
Loan Portfolio Aging, 60 - 89 Days Past Due	992	153
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	7,857,587	7,031,473
Loan Portfolio Aging, Nonaccrual	31,047	24,779
Total loans	7,888,634	7,056,252	6,496,568
Commercial Real Estate [Member]
Loans [Line Items]
Loan Portfolio Aging, Current	2,891,301	2,523,023
Loan Portfolio Aging, 30 - 59 Days Past Due	5,408	5,946
Loan Portfolio Aging, 60 - 89 Days Past Due	261	161
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	2,896,970	2,529,130
Loan Portfolio Aging, Nonaccrual	19,749	46,953
Total loans	2,916,719	2,576,083	2,675,901
Construction [Member]
Loans [Line Items]
Loan Portfolio Aging, Current	380,939	293,387
Loan Portfolio Aging, 30 - 59 Days Past Due	163	0
Loan Portfolio Aging, 60 - 89 Days Past Due	0	0
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	381,102	293,387
Loan Portfolio Aging, Nonaccrual	0	0
Total loans	381,102	293,387	190,496
Residential Real Estate [Member]
Loans [Line Items]
Loan Portfolio Aging, Current	354,717	330,922
Loan Portfolio Aging, 30 - 59 Days Past Due	943	674
Loan Portfolio Aging, 60 - 89 Days Past Due	631	296
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	356,291	331,892
Loan Portfolio Aging, Nonaccrual	5,274	9,976
Total loans	361,565	341,868	373,580
Home Equity [Member]
Loans [Line Items]
Loan Portfolio Aging, Current	128,500	136,341
Loan Portfolio Aging, 30 - 59 Days Past Due	397	1,108
Loan Portfolio Aging, 60 - 89 Days Past Due	2,236	404
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	131,133	137,853
Loan Portfolio Aging, Nonaccrual	11,044	11,879
Total loans	142,177	149,732	167,760
Personal [Member]
Loans [Line Items]
Loan Portfolio Aging, Current	201,569	225,922
Loan Portfolio Aging, 30 - 59 Days Past Due	23	124
Loan Portfolio Aging, 60 - 89 Days Past Due	0	2
Loan Portfolio Aging, 90 Days Past Due and Accruing	0	0
Loan Portfolio Aging, Total Accruing Loans	201,592	226,048
Loan Portfolio Aging, Nonaccrual	430	651
Total loans	$202,022	$226,699	$235,677

Loans_Impaired_Loans_Detail

Loans (Impaired Loans) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$106,095		$131,950
Recorded Investment With No Specific Reserve	39,470		45,536
Recorded Investment With Specific Reserve	50,819		68,878
Total Recorded Investment	90,289	[1]	114,414	[1]	199,760	[1]
Specific Reserve	16,627	[1]	22,377	[1]	43,390	[1]
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	60,174		44,471
Recorded Investment With No Specific Reserve	25,739		30,039
Recorded Investment With Specific Reserve	26,432		11,774
Total Recorded Investment	52,171	[1]	41,813	[1]	86,180	[1]
Specific Reserve	11,487	[1]	4,895	[1]	13,259	[1]
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	26,738		61,112
Recorded Investment With No Specific Reserve	9,755		10,301
Recorded Investment With Specific Reserve	10,193		38,203
Total Recorded Investment	19,948	[1]	48,504	[1]	83,312	[1]
Specific Reserve	2,441	[1]	12,536	[1]	20,450	[1]
Construction [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment	0	[1]	0	[1]	557	[1]
Specific Reserve	0	[1]	0	[1]	117	[1]
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	5,849		11,823
Recorded Investment With No Specific Reserve	349		2,629
Recorded Investment With Specific Reserve	4,925		7,347
Total Recorded Investment	5,274	[1]	9,976	[1]	11,689	[1]
Specific Reserve	735	[1]	2,412	[1]	3,996	[1]
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	12,904		13,893
Recorded Investment With No Specific Reserve	3,627		2,567
Recorded Investment With Specific Reserve	8,839		10,903
Total Recorded Investment	12,466	[1]	13,470	[1]	13,200	[1]
Specific Reserve	1,855	[1]	2,386	[1]	2,797	[1]
Personal [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	430		651
Recorded Investment With No Specific Reserve	0		0
Recorded Investment With Specific Reserve	430		651
Total Recorded Investment	430	[1]	651	[1]	4,822	[1]
Specific Reserve	$109	[1]	$148	[1]	$2,771	[1]
[1]	Refer to Notes 1 and 4 for additional information regarding impaired loans.

Loans_Average_Recorded_Investm

Loans (Average Recorded Investment And Interest Income Recognized On Impaired Loans) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$105,741	[1]	$165,740	[1]
Interest Income Recognized	1,596	[1]	2,816	[1]
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	51,030	[1]	72,050	[1]
Interest Income Recognized	1,441	[1]	2,265	[1]
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	32,256	[1]	64,887	[1]
Interest Income Recognized	67	[1]	428	[1]
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	9,281	[1]	11,354	[1]
Interest Income Recognized	0	[1]	3	[1]
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	12,592	[1]	14,665	[1]
Interest Income Recognized	88	[1]	120	[1]
Personal [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	582	[1]	2,784	[1]
Interest Income Recognized	$0	[1]	$0	[1]
[1]	Represents amounts while classified as impaired for the periods presented.

Loans_Credit_Quality_Indicator

Loans (Credit Quality Indicators) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	$100,989	$71,257
Percentage of Special Mention Loans to Portfolio Loan Type Total	0.80%	0.70%
Potential Problem Loans	87,442	101,772
Percentage of Potential Problem Loans to Portfolio Loan Type Total	0.70%	1.00%
Non-Performing Loans	67,544	94,238
Percentage of Non-performing Loans to Portfolio Loan Type Total	0.60%	0.90%
Total Commercial	7,888,634	7,056,252
Total Commercial real estate	2,916,719	2,576,083
Total Construction	381,102	293,387
Total Residential real estate	361,565	341,868
Total Home Equity	142,177	149,732
Total Personal	202,022	226,699
Total loans	11,892,219	10,644,021	10,139,982
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	93,130	62,272
Percentage of Special Mention Loans to Portfolio Loan Type Total	1.20%	0.90%
Potential Problem Loans	78,562	87,391
Percentage of Potential Problem Loans to Portfolio Loan Type Total	1.00%	1.20%
Non-Performing Loans	31,047	24,779
Percentage of Non-performing Loans to Portfolio Loan Type Total	0.40%	0.40%
Total loans	7,888,634	7,056,252	6,496,568
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	3,552	1,016
Percentage of Special Mention Loans to Portfolio Loan Type Total	0.10%
Potential Problem Loans	746	4,489
Percentage of Potential Problem Loans to Portfolio Loan Type Total		0.20%
Non-Performing Loans	19,749	46,953
Percentage of Non-performing Loans to Portfolio Loan Type Total	0.70%	1.80%
Total loans	2,916,719	2,576,083	2,675,901
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	0	0
Percentage of Special Mention Loans to Portfolio Loan Type Total	0.00%	0.00%
Potential Problem Loans	0	0
Percentage of Potential Problem Loans to Portfolio Loan Type Total	0.00%	0.00%
Non-Performing Loans	0	0
Percentage of Non-performing Loans to Portfolio Loan Type Total	0.00%	0.00%
Total loans	381,102	293,387	190,496
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	2,964	4,898
Percentage of Special Mention Loans to Portfolio Loan Type Total	0.80%	1.40%
Potential Problem Loans	5,981	7,177
Percentage of Potential Problem Loans to Portfolio Loan Type Total	1.70%	2.10%
Non-Performing Loans	5,274	9,976
Percentage of Non-performing Loans to Portfolio Loan Type Total	1.50%	2.90%
Total loans	361,565	341,868	373,580
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	1,170	2,884
Percentage of Special Mention Loans to Portfolio Loan Type Total	0.80%	1.90%
Potential Problem Loans	2,108	2,538
Percentage of Potential Problem Loans to Portfolio Loan Type Total	1.50%	1.70%
Non-Performing Loans	11,044	11,879
Percentage of Non-performing Loans to Portfolio Loan Type Total	7.80%	7.90%
Total loans	142,177	149,732	167,760
Personal [Member]
Financing Receivable, Recorded Investment [Line Items]
Special Mention Loans	173	187
Percentage of Special Mention Loans to Portfolio Loan Type Total	0.10%	0.10%
Potential Problem Loans	45	177
Percentage of Potential Problem Loans to Portfolio Loan Type Total		0.10%
Non-Performing Loans	430	651
Percentage of Non-performing Loans to Portfolio Loan Type Total	0.20%	0.30%
Total loans	$202,022	$226,699	$235,677

Loans_Troubled_Debt_Restructur

Loans (Troubled Debt Restructured Loans Outstanding) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Accruing Interest [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	$22,745		$20,176
Accruing Interest [Member] | Commercial [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	21,124		17,635
Accruing Interest [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	199		950
Accruing Interest [Member] | Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	0		0
Accruing Interest [Member] | Home Equity [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	1,422		1,591
Accruing Interest [Member] | Personal [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	0		0
Nonaccrual [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	36,298	[1]	32,182	[1]
Nonaccrual [Member] | Commercial [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	20,113	[1]	6,188	[1]
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	8,005	[1]	19,309	[1]
Nonaccrual [Member] | Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	1,881	[1]	2,239	[1]
Nonaccrual [Member] | Home Equity [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	5,886	[1]	3,805	[1]
Nonaccrual [Member] | Personal [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Troubled debt restructured loans outstanding	$413	[1]	$641	[1]
[1]	Included in nonperforming loans.

Loans_Additions_to_Troubled_De

Loans (Additions to Troubled Debt Restructuring During the Period) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
	borrower		borrower
Accruing Interest [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	11		9
Recorded Investment, Pre-Modification	$42,642	[1]	$8,399	[1]
Recorded Investment, Post-Modification	42,642	[1]	8,399	[1]
Accruing Interest [Member] | Commercial [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	9		6
Recorded Investment, Pre-Modification	42,014	[1]	7,288	[1]
Recorded Investment, Post-Modification	42,014	[1]	7,288	[1]
Accruing Interest [Member] | Commercial [Member] | Extension Of Maturity Date [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	4		6
Recorded Investment, Pre-Modification	20,725	[1],[2]	7,288	[1],[2]
Recorded Investment, Post-Modification	20,725	[1],[2]	7,288	[1],[2]
Accruing Interest [Member] | Commercial [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	5		0
Recorded Investment, Pre-Modification	21,289	[1],[3]	0	[1],[3]
Recorded Investment, Post-Modification	21,289	[1],[3]	0	[1],[3]
Accruing Interest [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	2		2
Recorded Investment, Pre-Modification	628	[1]	961	[1]
Recorded Investment, Post-Modification	628	[1]	961	[1]
Accruing Interest [Member] | Commercial Real Estate [Member] | Extension Of Maturity Date [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	1		1
Recorded Investment, Pre-Modification	202	[1],[2]	244	[1],[2]
Recorded Investment, Post-Modification	202	[1],[2]	244	[1],[2]
Accruing Interest [Member] | Commercial Real Estate [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	1		1
Recorded Investment, Pre-Modification	426	[1],[3]	717	[1],[3]
Recorded Investment, Post-Modification	426	[1],[3]	717	[1],[3]
Accruing Interest [Member] | Residential Real Estate [Member] | Extension Of Maturity Date [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	0		1
Recorded Investment, Pre-Modification	0	[1],[2]	150	[1],[2]
Recorded Investment, Post-Modification	0	[1],[2]	150	[1],[2]
Nonaccrual [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	27		35
Recorded Investment, Pre-Modification	23,812	[1]	24,392	[1]
Recorded Investment, Post-Modification	23,833	[1]	13,298	[1]
Change in recorded investment due to net (advances) principal paydowns at time of modification	-21	[1]	7,916	[1]
Change in recorded investment due to charge-offs at time of modification	0	[1]	3,398	[1]
Nonaccrual [Member] | Commercial [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	10		8
Recorded Investment, Pre-Modification	17,900	[1]	2,129	[1]
Recorded Investment, Post-Modification	17,822	[1]	2,129	[1]
Nonaccrual [Member] | Commercial [Member] | Extension Of Maturity Date [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	0		2
Recorded Investment, Pre-Modification	0	[1],[2]	334	[1],[2]
Recorded Investment, Post-Modification	0	[1],[2]	334	[1],[2]
Nonaccrual [Member] | Commercial [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	10		6
Recorded Investment, Pre-Modification	17,900	[1],[3]	1,795	[1],[3]
Recorded Investment, Post-Modification	17,822	[1],[3]	1,795	[1],[3]
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	3		11
Recorded Investment, Pre-Modification	2,057	[1]	18,859	[1]
Recorded Investment, Post-Modification	2,070	[1]	7,772	[1]
Nonaccrual [Member] | Commercial Real Estate [Member] | Extension Of Maturity Date [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	0		1
Recorded Investment, Pre-Modification	0	[1],[2]	297	[1],[2]
Recorded Investment, Post-Modification	0	[1],[2]	297	[1],[2]
Nonaccrual [Member] | Commercial Real Estate [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	3		10
Recorded Investment, Pre-Modification	2,057	[1],[3]	18,562	[1],[3]
Recorded Investment, Post-Modification	2,070	[1],[3]	7,475	[1],[3]
Nonaccrual [Member] | Residential Real Estate [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	5		1
Recorded Investment, Pre-Modification	961	[1],[3]	342	[1],[3]
Recorded Investment, Post-Modification	1,034	[1],[3]	342	[1],[3]
Nonaccrual [Member] | Home Equity [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	9		13
Recorded Investment, Pre-Modification	2,894	[1]	2,584	[1]
Recorded Investment, Post-Modification	2,907	[1]	2,577	[1]
Nonaccrual [Member] | Home Equity [Member] | Extension Of Maturity Date [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	1		5
Recorded Investment, Pre-Modification	114	[1],[2]	824	[1],[2]
Recorded Investment, Post-Modification	114	[1],[2]	824	[1],[2]
Nonaccrual [Member] | Home Equity [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	8		8
Recorded Investment, Pre-Modification	2,780	[1],[3]	1,760	[1],[3]
Recorded Investment, Post-Modification	2,793	[1],[3]	1,753	[1],[3]
Nonaccrual [Member] | Personal [Member] | Other Concession [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number of Borrowers	0		2
Recorded Investment, Pre-Modification	0	[1],[3]	478	[1],[3]
Recorded Investment, Post-Modification	$0	[1],[3]	$478	[1],[3]
[1]	Represents amounts as of the date immediately prior to and immediately after the modification is effective.
[2]	Extension of maturity date also includes loans renewed at existing rate of interest which is considered a below market rate for that particular loanbs risk profile.
[3]	Other concessions primarily include interest rate reductions, loan increases or deferrals of principal.

Loans_Accruing_Troubled_Debt_R

Loans (Accruing Troubled Debt Restructurings Reclassified as Nonperforming Within 12 Months Of Restructuring) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
	borrower		borrower
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number Of Borrowers	3		3
Recorded Investment	$756	[1]	$5,407	[1]
Commercial [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number Of Borrowers	0		1
Recorded Investment	0	[1]	149	[1]
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number Of Borrowers	1		2
Recorded Investment	699	[1]	5,258	[1]
Residential Real Estate [Member]
Financing Receivable, Troubled Debt Restructurings [Line Items]
Number Of Borrowers	2		0
Recorded Investment	$57	[1]	$0	[1]
[1]	Represents amounts as of the balance sheet date from the quarter the default was first reported.

Recovered_Sheet2

Allowance For Loan Losses And Reserve For Unfunded Commitments (Allowance For Loan Losses and Recorded Investment in Loans) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	$143,109		$161,417		$191,594
Loans charged-off	-14,497		-58,234		-118,028
Recoveries on loans previously charged-off	10,717		8,762		16,975
Net recoveries (charge-offs)	-3,780		-49,472		-101,053
Provision (release) for loan losses	13,169		31,164		70,876
Allowance for Loan Losses, Balance at end of period	152,498		143,109		161,417
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	16,627	[1]	22,377	[1]	43,390	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	135,871		120,732		118,027
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	90,289	[1]	114,414	[1]	199,760	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	11,801,930		10,529,607		9,940,222
Total loans	11,892,219		10,644,021		10,139,982
Commercial [Member]
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	80,768		63,709		60,663
Loans charged-off	-5,588		-22,339		-31,768
Recoveries on loans previously charged-off	6,340		5,054		4,179
Net recoveries (charge-offs)	752		-17,285		-27,589
Provision (release) for loan losses	21,942		34,344		30,635
Allowance for Loan Losses, Balance at end of period	103,462		80,768		63,709
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	11,487	[1]	4,895	[1]	13,259	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	91,975		75,873		50,450
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	52,171	[1]	41,813	[1]	86,180	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	7,836,463		7,014,439		6,410,388
Total loans	7,888,634		7,056,252		6,496,568
Commercial Real Estate [Member]
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	42,362		73,150		94,905
Loans charged-off	-6,214		-25,294		-68,099
Recoveries on loans previously charged-off	2,674		2,173		8,709
Net recoveries (charge-offs)	-3,540		-23,121		-59,390
Provision (release) for loan losses	-6,984		-7,667		37,635
Allowance for Loan Losses, Balance at end of period	31,838		42,362		73,150
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	2,441	[1]	12,536	[1]	20,450	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	29,397		29,826		52,700
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	19,948	[1]	48,504	[1]	83,312	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	2,896,771		2,527,579		2,592,589
Total loans	2,916,719		2,576,083		2,675,901
Construction [Member]
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	3,338		2,434		12,852
Loans charged-off	-6		70		-1,979
Recoveries on loans previously charged-off	79		48		2,315
Net recoveries (charge-offs)	73		118		336
Provision (release) for loan losses	879		786		-10,754
Allowance for Loan Losses, Balance at end of period	4,290		3,338		2,434
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	0	[1]	0	[1]	117	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	4,290		3,338		2,317
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	0	[1]	0	[1]	557	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	381,102		293,387		189,939
Total loans	381,102		293,387		190,496
Residential Real Estate [Member]
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	7,555		9,696		6,376
Loans charged-off	-1,514		-3,501		-3,010
Recoveries on loans previously charged-off	675		15		126
Net recoveries (charge-offs)	-839		-3,486		-2,884
Provision (release) for loan losses	-1,400		1,345		6,204
Allowance for Loan Losses, Balance at end of period	5,316		7,555		9,696
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	735	[1]	2,412	[1]	3,996	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	4,581		5,143		5,700
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	5,274	[1]	9,976	[1]	11,689	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	356,291		331,892		361,891
Total loans	361,565		341,868		373,580
Home Equity [Member]
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	5,648		6,797		4,022
Loans charged-off	-1,017		-3,445		-3,128
Recoveries on loans previously charged-off	228		475		509
Net recoveries (charge-offs)	-789		-2,970		-2,619
Provision (release) for loan losses	65		1,821		5,394
Allowance for Loan Losses, Balance at end of period	4,924		5,648		6,797
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	1,855	[1]	2,386	[1]	2,797	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	3,069		3,262		4,000
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	12,466	[1]	13,470	[1]	13,200	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	129,711		136,262		154,560
Total loans	142,177		149,732		167,760
Personal [Member]
Allowance for Loan Losses
Allowance for Loan Losses, Balance at beginning of period	3,438		5,631		12,776
Loans charged-off	-158		-3,725		-10,044
Recoveries on loans previously charged-off	721		997		1,137
Net recoveries (charge-offs)	563		-2,728		-8,907
Provision (release) for loan losses	-1,333		535		1,762
Allowance for Loan Losses, Balance at end of period	2,668		3,438		5,631
Allowance for Loan Losses, Ending balance, loans individually evaluated for impairment	109	[1]	148	[1]	2,771	[1]
Allowance for Loan Losses, Ending balance, loans collectively evaluated for impairment	2,559		3,290		2,860
Recorded Investment in Loans, Ending balance, loans individually evaluated for impairment	430	[1]	651	[1]	4,822	[1]
Recorded Investment in Loans, Ending balance, loans collectively evaluated for impairment	201,592		226,048		230,855
Total loans	$202,022		$226,699		$235,677
[1]	Refer to Notes 1 and 4 for additional information regarding impaired loans.

Recovered_Sheet3

Allowance For Loan Losses And Reserve For Unfunded Commitments (Reserve For Unfunded Commitments) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reserve for Unfunded Commitments [Roll Forward]
Balance at beginning of period	$9,206	[1]	$7,343	[1]	$7,277	[1]
Provision For Unfunded Commitments	3,152	[1]	1,863	[1]	66	[1]
Charge-off of Unfunded Commitments	-84	[1]	0	[1]	0	[1]
Balance at end of period	12,274	[1]	9,206	[1]	7,343	[1]
Unfunded commitments, excluding covered assets, at period end	$6,265,506	[1]	$5,028,268	[1]	$4,707,373	[1]
[1]	Unfunded commitments include commitments to extend credit, standby letters of credit and commercial letters of credit. Unfunded commitments related to covered assets are excluded as they are covered under a loss sharing agreement with the FDIC.

Covered_Assets_Covered_Assets_

Covered Assets (Covered Assets) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Covered Assets [Line Items]
Non-cash transfers of covered assets to loans	$28,692,000		$0		$0
Non-cash transfers of covered asset OREO to other real estate	719,000		0		0
Commercial loans	0		11,562,000
Loans and Leases Receivable, Gross, Carrying Amount, Covered	34,132,000		112,746,000
Commercial real estate loans	0		46,657,000
Residential mortgage loans	32,182,000		36,883,000
Consumer installment and other	0		3,472,000
Foreclosed real estate	187,000		7,880,000
Estimated loss reimbursement by the FDIC	1,763,000		6,292,000
Total covered assets	34,132,000		112,746,000
Allowance for covered loan losses	-5,191,000		-16,511,000
Net covered assets	28,941,000		96,235,000
Purchased Impaired Loans Carrying Amount	420,000		7,600,000
Purchased Impaired Loans [Member]
Covered Assets [Line Items]
Total covered assets	32,182,000	[1]	98,315,000	[1]
Allowance for covered loan losses	-5,191,000	[1]	-16,511,000	[1]
Net covered assets	26,991,000	[1]	81,804,000	[1]
Other Assets [Member]
Covered Assets [Line Items]
Total covered assets	1,950,000		14,431,000
Net covered assets	1,950,000		14,431,000
Nonperforming covered loans [Member]
Covered Assets [Line Items]
Nonperforming covered loans	6,828,000	[1],[2]	15,610,000	[1],[2]
Commercial [Member] | Purchased Impaired Loans [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	0	[1]	11,562,000	[1]
Commercial Real Estate [Member] | Purchased Impaired Loans [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	0	[1]	46,657,000	[1]
Residential Mortgage [Member] | Purchased Impaired Loans [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	32,182,000	[1]	36,883,000	[1]
Consumer Loan [Member] | Purchased Impaired Loans [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	0	[1]	3,213,000	[1]
Consumer Loan [Member] | Other Assets [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	0		259,000
Foreclosed real estate [Member] | Other Assets [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	187,000		7,880,000
Estimated Loss Reimbursement By the FDIC [Member] | Other Assets [Member]
Covered Assets [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$1,763,000		$6,292,000
[1]	Purchased loans include $420,000 and $7.6 million of purchased impaired loans as of DecemberB 31, 2014 and 2013, respectively.
[2]	Excludes purchased impaired loans which are accounted for on a pool basis based on common risk characteristics as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Because we are recognizing interest income on each pool of loans, all purchased impaired loans are considered to be performing.

Recovered_Sheet4

Goodwill And Other Intangible Assets (Changes In The Carrying Amount Of Goodwill By Operating Segment) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Balance, beginning	$94,041,000	$94,521,000
Goodwill, Written off Related to Sale of Business Unit		-226,000
Tax benefit adjustment	0	-254,000
Balance, ending	94,041,000	94,041,000
Banking [Member]
Goodwill [Roll Forward]
Balance, beginning	81,755,000	81,755,000
Tax benefit adjustment	0	0
Balance, ending	81,755,000	81,755,000
Asset Management [Member]
Goodwill [Roll Forward]
Balance, beginning	12,286,000	12,766,000
Goodwill, Written off Related to Sale of Business Unit		-226,000
Tax benefit adjustment	0	-254,000
Balance, ending	12,286,000	12,286,000
Holding Company Activities [Member]
Goodwill [Roll Forward]
Balance, beginning	0	0
Tax benefit adjustment	0	0
Balance, ending	$0	$0

Premises_Furniture_And_Equipme2

Premises, Furniture, And Equipment (Premises, Furniture, And Equipment) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Land	$1,874	$1,874
Building	9,980	7,581
Leasehold improvements	37,796	39,644
Furniture and equipment	45,346	42,044
Software	16,363	14,421
Total cost	111,359	105,564
Accumulated depreciation	-72,216	-65,860
Net book value	39,143	39,704
Depreciation of premises, furniture, and equipment	$8,693	$8,461	$9,293

Recovered_Sheet5

Goodwill And Other Intangible Assets (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2014
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Written off Related to Sale of Business Unit		($226,000)
Goodwill, Impairment charge	0		0
Goodwill, Tax benefit adjustment	0	-254,000
Fair Value Inputs, Control Premium	15.00%
Goodwill, Impairment Loss, Excluding Loss Related to Sale of Business Unit		0
Impairment charges for other intangible assets	0	0	0
Minimum [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized estimated useful lives	8 years
Maximum [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized estimated useful lives	12 years
Asset Management [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Written off Related to Sale of Business Unit		-226,000
Goodwill, Impairment charge		146,000
Goodwill, Tax benefit adjustment	0	-254,000
Reporting unit, percentage of fair value in excess of carrying amount				250.00%
Banking [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill, Tax benefit adjustment	0	0
Reporting unit, percentage of fair value in excess of carrying amount				97.00%
Client relationships [Member] | Asset Management [Member]
Goodwill And Other Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Period Increase (Decrease)		$815,000

Premises_Furniture_And_Equipme3

Premises, Furniture, And Equipment (Future Minimum Rental Payments Under Operating Leases) (Detail) (USD $)	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
2015	$12,794,000	[1]
2016	11,376,000	[1]
2017	10,926,000	[1]
2018	10,632,000	[1]
2019	9,974,000	[1]
2020 and thereafter	32,942,000	[1]
Total minimum lease payments	88,644,000	[1]
Future Minimum Sublease Rentals	$2,000,000
[1]	Minimum payments have not been reduced by minimum sublease rentals of $2.0 million due in the future under non-cancellable subleases.

Goodwill_And_Other_Intangible_2

Goodwill And Other Intangible Assets (Other Intangible Assets) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Other Intangible Assets [Line Items]
Net carrying amount	$5,885	$8,892
Amortization during the period	3,007	3,121	2,684
Core deposit Intangible [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross carrying amount	18,093	18,093	18,093
Accumulated Amortization	12,870	10,071	7,362
Net carrying amount	5,223	8,022	10,731
Amortization during the period	2,799	2,709	2,282
Weighted-average remaining life (in years)	2 years	3 years	4 years
Client relationships [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross carrying amount	2,002	2,002	5,059
Accumulated Amortization	1,340	1,132	2,962
Net carrying amount	662	870	2,097
Amortization during the period	$208	$412	$402
Weighted-average remaining life (in years)	6 years	7 years	7 years

Recovered_Sheet6

PREMISES, FURNITURE, AND EQUIPMENT Premises, Furniture, and Equipment (Rental Expense and Rental Income) (Details) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013		Dec. 31, 2012
Rental income and expense [Abstract]
Rental expense charged to operations	$12,066	[1],[2]	$12,224	[1],[2]	$12,128	[1],[2]
Rental income from premises leased to others	$704	[2]	$659	[2]	$676	[2]
[1]	Including amounts paid under short-term cancellable leases.
[2]	Does not include rental expense or sublease rental income for certain restructured leases.

Goodwill_And_Other_Intangible_3

Goodwill And Other Intangible Assets (Scheduled Amortization Of Other Intangible Assets) (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Disclosure Goodwill And Other Intangible Assets Scheduled Amortization Of Other Intangible Assets [Abstract]
Year Ended December 31, 2015	$2,455
Year Ended December 31, 2016	2,161
Year Ended December 31, 2017	1,125
Year Ended December 31, 2018	98
Year Ended December 31, 2019	28
Year Ended December 31, 2020 and thereafter	18
Total	$5,885

Deposits_Summary_Of_Deposits_D

Deposits (Summary Of Deposits) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]
Noninterest-bearing deposits	$3,516,695	[1]	$3,172,676
Interest-bearing deposits	1,907,320	[1]	1,470,856
Savings deposits	319,100	[1]	284,482
Money market accounts	4,851,925	[1]	4,515,079
Time deposits less than $100,000	296,899	[1]	346,812
Time deposits of $100,000 or more	2,198,029	[1],[2]	2,223,736
Total deposits	$13,089,968	[1]	$12,013,641	$12,173,634
[1]	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.
[2]	Excludes time deposits held-for-sale of $32.2 million as of December 31, 2014.

Deposits_Maturities_Of_Time_De

Deposits (Maturities Of Time Deposits Of $100,000 Or More) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Deposits [Abstract]
Maturing within 3 months	$466,612	[1]
After 3 but within 6 months	398,345	[1]
After 6 but within 12 months	748,917	[1]
After 12 months	584,155	[1]
Total	$2,198,029	[1],[2]	$2,223,736
[1]	Excludes time deposits held-for-sale of $32.2 million as of December 31, 2014.
[2]	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.

Recovered_Sheet7

Short-Term and Secured Borrowings (Summary Of Short-Term Borrowings) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Outstanding: [Abstract]
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Rolling Twelve Months	$428,000,000		$2,000,000
FHLB advances, rate	0.13%		3.37%
Other Information: [Abstract]
FHLB Advances, Branch Of Federal Home Loan Bank, Weighted Average Maturity	7 months		12 months
Unused FHLB advances availability	265,529,000		395,302,000
Unused overnight federal funds availability	630,500,000	[1]	520,000,000	[1]
Borrowing capacity through the FRB's discount window primary credit program	403,752,000	[2]	621,855,000	[2]
Narrative: [Abstract]
FHLB borrowing capacity	735,900,000
Revolving Line of Credit, Conversion to Term Loan, Conversion Date	25-Sep-15
Revolving Line of Credit, Conversion to Term Loan, Term Loan Due Date	26-Sep-17
Revolving Line of Credit, Conversion to Term Loan, Interest Rate Increment Over LIBOR	1.95%
Revolving Line of Credit, Conversion to Term Loan, Increment Under Base Interest Rate	0.50%
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	4,400,000		6,400,000
Revolving Credit Facility [Member]
Narrative: [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	60,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	0
Federal Home Loan Bank of Atlanta [Member]
Short-term Debt [Line Items]
Federal Home Loan Bank Advances	8,000,000
Outstanding: [Abstract]
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Rolling Twelve Months	3,000,000
Federal Home Loan Bank of Chicago [Member]
Short-term Debt [Line Items]
Federal Home Loan Bank Advances	470,000,000
Outstanding: [Abstract]
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Rolling Twelve Months	$425,000,000
[1]	Our total availability of overnight fed fund borrowings is not a committed line of credit and is dependent upon lender availability.
[2]	Our borrowing capacity changes each quarter subject to available collateral and FRB discount factors.

LongTerm_Debt_Schedule_Of_Long

Long-Term Debt (Schedule Of Long-Term Debt) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 26, 2012
Debt Instrument [Line Items]
Subordinated debt			$125,000,000
FHLB advances	50,000,000	258,000,000
Total long-term debt	344,788,000	627,793,000
2.89% junior subordinated debentures due 2034 [Member]
Debt Instrument [Line Items]
Increment Over Libor Of Long Term Debt	2.65%
1.95% junior subordinated debentures due 2035 [Member]
Debt Instrument [Line Items]
Increment Over Libor Of Long Term Debt	1.71%
1.74 junior subordinated debentures due 2035 [Member]
Debt Instrument [Line Items]
Increment Over Libor Of Long Term Debt	1.50%
Parent Company [Member]
Debt Instrument [Line Items]
Total long-term debt	294,788,000	369,793,000
Parent Company [Member] | 2.89% junior subordinated debentures due 2034 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.89%
Subordinated Borrowing, Due Date	17-Jun-34
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent	8,248,000	8,248,000
Parent Company [Member] | 1.95% junior subordinated debentures due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.95%
Subordinated Borrowing, Due Date	15-Sep-35
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent	51,547,000	51,547,000
Parent Company [Member] | 1.74 junior subordinated debentures due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.74%
Subordinated Borrowing, Due Date	15-Dec-35
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent	41,238,000	41,238,000
Parent Company [Member] | 10.00% Junior Subordinated Debentures Due 2068 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Subordinated Borrowing, Due Date	15-Jun-68
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent	68,755,000	143,760,000
Parent Company [Member] | 7.125% subordinated debentures due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.13%
Subordinated Borrowing, Due Date	30-Oct-42
Subordinated debt	125,000,000	125,000,000
Subsidiaries [Member]
Debt Instrument [Line Items]
FHLB advances	$50,000,000	$258,000,000

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Oct. 08, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Payments for Repurchase of Trust Preferred Securities	$75,000,000
Trust Preferred Liquidation Amount		$25
Parent Company [Member]
Debt Instrument [Line Items]
Number of Wholly-Owned Trusts	4
10.00% Junior Subordinated Debentures Due 2068 [Member] | Parent Company [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent	$68,755,000		$143,760,000

LONGTERM_DEBT_LongTerm_Debt_Ma

LONG-TERM DEBT Long-Term Debt (Maturity and Rate Schedule for FHLB Long-Term Advances) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	$50,000,000		$258,000,000
Weighted average interest rate of FHLB long-term advances at period end	3.75%		0.22%
Forward Commitment Advance with FHLB	150,000,000
Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	50,000,000		258,000,000
June 24, 2015 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	0		1,000,000
December 21, 2015 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	0		2,000,000
December 31, 2015 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	0		250,000,000
March 25, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	2,000,000		2,000,000
May 22, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	3,000,000		3,000,000
September 12, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	15,000,000	[1]	0
September 26, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	15,000,000	[1]	0
December 9, 2019 [Member] [Domain] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Long-term Federal Home Loan Bank Advances	$15,000,000	[2]
Federal Home Loan Bank Advances [Member] | June 24, 2015 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%		3.71%
Federal Home Loan Bank Advances [Member] | December 21, 2015 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%		4.22%
Federal Home Loan Bank Advances [Member] | December 31, 2015 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%		0.09%
Federal Home Loan Bank Advances [Member] | March 25, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.26%		4.26%
Federal Home Loan Bank Advances [Member] | May 22, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.68%		4.68%
Federal Home Loan Bank Advances [Member] | September 12, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.72%		0.00%
Federal Home Loan Bank Advances [Member] | September 26, 2019 [Member] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.69%		0.00%
Federal Home Loan Bank Advances [Member] | December 9, 2019 [Member] [Domain] | Subsidiaries [Member]
Maturity and Rate Schedule of FHLB Long-term Advances [Table] [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.58%
[1]	Provides for a one-time option to increase the advances in September 2016, up to $150.0 million each at the same fixed rate as the original advance. The advances include prepayment features and are subject to a prepayment fee.
[2]	Provides for a one-time option to increase the advances in December 2016, up to $150.0 million each at the same fixed rate as the original advance. The advances include prepayment features and are subject to a prepayment fee.

LongTerm_Debt_Scheduled_Maturi

Long-Term Debt (Scheduled Maturities Of Long-Term Debt) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Disclosure Long Term Debt Scheduled Maturities Of Long Term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Year Four	$50,000
Long Term Debt Maturities Repayments Of Principal Five Years and after	294,788
Total long-term debt	$344,788	$627,793

Recovered_Sheet8

Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities (Narrative) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014		Oct. 08, 2014	Dec. 31, 2013
Debt [Line Items]
Ownership percentage		100.00%
Principal Amount of Debentures		$169,788,000	[1]		$244,793,000	[1]
Payments for Repurchase of Trust Preferred Securities		75,000,000
7.125% subordinated debentures due 2042 [Member] | Parent Company [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.13%
10.00% Junior Subordinated Debentures Due 2068 [Member] | Parent Company [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		10.00%
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent		68,755,000			143,760,000
Private Bancorp Capital Trust IV [Member]
Debt [Line Items]
Principal Amount of Debentures		68,755,000	[1]		143,760,000	[1]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Debt Instrument, Interest Rate, Stated Percentage		10.00%	[2]
Common Stock Trust Preferred Securities And Related Debentures Maturity Date		Jun-68
Common Securities Issued		$5,000		$5,225
[1]	The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the Debentures at maturity or upon their earlier redemption in whole or in part. The Debentures are redeemable in whole or in part prior to maturity at any time after the dates shown in the table and, only after we have obtained Federal Reserve approval, if then required under applicable guidelines or regulations.
[2]	Reflects the coupon rate in effect at DecemberB 31, 2014. The coupon rate for the Bloomfield Hills Statutory Trust I is a variable rate and is based on three-month LIBOR plus 2.65%. The coupon rates for the PrivateBancorp Statutory Trusts II and III are at a variable rate based on three-month LIBOR plus 1.71% for Trust II and three-month LIBOR plus 1.50% for Trust III. The coupon rate for the PrivateBancorp Capital Trust IV is fixed. Distributions for all of the Trusts are payable quarterly. We have the right to defer payment of interest on the Debentures at any time or from time to time for a period not exceeding ten years in the case of the Debentures held by Trust IV, and five years in the case of all other Debentures, without causing an event of default under the related indenture, provided no extension period may extend beyond the stated maturity of the Debentures. During such extension period, distributions on the trust preferred securities would also be deferred, and our ability to pay dividends on our common stock would generally be prohibited. The Federal Reserve has the ability to prevent interest payments on the Debentures.

Recovered_Sheet9

Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities (Common Securities, Preferred Securities, And Related Debentures) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Oct. 08, 2014	Dec. 31, 2013
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Principal Amount of Debentures	$169,788,000	[1]		$244,793,000	[1]
Bloomfield Hills Statutory Trust I [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Issuance Date	MayB 2004
Common Securities Issued	248,000
Trust Preferred Securities Issued	8,000,000	[2]
Coupon Rate	2.89%	[3]
Maturity	Jun-34
Principal Amount of Debentures	8,248,000	[1]		8,248,000	[1]
Private Bancorp Statutory Trust II [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Issuance Date	JuneB 2005
Common Securities Issued	1,547,000
Trust Preferred Securities Issued	50,000,000	[2]
Coupon Rate	1.95%	[3]
Maturity	Sept.B 2035
Principal Amount of Debentures	51,547,000	[1]		51,547,000	[1]
Private Bancorp Statutory Trust III [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Issuance Date	Dec.B 2005
Common Securities Issued	1,238,000
Trust Preferred Securities Issued	40,000,000	[2]
Coupon Rate	1.74%	[3]
Maturity	Dec.B 2035
Principal Amount of Debentures	41,238,000	[1]		41,238,000	[1]
Private Bancorp Capital Trust IV [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Issuance Date	MayB 2008
Common Securities Issued	5,000		5,225
Trust Preferred Securities Issued	68,750,000	[2]
Coupon Rate	10.00%	[3]
Maturity	Jun-68
Principal Amount of Debentures	68,755,000	[1]		143,760,000	[1]
TrustPreferredSecuritiesIssued [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Common Securities Issued	3,038,000
Trust Preferred Securities Issued	$166,750,000	[2]
Three Month Libor Plus Two Point Six Five Percentage [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Increment Over Libor Of Long Term Debt	2.65%
Three Month Libor Plus One Point Seven One Percentage [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Increment Over Libor Of Long Term Debt	1.71%
Three Month Libor Plus One Point Five Zero Percentage [Member]
Junior Subordinated Deferrable Interest Debentures Held By Trusts That Issued Guaranteed Capital Debt Securities [Line Items]
Increment Over Libor Of Long Term Debt	1.50%
[1]	The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the Debentures at maturity or upon their earlier redemption in whole or in part. The Debentures are redeemable in whole or in part prior to maturity at any time after the dates shown in the table and, only after we have obtained Federal Reserve approval, if then required under applicable guidelines or regulations.
[2]	The trust preferred securities accrue distributions at a rate equal to the interest rate on and have a maturity identical to that of the related Debentures. The trust preferred securities will be redeemed upon maturity or earlier redemption of the related Debentures.
[3]	Reflects the coupon rate in effect at DecemberB 31, 2014. The coupon rate for the Bloomfield Hills Statutory Trust I is a variable rate and is based on three-month LIBOR plus 2.65%. The coupon rates for the PrivateBancorp Statutory Trusts II and III are at a variable rate based on three-month LIBOR plus 1.71% for Trust II and three-month LIBOR plus 1.50% for Trust III. The coupon rate for the PrivateBancorp Capital Trust IV is fixed. Distributions for all of the Trusts are payable quarterly. We have the right to defer payment of interest on the Debentures at any time or from time to time for a period not exceeding ten years in the case of the Debentures held by Trust IV, and five years in the case of all other Debentures, without causing an event of default under the related indenture, provided no extension period may extend beyond the stated maturity of the Debentures. During such extension period, distributions on the trust preferred securities would also be deferred, and our ability to pay dividends on our common stock would generally be prohibited. The Federal Reserve has the ability to prevent interest payments on the Debentures.

Stockholders_Equity_Narrative_

Stockholders' Equity (Narrative) (Detail) (USD $)	1 Months Ended	12 Months Ended	3 Months Ended
	Oct. 26, 2012	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Nov. 14, 2012
Class of Stock [Line Items]
Share conversion from nonvoting to voting				1,580,000	1,950,000
Value of shares issued in public offering	$75,000,000	$70,657,000
Number of shares issued in public offering	4,761,905
Offering price per share in public offering	$15.75
Subordinated debt, net proceeds	125,000,000
Repurchase Cost of Warrant						1,200,000
Nonvoting Common Stock [Member]
Class of Stock [Line Items]
Common Stock, Shares, Outstanding				0	1,585,000
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Value of shares purchased by the U.S. Treasury			243,800,000
Number of shares purchased by the U.S. Treasury		243,815	243,815	0	0
Expected term of warrant			10 years
Accretion of preferred stock discount		$2,200,000
Preferred stock, Shares authorized				1,000,000	1,000,000
Preferred stock, Shares outstanding				0	0
Common Stock [Member]
Class of Stock [Line Items]
Common Stock, Shares, Outstanding				78,178,000	76,123,000
Treasury Stock, Shares				2,000	274,000

Stockholders_Equity_Schedule_o

Stockholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Unrealized Gain (Loss) on Available-for-Sale Securities [Abstract]
Increase in unrealized gains (losses) on securities	$11,244		($46,690)		($4,185)
Reclassification of net gains (losses) included in net income (loss)	-530		-1,174		-315
Net current period other comprehensive income (loss)	6,488		-29,259		-2,921
Accumulated Gain (Loss) on Effective Cash Flow Hedges
Net unrealized gains (losses) on cash flow hedges	16,777		-8,729		9,945
Reclassification of net gains (losses) included in net income (loss)	-9,262		-5,984		-2,928
Net current period other comprehensive income (loss)	4,585		-8,961		4,288
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of period	9,844		48,064		46,697
Increase in unrealized gains (losses) on securities	11,244		-46,690		-4,185
Net unrealized gains (losses) on cash flow hedges	16,777		-8,729		9,945
Tax benefit (expense) on increase in unrealized gains (losses)	-11,011		21,532		-2,428
Other comprehensive income (loss) before reclassifications	17,010		-33,887		3,332
Reclassification adjustment for tax expense on realized net gains	-9,792	[1]	-7,158	[1]	-3,243	[1]
Reclassification adjustments for tax expense on realized net gains	3,855	[2]	2,825	[2]	1,278	[2]
Amounts reclassified from accumulated other comprehensive income	-5,937		-4,333		-1,965
Net current period other comprehensive income (loss)	11,073		-38,220		1,367
Balance at end of period	20,917		9,844		48,064
Unrealized Gain (Loss) On Available-For-Sale Securities [Member]
Unrealized Gain (Loss) on Available-for-Sale Securities [Abstract]
Balance at beginning of period	12,960		42,219		45,140
Increase in unrealized gains (losses) on securities	11,244		-46,690		-4,185
Tax benefit (expense) on increase in unrealized gains (losses)	-4,435		18,142		1,455
Other comprehensive income (loss) before reclassifications	6,809		-28,548		-2,730
Reclassification of net gains (losses) included in net income (loss)	-530	[1]	-1,174	[1]	-315	[1]
Reclassification adjustment for tax expense (benefit) on realized net gains (losses)	209	[2]	463	[2]	124	[2]
Amounts reclassified from accumulated other comprehensive income (loss)	-321		-711		-191
Net current period other comprehensive income (loss)	6,488		-29,259		-2,921
Balance at end of period	19,448		12,960		42,219
Accumulated Other Comprehensive Income (Loss) [Abstract]
Increase in unrealized gains (losses) on securities	11,244		-46,690		-4,185
Accumulated Gain (Loss) on Effective Cash Flow Hedges [Member]
Accumulated Gain (Loss) on Effective Cash Flow Hedges
Accumulated unrealized gain (loss) balance at beginning of period	-3,116		5,845		1,557
Net unrealized gains (losses) on cash flow hedges	16,777		-8,729		9,945
Tax benefit (expense) on increase in unrealized gains (losses)	-6,576		3,390		-3,883
Other comprehensive income (loss) before reclassifications	10,201		-5,339		6,062
Reclassification of net gains (losses) included in net income (loss)	-9,262	[1]	-5,984	[1]	-2,928	[1]
Reclassification adjustment for tax expense on realized net gains	3,646	[2]	2,362	[2]	1,154	[2]
Amounts reclassified from accumulated other comprehensive income (loss)	-5,616		-3,622		-1,774
Net current period other comprehensive income (loss)	4,585		-8,961		4,288
Accumulated unrealized gain (loss) balance at end of period	1,469		-3,116		5,845
Accumulated Other Comprehensive Income (Loss) [Abstract]
Net unrealized gains (losses) on cash flow hedges	$16,777		($8,729)		$9,945
[1]	The amounts reclassified from AOCI for the available-for-sale securities are included in net securities gains on the Consolidated Statements of Income, while the amounts reclassified from AOCI for cash flow hedges are included in interest income on loans on the Consolidated Statements of Income.
[2]	The tax expense amounts reclassified from AOCI in connection with the available-for-sale securities reclassification and cash flow hedges reclassification are included in income tax provision on the Consolidated Statements of Income.

Earnings_Per_Common_Share_Basi

Earnings Per Common Share (Basic and Diluted Earnings Per Common Share) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Basic earnings per common share
Net income (loss)																	$153,079		$122,949		$77,896
Preferred stock dividends and discount accretion																	0		0		-13,368
Net income (loss) available to common stockholders	37,223	[1]	40,527	[1]	40,824	[1]	34,505	[1]	33,706	[1]	33,058	[1]	28,915	[1]	27,270	[1]	153,079		122,949		64,528
Net income allocated to participating stockholders																	-2,134	[2]	-2,436	[2]	-1,145	[2]
Net income allocated to common stockholders																	150,945		120,513		63,383
Weighted-average common shares outstanding																	77,007,000		76,398,000		71,951,000
Basic earnings per common share	$0.48	[1]	$0.52	[1]	$0.52	[1]	$0.44	[1]	$0.43	[1]	$0.42	[1]	$0.37	[1]	$0.35	[1]	$1.96		$1.58		$0.88
Diluted earnings per common share
Diluted earnings applicable to common stockholders																	$150,967	[3]	$120,520	[3]	$63,383	[3]
Weighted-average common shares outstanding																	77,007,000		76,398,000		71,951,000
Dilutive effect of stock awards																	815,000	[4]	247,000	[4]	223,000	[4]
Weighted-average diluted common shares outstanding																	77,822,000		76,645,000		72,174,000
Diluted earnings per common share	$0.47	[1]	$0.51	[1]	$0.52	[1]	$0.44	[1]	$0.43	[1]	$0.42	[1]	$0.37	[1]	$0.35	[1]	$1.94		$1.57		$0.88
Stock options [Member]
Diluted earnings per common share
Total antidilutive shares																	1,200,000		2,900,000		3,700,000
[1]	All ratios are presented on an annualized basis.
[2]	Participating stockholders are those that hold certain share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. Such shares or units are considered participating securities (i.e., certain of the Companybs deferred and restricted stock units and nonvested restricted stock awards).
[3]	Net income allocated to common stockholders for basic and diluted earnings per share may differ under the two-class method as a result of adding common stock equivalents for options to dilutive shares outstanding, which alters the ratio used to allocate earnings to common stockholders and participating securities for the purposes of calculating diluted earnings per share.
[4]	For the years ended DecemberB 31, 2014, 2013, and 2012, the weighted-average outstanding non-participating securities of 1.2 million, 2.9 million and 3.7 million shares, respectively, were not included in the computation of diluted earnings per common share because their inclusion would have been antidilutive for the periods presented.

Income_Taxes_Narrative_Detail

Income Taxes (Narrative) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$212,000	$347,000

Income_Taxes_Components_Of_Inc

Income Taxes (Components Of Income Taxes) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Current tax provision																	$103,312	$62,348	$38,693
Deferred tax provision (benefit)																	-8,184	14,646	15,828
Total income tax provision (benefit)	22,934	[1]	25,174	[1]	25,994	[1]	21,026	[1]	21,187	[1]	21,161	[1]	17,728	[1]	16,918	[1]	95,128	76,994	54,521
Federal [Member]
Income Taxes [Line Items]
Current tax provision																	86,234	51,169	31,521
Deferred tax provision (benefit)																	-7,392	11,749	11,668
State [Member]
Income Taxes [Line Items]
Current tax provision																	17,078	11,179	7,172
Deferred tax provision (benefit)																	($792)	$2,897	$4,160
[1]	All ratios are presented on an annualized basis.

Income_Taxes_Reconciliation_Of

Income Taxes (Reconciliation Of Income Tax Provision To Statutory Federal Rate) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax provision at statutory federal income tax rate																	$86,872	$69,980	$46,346
Increase (decrease) in taxes resulting from:
Tax exempt interest																	-2,139	-2,158	-1,956
Meals, entertainment and related expenses																	621	577	483
Bank owned life insurance																	-470	-473	-542
Investment credits																	-331	-331	-314
Non-deductible compensation																	148	172	1,880
State income taxes																	10,292	8,618	6,039
Share-based compensation charges																	0	200	2,468
Deferred tax asset adjustments																	504	500	1,136
Other																	-369	-91	-1,019
Total income tax provision (benefit)	$22,934	[1]	$25,174	[1]	$25,994	[1]	$21,026	[1]	$21,187	[1]	$21,161	[1]	$17,728	[1]	$16,918	[1]	$95,128	$76,994	$54,521
[1]	All ratios are presented on an annualized basis.

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets And Liabilities) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Allowance for loan losses	$64,832	$60,090
Share-based payment expenses	16,883	15,310
Deferred compensation	4,285	3,950
Loan fees	18,871	15,088
OREO write-downs and expenses	7,008	9,281
Nonaccrual interest income	1,874	2,505
Covered assets b loans and OREO	4,636	8,023
Other	3,426	5,579
Total deferred tax assets	121,815	119,826
Deferred tax liabilities:
Unrealized gain on securities available-for-sale	-12,450	-8,305
Intangible assets and acquisition adjustments	-7,504	-8,232
Premises and equipment	-1,889	-1,919
Covered assets b FDIC loss share receivable	-694	-2,482
Other	-1,094	-243
Total deferred tax liabilities	-23,631	-21,181
Net deferred tax assets	$98,184	$98,645

Income_Taxes_Roll_Forward_Of_U

Income Taxes (Roll Forward Of Unrecognized Tax Benefits) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Unrecognized Tax Benefits,Period Increase (Decrease) [Roll Forward]
Balance at beginning of year	$411		$179		$499
Additions for tax positions related to prior years	0		263		77
Reductions for tax positions related to prior years	-142		0		-380
Reductions for lapse of statute of limitations	0		-31		-17
Balance at end of year	269		411		179
Interest and penalties, net of tax effect, recognized in income tax (benefit) expense during the year	-6		33		-31
Interest and penalties, net of tax effect, accrued at year end (1)	$54	[1]	$60	[1]	$27	[1]
[1]	Not included in the unrecognized tax benefits roll forward presented above.

ShareBased_Compensation_And_Ot2

Share-Based Compensation And Other Benefits (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, years	3 years
Stock option agreement, term in years	10 years
weighted average fair value for discount of marketability	24.00%	21.00%	25.00%
Salary Stock Shares Issued			49,992
Weighted Averaged Issuance Price Of Salary Stock			$15.51
Fair Value Inputs, Discount for Lack of Marketability	0.00%
Maximum percentage of compensation employees contribute to "KSOP"	75.00%
Service requirement before employer contributions begin, years	1 year
Employer contribution amounts for each dollar contributed by the employee	$0.50
Maximum percentage of employer contribution	6.00%
Company's matching contribution vest in increments	20.00%
Required working hours per year for company's matching contribution	1,000
Period of time company's matching contribution vests, years	5 years
Maximum percentage deferred of annual base salary	50.00%
Maximum percentage deferred of annual bonus	100.00%
Deferred compensation plan, maximum percentage deferred of annual Directors fees	100.00%
Prime rate to federal long-term rate maximum allowable ratio	120.00%
DSUs	128,383	126,393
2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	6,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	3,500,000
Inactive plans [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0

ShareBased_Compensation_And_Ot3

Share-Based Compensation And Other Benefits (Effect Of Recognizing Share-Based Compensation Expense) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option expense	$3,710		$3,648		$7,620
Restricted stock and unit expense (including salary stock)	10,562		8,802		13,035
Performance Share Unit Expense	1,296		226		0
Total share-based compensation expense	15,568		12,676		20,655
Income tax benefit	-6,050		-4,818		-6,755
Share-based compensation expense, net of tax	9,518		7,858		13,900
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense:	3,391		4,576		4,302
Weighted-average amortization period remaining (in years)	1 year 7 months 6 days		1 year 9 months 18 days		1 year 10 months
Restricted Stock and Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense:	11,902		11,205		9,942
Weighted-average amortization period remaining (in years)	1 year 8 months 12 days		1 year 9 months 18 days		1 year 11 months
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense:	$2,694	[1]	$635	[1]	$0	[1]
Weighted-average amortization period remaining (in years)	2 years 0 months 0 days		2 years 2 months 12 days		0 years
[1]	Based on an estimate of the number of shares expected to vest as a result of actual performance against the performance criteria at DecemberB 31, 2014 and 2013. For additional information regarding our performance share units, refer to the "Performance Share Units" section further in this Note.

ShareBased_Compensation_And_Ot4

Share-Based Compensation And Other Benefits (Schedule Of Stock Option Transactions) (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of year	4,090		3,875		3,627
Options granted	203		652		646
Options exercised	-277		-200		-95
Options forfeited	-15		-86		-63
Options expired	-132		-151		-240
Options outstanding at end of year	3,869		4,090		3,875
Options exercisable at end of year	2,853		2,890		2,829
Ending vested and expected to vest	3,771
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-average exercise price outstanding at beginning of year	$23.66		$24.40		$26.15
Weighted-average exercise price granted	$27.98		$18.10		$14.43
Weighted-average exercise price exercised	$18.59		$14.52		$9.59
Weighted-average exercise price forfeited	$18.82		$17.43		$24.27
Weighted-average exercise price expired	$34.09		$34.10		$29.94
Weighted-average exercise price outstanding at end of year	$23.92		$23.66		$24.40
Weighted-average exercise price exercisable at end of year	$25.55		$26.68		$28.05
Weighted-average exercise price ending vested and expected to vest	$23.98
Weighted average remaining contractual life outstanding at end of year	5 years 0 months 0 days	[1]	5 years 8 months 12 days	[1]	6 years 1 month	[1]
Weighted-average remaining contractual life exercisable at end of year	3 years 10 months 24 days	[1]	4 years 6 months	[1]	5 years 1 month	[1]
Weighted average remaining contractual life ending vested and expected to vest	4 years 10 months 24 days	[1]
Aggregate intrinsic value outstanding at end of year	$38,163	[2]	$27,255	[2]	$1,381	[2]
Aggregate intrinsic value exercisable at end of year	23,879	[2]	12,220	[2]	541	[2]
Aggregate intrinsic value ending vested and expected to vest	$36,999	[2]
[1]	Represents the average contractual life remaining in years.
[2]	Aggregate intrinsic value represents the total pretax intrinsic value of the "in-the-money" stock options, (i.e., the difference between our closing stock price on the last trading day of the respective year and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the respective year. This amount will fluctuate with changes in the fair value of our common stock.

ShareBased_Compensation_And_Ot5

Share-Based Compensation And Other Benefits (Summary Of Stock Options Outstanding) (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Outstanding Options, Shares	3,869
Outstanding Options, Weighted-Average, Remaining Contractual Life, Years	5 years 0 months 0 days	[1]
Outstanding Options, Weighted-Average, Exercise Price	$23.92
Exercisable Options, Shares	2,853
Exercisable Options, Weighted-Average Exercise Price	$25.55
$6.92 - $14.91 [Member]
Range of Exercise Price, Lower limit	$6.92
Range of Exercise Price, Upper limit	$14.91
Outstanding Options, Shares	583
Outstanding Options, Weighted-Average, Remaining Contractual Life, Years	6 years 8 months 12 days	[1]
Outstanding Options, Weighted-Average, Exercise Price	$13.98
Exercisable Options, Shares	398
Exercisable Options, Weighted-Average Exercise Price	$13.79
$14.92 - $18.67 [Member]
Range of Exercise Price, Lower limit	$14.92
Range of Exercise Price, Upper limit	$18.67
Outstanding Options, Shares	1,023
Outstanding Options, Weighted-Average, Remaining Contractual Life, Years	7 years 4 months 24 days	[1]
Outstanding Options, Weighted-Average, Exercise Price	$16.74
Exercisable Options, Shares	415
Exercisable Options, Weighted-Average Exercise Price	$15.02
$18.68 - $26.37 [Member]
Range of Exercise Price, Lower limit	$18.68
Range of Exercise Price, Upper limit	$26.37
Outstanding Options, Shares	908
Outstanding Options, Weighted-Average, Remaining Contractual Life, Years	3 years 0 months 0 days	[1]
Outstanding Options, Weighted-Average, Exercise Price	$25.98
Exercisable Options, Shares	887
Exercisable Options, Weighted-Average Exercise Price	$26.09
$26.38 - $32.19 [Member]
Range of Exercise Price, Lower limit	$26.38
Range of Exercise Price, Upper limit	$32.19
Outstanding Options, Shares	746
Outstanding Options, Weighted-Average, Remaining Contractual Life, Years	4 years 9 months 18 days	[1]
Outstanding Options, Weighted-Average, Exercise Price	$29.61
Exercisable Options, Shares	545
Exercisable Options, Weighted-Average Exercise Price	$30.23
$32.20 - $46.51 [Member]
Range of Exercise Price, Lower limit	$32.20
Range of Exercise Price, Upper limit	$46.51
Outstanding Options, Shares	609
Outstanding Options, Weighted-Average, Remaining Contractual Life, Years	2 years 9 months 18 days	[1]
Outstanding Options, Weighted-Average, Exercise Price	$35.43
Exercisable Options, Shares	608
Exercisable Options, Weighted-Average Exercise Price	$35.43
[1]	Represents the weighted-average contractual life remaining in years.

ShareBased_Compensation_And_Ot6

Share-Based Compensation And Other Benefits (Schedule Of Stock Option Valuation Assumptions) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted-average fair value of options at their grant date	$12.20	$7.79	$6.52
Minimum [Member]
Expected life of the option (in years)	6 years 0 months 0 days	5 years 4 months 25 days	4 years 7 months 6 days
Expected stock volatility	43.30%	44.00%	44.70%
Risk-free interest rate	1.80%	1.00%	1.60%
Expected dividend yield	0.10%	0.10%	0.20%
Maximum [Member]
Expected life of the option (in years)	6 years 0 months 11 days	6 years 3 months 19 days	5 years 7 months 6 days
Expected stock volatility	44.30%	45.20%	49.80%
Risk-free interest rate	2.10%	2.10%	2.40%
Expected dividend yield	10.00%	0.20%	0.30%

ShareBased_Compensation_And_Ot7

Share-Based Compensation And Other Benefits (Schedule Of Other Stock Option Information) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation [Abstract]
Total intrinsic value of stock options exercised	$3,204		$1,402		$511
Cash received from stock options exercised	5,149		2,847		312
Income tax benefit realized from stock options exercised	$1,217	[1]	$502	[1]	$199	[1]
[1]	Amounts may be more or less than deferred tax benefit recorded during vesting period.

ShareBased_Compensation_And_Ot8

Share-Based Compensation And Other Benefits (Restricted Stock And Unit Award Transactions) (Detail) (Restricted Stock and Unit Awards [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Restricted Stock and Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested unit awards at beginning of year	1,268		1,114	[1]	1,060	[1]
Number of units granted	431		676		841	[1]
Number of units vested	-577		-444		-733	[1]
Number of units forfeited	-29		-78		-54	[1]
Nonvested unit awards at end of year	1,093		1,268		1,114	[1]
Vested, but not issued at end of year	164	[2]	136	[2]	110	[1],[2]
Nonvested restricted stock unit awards at beginning of year weighted average grant date fair value	$15.76	[3]	$14.42	[1],[3]	$20.84	[1],[3]
Weighted average grant date fair value granted	$27.15	[3]	$17.14	[3]	$14.41	[1],[3]
Weighted average grant date fair value vested	$15.62	[3]	$14.53	[3]	$23.37	[1],[3]
Weighted average grant date fair value forfeited	$21.51	[3]	$15.70	[3]	$18.81	[1],[3]
Nonvested restricted stock unit awards at end of year weighted average grant date fair value	$20.18	[3]	$15.76	[3]	$14.42	[1],[3]
Vested, but not issued at end of year, Weighted-Average Grant Date Fair Value	$16.56	[2],[3]	$16.52	[2],[3]	$16.89	[1],[2],[3]
[1]	Includes 49,992 shares of salary stock awards issued in connection with compensation restrictions under the TARP CPP at an average price of $15.51 per share. The salary stock was fully vested upon issuance with all of the rights of a stockholder, including the right to vote and receive dividends but was restricted from sale or transfer for a period of 36 months after issuance, except in the event of death or disability.
[2]	Represents restricted stock units with a delayed settlement date.
[3]	Includes the effect of the DLOM.

ShareBased_Compensation_And_Ot9

Share-Based Compensation And Other Benefits (Other Restricted Stock And Unit Award Information) (Detail) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Total fair value of vested/released restricted stock and units	$16,135		$7,662		$10,674
Current income tax benefit realized from vesting/release of restricted stock and unit awards	$6,036	[1]	$2,714	[1]	$2,919	[1]
[1]	Amount may be more or less than deferred tax benefit recorded during vesting period.

Recovered_Sheet10

SHARE-BASED COMPENSATION AND OTHER BENEFITS Share-Based Compensation And Other Benefits (Performance Share Units Activity) (Detail) (Performance Shares [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Performance Shares [Member]
Nonvested unit awards at beginning of year	54	[1]	0	[1]
Performance Share Units Granted	99	[1]	54	[1]
Performance awards forfeited	-3	[1]	0	[1]
Nonvested unit awards at end of year	150	[1]	54	[1]
Nonvested restricted stock unit awards at beginning of year weighted average grant date fair value	$15.44	[1],[2]	$0	[1],[2]
Nonvested performance share unit awards granted weighted average grant date fair value	$26	[1],[2]	$15.44	[1],[2]
Nonvested performance share unites awards forfeited weighted average grant date fair value	$26	[1],[2]	$0	[1],[2]
Nonvested performance share unit awards end of year weighted average grant date fair value	$22.19	[1],[2]	$15.44	[1],[2]
[1]	Presented at target level of performance.
[2]	Includes the effect of a 20% DLOM on awards granted in each 2014 and 2013.

Recovered_Sheet11

Share-Based Compensation And Other Benefits (KSOP Plan Information) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation [Abstract]
Company matching contribution	$2,509	$2,405	$2,164
Number of Company shares held in KSOP	373	394	411
Fair value of Company shares held by KSOP	12,472	11,412	6,298
Dividends received	$16	$16	$17

Regulatory_And_Capital_Matters2

Regulatory And Capital Matters (Narrative) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]
Reserve balances required to be maintained with the FRB	$178.70	$123.40
Maximum percentage loans or advances to single subsidiary	10.00%
Maximum percentage loans or advances to all subsidiaries	20.00%
Dividend income from subsidiaries	100
Capacity under banking regulation to pay dividends subject to prior regulatory approval	$534.80

Regulatory_And_Capital_Matters3

Regulatory And Capital Matters (Capital Measurements) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Actual [Member] | Consolidated [Member]
Capital Unit [Line Items]
Total risk-based capital	$1,825,542	$1,720,740
Total risk-based ratio	12.51%	13.30%
Tier 1 risk-based capital	1,530,579	1,433,920
Tier 1 risk-based ratio	10.49%	11.08%
Tier 1 leverage capital	1,530,579	1,433,920
Tier 1 leverage ratio	9.96%	10.37%
Actual [Member] | The PrivateBank [Member]
Capital Unit [Line Items]
Total risk-based capital	1,740,736	1,637,376
Total risk-based ratio	11.95%	12.69%
Tier 1 risk-based capital	1,570,773	1,475,958
Tier 1 risk-based ratio	10.79%	11.44%
Tier 1 leverage capital	1,570,773	1,475,958
Tier 1 leverage ratio	10.24%	10.70%
FRB Guidelines For Minimum Regulatory Capital [Member] | Consolidated [Member]
Capital Unit [Line Items]
Total risk-based capital, FRB minimum	1,167,412	1,035,086
Total risk-based ratio, FRB minimum	8.00%	8.00%
Tier 1 risk base capital, FRB minimum	583,706	517,543
Tier 1 risk-based ratio, FRB minimum	4.00%	4.00%
Tier 1 leverage-based capital, FRB minimum	614,996	552,839
Tier 1 leverage-based ratio, FRB minimum	4.00%	4.00%
Regulatory Minimum For Well Capitalized Under FDICIA [Member] | The PrivateBank [Member]
Capital Unit [Line Items]
Total risk-based capital, FDICIA minimum	1,456,366	1,290,606
Total risk-based ratio, FDICIA Minimum	10.00%	10.00%
Tier 1 risk based capital, FDICIA minimum	873,820	774,363
Tier 1 risk-based capital ratio, FDICIA minimum	6.00%	6.00%
Tier 1 leverage capital, FDICIA minimum	$767,278	$689,432
Tier 1 leverage-based ratio, FDICIA minimum	5.00%	5.00%

Derivative_Instruments_Notiona

Derivative Instruments (Notional Amounts and Fair Value of Derivative Instruments) (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]
Interest rate contracts, cash flow hedging, asset derivatives	$4,542		$4,005
Derivatives, not designated as hedging, asset derivatives	49,108		57,575
Netting adjustments, asset derivatives	-10,588	[1],[2]	-13,158	[1],[2]
Derivative assets	43,062		48,422
Interest rate contracts, cash flow hedging, liability derivatives	2,715		9,748
Derivatives, not designated as hedging, liability derivatives	49,321		57,919
Netting adjustments, liability derivatives	-25,269	[1],[2]	-18,777	[1],[2]
Total derivatives, liability derivatives	26,767		48,890
Client-Related Derivatives [Member]
Derivative [Line Items]
Interest rate contracts, not designated as hedging, asset derivative	42,879		54,155
Foreign exchange contracts, not designated as hedging, asset derivatives	5,183		3,029
Credit contracts, not designated as hedging, asset derivatives	19		34
Derivatives, not designated as hedging, asset derivatives	48,081		57,218
Interest rate contracts, not designated as hedging, liability derivatives	43,792		54,930
Foreign exchange contracts, not designated as hedging, liability derivatives	4,659		2,570
Credit contracts, not designated as hedging, liability derivatives	24		98
Derivatives, not designated as hedging, liability derivatives	48,475		57,598
Other End User Derivatives [Member]
Derivative [Line Items]
Foreign exchange contracts, not designated as hedging, asset derivatives	241		16
Mortgage banking derivatives, not designated as hedging, asset derivatives	786		341
Derivatives, not designated as hedging, asset derivatives	1,027		357
Foreign exchange contracts, not designated as hedging, liability derivatives	45		218
Mortgage banking derivatives, not designated as hedging, liability derivatives	801		103
Derivatives, not designated as hedging, liability derivatives	846		321
Interest Rate Contract [Member]
Derivative [Line Items]
Netting adjustments, asset derivatives	-7,433	[1]	-12,371	[1]
Netting adjustments, liability derivatives	-24,067	[1]	-17,990	[1]
Foreign Exchange Contract [Member]
Derivative [Line Items]
Netting adjustments, asset derivatives	-3,154	[1]	-767	[1]
Netting adjustments, liability derivatives	-1,202	[1]	-767	[1]
Credit Contracts [Member]
Derivative [Line Items]
Netting adjustments, asset derivatives	-1	[1]	-20	[1]
Netting adjustments, liability derivatives	0	[1]	-20	[1]
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount, asset derivatives	550,000	[3]	350,000	[3]
Notional amount, liability derivatives	250,000	[3]	325,000	[3]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Client-Related Derivatives [Member]
Derivative [Line Items]
Notional amount, asset derivatives	3,881,202	[3]	3,959,328	[3]
Notional amount, liability derivatives	3,743,827	[3]	3,959,328	[3]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Client-Related Derivatives [Member]
Derivative [Line Items]
Notional amount, asset derivatives	98,285	[3]	116,761	[3]
Notional amount, liability derivatives	86,582	[3]	116,761	[3]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other End User Derivatives [Member]
Derivative [Line Items]
Notional amount, asset derivatives	18,551	[3]	5,436	[3]
Notional amount, liability derivatives	2,892	[3]	7,041	[3]
Not Designated as Hedging Instrument [Member] | Credit Contracts [Member] | Client-Related Derivatives [Member]
Derivative [Line Items]
Notional amount, asset derivatives	98,478	[3]	91,694	[3]
Notional amount, liability derivatives	$100,941	[3]	$113,348	[3]
[1]	Represents end-user, client-related and cash flow hedging derivative contracts and related cash collateral entered into with the same counterparty and subject to a master netting agreement.
[2]	Represents netting of derivative asset and liability balances, and related cash collateral, with the same counterparty subject to master netting agreements.
[3]	The remaining average notional amounts are shown for credit contracts.

Derivative_Instruments_Narrati

Derivative Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Cash collateral pledged, offset against related derivative liabilities	$14,700,000
Cash collateral received, offset against related derivative assets	0
Receivable for cash pledged, not offset against derivative fair values under master netting agreement	0
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	0
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	5 years
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net	0
Net deferred gains (losses), net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months	5,300,000
Gain (Loss) from Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0
Interest rate lock commitments	44,700,000
Forward commitments for the future delivery of residential mortgage loans	86,900,000
Foreign currency risk on loans	16,200,000
Mortgage Receivable [Member]
Derivative [Line Items]
Mortgage loans held-for-sale, par value	$42,199,000	$17,857,000

DERIVATIVE_INSTRUMENTS_Derivat

DERIVATIVE INSTRUMENTS Derivative Instruments (Offsetting of Derivative Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative Assets [Abstract]
Derivative Asset, Gross, Subject to a master netting agreement	$51,104	[1]	$59,492	[1]
Derivative Asset, Not Subject to Master Netting Arrangement	2,546	[1]	2,088	[1]
Total Derivative Asset, Gross, Including Not Subject to Master Netting Arrangement	53,650	[1]	61,580	[1]
Derivative assets, Gross Amounts Offset	-10,588	[2],[3]	-13,158	[2],[3]
Derivative Assets, net, subject to master netting adjustment	40,516		46,334
Derivative assets	43,062		48,422
Derivative assets, Collateral, Obligation to Return Securities	0	[4],[5]	0	[4],[5]
Derivative assets, Collateral, Obligation to Return Cash Collateral	0	[4]	0	[4]
Derivative Asset,Amount Offset Against Collateral, Subject to Master Netting Agreement	40,516		46,334
Total Derivative Asset, Amount Offset Against Collateral, including not subject to master netting agreement	43,062		48,422
Derivative Liabilities [Abstract]
Derivative Liabilities, Gross, subject to master netting agreement	48,952	[1]	67,238	[1]
Derivative Liabilities, Not Subject to Master Netting Agreement	3,084	[1]	429	[1]
Total Derivative Liabilities, gross, Including Not Subject To A Master Netting Agreement	52,036	[1]	67,667	[1]
Derivative liabilities, Gross Amounts Offset	-25,269	[2],[3]	-18,777	[2],[3]
Derivative Liabilities, net, subject to master netting agreement	23,683		48,461
Derivative liabilities	26,767		48,890
Derivative Liabilities, Collateral, Right to Reclaim Financial Securities	-18,739	[4],[5]	-42,756	[4],[5]
Derivative, Collateral, Right to Reclaim Cash	0	[4]	0	[4]
Derivative Liabilities, Amount Offset Against Collateral, Subject to Master Netting Agreement	4,944		5,705
Total Derivative Liabilities, Amount Offset Against Collateral, including not subject to master netting agreement	8,028		6,134
Interest Rate Contract [Member]
Derivative Assets [Abstract]
Derivative Asset, Gross, Subject to a master netting agreement	47,421	[1]	58,160	[1]
Derivative assets, Gross Amounts Offset	-7,433	[2]	-12,371	[2]
Derivative Assets, net, subject to master netting adjustment	39,988		45,789
Derivative Asset,Amount Offset Against Collateral, Subject to Master Netting Agreement	39,988		45,789
Derivative Liabilities [Abstract]
Derivative Liabilities, Gross, subject to master netting agreement	46,507	[1]	64,678	[1]
Derivative liabilities, Gross Amounts Offset	-24,067	[2]	-17,990	[2]
Derivative Liabilities, net, subject to master netting agreement	22,440		46,688
Derivative Liabilities, Collateral, Right to Reclaim Financial Securities	-17,755	[4],[5]	-41,192	[4],[5]
Derivative Liabilities, Amount Offset Against Collateral, Subject to Master Netting Agreement	4,685		5,496
Foreign Exchange Contract [Member]
Derivative Assets [Abstract]
Derivative Asset, Gross, Subject to a master netting agreement	3,664	[1]	1,298	[1]
Derivative assets, Gross Amounts Offset	-3,154	[2]	-767	[2]
Derivative Assets, net, subject to master netting adjustment	510		531
Derivative Asset,Amount Offset Against Collateral, Subject to Master Netting Agreement	510		531
Derivative Liabilities [Abstract]
Derivative Liabilities, Gross, subject to master netting agreement	2,421	[1]	2,462	[1]
Derivative liabilities, Gross Amounts Offset	-1,202	[2]	-767	[2]
Derivative Liabilities, net, subject to master netting agreement	1,219		1,695
Derivative Liabilities, Collateral, Right to Reclaim Financial Securities	-965	[4],[5]	-1,495	[4],[5]
Derivative Liabilities, Amount Offset Against Collateral, Subject to Master Netting Agreement	254		200
Credit Contracts [Member]
Derivative Assets [Abstract]
Derivative Asset, Gross, Subject to a master netting agreement	19	[1]	34	[1]
Derivative assets, Gross Amounts Offset	-1	[2]	-20	[2]
Derivative Assets, net, subject to master netting adjustment	18		14
Derivative Asset,Amount Offset Against Collateral, Subject to Master Netting Agreement	18		14
Derivative Liabilities [Abstract]
Derivative Liabilities, Gross, subject to master netting agreement	24	[1]	98	[1]
Derivative liabilities, Gross Amounts Offset	0	[2]	-20	[2]
Derivative Liabilities, net, subject to master netting agreement	24		78
Derivative Liabilities, Collateral, Right to Reclaim Financial Securities	-19	[4],[5]	-69	[4],[5]
Derivative Liabilities, Amount Offset Against Collateral, Subject to Master Netting Agreement	$5		$9
[1]	All derivative contracts are over-the-counter contracts.
[2]	Represents end-user, client-related and cash flow hedging derivative contracts and related cash collateral entered into with the same counterparty and subject to a master netting agreement.
[3]	Represents netting of derivative asset and liability balances, and related cash collateral, with the same counterparty subject to master netting agreements.
[4]	Collateralization is determined at the counterparty level. If overcollateralization exists, the amount shown is limited to the fair value of the derivative.
[5]	Financial instruments are disclosed at fair value. Financial instrument collateral is allocated pro-rata amongst the derivative liabilities to which it relates.

DERIVATIVE_INSTRUMENTS_Derivat1

DERIVATIVE INSTRUMENTS Derivative Instruments (Derivatives Subject to Credit Risk Contingency Features) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Description of Credit Risk Related Contingent Features [Abstract]
Fair value of derivatives with credit contingency features in a net liability position	$14,596	$28,152
Collateral posted for those transactions in a net liability position	16,865	30,272
If credit risk contingency features were triggered: [Abstract]
Additional collateral required to be posted to derivative counterparties	0	0
Outstanding derivative instruments that would be immediately settled	$14,596	$28,152

Derivative_Instruments_Change_

Derivative Instruments (Change In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedge) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pre-tax [Roll Forward]
Amount of gain (loss) recognized in AOCI (effective portion), pre-tax	$16,777	($8,729)	$9,945
Amount reclassified from AOCI to interest income on loans, pre-tax	-9,262	-5,984	-2,928
Interest Rate Contract [Member]
Pre-tax [Roll Forward]
Accumulated unrealized gain (loss) at beginning of period, pretax	-5,110	9,603
Amount of gain (loss) recognized in AOCI (effective portion), pre-tax	16,777	-8,729
Amount reclassified from AOCI to interest income on loans, pre-tax	-9,262	-5,984
Accumulated unrealized gain (loss) at end of period, pretax	2,405	-5,110
After-tax [Roll Forward]
Accumulated unrealized gain (loss) balance at beginning of period	-3,116	5,845
Amount of gain (loss) recognized in AOCI (effective portion), after-tax	10,201	-5,339
Amount reclassified from AOCI to interest income on loans, after-tax	-5,616	-3,622
Accumulated unrealized gain (loss) balance at end of period	$1,469	($3,116)

Derivative_Instruments_Risk_Pa

Derivative Instruments (Risk Participation Agreements) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Fair value of written RPAs	$24	$98
Maximum potential amount of future undiscounted payments	$3,927	$3,263
Percent of maximum potential amount of future undiscounted payments covered by proceeds from liquidation of pledged collateral	25.00%	16.00%
Minimum [Member]
Derivative [Line Items]
Range of remaining terms to maturity (in years)	1 year	1 year
Range of assigned internal risk ratings	2	2
Maximum [Member]
Derivative [Line Items]
Range of remaining terms to maturity (in years)	4 years	4 years
Range of assigned internal risk ratings	7	7

Derivative_Instruments_Gain_Lo

Derivative Instruments (Gain (Loss) Recognized On Derivative Instruments Not Designated In Hedging Relationship) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Gain on client-related derivatives recognized in capital markets products income	$18,047	$20,728	$25,958
Gain (loss) on end-user derivatives recognized in other income	1,149	360	-213
Total gain recognized on derivatives not designated in hedging relationship	19,196	21,088	25,745
Interest Rate Contract [Member]
Derivative [Line Items]
Gain on client-related derivatives recognized in capital markets products income	10,634	14,226	19,613
Foreign Exchange Contract [Member]
Derivative [Line Items]
Gain on client-related derivatives recognized in capital markets products income	7,068	6,506	6,024
Gain (loss) on end-user derivatives recognized in other income	1,402	125	-336
Credit Contracts [Member]
Derivative [Line Items]
Gain on client-related derivatives recognized in capital markets products income	345	-4	321
Mortgage Banking Derivatives [Member]
Derivative [Line Items]
Gain (loss) on end-user derivatives recognized in other income	($253)	$235	$123

Recovered_Sheet12

Commitments, Guarantees, And Contingent Liabilities (Contractual Or Notional Amounts Of Financial Instruments) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Commitments Guarantees And Contingent Liabilities [Line Items]
Commitments to extend credit	$5,898,958,000	[1]	$4,706,992,000	[1]
Letters of credit	377,566,000	[1]	340,009,000	[1]
Covered asset commitments	11,000,000		18,700,000
Financial standby [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Letters of credit	334,175,000		308,577,000
Performance standby [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Letters of credit	38,167,000		26,932,000
Commercial letters of credit [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Letters of credit	5,224,000		4,500,000
Home equity lines [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Commitments to extend credit	129,943,000		139,116,000
Residential 1 to 4 Family Construction [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Commitments to extend credit	53,847,000		32,714,000
Commercial real estate, other construction and land development [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Commitments to extend credit	1,123,123,000		703,382,000
Commercial and industrial [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Commitments to extend credit	4,255,422,000		3,609,443,000
All other commitments [Member]
Commitments Guarantees And Contingent Liabilities [Line Items]
Commitments to extend credit	$336,623,000		$222,337,000
[1]	Includes covered loan commitments of $11.0 million and $18.7 million as of DecemberB 31, 2014 and 2013, respectively.

Recovered_Sheet13

Commitments, Guarantees, And Contingent Liabilities (Narrative) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Disclosure Commitments Guarantees And Contingent Liabilities Narrative [Abstract]
Reserve for unfunded commitments, included in other liabilities	$12.30
Unamortized fees associated with standby letters of credit, included in other liabilities	1.4
Remaining weighted-average term, standby letters of credit	14 months
Remaining Actual Lives, Standby Letters of Credit, Minimum	1 year
Remaining Actual Lives Standby Letters Of Credit Maximum	6 years
Contributions to other investment partnerships	21.6
Tax-credit investments	8.9
Maximum potential future payments guaranteed, third-party settlement	$11.50

Recovered_Sheet14

Estimated Fair Value Of Financial Instruments (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal value to be reviewed	$250,000
Appraisal value subject to technical review	1,000,000
Transfers of Assets and Liabilities Between Fair Value Hierarchy Level 1 and Level 2	0
Other loans held-for-sale	72,946,000	[1]	9,197,000	[1]
Participating Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held-for-sale	36,600,000
Branch Closing, Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held-for-sale	$36,300,000
[1]	Amounts at DecemberB 31, 2014 consists of $36.6 million of commercial, commercial real estate and construction loans carried at the lower of aggregate cost or fair value and $36.3 million of commercial, commercial real estate, construction, home equity and personal loans held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia, which closed in January 2015. Amounts at DecemberB 31, 2013 represent commercial loans carried at the lower of aggregate cost or fair value. Generally, the Company intends to sell these loans within 30-60 days from the date the intent to sell was established.

Recovered_Sheet15

Estimated Fair Value Of Financial Instruments (Fair Value Measurements On A Recurring Basis) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	$1,645,344		$1,602,476
Mortgages loans held-for-sale	42,215		17,619
Interest rate asset contract derivatives designated as hedging instruments	4,542		4,005
Derivative assets not designated as hedging instruments	49,108		57,575
Netting adjustments, asset derivatives	-10,588	[1],[2]	-13,158	[1],[2]
Derivative assets	43,062		48,422
Total assets, recurring	1,730,621		1,668,517
Interest rate liability contract derivatives designated as hedging instruments	2,715		9,748
Netting adjustments, liability derivatives	-25,269	[1],[2]	-18,777	[1],[2]
Derivative liabilities	26,767		48,890
Fair Value, Inputs, Level 1 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	268,265		142,575
Derivative assets			0
Total assets, recurring	268,265		142,575
Derivative liabilities			0
Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	1,377,079		1,459,901
Mortgages loans held-for-sale	42,215		17,619
Interest rate asset contract derivatives designated as hedging instruments	4,542		4,005
Netting adjustments, asset derivatives	-9,952		-13,138
Derivative assets	42,286		47,994
Total assets, recurring	1,461,580		1,525,514
Interest rate liability contract derivatives designated as hedging instruments	2,715		9,748
Netting adjustments, liability derivatives	-24,633		-18,757
Derivative liabilities	26,727		48,812
Fair Value, Inputs, Level 3 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale			0
Netting adjustments, asset derivatives	-636		-20
Derivative assets	776		428
Total assets, recurring	776		428
Netting adjustments, liability derivatives	-636		-20
Derivative liabilities	40		78
U.S. Treasury Securities [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	268,265		142,575
U.S. Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	268,265		142,575
U.S. Agencies Securities [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	46,258		45,528
U.S. Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	46,258		45,528
Collateralized Mortgage Obligations [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	136,933		176,116
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	136,933		176,116
Residential Mortgage-Backed Securities [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	846,078		963,107
Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	846,078		963,107
State And Municipal Securities [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	347,310		274,650
State And Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	347,310		274,650
Foreign Government Debt Securities [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	500		500
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Securities available-for-sale	500		500
Client-Related Derivatives [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Derivative assets not designated as hedging instruments	48,081		57,218
Derivatives liabilities not designated as hedging instruments	48,475		57,598
Client-Related Derivatives [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Derivative assets not designated as hedging instruments	46,669		56,770
Derivatives liabilities not designated as hedging instruments	47,799		57,500
Client-Related Derivatives [Member] | Fair Value, Inputs, Level 3 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Derivative assets not designated as hedging instruments	1,412		448
Derivatives liabilities not designated as hedging instruments	676		98
Other End User Derivatives [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Derivative assets not designated as hedging instruments	1,027		357
Derivatives liabilities not designated as hedging instruments	846		321
Other End User Derivatives [Member] | Fair Value, Inputs, Level 2 [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Derivative assets not designated as hedging instruments	1,027		357
Derivatives liabilities not designated as hedging instruments	$846		$321
[1]	Represents end-user, client-related and cash flow hedging derivative contracts and related cash collateral entered into with the same counterparty and subject to a master netting agreement.
[2]	Represents netting of derivative asset and liability balances, and related cash collateral, with the same counterparty subject to master netting agreements.

Estimated_Fair_Value_Of_Financ2

Estimated Fair Value Of Financial Instruments (Reconciliation Of Beginning And Ending Fair Value For Those Fair Value Measurements Using Significant Unobservable Inputs) (Level 3) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Derivative Assets
Estimated Fair Value of Financial Instruments [Roll Forward]
Balance at beginning of period	$448	[1]	$1,023	[1]
Total gains (losses) included in earnings	455	[1],[2]	126	[1],[2]
Issuances	0	[1]	0	[1]
Settlements	-1,487	[1]	-841	[1]
Transfers into Level 3 (out of Level 2)	2,717	[1],[3]	575	[1],[3]
Transfers out of Level 3 (into Level 2)	-721	[1],[3]	-435	[1],[3]
Balance at end of period	1,412	[1]	448	[1]
Change in unrealized gains (losses) in earnings relating to assets and liabilities still held at end of year	353	[1]	-19	[1]
Derivative Liabilities
Estimated Fair Value of Financial Instruments [Roll Forward]
Balance at beginning of period	-98	[1]	-60	[1]
Total gains (losses) included in earnings	660	[1],[2]	-14	[1],[2]
Issuances	0	[1]	-51	[1]
Settlements	-24	[1]	0	[1]
Transfers into Level 3 (out of Level 2)	-1,411	[1],[3]	0	[1],[3]
Transfers out of Level 3 (into Level 2)	197	[1],[3]	27	[1],[3]
Balance at end of period	-676	[1]	-98	[1]
Change in unrealized gains (losses) in earnings relating to assets and liabilities still held at end of year	$102	[1]	($21)	[1]
[1]	Fair value is presented prior to giving effect to netting adjustments.
[2]	Amounts disclosed in this line are included in the Consolidated Statements of Income as capital markets products income for derivatives.
[3]	Transfers in and transfers out are recognized at the end of each quarterly reporting period. In general, derivative assets and liabilities are transferred into Level 3 from Level 2 due to a lack of observable market data, as there was deterioration in the credit risk of the derivative counterparty. Conversely, derivative assets and liabilities are transferred out of Level 3 into Level 2 due to an improvement in the credit risk of the derivative counterparty.

Estimated_Fair_Value_Of_Financ3

Estimated Fair Value Of Financial Instruments (Difference Between Aggregate Fair Value And Aggregate Remaining Principle Balance for Mortgage Loans Held-For-Sale Elected to be Carried at Fair Value) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Estimated Fair Value Of Financial Instruments [Line Items]
Mortgages loans held-for-sale, Aggregate fair value	$42,215		$17,619
Mortgage Receivable [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Mortgage loans held-for-sale, Aggregate unpaid principal balance	42,199		17,857
Assets Held-for-sale [Member] | Mortgage Receivable [Member]
Estimated Fair Value Of Financial Instruments [Line Items]
Mortgages loans held-for-sale, Difference	($16)	[1]	$238	[1]
[1]	The change in fair value is reflected in mortgage banking non-interest income.

Estimated_Fair_Value_Of_Financ4

Estimated Fair Value Of Financial Instruments (Fair Value Measurements On A Nonrecurring Basis) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Disclosure Estimated Fair Value Of Financial Instruments Fair Value Measurements On A Nonrecurring Basis [Abstract]
Collateral-dependent impaired loans, Fair Value	$34,192	[1]	$45,937	[1]
Covered assets - OREO, Fair value	143	[2],[3]	6,044	[2],[3]
OREO, Fair Value	8,657	[2]	18,764	[2]
Total, Fair Value	42,992		70,745
Collateral-dependent impaired loans, Losses	5,440	[1]	4,656	[1]
Covered assets - OREO, Losses	5	[2],[3]	532	[2],[3]
OREO, Losses	5,817	[2]	12,711	[2]
Total, Losses	$11,262		$17,899
Percentage of non-reimbursable portion under loss share agreement	20.00%
[1]	Represents the fair value of loans adjusted to the appraised value of the collateral with a write-down in fair value or change in specific reserves during the respective period. These fair value adjustments are recorded against the allowance for loan losses.
[2]	Represents the fair value of foreclosed properties that were adjusted subsequent to their initial classification as foreclosed assets. Write-downs are recognized as a component of net foreclosed real estate expense in the Consolidated Statements of Income.
[3]	The 20% portion of any covered asset OREO write-down not reimbursed by the FDIC is recorded as net foreclosed real estate expense.

Estimated_Fair_Value_Of_Financ5

Estimated Fair Value Of Financial Instruments (Quantitative Information Regarding Level 3 Fair Value Measurements) (Detail) (Fair Value, Inputs, Level 3 [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Watch List Derivatives [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value of Assets (Liabilities), Recurring Measurements with Unobservable Inputs	741
Watch List Derivatives [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	4.30%
Watch List Derivatives [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	16.00%
Watch List Derivatives [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	15.40%
Watch List Derivatives [Member] | Loss Factors [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Input	LossB factors
Watch List Derivatives [Member] | Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique(s)	DiscountedB cashB flow
Risk Participation Agreements [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value of Assets (Liabilities), Recurring Measurements with Unobservable Inputs	-5	[1]
Risk Participation Agreements [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	0.60%
Risk Participation Agreements [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	16.00%
Risk Participation Agreements [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	4.70%
Risk Participation Agreements [Member] | Loss Factors [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Input	Loss factors
Risk Participation Agreements [Member] | Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique(s)	Discounted cash flow
Collateral-Dependent Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value of Assets (Liabilities), Recurring Measurements with Unobservable Inputs	34,192
Collateral-Dependent Impaired Loans [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	-1.20%
Collateral-Dependent Impaired Loans [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	-34.70%
Collateral-Dependent Impaired Loans [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	-21.90%	[2]
Collateral-Dependent Impaired Loans [Member] | Property Specific Adjustment [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Input	PropertyB specific adjustment
Collateral-Dependent Impaired Loans [Member] | Sales Comparison, Income Capitalization And/Or Cost Approach [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique(s)	Sales comparison, income capitalization and/or cost approach
OREO [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value of Assets (Liabilities), Recurring Measurements with Unobservable Inputs	8,657
OREO [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	-0.10%
OREO [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	-100.00%
OREO [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range Of Inputs Significant Unobservable Inputs	-19.10%	[2]
OREO [Member] | Property Specific Adjustment [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Input	Property specific adjustment
OREO [Member] | Sales Comparison, Income Capitalization And/Or Cost Approach [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique(s)	Sales comparison, income capitalization and/or cost approach
[1]	Represents fair value of underlying swap.
[2]	Weighted average is calculated based on assets with a property specific adjustment.

Estimated_Fair_Value_Of_Financ6

Estimated Fair Value Of Financial Instruments (Financial Instruments) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$132,211		$133,518
Federal funds sold and interest-bearing deposits in banks	292,341		306,544
Loans held-for-sale	115,161		26,816
Securities available-for-sale	1,645,344		1,602,476
Securities held-to-maturity, Carrying Amount	1,129,285		921,436
Securities held-to-maturity, fair value	1,132,615		896,908
Federal Home Loan Bank (FHLB) stock	28,666		30,005
Loans, net of allowance for loan losses and unearned fees	11,739,721		10,500,912
Covered assets, net of allowance for covered loan losses	28,941		96,235
Accrued interest receivable	40,531		37,004
Investment in BOLI	55,207		53,865
Derivative assets	43,062		48,422
Deposits	13,089,968	[1]	12,013,641	12,173,634
Deposits held-for-sale	122,216		0
Short-term and other borrowings	432,385		8,400
Long-term debt	344,788		627,793
Accrued interest payable	6,948		6,326
Derivative liabilities	26,767		48,890
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	132,211		133,518
Federal funds sold and interest-bearing deposits in banks			0
Loans held-for-sale			0
Securities available-for-sale	268,265		142,575
Securities held-to-maturity, fair value			0
Federal Home Loan Bank (FHLB) stock			0
Loans, net of allowance for loan losses and unearned fees, fair value			0
Covered assets, net of allowance for covered loan losses, fair value			0
Accrued interest receivable			0
Derivative assets			0
Deposits, fair value			0
Short-term and other borrowings, fair value			0
Long-term debt, fair value	204,320		267,360
Accrued interest payable			0
Derivative liabilities			0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks			0
Federal funds sold and interest-bearing deposits in banks	292,341		306,544
Loans held-for-sale	115,161		26,816
Securities available-for-sale	1,377,079		1,459,901
Securities held-to-maturity, fair value	1,132,615		896,908
Federal Home Loan Bank (FHLB) stock	28,666		30,005
Loans, net of allowance for loan losses and unearned fees, fair value			0
Covered assets, net of allowance for covered loan losses, fair value			0
Accrued interest receivable			0
Derivative assets	42,286		47,994
Deposits, fair value	10,595,040		9,443,094
Deposits held-for-sale, fair value	117,572
Short-term and other borrowings, fair value	427,150		2,060
Long-term debt, fair value	54,092		256,825
Accrued interest payable			0
Derivative liabilities	26,727		48,812
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks			0
Federal funds sold and interest-bearing deposits in banks			0
Loans held-for-sale			0
Securities available-for-sale			0
Securities held-to-maturity, fair value			0
Federal Home Loan Bank (FHLB) stock			0
Loans, net of allowance for loan losses and unearned fees, fair value	11,736,461		10,484,250
Covered assets, net of allowance for covered loan losses, fair value	33,988		113,593
Accrued interest receivable	40,531		37,004
Investment in BOLI	55,207		53,865
Derivative assets	776		428
Deposits, fair value	2,500,617		2,580,985
Short-term and other borrowings, fair value	3,794		6,453
Long-term debt, fair value	73,962		74,075
Accrued interest payable	6,948		6,326
Derivative liabilities	40		78
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	132,211		133,518
Federal funds sold and interest-bearing deposits in banks	292,341		306,544
Loans held-for-sale	115,161		26,816
Securities available-for-sale	1,645,344		1,602,476
Securities held-to-maturity, fair value	1,132,615		896,908
Federal Home Loan Bank (FHLB) stock	28,666		30,005
Loans, net of allowance for loan losses and unearned fees, fair value	11,736,461		10,484,250
Covered assets, net of allowance for covered loan losses, fair value	33,988		113,593
Accrued interest receivable	40,531		37,004
Investment in BOLI	55,207		53,865
Derivative assets	43,062		48,422
Deposits, fair value	13,095,657		12,024,079
Deposits held-for-sale, fair value	117,572
Short-term and other borrowings, fair value	430,944		8,513
Long-term debt, fair value	332,374		598,260
Accrued interest payable	6,948		6,326
Derivative liabilities	$26,767		$48,890
[1]	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.

Operating_Segments_Operating_S

Operating Segments (Operating Segments Performance) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating Segments Performance
Net interest income (loss)	$116,876	[1]	$116,758	[1]	$112,351	[1]	$108,752	[1]	$108,456	[1]	$105,835	[1]	$103,732	[1]	$103,040	[1]	$454,737		$421,063		$419,933
Provision for loan and covered loan losses	4,120	[1]	3,890	[1]	327	[1]	3,707	[1]	4,476	[1]	8,120	[1]	8,843	[1]	10,357	[1]	12,044		31,796		71,425
Non-interest income																	117,590		113,990		111,041
Non-interest expense	83,025	[1]	77,836	[1]	75,465	[1]	75,750	[1]	75,827	[1]	71,269	[1]	77,255	[1]	78,963	[1]	312,076		303,314		327,132
Income (loss) before income taxes	60,157	[1]	65,701	[1]	66,818	[1]	55,531	[1]	54,893	[1]	54,219	[1]	46,643	[1]	44,188	[1]	248,207		199,943		132,417
Income tax provision (benefit)	22,934	[1]	25,174	[1]	25,994	[1]	21,026	[1]	21,187	[1]	21,161	[1]	17,728	[1]	16,918	[1]	95,128		76,994		54,521
Net income (loss)																	153,079		122,949		77,896
Assets	15,603,382								14,085,746								15,603,382		14,085,746		14,057,515
Total loans	11,892,219								10,644,021								11,892,219		10,644,021		10,139,982
Deposits	13,089,968	[2]							12,013,641								13,089,968	[2]	12,013,641		12,173,634
Banking [Member]
Operating Segments Performance
Net interest income (loss)																	481,084		446,556		438,406
Provision for loan and covered loan losses																	12,044		31,796		71,425
Non-interest income																	100,259		95,344		93,943
Non-interest expense																	284,726		271,911		285,272
Income (loss) before income taxes																	284,573		238,193		175,652
Income tax provision (benefit)																	109,088		91,402		67,578
Net income (loss)																	175,485		146,791		108,074
Assets	13,882,805								12,465,063								13,882,805		12,465,063		12,552,897
Total loans	11,892,219								10,644,021								11,892,219		10,644,021		10,139,982
Deposits	13,150,600								12,069,583								13,150,600		12,069,583		12,251,614
Asset Management [Member]
Operating Segments Performance
Net interest income (loss)																	3,363		3,326		3,067
Provision for loan and covered loan losses																	0		0		0
Non-interest income																	17,271		18,387		17,018
Non-interest expense																	16,554		17,832		17,386
Income (loss) before income taxes																	4,080		3,881		2,699
Income tax provision (benefit)																	1,606		1,532		1,064
Net income (loss)																	2,474		2,349		1,635
Assets	0								0								0		0		0
Total loans	0								0								0		0		0
Deposits	0								0								0		0		0
Holding Company And Other Adjustments [Member]
Operating Segments Performance
Net interest income (loss)																	-29,710	[3]	-28,819	[3]	-21,540	[3]
Provision for loan and covered loan losses																	0	[3]	0	[3]	0	[3]
Non-interest income																	60	[3]	259	[3]	80	[3]
Non-interest expense																	10,796	[3]	13,571	[3]	24,474	[3]
Income (loss) before income taxes																	-40,446	[3]	-42,131	[3]	-45,934	[3]
Income tax provision (benefit)																	-15,566	[3]	-15,940	[3]	-14,121	[3]
Net income (loss)																	-24,880	[3]	-26,191	[3]	-31,813	[3]
Assets	1,720,577	[3]							1,620,683	[3]							1,720,577	[3]	1,620,683	[3]	1,504,618	[3]
Total loans	0	[3]							0	[3]							0	[3]	0	[3]	0	[3]
Deposits	($60,632)	[3]							($55,942)	[3]							($60,632)	[3]	($55,942)	[3]	($77,980)	[3]
[1]	All ratios are presented on an annualized basis.
[2]	Excludes deposits held-for-sale of $122.2 million as of December 31, 2014.
[3]	Deposit amounts represent the elimination of Holding Company cash accounts included in total deposits of the Banking segment.

Variable_Interest_Entities_Sch

Variable Interest Entities (Schedule of Non Consolidated Variable Interest Entities) (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Variable Interest Entity [Line Items]
Carrying Amount	$240,057	[1]	$296,163	[1]
Maximum Exposure to Loss	80,369	[1]	58,788	[1]
Trust Preferred Capital Securities Issuances [Member]
Variable Interest Entity [Line Items]
Carrying Amount	169,788		244,793
Maximum Exposure to Loss	0		0
Community Reinvestment Investments [Member]
Variable Interest Entity [Line Items]
Carrying Amount	14,360		7,889
Maximum Exposure to Loss	16,054		9,813
Commercial TDR Outstanding Loan Balance [Member]
Variable Interest Entity [Line Items]
Carrying Amount	49,376	[1]	43,481	[1]
Maximum Exposure to Loss	57,782	[1]	48,975	[1]
Commercial TDR Related Derivative Asset [Member]
Variable Interest Entity [Line Items]
Carrying Amount	6,533	[1]	0	[1]
Maximum Exposure to Loss	$6,533	[1]	$0	[1]
[1]	Excludes personal loans and loans to non-for-profit entities.

Variable_Interest_Entities_Nar

Variable Interest Entities (Narrative) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Percentage of common equity of trusts	100.00%
Investment Unfunded Commitments	$21,600,000
Other than Temporary Impairment Losses, Investments	0	0
Low Income Housing Tax Credit Investment Projects [Member]
Current Recorded Amount Of Investment	7,500,000
Investment Maturity Period	2031
Tax Credit Investments [Member]
Current Recorded Amount Of Investment	10,000,000	3,000,000
Investment Maturity Period	2029
Investment Unfunded Commitments	8,900,000
Other than Temporary Impairment Losses, Investments	$0

Condensed_Parent_Company_Finan2

Condensed Parent Company Financial Statements (Statements Of Financial Condition) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets
Other assets	$196,427	$157,328
Total assets	15,603,382	14,085,746	14,057,515
Liabilities and Equity
Long-term debt	344,788	627,793
Equity	1,481,679	1,301,904
Total liabilities and equity	15,603,382	14,085,746
Parent Company [Member]
Assets
Cash and interest-bearing deposits	60,632	55,942
Investment in and advances to subsidiaries	1,694,699	1,591,778
Other assets	25,879	28,904
Total assets	1,781,210	1,676,624
Liabilities and Equity
Long-term debt	294,788	369,793
Accrued expenses and other liabilities	4,743	4,927
Equity	1,481,679	1,301,904
Total liabilities and equity	$1,781,210	$1,676,624

Condensed_Parent_Company_Finan3

Condensed Parent Company Financial Statements (Statements Of Income) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income [Abstract]
Dividend income from subsidiaries																	$100,000
Interest income	135,978	[1]	134,300	[1]	128,951	[1]	125,158	[1]	125,620	[1]	123,577	[1]	121,632	[1]	121,409	[1]	524,387	492,238	487,036
Securities transactions and other income																	5,203	6,207	6,021
Expenses [Abstract]
Interest expense	19,102	[1]	17,542	[1]	16,600	[1]	16,406	[1]	17,164	[1]	17,742	[1]	17,900	[1]	18,369	[1]	69,650	71,175	67,103
Salaries and employee benefits																	182,192	166,929	174,948
Other expenses																	21,982	21,351	13,670
Loss (loss) before income taxes and equity in undistributed income of subsidiaries	60,157	[1]	65,701	[1]	66,818	[1]	55,531	[1]	54,893	[1]	54,219	[1]	46,643	[1]	44,188	[1]	248,207	199,943	132,417
Income tax benefit	-22,934	[1]	-25,174	[1]	-25,994	[1]	-21,026	[1]	-21,187	[1]	-21,161	[1]	-17,728	[1]	-16,918	[1]	-95,128	-76,994	-54,521
Net income																	153,079	122,949	77,896
Preferred stock dividend																	0	0	13,368
Net income (loss) available to common stockholders	37,223	[1]	40,527	[1]	40,824	[1]	34,505	[1]	33,706	[1]	33,058	[1]	28,915	[1]	27,270	[1]	153,079	122,949	64,528
Parent Company [Member]
Income [Abstract]
Dividend income from subsidiaries																	100,000
Interest income																	3	3	11
Securities transactions and other income																	60	259	80
Total income																	100,063	262	91
Expenses [Abstract]
Interest expense																	26,348	25,493	18,471
Salaries and employee benefits																	5,672	8,235	19,721
Other expenses																	5,123	5,336	4,754
Total expenses																	37,143	39,064	42,946
Loss (loss) before income taxes and equity in undistributed income of subsidiaries																	62,920	-38,802	-42,855
Income tax benefit																	14,242	14,627	12,908
Loss (loss) before undistributed income of subsidiaries																	77,162	-24,175	-29,947
Equity in undistributed income of subsidiaries																	75,917	147,124	107,843
Net income																	153,079	122,949	77,896
Preferred stock dividend																	0	0	13,368
Net income (loss) available to common stockholders																	$153,079	$122,949	$64,528
[1]	All ratios are presented on an annualized basis.

Condensed_Parent_Company_Finan4

Condensed Parent Company Financial Statements (Statements Of Cash Flows) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	$15,568	$12,676	$20,655
Depreciation of premises, furniture, and equipment	8,693	8,461	9,293
Excess tax benefit from exercise of stock options and vesting of restricted shares	-3,588	-723	-118
Net decrease (increase) in other assets	-27,830	-16,491	-17,161
Net increase (decrease) in other liabilities	16,662	5,422	-11,504
Net cash provided by operating activities	94,628	240,353	201,928
Financing Activities
Proceeds from the issuance of long-term debt	0	0	125,000
Payments for the redemption of preferred stock	0	0	-243,815
Payments for the redemption of common stock warrant	0	0	-1,225
Repayment of long-term debt	-75,005	-120,000
Stock repurchased in connection with benefit plans	-5,330	-2,522	-2,696
Cash dividends paid	-3,125	-3,119	-13,082
Proceeds from exercise of stock options and issuance of common stock under benefit plans	5,598	2,976	479
Excess tax benefit from exercise of stock options and vesting of restricted shares	3,588	723	118
Net cash (used in) provided by financing activities	1,340,254	-30,535	1,560,216
Net (decrease) increase in cash and cash equivalents	-15,510	-501,389	579,710
Cash and cash equivalents at beginning of year	440,062	941,451	361,741
Cash and cash equivalents at end of year	424,552	440,062	941,451
Parent Company [Member]
Operating Activities
Net income	153,079	122,949	77,896
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income from subsidiaries	-75,917	-147,124	-107,843
Share-based compensation expense	2,072	4,366	16,453
Depreciation of premises, furniture, and equipment	43	139	259
Excess tax benefit from exercise of stock options and vesting of restricted shares	-1,147	-425	-118
Net decrease (increase) in other assets	3,484	1,011	5,574
Net increase (decrease) in other liabilities	-209	-714	661
Net cash provided by operating activities	81,405	-19,798	-7,118
Financing Activities
Proceeds from the issuance of long-term debt	0	0	125,000
Payments for the redemption of preferred stock	0	0	-243,815
Payments for the redemption of common stock warrant	0	0	-1,225
Net proceeds from (payments for) the issuance of common stock	0	0	70,657
Repayment of long-term debt	-75,005
Stock repurchased in connection with benefit plans	-5,330	-2,522	-2,696
Cash dividends paid	-3,125	-3,119	-13,082
Proceeds from exercise of stock options and issuance of common stock under benefit plans	5,598	2,976	479
Excess tax benefit from exercise of stock options and vesting of restricted shares	1,147	425	118
Net cash (used in) provided by financing activities	-76,715	-2,240	-64,564
Net (decrease) increase in cash and cash equivalents	4,690	-22,038	-71,682
Cash and cash equivalents at beginning of year	55,942	77,980	149,662
Cash and cash equivalents at end of year	$60,632	$55,942	$77,980

Quarterly_Earnings_Performance2

Quarterly Earnings Performance (Quarterly Earnings Performance) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]
Interest income	$135,978	[1]	$134,300	[1]	$128,951	[1]	$125,158	[1]	$125,620	[1]	$123,577	[1]	$121,632	[1]	$121,409	[1]	$524,387	$492,238	$487,036
Interest expense	19,102	[1]	17,542	[1]	16,600	[1]	16,406	[1]	17,164	[1]	17,742	[1]	17,900	[1]	18,369	[1]	69,650	71,175	67,103
Net interest income	116,876	[1]	116,758	[1]	112,351	[1]	108,752	[1]	108,456	[1]	105,835	[1]	103,732	[1]	103,040	[1]	454,737	421,063	419,933
Provision for loan and covered loan losses	4,120	[1]	3,890	[1]	327	[1]	3,707	[1]	4,476	[1]	8,120	[1]	8,843	[1]	10,357	[1]	12,044	31,796	71,425
Fee revenue	30,426	[1]	30,666	[1]	30,063	[1]	25,905	[1]	26,461	[1]	27,655	[1]	28,873	[1]	29,827	[1]
Net securities gains (losses)	0	[1]	3	[1]	196	[1]	331	[1]	279	[1]	118	[1]	136	[1]	641	[1]	530	1,174	-205
Non-interest expense	83,025	[1]	77,836	[1]	75,465	[1]	75,750	[1]	75,827	[1]	71,269	[1]	77,255	[1]	78,963	[1]	312,076	303,314	327,132
Income (loss) before income taxes	60,157	[1]	65,701	[1]	66,818	[1]	55,531	[1]	54,893	[1]	54,219	[1]	46,643	[1]	44,188	[1]	248,207	199,943	132,417
Income tax provision (benefit)	22,934	[1]	25,174	[1]	25,994	[1]	21,026	[1]	21,187	[1]	21,161	[1]	17,728	[1]	16,918	[1]	95,128	76,994	54,521
Net income (loss) available to common stockholders	$37,223	[1]	$40,527	[1]	$40,824	[1]	$34,505	[1]	$33,706	[1]	$33,058	[1]	$28,915	[1]	$27,270	[1]	$153,079	$122,949	$64,528
Earnings Per Share, Basic	$0.48	[1]	$0.52	[1]	$0.52	[1]	$0.44	[1]	$0.43	[1]	$0.42	[1]	$0.37	[1]	$0.35	[1]	$1.96	$1.58	$0.88
Diluted earnings per common share	$0.47	[1]	$0.51	[1]	$0.52	[1]	$0.44	[1]	$0.43	[1]	$0.42	[1]	$0.37	[1]	$0.35	[1]	$1.94	$1.57	$0.88
Return on average common equity	10.03%	[1]	11.27%	[1]	11.88%	[1]	10.48%	[1]	10.28%	[1]	10.43%	[1]	9.28%	[1]	9.01%	[1]
Return on average assets	0.95%	[1]	1.09%	[1]	1.14%	[1]	1.00%	[1]	0.96%	[1]	0.96%	[1]	0.86%	[1]	0.81%	[1]
Net interest margin - tax-equivalent	3.07%	[1]	3.23%	[1]	3.21%	[1]	3.23%	[1]	3.18%	[1]	3.18%	[1]	3.22%	[1]	3.19%	[1]
[1]	All ratios are presented on an annualized basis.

Recovered_Sheet16

SUBSEQUENT EVENTS Subsequent Events (Details) (USD $)	1 Months Ended
	Jan. 20, 2015	Dec. 31, 2014		Dec. 31, 2013
Subsequent Event [Line Items]
Deposits held-for-sale		$122,216,000		$0
Other loans held-for-sale		72,946,000	[1]	9,197,000	[1]
Branch Closing, Sale [Member]
Subsequent Event [Line Items]
Deposits held-for-sale	106,900,000
Other loans held-for-sale	36,700,000
Gain on Sale of Norcross Branch	4,300,000
Gain to be recognized in March 31, 2015 financial statements [Member]
Subsequent Event [Line Items]
Gain on Sale of Norcross Branch	4,000,000
Branch Closing, Sale [Member]
Subsequent Event [Line Items]
Deposits held-for-sale		122,200,000
Other loans held-for-sale		$36,300,000
[1]	Amounts at DecemberB 31, 2014 consists of $36.6 million of commercial, commercial real estate and construction loans carried at the lower of aggregate cost or fair value and $36.3 million of commercial, commercial real estate, construction, home equity and personal loans held-for-sale in connection with the pending sale of the Company's banking office located in Norcross, Georgia, which closed in January 2015. Amounts at DecemberB 31, 2013 represent commercial loans carried at the lower of aggregate cost or fair value. Generally, the Company intends to sell these loans within 30-60 days from the date the intent to sell was established.