Western Alliance Bancorporation (WAL) 10-Q 30 Apr 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 25, 2014
Entity Information [Line Items]	'	'
Entity Registrant Name	'WESTERN ALLIANCE BANCORPORATION	'
Entity Central Index Key	'0001212545	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Amendment Flag	'false	'
Trading Symbol	'WAL	'
Entity Common Stock, Shares Outstanding	'	87,588,436

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'	'
Cash and due from banks	$161,302	$134,906	'
Securities purchased under agreement to resell	111,085	0	'
Interest-bearing deposits in other financial institutions	193,538	170,608	'
Cash and cash equivalents	465,925	305,514	'
Money market investments	851	2,632	'
Investment securities—measured at fair value	2,943	3,036	'
Investment securities—AFS, at fair value; amortized cost of $1,384,219 at March 31, 2014 and $1,404,048 at December 31, 2013	1,366,433	1,370,696	'
Investment securities—HTM, at amortized cost; fair value of $281,483 at March 31, 2014 and $281,704 at December 31, 2013	275,738	283,006	'
Investments in restricted stock, at cost	25,275	30,186	'
Loans, net of deferred loan fees and costs	7,108,599	6,801,415	'
Less: allowance for credit losses	-103,899	-100,050	'
Total loans	7,004,700	6,701,365	'
Premises and equipment, net	106,579	105,565	'
Other assets acquired through foreclosure, net	56,450	66,719	77,921
Bank owned life insurance	141,511	140,562	'
Goodwill	23,224	23,224	'
Other intangible assets, net	3,553	4,150	'
Deferred tax assets, net	78,322	80,688	'
Prepaid expenses	4,660	4,778	'
Other assets	190,460	185,221	'
Total assets	9,746,624	9,307,342	'
Deposits:	'	'	'
Non-interest-bearing demand	2,093,604	2,199,983	'
Interest-bearing	6,055,369	5,638,222	'
Total deposits	8,148,973	7,838,205	'
Customer repurchase agreements	57,407	71,192	'
Securities sold short	109,793	0	'
Other borrowings	342,816	341,096	'
Junior subordinated debt, at fair value	42,836	41,858	'
Other liabilities	149,994	159,493	'
Total liabilities	8,851,819	8,451,844	'
Commitments and contingencies (Note 6)	'	'	'
Stockholders’ equity:	'	'	'
Preferred stock - par value $0.0001 and liquidation value per share of $1,000; 20,000,000 authorized; 141,000 shares issued and outstanding at March 31, 2014 and December 31, 2013	141,000	141,000	'
Common stock - par value $0.0001; 200,000,000 authorized; 87,553,976 shares issued and outstanding at March 31, 2014 and 87,186,403 at December 31, 2013	9	9	'
Additional paid in capital	795,306	797,146	'
Accumulated deficit	-30,379	-61,111	'
Accumulated other comprehensive loss	-11,131	-21,546	7,205
Total stockholders’ equity	894,805	855,498	781,021
Total liabilities and stockholders’ equity	$9,746,624	$9,307,342	'

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Amortized cost of investment securities available for sale	$1,384,219	$1,404,048
Amortized cost of investment securities held to maturity	$281,483	$281,704
Preferred stock, par value	$0.00	$0.00
Preferred stock, liquidation value	$1,000	$1,000
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	141,000	141,000
Preferred stock, shares outstanding	141,000	141,000
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	87,553,976	87,186,403
Common stock, shares outstanding	87,553,976	87,186,403

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest income:	'	'
Loans, including fees	$86,804	$74,725
Investment securities	10,226	6,961
Dividends	1,099	1,197
Other	572	225
Total interest income	98,701	83,108
Interest expense:	'	'
Deposits	4,665	3,732
Other borrowings	2,819	2,672
Junior subordinated debt	421	466
Customer repurchase agreements	19	35
Total interest expense	7,924	6,905
Net interest income	90,777	76,203
Provision for credit losses	3,500	5,439
Net interest income after provision for credit losses	87,277	70,764
Non-interest income:	'	'
Service charges and fees	2,530	2,534
Income from bank owned life insurance	949	1,036
Gain on sales of investment securities, net	366	147
Unrealized losses on assets / liabilities measured at fair value, net	-1,276	-471
Other fee revenue	1,108	957
Other income	1,158	596
Total non-interest income	4,835	4,799
Non-interest expense:	'	'
Salaries and employee benefits	29,555	26,574
Occupancy	4,682	4,846
Legal, professional and directors’ fees	3,639	3,023
Data processing	2,674	1,865
Insurance	2,393	2,370
Loan and repossessed asset expenses	1,234	1,596
Customer service	620	643
Marketing	559	667
Net (gain) loss on sales / valuations of repossessed and other assets	-2,547	519
Intangible amortization	597	597
Merger / restructure expenses	157	195
Other expense	6,186	4,034
Total non-interest expense	49,749	46,929
Income from continuing operations before provision for income taxes	42,363	28,634
Income tax expense	10,624	7,787
Income from continuing operations	31,739	20,847
(Loss) gain from discontinued operations, net of tax	-654	38
Net income	31,085	20,885
Dividends on preferred stock	353	353
Net income available to common shareholders	$30,732	$20,532
Earnings per share from continuing operations:	'	'
Basic	$0.36	$0.24
Diluted	$0.36	$0.24
Loss per share from discontinued operations:	'	'
Basic	($0.01)	$0
Diluted	($0.01)	$0
Earnings per share applicable to common shareholders:	'	'
Basic	$0.35	$0.24
Diluted	$0.35	$0.24
Weighted average number of common shares outstanding:	'	'
Basic	86,256	85,324
Diluted	87,123	85,980
Dividends declared per common share	$0	$0

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net income	$31,085	$20,885
Other comprehensive income (loss), net:	'	'
Unrealized gain (loss) on AFS securities, net of tax effect of $(6,365) and $459, respectively	10,644	-890
Unrealized loss on cash flow hedge, net of tax effect of $0 and $18, respectively	0	-34
Realized gain on sale of AFS securities included in income, net of tax effect of $137 and $50, respectively	-229	-97
Net other comprehensive income (loss)	10,415	-1,021
Comprehensive income	$41,500	$19,864

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Unrealized gain on securities available-for-sale securities, tax	($6,365)	$459
Unrealized gain on cash flow hedge, tax	0	18
Realized gain on sale of securities, tax	$137	$50

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)		Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated (Deficit) [Member]
In Thousands
Beginning balance at Dec. 31, 2012	[1]	$759,421	$141,000	$9	$784,852	$8,226	($174,666)
Beginning balance, shares at Dec. 31, 2012	[1]	'	141	86,465	'	'	'
Net income		20,885	'	'	'	'	20,885
Exercise of stock options		1,118	'	'	1,118	'	'
Exercise of stock options, shares		'	'	156	'	'	'
Stock-based compensation		803	'	'	803	'	'
Stock-based compensation, shares		'	'	59	'	'	'
Restricted stock grants, net		168	'	'	168	'	'
Other		0	0	0	'	0	0
Restricted stock grants, net, shares		'	'	399	'	'	'
Dividends on preferred stock		-353	'	'	'	'	-353
Other comprehensive (loss) income, net		-1,021	'	'	'	-1,021	'
Ending balance at Mar. 31, 2013		781,021	141,000	9	786,941	7,205	-154,134
Ending balance, shares at Mar. 31, 2013		'	141	87,079	'	'	'
Beginning balance at Dec. 31, 2013		855,498	141,000	9	797,146	-21,546	-61,111
Beginning balance, shares at Dec. 31, 2013		'	141	87,186	'	'	'
Net income		31,085	'	'	'	'	31,085
Exercise of stock options		703	'	'	703	'	'
Exercise of stock options, shares		'	'	64	'	'	'
Stock-based compensation		854	'	'	854	'	'
Stock-based compensation, shares		'	'	37	'	'	'
Restricted stock grants, net		-3,397	'	'	-3,397	'	'
Restricted stock grants, net, shares		'	'	267	'	'	'
Dividends on preferred stock		-353	'	'	'	'	-353
Other comprehensive (loss) income, net		10,415	'	'	'	10,415	'
Ending balance at Mar. 31, 2014		$894,805	$141,000	$9	$795,306	($11,131)	($30,379)
Ending balance, shares at Mar. 31, 2014		'	141	87,554	'	'	'
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CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:	'	'
Net income	$31,085	$20,885
Adjustments to reconcile net income to cash provided by operating activities:	'	'
Provision for credit losses	3,500	5,439
Depreciation and amortization	2,044	2,153
Stock-based compensation	332	971
Deferred income taxes and income taxes receivable	-1,696	-1,754
Net amortization of discounts and premiums for investment securities	2,050	2,577
Accretion and amortization of fair market value adjustments due to acquisitions	-3,305	-3,288
Income from bank owned life insurance	-949	-1,036
(Gains) / losses on:	'	'
Sales of securities, AFS	-366	-147
Other assets acquired through foreclosure, net	-1,168	-455
Valuation adjustments of other repossessed assets, net	35	1,017
Sale of premises and equipment and other assets, net	-1,411	-43
Changes in:	'	'
Other assets	3,191	18,475
Other liabilities	5,359	828
Fair value of assets and liabilities measured at fair value	1,276	471
Net cash provided by operating activities	39,977	46,093
Investment securities - measured at fair value	'	'
Principal pay downs and maturities	112	279
Investment securities - AFS	'	'
Purchases	-24,082	-124,909
Principal pay downs and maturities	38,332	51,196
Proceeds from sales	4,196	4,072
Investment securities - HTM	'	'
Principal pay downs and maturities	6,600	0
Purchase of investment tax credits	-10,529	-5,084
Sale / (purchase) of money market investments, net	1,781	-132
Liquidation of restricted stock	4,911	1,169
Loan fundings and principal collections, net	-322,640	-124,390
Sale and purchase of premises and equipment, net	-1,103	-761
Proceeds from sale of other real estate owned and repossessed assets, net	13,512	5,343
Net cash used in investing activities	-288,910	-193,217
Cash flows from financing activities:	'	'
Net increase in deposits	310,939	279,737
Net increase in borrowings	98,055	218,272
Proceeds from exercise of common stock options	703	1,118
Cash dividends paid on preferred stock	-353	-353
Net cash provided by financing activities	409,344	498,774
Net increase in cash and cash equivalents	160,411	351,650
Cash and cash equivalents at beginning of year	305,514	204,625
Cash and cash equivalents at end of period	465,925	556,275
Cash paid during the period for:	'	'
Interest	5,916	7,132
Income taxes	2,501	1,450
Non-cash investing and financing activity:	'	'
Transfers to other assets acquired through foreclosure, net	2,110	6,609
Unfunded commitments to purchase investment tax credits	12,298	46,582
Change in unrealized gain (loss) on AFS securities, net of tax	10,415	-1,021
Change in unrealized loss on cash flow hedge, net of tax	0	-34
Change in unfunded obligations	$16,625	$35,451

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of operation
	WAL, incorporated under the laws of the state of Nevada, is a bank holding company providing full service banking and related services to locally owned businesses, professional firms, real estate developers and investors, local non-profit organizations, high net worth individuals and other consumers through its wholly-owned subsidiary bank: WAB, doing business as ABA in Arizona, as FIB in Northern Nevada, as AAB throughout the U.S., as BON in Southern Nevada, and as TPB in California. In addition, the Company has two non-bank subsidiaries, WAEF, which offers equipment finance services nationwide, and LVSP, which holds and manages certain non-performing loans and OREO.
	Basis of presentation
	The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the unaudited Consolidated Financial Statements.
	Use of estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions; and determination of the valuation allowance related to deferred tax assets. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the unaudited Consolidated Financial Statements during their preparation.
	Principles of consolidation
	On December 31, 2013, the Company consolidated its three bank subsidiaries under one bank charter, WAB. As the subsidiary bank mergers did not meet the definition of a business combination under the guidance of FASB ASC 805, Business Combinations, the entities were combined in a method similar to a pooling of interests.
	WAL has nine wholly-owned subsidiaries: WAB, WAEF, LVSP and six unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities.
	WAB has the following wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal loans and leases; BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and BW Nevada Holdings, LLC, which owns the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building.
	The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.
	Reclassifications
	Certain amounts in the consolidated financial statements as of December 31, 2013 and for the three months ended March 31, 2013 have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.
	Interim financial information
	The accompanying unaudited Consolidated Financial Statements as of and for the three months ended March 31, 2014 and 2013 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2013.
	The information furnished in these interim statements reflects all adjustments which are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year. The interim financial information should be read in conjunction with the Company's audited Consolidated Financial Statements.
	Investment securities
	Investment securities may be classified as HTM, AFS or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.
	Securities classified as AFS or trading are reported as an asset on the Consolidated Balance Sheets at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.
	Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security using the interest method. For mortgage-backed securities, estimates of prepayments are considered in the constant yield calculations.
	In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and it is not more likely than not the Company would be required to sell the security.
	Declines in the fair value of individual debt securities AFS that are deemed to be other than temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other than temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) market or other factors is recognized in other comprehensive income or loss. Credit loss is recorded if the present value of cash flows is less than amortized cost.
	For individual debt securities where the Company intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the securities cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.
	Loans, interest and fees from loans
	The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by unearned loan fees and allowance for credit losses. Purchased loans are recorded at estimated fair value on the date of purchase.
	The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected due, at least in part, to credit quality. Loans are evaluated individually to determine if there is credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not “carry over” or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For additional information, see "Note 3. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.
	Interest income on loans is accrued daily using the effective interest method and recognized over the terms of the loans. Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period.
	When loans are repaid, any remaining unamortized balances of unearned fees, deferred fees and costs and premiums and discounts paid on purchased loans are accounted for though interest income.
	Nonaccrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. Generally, the Company places loans in a nonaccrual status and ceases recognizing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest is unlikely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if they are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.
	For all loan types, when a loan is placed on nonaccrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed. Subsequent payments received from the customer are applied to principal and no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. The Company occasionally recognizes income on a cash basis for non-accrual loans in which the collection of the remaining principal balance is not in doubt.
	Impaired loans: A loan is identified as impaired when it is probable that interest and principal will not be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as nonaccrual. However, in certain instances, impaired loans may continue on an accrual basis, such as loans classified as impaired due to doubt regarding collectability according to contractual terms, that are both fully secured by collateral and are current in their interest and principal payments. Impaired loans are measured for reserve requirements in accordance with FASB ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are charged against the allowance for credit losses. In addition to our own internal loan review process, the FDIC may from time to time direct the Company to modify loan grades, loan impairment calculations or loan impairment methodology.
	Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, extensions, deferrals, renewals and rewrites. A TDR loan is also considered impaired. Generally, a loan that is modified at an effective market rate of interest may no longer be disclosed as a TDR in years subsequent to the restructuring if it is performing based on the terms specified by the restructuring agreement.
	Allowance for credit losses
	Credit risk is inherent in the business of extending loans and leases to borrowers. Like other financial institutions, the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses charged to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.
	The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include our historical loss experience, delinquency and charge-off trends, collateral values, changes in the level of nonperforming loans and other factors. Qualitative factors include the economic condition of our operating markets and the state of certain industries. Specific changes in the risk factors are based on actual loss experience, as well as perceived risk of similar groups of loans classified by collateral type, purpose and term. An internal five-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona and California, which, in some cases, have declined substantially from their peak. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, the FDIC and state bank regulatory agency, as an integral part of their examination processes, periodically review the bank's allowances for credit losses, and may require us to make additions to our allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.
	The allowance consists of specific and general components. The specific allowance relates to impaired loans. In general, impaired loans include those where interest recognition has been suspended, loans that are more than 90 days delinquent but because of adequate collateral coverage, income continues to be recognized, and other criticized and classified loans not paying substantially according to the original contract terms. For such loans, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan are lower than the carrying value of that loan, pursuant to FASB ASC 310, Receivables. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The amount to which the present value falls short of the current loan obligation will be set up as a reserve for that account or charged-off.
	The Company uses an appraised value method to determine the need for a reserve on impaired, collateral dependent loans and further discounts the appraisal for disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months.
	The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.
	Off-balance sheet instruments
	In the ordinary course of business, the Company has entered into off-balance sheet financial instruments consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the consolidated financial statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the consolidated balance sheets. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.
	As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included within other liabilities and the charge to income that establishes this liability is included in non-interest expense.
	Other assets acquired through foreclosure
	Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value, less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.
	Business combinations
	Business combinations are accounted for under the acquisition method of accounting in accordance with FASB ASC 805, Business Combinations. Under the acquisition method the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of earnings from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.
	Derivative financial instruments
	The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).
	The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheets at their fair value in accordance with FASB ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.
	For a fair value hedge, the change in the fair value of the derivative instrument is recognized in non-interest income in the Consolidated Income Statement. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.
	The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value on the Consolidated Balance Sheets, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.
	Derivative instruments that are not designated as hedges per the accounting guidance are reported in the Consolidated Balance Sheets at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.
	The Company occasionally purchases a financial instrument or originates a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that 1) the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract, and 2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where 1) the host contract is measured at fair value, with changes in fair value reported in current earnings, or 2) the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried on the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.
	Income taxes
	The Company and its subsidiaries, other than BW Real Estate, Inc., file a consolidated federal tax return. Due to tax regulations, several items of income and expense are recognized in different periods for tax return purposes than for financial reporting purposes. These items represent temporary differences. Deferred taxes are provided on an asset and liability method, whereby deferred tax assets are recognized for deductible temporary differences and tax credit carryovers and deferred tax liabilities are recognized for taxable temporary differences. A temporary difference is the difference between the reported amount of an asset or liability and its tax basis. A deferred tax asset is reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effect of changes in tax laws and rates on the date of enactment.
	Fair values of financial instruments
	The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820 establishes a framework for measuring fair value, establishes a three-level valuation hierarchy for disclosure of fair value measurement and enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income and/or cost approaches. FASB ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:
	•	Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.
	•	Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.
	•	Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models and similar techniques.
	The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.
	Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability, rather than an entity-specific measure. When market assumptions are available, FASB ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.
	FASB ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.
Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at March 31, 2014 and December 31, 2013. The estimated fair value amounts for March 31, 2014 and December 31, 2013 have been measured as of period-end, and have not been reevaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at the period-end.
The information in "Note 11. Fair Value Accounting" in these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.
Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.
The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:
Cash and cash equivalents
The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.
Money market and certificates of deposit investments
The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.
Investment securities
The fair values of U.S. Treasuries, corporate debt securities, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.
The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.
The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company has estimated the future cash flows and discount rate using third party quotes adjusted based on assumptions regarding the adjustments a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.
Restricted stock
WAB is a member of the FHLB system and maintains an investment in capital stock of the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its FHLB stock to determine if any impairment exists. The fair values have been categorized as Level 2 in the fair value hierarchy.
Loans
Fair value for loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality with adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans disclosed in "Note 11. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements is categorized as Level 2 in the fair value hierarchy, excluding impaired loans that are categorized as Level 3.
Accrued interest receivable and payable
The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value. Accrued interest receivable and payable fair value measurements are classified as Level 3 in the fair value hierarchy.
Derivative financial instruments
All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.
Deposits
The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities disclosed in "Note 11. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements is categorized as Level 2 in the fair value hierarchy.
Federal Home Loan Bank advances and other borrowings
The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. The other borrowings have been categorized as Level 3 in the fair value hierarchy.
Junior subordinated debt
Junior subordinated debt and subordinated debt are valued by comparing interest rates and spreads to an index relative to the ten year treasury rate and discounting the contractual cash flows on the Company's debt using these market rates. The junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.
Off-balance sheet instruments
Fair values for the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) are based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing.
Recent accounting pronouncements
In February 2013, the FASB issued guidance within ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date. The amendments in ASU 2013-04 to Topic 405, Liabilities, provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of the Update is fixed at the reporting date, except for obligations addressed with existing GAAP. The guidance requires an entity to measure those obligations as the sum of the amount the reporting entity agreed to pay on behalf of its co-obligors. The guidance also requires an entity to disclose the nature and amount of the obligation, as well as other information about those obligations. The amendment is effective retrospectively for reporting periods beginning after December 15, 2013. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
In July 2013, the FASB issued guidance within ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The amendments in ASU 2013-11 to Topic 740, Income Taxes, provide guidance on the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
In January 2014, the FASB issued guidance within ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The amendments in ASU 2014-01 to Topic 323, Equity Investments and Joint Ventures, provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The amendments permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014 and should be applied retrospectively to all periods presented, with early adoption permitted. All of the Company's LIHTC investments are within the scope of this guidance and the Company has adopted this amended guidance beginning on January 1, 2014. As a result, prior period financial information has been adjusted to conform to the amended guidance. See "Note 10. Income Taxes" for the impact that adoption had on the Company's financial condition and results of operations as well as additional disclosures required under these amendments. The adoption of this amended guidance did not have a significant impact on the Company's cash flows.
In January 2014, the FASB issued guidance within ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of the amendments in ASU 2014-04 to Topic 310, Receivables - Troubled Debt Restructurings by Creditors, is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor 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 amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014. An entity can elect to adopt the amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investment Securities	'
	INVESTMENT SECURITIES
	Carrying amounts and fair values of investment securities at March 31, 2014 and December 31, 2013 are summarized as follows:
			31-Mar-14
	Held-to-maturity		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	Collateralized debt obligations		$	50	$	4,869		$	—		$	4,919
	Corporate debt securities		97,776		821			(3,156		)	95,441
	Municipal obligations		177,912		4,490			(1,279		)	181,123
	Total HTM securities		$	275,738	$	10,180		$	(4,435	)	$	281,483
	Available-for-sale		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	U.S. Government-sponsored agency securities		$	59,112	$	—		$	(1,440	)	$	57,672
	Municipal obligations		121,242		1,048			(3,412		)	118,878
	Preferred stock		75,902		1,313			(3,268		)	73,947
	Mutual funds		37,422		256			(435		)	37,243
	Residential MBS issued by GSEs		989,705		5,799			(8,097		)	987,407
	Commercial MBS issued by GSEs		2,088		—			(54		)	2,034
	Private label residential MBS		37,611		30			(2,026		)	35,615
	Private label commercial MBS		5,225		187			—			5,412
	Trust preferred securities		32,000		—			(7,272		)	24,728
	CRA investments		23,912		—			(415		)	23,497
	Total AFS securities		$	1,384,219	$	8,633		$	(26,419	)	$	1,366,433
	Securities measured at fair value
	Residential MBS issued by GSEs										$	2,460
	Private label residential MBS										483
	Total securities measured at fair value										$	2,943
			31-Dec-13
	Held-to-maturity		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	Collateralized debt obligations		$	50	$	1,346		$	—		$	1,396
	Corporate debt securities		97,777		775			(3,826		)	94,726
	Municipal obligations		183,579		2,773			(2,370		)	183,982
	CRA investments		1,600		—			—			1,600
	Total HTM securities		$	283,006	$	4,894		$	(6,196	)	$	281,704
	Available-for-sale		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	U.S. Government-sponsored agency securities		$	49,110	$	—		$	(2,135	)	$	46,975
	Municipal obligations		121,671		316			(6,322		)	115,665
	Preferred stock		68,110		853			(7,479		)	61,484
	Mutual funds		37,423		93			(984		)	36,532
	Residential MBS issued by GSEs		1,028,402		5,567			(12,548		)	1,021,421
	Private label residential MBS		38,250		—			(2,151		)	36,099
	Private label commercial MBS		5,252		181			—			5,433
	Trust preferred securities		32,000		—			(8,195		)	23,805
	CRA investments		23,830		—			(548		)	23,282
	Total AFS securities		$	1,404,048	$	7,010		$	(40,362	)	$	1,370,696
	Securities measured at fair value
	Residential MBS issued by GSEs										$	3,036
	For additional information on the fair value changes of the securities measured at fair value, see the trading securities table in "Note 11. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements.
	The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI for both debt and equity securities is a decline in the market value below the amount recorded for an investment, taking into account the severity and duration of the decline. Another potential indication of OTTI is a downgrade below investment grade. In determining whether an impairment is OTTI, the Company considers the length of time and the extent to which the market value has been below cost, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions of its industry, and the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery. For marketable equity securities, the Company also considers the issuer’s financial condition, capital strength and near-term prospects.
	For debt securities and for ARPS that are treated as debt securities for the purpose of OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates and industry and issuer specific factors), the issuer’s financial condition, near-term prospects and current ability to make future payments in a timely manner, the issuer’s ability to service debt, and any change in agencies’ ratings at evaluation date from acquisition date and any likely imminent action. For ARPS with a fair value below cost that is not attributable to the credit deterioration of the issuer, such as a decline in cash flows from the security or a downgrade in the security’s rating below investment grade, the Company does not recognize an OTTI charge where it is able to assert that it has the intent and ability to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value.
	The Company has reviewed securities on which there is an unrealized loss in accordance with its accounting policy for OTTI described above and determined that there were no impairment charges for the three months ended March 31, 2014 and 2013.
	The Company does not consider any securities to be other-than-temporarily impaired as of March 31, 2014 and December 31, 2013. No assurance can be made that additional OTTI will not occur in future periods.
	Information pertaining to securities with gross unrealized losses at March 31, 2014 and December 31, 2013, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows:
			31-Mar-14
			Less Than Twelve Months					More Than Twelve Months					Total
			Gross		Fair			Gross			Fair		Gross		Fair
			Unrealized		Value			Unrealized			Value		Unrealized		Value
			Losses					Losses					Losses
		(in thousands)
Held-to-maturity
Corporate debt securities		$	—	$	—		$	3,156		$	71,844	$	3,156	$	71,844
Municipal obligations		480		17,233			799			8,486		1,279		25,719
Total HTM securities		$	480	$	17,233		$	3,955		$	80,330	$	4,435	$	97,563
Available-for-sale
U.S. government sponsored agency securities		$	298	$	40,117		$	1,142		$	17,555	$	1,440	$	57,672
Preferred stock		3,268		36,712			—			—		3,268		36,712
Mutual funds		435		25,648			—			—		435		25,648
Residential MBS issued by GSEs		7,247		489,288			850			13,788		8,097		503,076
Commercial MBS issued by GSEs		54		2,034			—			—		54		2,034
Municipal obligations		1,290		46,367			2,122			20,761		3,412		67,128
Private label residential MBS		1,986		29,349			40			3,393		2,026		32,742
Trust preferred securities		—		—			7,272			24,728		7,272		24,728
CRA investments		415		23,442			—			—		415		23,442
Total AFS securities		$	14,993	$	692,957		$	11,426		$	80,225	$	26,419	$	773,182
		31-Dec-13
		Less Than Twelve Months					Over Twelve Months					Total
		Gross		Fair			Gross			Fair		Gross		Fair
		Unrealized		Value			Unrealized			Value		Unrealized		Value
		Losses					Losses					Losses
		(in thousands)
Held-to-maturity
Corporate debt securities		$	163	$	9,837		$	3,663		$	71,337	$	3,826	$	81,174
Municipal obligations		1,624		50,740			746			5,102		2,370		55,842
Total HTM securities		$	1,787	$	60,577		$	4,409		$	76,439	$	6,196	$	137,016
Available-for-sale
U.S. government sponsored agency securities		$	2,135	$	46,976		$	—		$	—	$	2,135	$	46,976
Preferred stock		7,479		44,637			—			—		7,479		44,637
Mutual funds		984		30,101			—			—		984		30,101
Residential MBS issued by GSEs		11,934		601,756			614			8,984		12,548		610,740
Municipal obligations		3,545		72,300			2,777			17,923		6,322		90,223
Private label residential MBS		2,009		32,517			142			3,583		2,151		36,100
Trust preferred securities		—		—			8,195			23,807		8,195		23,807
Other		548		23,823			—			—		548		23,823
Total AFS securities		$	28,634	$	852,110		$	11,728		$	54,297	$	40,362	$	906,407
At March 31, 2014 and December 31, 2013, the Company’s unrealized losses relate primarily to interest rate fluctuations, credit spread widening and reduced liquidity in applicable markets. The total number of securities in an unrealized loss position at March 31, 2014 was 192, compared to 252 at December 31, 2013. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred and industry analysis reports. Since material downgrades have not occurred and management does not intend to sell the debt securities in the foreseeable future, none of the securities described in the above table or in this paragraph were deemed to be other than temporarily impaired.
At March 31, 2014, the net unrealized loss on trust preferred securities classified as AFS was $7.3 million, compared with $8.2 million at December 31, 2013. The Company actively monitors its debt and other structured securities portfolios classified as AFS for declines in fair value. At March 31, 2014, the gross unrealized loss on corporate bond portfolio classified as HTM was $3.2 million, compared to $3.8 million at December 31, 2013. The FRB continues to express its intention to keep interest rates at historically low levels into 2015. The yields of most of the bonds in the portfolio are tied to LIBOR, thus negatively affecting their anticipated returns.
The amortized cost and fair value of securities as of March 31, 2014, by contractual maturities, are shown below. The actual maturities of the MBS may differ from their contractual maturities because the loans underlying the securities may be repaid without any penalties due to borrowers that have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, these securities are listed separately in the maturity summary.
		31-Mar-14
		Amortized		Estimated
		Cost		Fair Value
		(in thousands)
Held-to-Maturity
Due in one year or less		$	3,608	$	3,673
After one year through five years		17,596		18,191
After five years through ten years		146,688		145,735
After ten years		107,846		113,884
Total HTM		$	275,738	$	281,483
Available-for-Sale
Due in one year or less		$	66,543	$	65,949
After one year through five years		16,920		17,513
After five years through ten years		64,404		63,021
After ten years		201,723		189,482
Mortgage backed securities		1,034,629		1,030,468
Total AFS		$	1,384,219	$	1,366,433
The following tables summarize the carrying amounts of the Company’s investment ratings position as March 31, 2014 and December 31, 2013:
		As of March 31, 2014
		AAA		Split-rated			AA+			A+ to A-		BBB+		BB+		Totals
				AAA/AA+			to AA-					to BBB-		and below
		(in thousands)
Municipal obligations		$	7,928	$	—		$	131,355		$	150,004	$	7,288	$	215	$	296,790
Residential MBS issued by GSEs		—		989,867			—			—		—		—		989,867
Commercial MBS issued by GSEs		—		2,034			—			—		—		—		2,034
Private label residential MBS		23,343		—			107			4,143		5,028		3,477		36,098
Private label commercial MBS		5,412		—			—			—		—		—		5,412
Mutual funds (3)		—		—			—			—		37,243		—		37,243
U.S. government sponsored agency		—		57,672			—			—		—		—		57,672
Preferred stock		—		—			—			—		46,452		19,385		65,837
Trust preferred securities		—		—			—			—		24,728		—		24,728
Collateralized debt obligations		—		—			—			—		—		50		50
Corporate debt securities		—		—			2,698			25,098		69,980		—		97,776
Total (1) (2)		$	36,683	$	1,049,573		$	134,160		$	179,245	$	190,719	$	23,127	$	1,613,507
-1	The Company used the average credit rating of the combination of S&P, Moody’s and Fitch in the above table where ratings differed.
-2	Securities values are shown at carrying value as of March 31, 2014. Unrated securities consist of CRA investments with a carrying value of $23.5 million and preferred stock with a carrying value of $8.1 million.
-3	At least 80% of mutual funds are investment grade corporate debt securities.
		31-Dec-13
		AAA		Split-rated			AA+			A+ to A-		BBB+		BB+		Totals
				AAA/AA+			to AA-					to BBB-		and below
		(in thousands)
Municipal obligations		$	7,965	$	—		$	129,810		$	153,949	$	7,305	$	215	$	299,244
Residential MBS issued by GSEs		—		1,024,457			—			—		—		—		1,024,457
Private label residential MBS		23,646		—			125			4,101		4,625		3,602		36,099
Private label commercial MBS		5,433		—			—			—		—		—		5,433
Mutual funds (3)		—		—			—			—		36,532		—		36,532
U.S. government sponsored agency		—		46,975			—			—		—		—		46,975
Preferred stock		—		—			—			—		45,847		13,244		59,091
Trust preferred securities		—		—			—			—		23,805		—		23,805
Collateralized debt obligations		—		—			—			—		—		50		50
Corporate debt securities		—		—			2,697			35,102		59,978		—		97,777
Total (1) (2)		$	37,044	$	1,071,432		$	132,632		$	193,152	$	178,092	$	17,111	$	1,629,463
-1	The Company used the average credit rating of the combination of S&P, Moody’s and Fitch in the above table where ratings differed.
-2	Securities values are shown at carrying value as of December 31, 2013. Unrated securities consist of CRA investments with a carrying value of $23.3 million, one ARPS with a carrying value of $2.4 million and an other investment of $1.6 million.
-3	At least 80% of mutual funds are investment grade corporate debt securities.
Securities with carrying amounts of approximately $739.2 million and $662.5 million at March 31, 2014 and December 31, 2013, respectively, were pledged for various purposes as required or permitted by law.
The following table presents gross gains and losses on sales of investment securities:
		Three Months Ended March 31,
		2014		2013
		(in thousands)
Gross gains		$	366	$	200
Gross losses		—		(53		)
Net gains		$	366	$	147

Loans_Leases_and_Allowance_for

Loans, Leases and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2014
Receivables [Abstract]	'
Loans, Leases and Allowance for Credit Losses	'
	LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES
	The composition of the Company’s loan portfolio is as follows:
		March 31, 2014				December 31, 2013
		(in thousands)
	Commercial and industrial	$	2,501,499			$	2,236,740
	Commercial real estate - non-owner occupied	1,849,211				1,843,415
	Commercial real estate - owner occupied	1,606,243				1,561,862
	Construction and land development	553,655				537,231
	Residential real estate	344,859				350,312
	Commercial leases	221,916				235,968
	Consumer	38,330				45,153
	Deferred fees and costs	(7,114		)		(9,266		)
	Loans, net of deferred fees and costs	7,108,599				6,801,415
	Allowance for credit losses	(103,899		)		(100,050		)
	Total	$	7,004,700			$	6,701,365
	The following table presents the contractual aging of the recorded investment in past due loans by class of loans and excluding deferred fees and costs:
		31-Mar-14
		Current				30-59 Days				60-89 Days				Over 90 days				Total				Total
						Past Due				Past Due				Past Due				Past Due
		(in thousands)
	Commercial real estate
	Owner occupied	$	1,597,539			$	4,416			$	996			$	3,292			$	8,704			$	1,606,243
	Non-owner occupied	1,651,963				17,824				1,548				6,454				25,826				1,677,789
	Multi-family	171,422				—				—				—				—				171,422
	Commercial and industrial
	Commercial	2,499,734				651				216				898				1,765				2,501,499
	Leases	221,916				—				—				—				—				221,916
	Construction and land development
	Construction	310,599				479				—				—				479				311,078
	Land	241,234				—				—				1,343				1,343				242,577
	Residential real estate	330,550				2,764				4,286				7,259				14,309				344,859
	Consumer	37,882				270				11				167				448				38,330
	Total loans	$	7,062,839			$	26,404			$	7,057			$	19,413			$	52,874			$	7,115,713
		31-Dec-13
		Current				30-59 Days				60-89 Days				Over 90 days				Total				Total
						Past Due				Past Due				Past Due				Past Due
		(in thousands)
	Commercial real estate
	Owner occupied	$	1,555,210			$	1,759			$	406			$	4,487			$	6,652			$	1,561,862
	Non-owner occupied	1,627,062				8,774				4,847				15,767				29,388				1,656,450
	Multi-family	186,965				—				—				—				—				186,965
	Commercial and industrial
	Commercial	2,232,186				1,868				233				2,453				4,554				2,236,740
	Leases	235,618				—				—				350				350				235,968
	Construction and land development
	Construction	291,883				—				—				—				—				291,883
	Land	243,741				264				1,343				—				1,607				245,348
	Residential real estate	339,566				2,423				1,368				6,955				10,746				350,312
	Consumer	44,018				466				155				514				1,135				45,153
	Total loans	$	6,756,249			$	15,554			$	8,352			$	30,526			$	54,432			$	6,810,681
	The following table presents the recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing interest by class of loans:
		31-Mar-14																31-Dec-13
		Non-accrual loans												Loans past due 90 days or more and still accruing				Non-accrual loans									Loans past due 90 days or more and still accruing
		Current				Past Due/				Total								Current				Past Due/			Total
						Delinquent				Non-accrual												Delinquent			Non-accrual
		(in thousands)
	Commercial real estate
	Owner occupied	$	6,663			$	4,460			$	11,123			$	—			$	9,330			$	3,600		$	12,930	$	887
	Non-owner occupied	15,454				22,306				37,760				—				17,930				23,996			41,926		—
	Multi-family	—				—				—				—				—				—			—		—
	Commercial and industrial
	Commercial	1,534				1,104				2,638				—				622				2,682			3,304		125
	Leases	432				—				432				—				99				350			449		—
Construction and land development
Construction	—				—				—				—				—				—			—		—
Land	2,277				1,341				3,618				—				3,133				1,392			4,525		—
Residential real estate	2,751				12,051				14,802				—				5,067				7,413			12,480		47
Consumer	28				—				28				167				27				39			66		475
Total	$	29,139			$	41,262			$	70,401			$	167			$	36,208			$	39,472		$	75,680	$	1,534
The reduction in interest income associated with loans on nonaccrual status was approximately $1.0 million and $1.2 million for the three months ended March 31, 2014 and 2013, respectively.
The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company’s risk rating system, the Company classifies problem and potential problem loans as “Special Mention,” “Substandard,” “Doubtful,” and “Loss.” Substandard loans include those characterized by well-defined weaknesses and carry the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful, or risk rated eight, have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The final rating of Loss covers loans considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses that deserve management’s close attention, are deemed to be Special Mention. Risk ratings are updated, at a minimum, quarterly. The following tables present gross loans by risk rating:
	31-Mar-14
	Pass				Special Mention				Substandard				Doubtful				Loss				Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,525,617			$	33,638			$	46,355			$	633			$	—			$	1,606,243
Non-owner occupied	1,539,862				53,132				84,795				—				—				1,677,789
Multi-family	170,948				—				474				—				—				171,422
Commercial and industrial
Commercial	2,474,755				9,249				17,495				—				—				2,501,499
Leases	217,460				4,024				432				—				—				221,916
Construction and land development
Construction	310,599				479				—				—				—				311,078
Land	208,513				13,509				20,555				—				—				242,577
Residential real estate	317,513				3,044				24,302				—				—				344,859
Consumer	37,515				339				476				—				—				38,330
Total	$	6,802,782			$	117,414			$	194,884			$	633			$	—			$	7,115,713
	31-Mar-14
	Pass				Special Mention				Substandard				Doubtful				Loss				Total
	(in thousands)
Current (up to 29 days past due)	$	6,800,191			$	115,223			$	146,792			$	633			$	—			$	7,062,839
Past due 30 - 59 days	2,472				2,090				21,842				—				—				26,404
Past due 60 - 89 days	119				101				6,837				—				—				7,057
Past due 90 days or more	—				—				19,413				—				—				19,413
Total	$	6,802,782			$	117,414			$	194,884			$	633			$	—			$	7,115,713
	31-Dec-13
	Pass				Special Mention				Substandard				Doubtful				Loss				Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,483,190			$	33,065			$	44,649			$	958			$	—			$	1,561,862
Non-owner occupied	1,498,500				64,588				93,362				—				—				1,656,450
Multi-family	186,479				—				486				—				—				186,965
Commercial and industrial
Commercial	2,208,947				10,058				16,231				1,504				—				2,236,740
Leases	231,344				4,175				449				—				—				235,968
Construction and land development
Construction	291,402				481				—				—				—				291,883
Land	210,615				13,762				20,971				—				—				245,348
Residential real estate	323,333				3,037				23,942				—				—				350,312
Consumer	43,516				799				838				—				—				45,153
Total	$	6,477,326			$	129,965			$	200,928			$	2,462			$	—			$	6,810,681
	31-Dec-13
	Pass				Special Mention				Substandard				Doubtful				Loss				Total
	(in thousands)
Current (up to 29 days past due)	$	6,471,951			$	129,208			$	154,441			$	649			$	—			$	6,756,249
Past due 30 - 59 days	4,205				602				10,747				—				—				15,554
Past due 60 - 89 days	1,123				155				7,074				—				—				8,352
Past due 90 days or more	47				—				28,666				1,813				—				30,526
Total	$	6,477,326			$	129,965			$	200,928			$	2,462			$	—			$	6,810,681
The table below reflects recorded investment in loans classified as impaired:
	March 31, 2014				December 31, 2013
	(in thousands)
Impaired loans with a specific valuation allowance under FASB ASC 310	$	22,127			$	25,754
Impaired loans without a specific valuation allowance under FASB ASC 310	149,135				152,623
Total impaired loans	$	171,262			$	178,377
Valuation allowance related to impaired loans	$	(3,925	)		$	(5,280	)
The following table presents the impaired loans by class:
	March 31, 2014				December 31, 2013
	(in thousands)
Commercial real estate
Owner occupied	$	35,329			$	37,902
Non-owner occupied	68,756				73,152
Multi-family	—				—
Commercial and industrial
Commercial	15,233				449
Leases	432				16,892
Construction and land development
Construction	—				—
Land	22,012				23,069
Residential real estate	29,026				26,376
Consumer	474				537
Total	$	171,262			$	178,377
A valuation allowance is established for an impaired loan when the fair value of the loan is less than the recorded investment. In certain cases, portions of impaired loans are charged-off to realizable value instead of establishing a valuation allowance and are included, when applicable in the table above as “Impaired loans without specific valuation allowance under FASB ASC 310.” The valuation allowance disclosed above is included in the allowance for credit losses reported in the Consolidated Balance Sheets as of March 31, 2014 and December 31, 2013.
The following table presents average investment in impaired loans by loan class:
	Three Months Ended March 31,
	2014				2013
	(in thousands)
Commercial real estate
Owner occupied	$	36,748			$	60,065
Non-owner occupied	70,039				52,986
Multi-family	—				230
Commercial and industrial
Commercial	15,583				15,088
Leases	439				1,028
Construction and land development
Construction	—				—
Land	22,586				29,362
Residential real estate	26,799				37,040
Consumer	502				705
Total	$	172,696			$	196,504
The following table presents interest income on impaired loans by class:
	Three Months Ended March 31,
	2014				2013
	(in thousands)
Commercial real estate
Owner occupied	$	391			$	420
Non-owner occupied	373				404
Multi-family	—				—
Commercial and industrial
Commercial	193				150
Leases	—				—
Construction and land development
Construction	—				—
Land	261				259
Residential real estate	157				5
Consumer	11				8
Total	$	1,386			$	1,246
The Company is not committed to lend significant additional funds on these impaired loans.
The following table summarizes nonperforming assets:
	March 31, 2014				December 31, 2013
	(in thousands)
Nonaccrual loans	$	70,401			$	75,680
Loans past due 90 days or more on accrual status	167				1,534
Troubled debt restructured loans	89,524				89,576
Total nonperforming loans	160,092				166,790
Other assets acquired through foreclosure, net	56,450				66,719
Total nonperforming assets	$	216,542			$	233,509
Loans Acquired with Deteriorated Credit Quality
Changes in the accretable yield for loans acquired with deteriorated credit quality are as follows:
	Three Months Ended March 31,
	2014				2013
	(in thousands)
Balance, at beginning of period	$	28,164			$	7,072
Reclassification from non-accretable to accretable yield	1,466				—
Accretion to interest income	(2,404		)		(2,079		)
Reversal of fair value adjustments upon disposition of loans	(395		)		—
Balance, at end of period	$	26,831			$	4,993
The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.
Allowance for Credit Losses
The following table summarizes the changes in the allowance for credit losses by portfolio type:
	Three Months Ended March 31,
	Construction and Land Development				Commercial				Residential				Commercial				Consumer				Total
					Real Estate				Real Estate				and Industrial
	(in thousands)
2014
Beginning Balance	$	14,519			$	32,064			$	11,640			$	39,657			$	2,170			$	100,050
Charge-offs	—				(171		)		(406		)		(1,478		)		(12		)		(2,067		)
Recoveries	211				560				553				922				170				2,416
Provision	1,970				2,400				(490		)		392				(772		)		3,500
Ending balance	$	16,700			$	34,853			$	11,297			$	39,493			$	1,556			$	103,899
2013
Beginning Balance	$	10,554			$	34,982			$	15,237			$	32,860			$	1,794			$	95,427
Charge-offs	(614		)		(2,887		)		(2,493		)		(1,770		)		(275		)		(8,039		)
Recoveries	701				942				569				441				14				2,667
Provision	398				1,864				1,282				2,654				(759		)		5,439
Ending balance	$	11,039			$	34,901			$	14,595			$	34,185			$	774			$	95,494
The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment:
	Commercial				Commercial				Commercial				Residential				Construction				Commercial			Consumer		Total
	Real Estate-				Real Estate-				and				Real				and Land				Leases					Loans
	Owner				Non-Owner				Industrial				Estate				Development
	Occupied				Occupied
	(in thousands)
Loans as of March 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	1,462			$	13,503			$	940			$	6,111			$	—			$	83		$	28	$	22,127
Impaired loans with no allowance recorded	33,867				55,253				14,293				22,915				22,012				349			446		149,135
Total loans individually evaluated for impairment	35,329				68,756				15,233				29,026				22,012				432			474		171,262
Loans collectively evaluated for impairment	1,548,059				1,691,360				2,486,004				313,376				531,615				221,484			37,856		6,829,754
Loans acquired with deteriorated credit quality	22,855				89,095				262				2,457				28				—			—		114,697
Total loans	$	1,606,243			$	1,849,211			$	2,501,499			$	344,859			$	553,655			$	221,916		$	38,330	$	7,115,713
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	1,462			$	13,503			$	1,153			$	6,260			$	—			$	83		$	28	$	22,489
Impaired loans with no allowance recorded	39,398				58,050				14,859				28,567				23,117				501			459		164,951
Total loans individually evaluated for impairment	40,860				71,553				16,012				34,827				23,117				584			487		187,440
Loans collectively evaluated for impairment	1,548,059				1,691,360				2,486,004				313,376				531,615				221,484			37,856		6,829,754
Loans acquired with deteriorated credit quality	30,841				120,728				870				3,709				100				—			—		156,248
Total loans	$	1,619,760			$	1,883,641			$	2,502,886			$	351,912			$	554,832			$	222,068		$	38,343	$	7,173,442
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	450			$	803			$	666			$	1,938			$	—			$	65		$	3	$	3,925
Impaired loans with no allowance recorded	—				—				—				—				—				—			—		—
Total loans individually evaluated for impairment	450				803				666				1,938				—				65			3		3,925
Loans collectively evaluated for impairment	13,563				18,625				36,155				9,359				16,700				2,607			1,553		98,562
Loans acquired with deteriorated credit quality	—				1,412				—				—				—				—			—		1,412
Total loans	$	14,013			$	20,840			$	36,821			$	11,297			$	16,700			$	2,672		$	1,556	$	103,899
	Commercial				Commercial				Commercial				Residential				Construction				Commercial			Consumer		Total
	Real Estate-				Real Estate-				and				Real				and Land				Leases					Loans
	Owner				Non-Owner				Industrial				Estate				Development
	Occupied				Occupied
	(in thousands)
Loans as of December 31, 2013:
Recorded Investment:
Impaired loans with an allowance recorded	$	1,092			$	17,932			$	1,907			$	4,580			$	118			$	99		$	26	$	25,754
Impaired loans with no allowance recorded	36,810				55,220				14,985				21,796				22,951				350			511		152,623
Total loans individually evaluated for impairment	37,902				73,152				16,892				26,376				23,069				449			537		178,377
Loans collectively evaluated for impairment	1,500,740				1,678,242				2,219,500				321,683				513,681				235,519			44,616		6,513,981
Loans acquired with deteriorated credit quality	23,220				92,021				348				2,253				481				—			—		118,323
Total loans	$	1,561,862			$	1,843,415			$	2,236,740			$	350,312			$	537,231			$	235,968		$	45,153	$	6,810,681
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	1,092			$	19,273			$	2,120			$	4,729			$	118			$	99		$	27	$	27,458
Impaired loans with no allowance recorded	43,537				58,322				15,731				27,550				24,137				502			523		170,302
Total loans individually evaluated for impairment	44,629				77,595				17,851				32,279				24,255				601			550		197,760
Loans collectively evaluated for impairment	1,500,740				1,678,242				2,219,500				321,683				513,681				235,519			44,616		6,513,981
Loans acquired with deteriorated credit quality	34,951				130,279				1,403				3,728				804				—			—		171,165
Total loans	$	1,580,320			$	1,886,116			$	2,238,754			$	357,690			$	538,740			$	236,120		$	45,166	$	6,882,906
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	402			$	2,121			$	702			$	1,896			$	85			$	70		$	4	$	5,280
Impaired loans with no allowance recorded	—				—				—				—				—				—			—		—
Total loans individually evaluated for impairment	402				2,121				702				1,896				85				70			4		5,280
Loans collectively evaluated for impairment	12,158				17,061				36,344				9,744				14,434				2,541			2,166		94,448
Loans acquired with deteriorated credit quality	—				322				—				—				—				—			—		322
Total loans	$	12,560			$	19,504			$	37,046			$	11,640			$	14,519			$	2,611		$	2,170	$	100,050
For the first quarter of 2013, the baseline historical loss rates were computed using a weighted ratio of the 1-year and 5-year historical loss rates. As the market environment improved throughout 2013 and shorter-term loss rates compressed below longer-term levels, the Company determined during the fourth quarter of 2013 that the 5-year historical loss rates were a better representation of longer-term expectations for probable losses. Accordingly, the allowance calculation for the quarter ended March 31, 2014 continues to apply a 100% weight to the 5-year historical loss rate (per loan category).
Troubled Debt Restructurings
A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, extensions, deferrals, renewals and rewrites. The majority of the Company’s modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. A troubled debt restructured loan is also considered impaired. Generally, a loan that is modified at an effective market rate of interest may no longer be disclosed as a TDR in years subsequent to the restructuring if it is not impaired based on the terms specified by the restructuring agreement.
The following table presents information on the financial effects of TDR loans by class for the periods presented:
	Three Months Ended March 31, 2014
	Number			Pre-Modification				Forgiven				Lost				Post-Modification				Waived Fees
	of Loans			Outstanding				Principal				Interest				Outstanding				and Other
				Recorded Investment				Balance				Income				Recorded Investment				Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	1			$	798			$	378			$	117			$	303			$	33
Non-owner occupied	—			—				—				—				—				—
Multi-family	—			—				—				—				—				—
Commercial and industrial
Commercial	1			63				—				—				63				3
Leases	—			—				—				—				—				—
Construction and land development
Construction	—			—				—				—				—				—
Land	—			—				—				—				—				—
Residential real estate	1			405				166				37				202				—
Consumer	—			—				—				—				—				—
Total	3			$	1,266			$	544			$	154			$	568			$	36
	Three Months Ended March 31, 2013
	Number			Pre-Modification				Forgiven				Lost				Post-Modification				Waived Fees
	of Loans			Outstanding				Principal				Interest				Outstanding				and Other
				Recorded Investment				Balance				Income				Recorded Investment				Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	5			$	2,686			$	—			$	54			$	2,632			$	—
Non-owner occupied	4			10,318				1,030				63				9,225				7
Multi-family	—			—				—				—				—				—
Commercial and industrial
Commercial	5			1,846				—				10				1,836				8
Leases	—			—				—				—				—				—
Construction and land development
Construction	—			—				—				—				—				—
Land	2			286				—				—				286				1
Residential real estate	1			40				—				6				34				3
Consumer	1			39				—				—				39				3
Total	18			$	15,215			$	1,030			$	133			$	14,052			$	22
The following table presents TDR loans by class for which there was a payment default during the period:
	Three Months Ended March 31,
	2014							2013
	Number			Recorded				Number			Recorded
	of Loans			Investment				of Loans			Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	1			$	303			3			$	2,506
Non-owner occupied	—			—				1			160
Multi-family	—			—				—			—
Commercial and industrial
Commercial	1			63				2			782
Leases	—			—				—			—
Construction and land development
Construction	—			—				—			—
Land	—			—				2			330
Residential real estate	1			202				2			655
Consumer	—			—				—			—
Total	3			$	568			10			$	4,433
A TDR loan is deemed to have a payment default when it becomes past due 90 days, goes on nonaccrual, or is re-structured again. Payment defaults, along with other qualitative indicators, are considered by management in the determination of the allowance for credit losses.
At March 31, 2014 and December 31, 2013, there were no loan commitments outstanding on TDR loans.
Loan Purchases and Sales
For the three months ended March 31, 2014 and 2013, the Company had secondary market loan purchases of $15.6 million and $43.0 million, respectively. For 2014 and 2013, these purchased loans consisted of commercial and industrial loans. In addition, the Company periodically acquires newly originated loans at closing through participations or loan syndications.
The Company had no significant loan sales in 2014 or 2013.

Other_Assets_Acquired_Through_

Other Assets Acquired Through Foreclosure	3 Months Ended
	Mar. 31, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'
Other Assets Acquired Through Foreclosure	'
	OTHER ASSETS ACQUIRED THROUGH FORECLOSURE
	The following table represents the changes in other assets acquired through foreclosure:
			Three Months Ended March 31,
			2014
			Gross Balance			Valuation Allowance			Net Balance
			(in thousands)
	Balance, beginning of the period		$	88,421		$	(21,702	)	$	66,719
	Transfers to other assets acquired through foreclosure, net		2,110			—			2,110
	Proceeds from sale of other real estate owned and repossessed assets, net		(19,473		)	5,961			(13,512		)
	Valuation adjustments, net		—			(35		)	(35		)
	Gains, net (1)		1,168			—			1,168
	Balance, end of period		$	72,226		$	(15,776	)	$	56,450
			2013
	Balance, beginning of the period		$	113,474		$	(36,227	)	$	77,247
	Transfers to other assets acquired through foreclosure, net		6,609			—			6,609
	Proceeds from sale of other real estate owned and repossessed assets, net		(12,120		)	6,747			(5,373		)
	Valuation adjustments, net		—			(1,017		)	(1,017		)
	Gains, net (1)		455			—			455
	Balance, end of period		$	108,418		$	(30,497	)	$	77,921
	-1	Includes gains related to initial transfers to other assets of zero and $0.3 million during the three months ended March 31, 2014 and 2013, respectively, pursuant to accounting guidance.
	At March 31, 2014 and 2013, the majority of the Company’s repossessed assets consisted of properties located in Nevada.

Other_Borrowings

Other Borrowings	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Other Borrowings	'
	OTHER BORROWINGS
	The following table summarizes the Company’s borrowings as of March 31, 2014 and December 31, 2013:
		March 31, 2014		December 31, 2013
		(in thousands)
	Short-Term:
	Revolving line of credit	$	5,000	$	3,000
	FHLB advances	56,324		25,906
	Total short-term borrowings	$	61,324	$	28,906
	Long-Term:
	FHLB advances	$	217,166	$	247,973
	Other long term debt	64,326		64,217
	Total long-term borrowings	$	281,492	$	312,190
	WAL maintains other lines of credit totaling $70.0 million, of which $25.0 million is secured by pledged securities and $45.0 million is unsecured. As of March 31, 2014, the Company had outstanding advances on the $25.0 million secured line of credit totaling $5.0 million at an interest rate of 1.75%. There were no amounts outstanding on the unsecured lines of credit. In addition, the bank has entered into Fed Funds agreements with other financial institutions under which it can borrow up to $120.0 million on an unsecured basis. There were no amounts outstanding on these lines of credit as of March 31, 2014. The lending institutions will determine the interest rate charged on borrowings at the time of the borrowing.
	The Company maintains lines of credit with the FHLB and FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. At March 31, 2014, there was $56.3 million of FHLB advances classified as short-term, with a weighted average interest rate of 2.91%. At December 31, 2013, short-term FHLB advances had a weighted average interest rate of 2.90%.
	At March 31, 2014, there was $217.2 million of FHLB advances classified as long-term and $64.9 million of outstanding Senior Note principal, whose carrying value of $64.3 million reflects a discount of $0.6 million. The weighted average rate on all long-term debt was 3.16% and 3.65% for the three months ended March 31, 2014 and 2013, respectively.
	As of March 31, 2014 and December 31, 2013, the Company had additional available credit with the FHLB of approximately $1.03 billion and $1.39 billion, respectively, and with the FRB of approximately $1.00 billion and $588.2 million, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Unfunded Commitments and Letters of Credit
	The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the consolidated balance sheets.
	Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of standby letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the standby letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.
	Standby letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within one year.
	A summary of the contractual amounts for unfunded commitments and letters of credit are as follows:
		March 31, 2014		December 31, 2013
		(in thousands)
	Commitments to extend credit, including unsecured loan commitments of $221,669 at March 31, 2014 and $237,063 at December 31, 2013	$	1,840,740	$	1,878,340
	Credit card commitments and financial guarantees	33,932		33,632
	Standby letters of credit, including unsecured letters of credit of $5,957 at March 31, 2014 and $4,896 at December 31, 2013	38,501		31,271
	Total	$	1,913,173	$	1,943,243
	Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.
	The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are not included in the allowance for credit losses reported in "Note 3. Loans, Leases and Allowance for Credit Losses" of the Unaudited Consolidated Financial Statements and are accounted for as a separate loss contingency. This loss contingency for unfunded loan commitments and letters of credit was $2.1 million and $2.0 million as of March 31, 2014 and December 31, 2013, respectively. Changes to this liability are adjusted through non-interest expense.
	Concentrations of Lending Activities
	The Company’s lending activities are driven in large part by the customers served in the market areas where the Company has branch offices in the states of Arizona, Nevada and California. Despite the geographic concentration of lending activities, the Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations within five broad categories: geography, industry, product, call code, and collateral. The Company grants commercial, construction, real estate and consumer loans to customers through branch offices located in the Company’s primary markets. The Company’s business is concentrated in these areas and the loan portfolio includes significant credit exposure to the CRE market of these areas. As of March 31, 2014 and December 31, 2013, CRE related loans accounted for approximately 56% and 58% of total loans, respectively, and approximately 1% and 2%, respectively, of CRE related loans are secured by undeveloped land. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 47% and 46% of these CRE loans, excluding construction and land loans, were owner occupied at March 31, 2014 and December 31, 2013, respectively. In addition, approximately 3% and 4% of total loans were unsecured as of March 31, 2014 and December 31, 2013, respectively.
	Contingencies
	The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.
	Lease Commitments
	The Company leases the majority of its office locations and many of these leases contain multiple renewal options and provisions for increased rents. Total rent expense of $1.6 million and $1.9 million was included in occupancy expenses for the three months ended March 31, 2014 and 2013, respectively.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Stockholder's Equity	'
	STOCKHOLDERS’ EQUITY
	For the three months ended March 31, 2014, 376,175 shares of restricted stock were granted to Company employees that vest over three years and 64,000 shares were granted to non-employee WAL and WAB directors that vest over six months. The Company estimates the compensation cost for restricted stock grants based upon the grant date fair value. The aggregate grant date fair value for the restricted stock issued in the three month period ended March 31, 2014 was $10.5 million.
	There were approximately 1,161,743 and 1,204,216 restricted shares outstanding at March 31, 2014 and December 31, 2013, respectively. For the three months ended March 31, 2014, the Company recognized $0.3 million in stock-based compensation expense related to restricted stock grants, compared to $1.0 million in expense for the three months ended March 31, 2013. Other restricted stock components causing the reduction of $3.4 million to APIC during the three months ended March 31, 2014 include shares withheld on cashless exercises and forfeitures.
	As of March 31, 2014 and December 31, 2013, there were 0.8 million and 1.0 million, respectively, of stock options outstanding.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Income	'
	ACCUMULATED OTHER COMPREHENSIVE INCOME
	The following table summarizes the changes in accumulated other comprehensive loss by component, net of tax, for the periods indicated:
		Three Months Ended March 31,
		2014									2013
		Unrealized			Impairment loss on securities			Total			Unrealized			Unrealized gain on cash flow hedge			Total
		holding gains									holding gains
		(losses) on AFS securities									(losses) on AFS securities
		(in thousands)
	Beginning balance	$	(21,690	)	$	144		$	(21,546	)	$	8,209		$	17		$	8,226
	Other comprehensive income (loss) before reclassifications	10,644			—			10,644			(890		)	(34		)	(924		)
	Amounts reclassified from accumulated other comprehensive loss	(229		)	—			(229		)	(97		)	—			(97		)
	Net current-period other comprehensive income (loss)	10,415			—			10,415			(987		)	(34		)	(1,021		)
	Ending balance	$	(11,275	)	$	144		$	(11,131	)	$	7,222		$	(17	)	$	7,205
	The following table presents reclassifications out of accumulated other comprehensive loss:
		Amount reclassified from accumulated other comprehensive income
	Details about accumulated other	Three Months Ended March 31,						Affected line item in the statement
	comprehensive loss components	2014			2013			where net income is presented
		(in thousands)
	Unrealized gains and losses on AFS
		$	366		$	147		Gain on sales of investment securities, net
		(137		)	(50		)	Income tax expense
		$	229		$	97		Net of tax

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	EARNINGS PER SHARE
	Diluted earnings per share is based on the weighted average outstanding common shares during each period, including common stock equivalents. Basic earnings per share is based on the weighted average outstanding common shares during the period.
	The following table presents the calculation of basic and diluted earnings per share for the three months ended March 31, 2014 and 2013.
		Three Months Ended March 31,
		2014		2013
		(in thousands, except per share amounts)
	Weighted average shares - basic	86,256		85,324
	Dilutive effect of stock awards	867		656
	Weighted average shares - diluted	87,123		85,980
	Net income available to common shareholders	$	30,732	$	20,532
	Earnings per share - basic	0.35		0.24
	Earnings per share - diluted	0.35		0.24
	The Company had 4,000 and 163,300 stock options outstanding as of March 31, 2014 and December 31, 2013, respectively, that were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.
	For the three months ended March 31, 2014, the net deferred tax assets decreased $2.4 million to $78.3 million. This overall decrease in the net deferred tax asset was primarily the result of increases to deferred tax assets from AMT credit carryovers along with a release of valuation allowance, which were more than offset by the decreases to deferred tax assets from exercises and forfeitures of equity compensation, changes in the fair market value of AFS securities and fair market value adjustments related to acquired loans.
	Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $78.3 million at March 31, 2014 is more likely than not based on expectations as to future taxable income and based on available tax planning strategies within the meaning of FASB ASC 740 that could be implemented if necessary to prevent a carryover from expiring.
	At March 31, 2014 and December 31, 2013, the Company had a $4.6 million and a $5.6 million deferred tax valuation allowance, respectively. As of March 31, 2014, $3.2 million relates to net capital loss carryovers from ARPS securities sales and the remaining valuation allowance of $1.4 million relates to Arizona state NOL carryovers and Section 382 of the IRC limitations associated with the Company's acquisition of Western Liberty Bancorp.
	The deferred tax asset related to federal and state net operating loss carryovers outstanding at March 31, 2014 available to reduce tax liability in future years totaled $9.8 million. This is comprised of $8.3 million of tax benefits from federal net operating loss carryovers (subject to an annual limitation imposed by section 382 of the IRC as discussed below) and $1.5 million of tax benefits from Arizona state net operating loss carryovers that began to expire in 2013. The Company’s ability to use federal NOLs, as well as its ability to use certain future tax deductions called NUBILs associated with the Company's acquisitions of Western Liberty Bancorp and Centennial Bank, will be subject to separate annual limitations of $1.8 million and $1.6 million of deductions from taxable income, respectively. In management’s opinion, it is more likely than not that the results of future operations will generate sufficient taxable income to realize all but $1.4 million of the deferred tax benefits related to these net operating loss carryovers and NUBILs.
	The Company's effective tax rate was 25.08% and 27.19% for the three months ended March 31, 2014 and 2013, respectively. The decrease in the effective tax rate from the first quarter 2013 compared to the first quarter 2014 is primarily due to increased benefits received from qualified affordable housing projects and an increase to the expected amount of tax exempt interest income for the year, which were not fully offset by rate detriments from a decrease in the projected amount of BOLI income.
	Investments in LIHTC
	The Company invests in LIHTC funds that are designed to generate a return primarily through the realization of federal tax credits.
	The Company adopted the amendments to FASB ASC 323-740 as of January 1, 2014, which revises the accounting for investments in qualified affordable housing projects. As a result, the Company has adjusted its prior period financial statements to apply the proportional amortization methodology in accounting for these investments. This impacted the balance of tax credit investments and related current and deferred tax items on the Consolidated Balance Sheets. In accordance with FASB ASC 323-740, the tax credit investment amortization is now presented as a component of income tax expense. Previously, the amortization expense was included as a component of non-interest income.
	The following table summarizes the impact of the change in the Consolidated Financial Statements for the periods indicated:
		December 31, 2013
		(in thousands)
	Consolidated Balance Sheet:
	Deferred tax assets, net
	As previously reported	$	79,374
	As reported under new guidance	80,688
	Other assets
	As previously reported (1)	186,288
	As reported under new guidance	185,221
	Stockholders' Equity
	As previously reported	855,251
	As reported under new guidance	855,498
	-1	Includes a $14.6 million reclassification from premises and equipment, net.
		Three Months Ended
		March 31, 2013
		(in thousands)
	Consolidated Income Statement:
	Non-interest income
	As previously reported	$	3,899
	As reported under new guidance	4,799
	Income tax expense
	As previously reported	6,808
	As reported under new guidance	7,787
	Income from continuing operations
	As previously reported	20,926
	As reported under new guidance	20,847
	Net income
	As previously reported	20,964
	As reported under new guidance	20,885
	Net income available to common shareholders
	As previously reported	20,611
	As reported under new guidance	20,532
	Earnings per share applicable to common shareholders--basic
	As previously reported	0.24
	As reported under new guidance	0.24
	Earnings per share applicable to common shareholders--diluted
	As previously reported	0.24
	As reported under new guidance	0.24
	The cumulative effect of adoption of this guidance at December 31, 2013 was an increase to stockholders' equity of $0.2 million and a decrease to stockholder's equity of $0.2 million at December 31, 2012.
	Investments in LIHTC and unfunded LIHTC obligations are included as part of other assets and other liabilities, respectively, in the Consolidated Balance Sheet and total $129.3 million and $68.3 million, respectively, as of March 31, 2014. For the three months ended March 31, 2014, $3.0 million of amortization related to LIHTC investments was recognized as a component of income tax expense.

Fair_Value_Accounting

Fair Value Accounting	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Accounting	'
	FAIR VALUE ACCOUNTING
	The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. FASB ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under FASB ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements.
	In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, 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 at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels in the fair value hierarchy are recognized at the end of the reporting period.
	Under FASB ASC 825, the Company elected the FVO treatment for the junior subordinated debt and certain investment securities. This election is generally irrevocable and unrealized gains and losses on these items must be reported in earnings at each reporting date. The Company continues to account for these items under the FVO. Since adoption, there were no financial instruments purchased by the Company which met the FASB ASC 825 fair value election criteria, and therefore, no additional instruments have been added under the FVO election.
	All securities for which the fair value measurement option had been elected are included in a separate line item on the balance sheet entitled “securities measured at fair value.”
	For the three months ended March 31, 2014 and 2013, gains and losses from fair value changes included in the Consolidated Income Statements were as follows:
			Changes in Fair Values for Items Measured at Fair Value Pursuant to Election of the Fair Value Option
	Description		Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net				Interest Income on Securities			Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings
			(in thousands)
	Three Months Ended March 31, 2014
	Securities measured at fair value		$	18			$	1		$	—		$	19
	Junior subordinated debt		(978		)		—			(421		)	(1,399		)
	Total		$	(960	)		$	1		$	(421	)	$	(1,380	)
	Three Months Ended March 31, 2013
	Securities measured at fair value		$	(2	)		$	2		$	—		$	—
	Junior subordinated debt		(469		)		—			(466		)	(935		)
	Total		$	(471	)		$	2		$	(466	)	$	(935	)
	The following table presents the portion of trading securities losses related to trading securities still held at the reporting date:
			March 31,
			2014				2013
			(in thousands)
	Net gains and (losses) for the period on trading securities included in earnings		$	18			$	(2	)
	Less: net gains and (losses) recognized during the period on trading securities sold during the period		—				—
	Change in unrealized gains or (losses) for the period included in earnings for trading securities held at the end of the reporting period		$	18			$	(2	)
	Interest income on securities measured at fair value is accounted for similarly to those classified as AFS and HTM. Any premiums or discounts are recognized in interest income over the term of the securities. For mortgage-backed securities, estimates of prepayments are considered in the constant yield calculations. Interest expense on junior subordinated debt is also determined under a constant yield calculation.
	Fair value on a recurring basis
	Financial assets and financial liabilities measured at fair value on a recurring basis include the following:
	AFS Securities: ARPS securities, trust preferred securities, corporate debt securities and CRA mutual fund investments are reported at fair value utilizing Level 1 inputs. Other securities classified as AFS are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things.
	Securities measured at fair value: All of the Company’s securities measured at fair value, the majority of which are mortgage-backed securities, are reported at fair value utilizing Level 2 inputs in the same manner as described above for securities available for sale.
	Independent pricing service: Our independent pricing service provides pricing information on Level 1, 2 and 3 securities, and represents the pricing source for the majority of the portfolio. Management independently evaluates fair value measurements received from our third-party pricing service through multiple review steps. First, management reviews what has transpired in the market-place with respect to interest rates, credit spreads, volatility, mortgage rates, among other things, and makes an expectation on changes to the securities valuations from the previous quarter. Then management obtains market values from additional sources. The pricing service provides management with observable market data, including interest rate curves and mortgage prepayment speed grids, as well as dealer quote sheets, new bond offering sheets, and historical trade documentation. Management reviews the assumptions and decides whether they are reasonable. Management may compare interest rates, credit spreads and prepayments speeds used as part of the assumptions to those that management believes are reasonable. Management may price securities using the provided assumptions to determine whether they can develop similar prices on like securities. Any discrepancies with management’s review and the prices provided by the vendor are discussed with the vendor and the Company’s other valuation advisors. Last, management selects a sample of investment securities and compares the values provided by our primary third party pricing service to the market values obtained from secondary sources and evaluates those with notable variances.
	Annually, the Company receives an SSAE 16 report from its independent pricing service attesting to the controls placed on the operations of the service from its auditor.
	Interest rate swap: Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps.
	Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model, which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions were based on the contractual cash flows as the Company anticipates that it will pay the debt according to its contractual terms. During 2013, the Company established and continues to use the BB 20-Year Index adjusted for a credit risk spread. The Company estimated the discount rate at 5.692%, which is a 546 basis point spread over 3 month LIBOR (0.231% as of March 31, 2014). As of December 31, 2013, the Company estimated the discount rate at 5.861%, which was a 562 basis point spread over 3 month LIBOR 0.246%.
	The fair value of assets and liabilities measured at fair value on a recurring basis were determined using the following inputs at the periods presented:
			Fair Value Measurements at the End of the Reporting Period Using:
			Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs			Significant Unobservable Inputs			Fair Value
			(Level 1)				(Level 2)			(Level 3)
			(in thousands)
	31-Mar-14
	Assets:
	Measured at fair value
	Residential MBS issued by GSEs		$	—			$	2,460		$	—		$	2,460
	Private label residential MBS		—				483			—			483
	Total securities measured at fair value		$	—			$	2,943		$	—		$	2,943
	Available-for-sale
	U.S. government sponsored agency securities		$	—			$	57,672		$	—		$	57,672
	Municipal obligations		—				118,878			—			118,878
	Preferred stock		73,947				—			—			73,947
	Mutual funds		37,243				—			—			37,243
	Residential MBS issued by GSEs		—				987,407			—			987,407
	Commercial MBS issued by GSEs		—				2,034			—			2,034
	Private label residential MBS		—				35,615			—			35,615
	Private label commercial MBS		—				5,412			—			5,412
	Trust preferred		—				24,728			—			24,728
	CRA Investments		23,497				—			—			23,497
	Total AFS		$	134,687			$	1,231,746		$	—		$	1,366,433
	Positive NPVs on interest rate swaps		$	—			$	14,650		$	—		$	14,650
	Liabilities:
	Junior subordinated debt		$	—			$	—		$	42,836		$	42,836
	Negative NPVs on interest rate swaps		$	—			$	15,553		$	—		$	15,553
			Fair Value Measurements at the End of the Reporting Period Using:
			Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs			Significant Unobservable Inputs			Fair Value
			(Level 1)				(Level 2)			(Level 3)
		(in thousands)
31-Dec-13
Assets:
Measured at fair value
Residential MBS issued by GSEs		$	—			$	3,036		$	—		$	3,036
Available-for-sale
U.S. government sponsored agency securities		$	—			$	46,975		$	—		$	46,975
Municipal obligations		—				115,665			—			115,665
Preferred stock		61,484				—			—			61,484
Mutual funds		36,532				—			—			36,532
Residential MBS issued by GSEs		—				1,021,421			—			1,021,421
Private label residential MBS		—				36,099			—			36,099
Private label commercial MBS		—				5,433			—			5,433
Trust preferred		—				23,805			—			23,805
CRA Investments		23,282				—			—			23,282
Total AFS		$	121,298			$	1,249,398		$	—		$	1,370,696
Positive NPVs on interest rate swaps		$	—			$	2,783		$	—		$	2,783
Liabilities:
Junior subordinated debt		$	—			$	—		$	41,858		$	41,858
Negative NPVs on interest rate swaps		$	—			$	4,168		$	—		$	4,168
For the three months ended March 31, 2014 and 2013, the change in Level 3 liabilities measured at fair value on a recurring basis was as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Junior Subordinated Debt
	Three Months Ended March 31,
	2014				2013
	(in thousands)
Opening balance	$	(41,858	)		$	(36,218	)
Total losses for the period
Included in earnings (and changes in net assets) (a)	(978		)		(469		)
Closing balance	$	(42,836	)		$	(36,687	)
Change in unrealized losses for the three month period included in earnings (and changes in net assets)	$	(978	)		$	(469	)
(a)	Total losses for the period are included in the non-interest income line, unrealized losses on assets / liabilities measured at fair value, net.
For Level 3 liabilities measured at fair value on a recurring basis as of March 31, 2014 and December 31, 2013, the significant unobservable inputs used in the fair value measurements were as follows:
		Fair Value at				Valuation Technique		Significant Unobservable Inputs	Input Value
		March 31, 2014
		(dollars in thousands)
Junior subordinated debt		$	42,836			Discounted cash flow		BB Corporate Bond over Treasury Index with comparable credit spread	5.692	%
		Fair Value at				Valuation Technique		Significant Unobservable Inputs	Input Value
		December 31, 2013
		(dollars in thousands)
Junior subordinated debt		$	41,858			Discounted cash flow		BB Corporate Bond over Treasury Index with comparable credit spread	5.861	%
The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt are the calculated or estimated credit spreads on comparable publicly traded company trust preferred issuances, which were non-investment grade and non-rated. Significant increases (decreases) in these inputs could result in a significantly higher (lower) fair value measurement.
Fair value on a nonrecurring basis
Certain assets are measured at fair value on a nonrecurring basis. That is, the instruments are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the FASB ASC 825 hierarchy:
		Fair Value Measurements at the End of the Reporting Period Using
		Total				Quoted Prices in Active Markets for Identical Assets			Active Markets for Similar Assets			Unobservable Inputs
						(Level 1)			(Level 2)			(Level 3)
		(in thousands)
As of March 31, 2014:
Impaired loans with specific valuation allowance		$	18,202			$	—		$	—		$	18,202
Impaired loans without specific valuation allowance		91,925				—			—			91,925
Other assets acquired through foreclosure		56,450				—			—			56,450
31-Dec-13
Impaired loans with specific valuation allowance		$	20,474			$	—		$	—		$	20,474
Impaired loans without specific valuation allowance		95,695				—			—			95,695
Other assets acquired through foreclosure		66,719				—			—			66,719
Impaired loans: The specific reserves for collateral dependent impaired loans are based on the fair value of the collateral. The fair value of collateral is determined based on third-party appraisals. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. In some cases, adjustments are made to the appraised values due to various factors, including age of the appraisal (which are generally obtained every twelve months), age of comparables included in the appraisal and known changes in the market and in the collateral. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. These Level 3 impaired loans had an aggregate carrying amount of $22.1 million and $25.8 million, respectively, at March 31, 2014 and December 31, 2013. Specific reserves in the allowance for loan losses for these loans were $3.9 million and $5.3 million, respectively, at March 31, 2014 and December 31, 2013.
Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets classified as other assets acquired through foreclosure and other repossessed property and are initially reported at the fair value determined by independent appraisals using appraised value, less cost to sell. Such properties are generally re-appraised every six to twelve months. There is risk for subsequent volatility. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense. The Company had $56.5 million of such assets at March 31, 2014. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraisal, therefore qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement.
Credit vs. non-credit losses
Under the provisions of FASB ASC 320, OTTI is separated into the amount of total impairment related to the credit loss and the amount of the total impairment related to all other factors. The amount of the total OTTI related to the credit loss is recognized in earnings. The amount of the total impairment related to all other factors is recognized in other comprehensive income.
For the three months ended March 31, 2014 and 2013, the Company determined that no securities experienced credit losses.
The following table presents a rollforward of the amount related to impairment credit losses recognized in earnings for the three months ended March 31, 2014 and 2013:
	Private Label Mortgage- Backed Securities
	Three Months Ended
	2014				2013
	(in thousands)
Beginning balance of impairment losses held in other comprehensive income	$	—			$	(1,811	)
Current period OTTI credit losses recognized through earnings	—				—
Reductions for securities sold during the period	—				—
Additions or reductions in credit losses due to change of intent to sell	—				—
Reductions for increases in cash flows to be collected on impaired securities	—				—
Ending balance of net unrealized losses held in other comprehensive income	$	—			$	(1,811	)
FAIR VALUE OF FINANCIAL INSTRUMENTS
The estimated fair value of the Company’s financial instruments is as follows:
		31-Mar-14
		Carrying Amount				Fair Value
						Level 1			Level 2			Level 3			Total
		(in thousands)
Financial assets:
Investment securities:
HTM		$	275,738			$	10,781		$	270,694		$	8		$	281,483
AFS		1,366,433				134,687			1,231,746			—			1,366,433
Trading		2,943				—			2,943			—			2,943
Positive NPVs on interest rate swaps		14,650				—			14,650			—			14,650
Loans, net		7,004,700				—			6,358,264			110,127			6,468,391
Financial liabilities:
Deposits		8,148,973				—			8,152,956			—			8,152,956
Customer repurchases		57,407				—			57,407			—			57,407
Securities sold short		109,793				109,793			—			—			109,793
FHLB and FRB advances		273,490				—			273,490			—			273,490
Other borrowed funds		69,326				5,000			—			71,683			76,683
Junior subordinated debt		42,836				—			—			42,836			42,836
Negative NPVs on interest rate swaps		15,553				—			15,553			—			15,553
		31-Dec-13
		Carrying Amount				Fair Value
						Level 1			Level 2			Level 3			Total
		(in thousands)
Financial assets:
Investment securities:
HTM		$	283,006			$	22,200		$	259,496		$	8		$	281,704
AFS		1,370,696				121,298			1,249,398			—			1,370,696
Trading		3,036				—			3,036			—			3,036
Positive NPVs on interest rate swaps		2,783				—			2,783			—			2,783
Loans, net		6,701,365				—			6,090,962			116,169			6,207,131
Financial liabilities:
Deposits		7,838,205				—			7,842,014			—			7,842,014
Customer repurchases		71,192				—			71,192			—			71,192
FHLB and FRB advances		273,879				—			273,879			—			273,879
Other borrowed funds		67,217				3,000			—			71,475			74,475
Junior subordinated debt		41,858				—			—			41,858			41,858
Negative NPVs on interest rate swaps		4,168				—			4,168			—			4,168
Interest rate risk
The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments as well as its future net interest income will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.
Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in net portfolio value and net interest income resulting from hypothetical changes in interest rates. If potential changes to net portfolio value and net interest income resulting from hypothetical interest rate changes are not within the limits established by the Board of Directors, the Board may direct management to adjust the asset and liability mix to bring interest rate risk within Board-approved limits. As of March 31, 2014, the Company’s interest rate risk profile was within Board-approved limits.
WAB has an ALCO charged with managing interest rate risk within the Board of Directors approved limits. Limits are structured to prohibit an interest rate risk profile that is unacceptable to both management and Board of Directors risk tolerances. There is also an ALCO at the holding company level that reviews interest rate risk for the Company.
Fair value of commitments
The estimated fair value of standby letters of credit outstanding at March 31, 2014 and December 31, 2013 was insignificant. Loan commitments on which the committed interest rates were less than the current market rate are also insignificant at March 31, 2014 and December 31, 2013.

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Discontinued Operations	'
	DISPOSITIONS
	PartnersFirst Discontinued Operations
	The Company has discontinued its affinity credit card business, PartnersFirst, and has presented these activities as discontinued operations. The following table summarizes the operating results of the discontinued operations for the periods indicated:
		Three Months Ended March 31,
		2014			2013
		(in thousands)
	Operating revenue	$	(144	)	$	1,139
	Non-interest expenses	(858		)	(1,074		)
	(Loss) income before income taxes	(1,002		)	65
	Income tax (benefit) expense	(348		)	27
	Net (loss) income	$	(654	)	$	38

Segments

Segments	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Segments	'
	SEGMENTS
	On December 31, 2013, the Company consolidated its three bank subsidiaries under one charter, Western Alliance Bank. As a result, the Company has redefined its operating segments to reflect the new organizational and internal reporting structure. Prior year segment information has not been recast to conform to the new segmentation methodology due to the impracticability of restating segments because of the change in legal structure at December 31, 2013. The new operating segments are as follows: Arizona, Nevada, California, Specialty Finance and Corporate & Other.
	The Company's reportable segments are aggregated primarily based on geographic location, services offered and markets served. The Arizona, Nevada and California segments provide full service banking and related services to their respective markets. The Company's Specialty Finance segment provides banking services to niche markets. These Specialty Finance businesses are broader in geographic scope and are managed centrally. Corporate & Other consists of corporate-related items, income and expense items not allocated to our other reportable segments and inter-segment eliminations.
	The accounting policies of the reported segments are the same as those of the Company as described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements.
	The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities, with a funds credit provided for the use of this equity as a funding source.
	Net interest income, provision for credit losses and non-interest expense amounts are recorded in their respective segment to the extent that the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense. Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics.
	Net income amounts for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, average loan balances and average deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal and marketing.
	Income taxes are applied to each segment based on the effective tax rate for the geographic location of the segment. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.
	The following is a summary of selected operating segment information as of and for the three months ended March 31, 2014:
		Arizona			Nevada			California			Specialty Finance			Corporate & Other			Consolidated Company
		(dollars in millions)
	At March 31, 2014
	Assets:
	Cash, cash equivalents and investment securities	$	3.3		$	7		$	2.6		$	0.5		$	2,123.80		$	2,137.20
	Gross loans and deferred fees, net	2,032.30			1,723.80			1,663.10			1,621.20			68.2			7,108.60
	Less: allowance for credit losses	(29.7		)	(25.2		)	(24.3		)	(23.7		)	(1.0		)	(103.9		)
	Loans, net	2,002.60			1,698.60			1,638.80			1,597.50			67.2			7,004.70
	Other repossessed assets	11.9			21.9			0.3			—			22			56.1
	Goodwill and intangible assets, net	2.4			24.4			—			—			—			26.8
	Other assets	33.8			67.8			25.5			18			376.7			521.9
	Total assets	$	2,054.00		$	1,819.70		$	1,667.20		$	1,616.00		$	2,589.70		$	9,746.60
	Liabilities:
	Deposits	$	2,166.00		$	3,024.60		$	1,867.30		$	845.1		$	246		$	8,149.00
	Borrowings	—			—			—			—			342.8			342.8
	Other liabilities	21.7			48.3			9.8			20.4			259.8			360
	Total liabilities	2,187.70			3,072.90			1,877.10			865.5			848.6			8,851.80
	Allocated equity	219.4			207.9			178.7			123.2			165.6			894.8
	Liabilities and stockholders' equity	$	2,407.10		$	3,280.80		$	2,055.80		$	988.7		$	1,014.20		$	9,746.60
	Excess funds provided (used)	353.1			1,461.10			388.6			(627.3		)	(1,575.5		)	—
		(in thousands)
	Three Months Ended March 31, 2014:
	Net interest income (expense)	$	26,608		$	28,595		$	22,792		$	13,964		$	(1,182	)	$	90,777
	Provision for credit losses	1,558			(884		)	655			2,170			1			3,500
	Net interest income (expense) after provision for credit losses	25,050			29,479			22,137			11,794			(1,183		)	87,277
	Non-interest income	820			2,289			1,250			82			394			4,835
	Non-interest expense	(13,304		)	(15,236		)	(13,043		)	(6,508		)	(1,658		)	(49,749		)
	Income (loss) from continuing operations before income taxes	12,566			16,532			10,344			5,368			(2,447		)	42,363
	Income tax expense (benefit)	4,929			5,787			4,350			2,013			(6,455		)	10,624
	Income from continuing operations	7,637			10,745			5,994			3,355			4,008			31,739
	Loss from discontinued operations, net	—			—			—			—			(654		)	(654		)
	Net income	$	7,637		$	10,745		$	5,994		$	3,355		$	3,354		$	31,085

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Nature of Operation	'
	Nature of operation
	WAL, incorporated under the laws of the state of Nevada, is a bank holding company providing full service banking and related services to locally owned businesses, professional firms, real estate developers and investors, local non-profit organizations, high net worth individuals and other consumers through its wholly-owned subsidiary bank: WAB, doing business as ABA in Arizona, as FIB in Northern Nevada, as AAB throughout the U.S., as BON in Southern Nevada, and as TPB in California. In addition, the Company has two non-bank subsidiaries, WAEF, which offers equipment finance services nationwide, and LVSP, which holds and manages certain non-performing loans and OREO.
Basis of Presentation	'
	Basis of presentation
	The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the unaudited Consolidated Financial Statements.
Use of Estimates	'
	Use of estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions; and determination of the valuation allowance related to deferred tax assets. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the unaudited Consolidated Financial Statements during their preparation.
Principles of Consolidation	'
	Principles of consolidation
	On December 31, 2013, the Company consolidated its three bank subsidiaries under one bank charter, WAB. As the subsidiary bank mergers did not meet the definition of a business combination under the guidance of FASB ASC 805, Business Combinations, the entities were combined in a method similar to a pooling of interests.
	WAL has nine wholly-owned subsidiaries: WAB, WAEF, LVSP and six unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities.
	WAB has the following wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal loans and leases; BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and BW Nevada Holdings, LLC, which owns the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building.
	The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.
Reclassifications	'
	Reclassifications
	Certain amounts in the consolidated financial statements as of December 31, 2013 and for the three months ended March 31, 2013 have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.
Interim Financial Information	'
	Interim financial information
	The accompanying unaudited Consolidated Financial Statements as of and for the three months ended March 31, 2014 and 2013 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2013.
Investment Securities	'
	Investment securities
	Investment securities may be classified as HTM, AFS or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.
	Securities classified as AFS or trading are reported as an asset on the Consolidated Balance Sheets at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.
	Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security using the interest method. For mortgage-backed securities, estimates of prepayments are considered in the constant yield calculations.
	In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and it is not more likely than not the Company would be required to sell the security.
	Declines in the fair value of individual debt securities AFS that are deemed to be other than temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other than temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) market or other factors is recognized in other comprehensive income or loss. Credit loss is recorded if the present value of cash flows is less than amortized cost.
	For individual debt securities where the Company intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the securities cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.
Loans, Interest and Fees from Loans	'
	Loans, interest and fees from loans
	The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by unearned loan fees and allowance for credit losses. Purchased loans are recorded at estimated fair value on the date of purchase.
	The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected due, at least in part, to credit quality. Loans are evaluated individually to determine if there is credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not “carry over” or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For additional information, see "Note 3. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.
	Interest income on loans is accrued daily using the effective interest method and recognized over the terms of the loans. Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period.
	When loans are repaid, any remaining unamortized balances of unearned fees, deferred fees and costs and premiums and discounts paid on purchased loans are accounted for though interest income.
	Nonaccrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. Generally, the Company places loans in a nonaccrual status and ceases recognizing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest is unlikely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if they are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.
	For all loan types, when a loan is placed on nonaccrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed. Subsequent payments received from the customer are applied to principal and no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. The Company occasionally recognizes income on a cash basis for non-accrual loans in which the collection of the remaining principal balance is not in doubt.
	Impaired loans: A loan is identified as impaired when it is probable that interest and principal will not be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as nonaccrual. However, in certain instances, impaired loans may continue on an accrual basis, such as loans classified as impaired due to doubt regarding collectability according to contractual terms, that are both fully secured by collateral and are current in their interest and principal payments. Impaired loans are measured for reserve requirements in accordance with FASB ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are charged against the allowance for credit losses. In addition to our own internal loan review process, the FDIC may from time to time direct the Company to modify loan grades, loan impairment calculations or loan impairment methodology.
	Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, extensions, deferrals, renewals and rewrites. A TDR loan is also considered impaired. Generally, a loan that is modified at an effective market rate of interest may no longer be disclosed as a TDR in years subsequent to the restructuring if it is performing based on the terms specified by the restructuring agreement.
Allowance for Credit Losses	'
	Allowance for credit losses
	Credit risk is inherent in the business of extending loans and leases to borrowers. Like other financial institutions, the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses charged to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.
	The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include our historical loss experience, delinquency and charge-off trends, collateral values, changes in the level of nonperforming loans and other factors. Qualitative factors include the economic condition of our operating markets and the state of certain industries. Specific changes in the risk factors are based on actual loss experience, as well as perceived risk of similar groups of loans classified by collateral type, purpose and term. An internal five-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona and California, which, in some cases, have declined substantially from their peak. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, the FDIC and state bank regulatory agency, as an integral part of their examination processes, periodically review the bank's allowances for credit losses, and may require us to make additions to our allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.
	The allowance consists of specific and general components. The specific allowance relates to impaired loans. In general, impaired loans include those where interest recognition has been suspended, loans that are more than 90 days delinquent but because of adequate collateral coverage, income continues to be recognized, and other criticized and classified loans not paying substantially according to the original contract terms. For such loans, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan are lower than the carrying value of that loan, pursuant to FASB ASC 310, Receivables. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The amount to which the present value falls short of the current loan obligation will be set up as a reserve for that account or charged-off.
	The Company uses an appraised value method to determine the need for a reserve on impaired, collateral dependent loans and further discounts the appraisal for disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months.
	The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.
Off-Balance Sheet Instruments	'
	Off-balance sheet instruments
	In the ordinary course of business, the Company has entered into off-balance sheet financial instruments consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the consolidated financial statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the consolidated balance sheets. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.
	As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included within other liabilities and the charge to income that establishes this liability is included in non-interest expense.
Other Assets Acquired Through Foreclosure	'
	Other assets acquired through foreclosure
	Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value, less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.
Business Combinations	'
	Business combinations
	Business combinations are accounted for under the acquisition method of accounting in accordance with FASB ASC 805, Business Combinations. Under the acquisition method the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of earnings from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.
Derivative Financial Instruments	'
	Derivative financial instruments
	The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).
	The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheets at their fair value in accordance with FASB ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.
	For a fair value hedge, the change in the fair value of the derivative instrument is recognized in non-interest income in the Consolidated Income Statement. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.
	The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value on the Consolidated Balance Sheets, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.
	Derivative instruments that are not designated as hedges per the accounting guidance are reported in the Consolidated Balance Sheets at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.
	The Company occasionally purchases a financial instrument or originates a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that 1) the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract, and 2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where 1) the host contract is measured at fair value, with changes in fair value reported in current earnings, or 2) the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried on the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.
Income Taxes	'
	Income taxes
	The Company and its subsidiaries, other than BW Real Estate, Inc., file a consolidated federal tax return. Due to tax regulations, several items of income and expense are recognized in different periods for tax return purposes than for financial reporting purposes. These items represent temporary differences. Deferred taxes are provided on an asset and liability method, whereby deferred tax assets are recognized for deductible temporary differences and tax credit carryovers and deferred tax liabilities are recognized for taxable temporary differences. A temporary difference is the difference between the reported amount of an asset or liability and its tax basis. A deferred tax asset is reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effect of changes in tax laws and rates on the date of enactment.
Fair Values of Financial Instruments	'
	Fair values of financial instruments
	The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820 establishes a framework for measuring fair value, establishes a three-level valuation hierarchy for disclosure of fair value measurement and enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income and/or cost approaches. FASB ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:
	•	Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.
	•	Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.
	•	Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models and similar techniques.
	The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.
	Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability, rather than an entity-specific measure. When market assumptions are available, FASB ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.
	FASB ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.
	Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at March 31, 2014 and December 31, 2013. The estimated fair value amounts for March 31, 2014 and December 31, 2013 have been measured as of period-end, and have not been reevaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at the period-end.
	The information in "Note 11. Fair Value Accounting" in these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.
	Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.
	The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:
	Cash and cash equivalents
	The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.
	Money market and certificates of deposit investments
	The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.
	Investment securities
	The fair values of U.S. Treasuries, corporate debt securities, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.
	The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.
	The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company has estimated the future cash flows and discount rate using third party quotes adjusted based on assumptions regarding the adjustments a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.
	Restricted stock
	WAB is a member of the FHLB system and maintains an investment in capital stock of the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its FHLB stock to determine if any impairment exists. The fair values have been categorized as Level 2 in the fair value hierarchy.
	Loans
	Fair value for loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality with adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans disclosed in "Note 11. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements is categorized as Level 2 in the fair value hierarchy, excluding impaired loans that are categorized as Level 3.
	Accrued interest receivable and payable
	The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value. Accrued interest receivable and payable fair value measurements are classified as Level 3 in the fair value hierarchy.
	Derivative financial instruments
	All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.
	Deposits
	The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities disclosed in "Note 11. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements is categorized as Level 2 in the fair value hierarchy.
	Federal Home Loan Bank advances and other borrowings
	The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. The other borrowings have been categorized as Level 3 in the fair value hierarchy.
	Junior subordinated debt
	Junior subordinated debt and subordinated debt are valued by comparing interest rates and spreads to an index relative to the ten year treasury rate and discounting the contractual cash flows on the Company's debt using these market rates. The junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.
	Off-balance sheet instruments
	Fair values for the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) are based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing.
Recent Accounting Pronouncements	'
	Recent accounting pronouncements
	In February 2013, the FASB issued guidance within ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date. The amendments in ASU 2013-04 to Topic 405, Liabilities, provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of the Update is fixed at the reporting date, except for obligations addressed with existing GAAP. The guidance requires an entity to measure those obligations as the sum of the amount the reporting entity agreed to pay on behalf of its co-obligors. The guidance also requires an entity to disclose the nature and amount of the obligation, as well as other information about those obligations. The amendment is effective retrospectively for reporting periods beginning after December 15, 2013. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
	In July 2013, the FASB issued guidance within ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The amendments in ASU 2013-11 to Topic 740, Income Taxes, provide guidance on the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
	In January 2014, the FASB issued guidance within ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The amendments in ASU 2014-01 to Topic 323, Equity Investments and Joint Ventures, provide guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The amendments permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014 and should be applied retrospectively to all periods presented, with early adoption permitted. All of the Company's LIHTC investments are within the scope of this guidance and the Company has adopted this amended guidance beginning on January 1, 2014. As a result, prior period financial information has been adjusted to conform to the amended guidance. See "Note 10. Income Taxes" for the impact that adoption had on the Company's financial condition and results of operations as well as additional disclosures required under these amendments. The adoption of this amended guidance did not have a significant impact on the Company's cash flows.
	In January 2014, the FASB issued guidance within ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of the amendments in ASU 2014-04 to Topic 310, Receivables - Troubled Debt Restructurings by Creditors, is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor 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 amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014. An entity can elect to adopt the amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]	'
Carrying Amounts and Fair Values of Investment Securities	'
	Carrying amounts and fair values of investment securities at March 31, 2014 and December 31, 2013 are summarized as follows:
			31-Mar-14
	Held-to-maturity		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	Collateralized debt obligations		$	50	$	4,869		$	—		$	4,919
	Corporate debt securities		97,776		821			(3,156		)	95,441
	Municipal obligations		177,912		4,490			(1,279		)	181,123
	Total HTM securities		$	275,738	$	10,180		$	(4,435	)	$	281,483
	Available-for-sale		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	U.S. Government-sponsored agency securities		$	59,112	$	—		$	(1,440	)	$	57,672
	Municipal obligations		121,242		1,048			(3,412		)	118,878
	Preferred stock		75,902		1,313			(3,268		)	73,947
	Mutual funds		37,422		256			(435		)	37,243
	Residential MBS issued by GSEs		989,705		5,799			(8,097		)	987,407
	Commercial MBS issued by GSEs		2,088		—			(54		)	2,034
	Private label residential MBS		37,611		30			(2,026		)	35,615
	Private label commercial MBS		5,225		187			—			5,412
	Trust preferred securities		32,000		—			(7,272		)	24,728
	CRA investments		23,912		—			(415		)	23,497
	Total AFS securities		$	1,384,219	$	8,633		$	(26,419	)	$	1,366,433
	Securities measured at fair value
	Residential MBS issued by GSEs										$	2,460
	Private label residential MBS										483
	Total securities measured at fair value										$	2,943
			31-Dec-13
	Held-to-maturity		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	Collateralized debt obligations		$	50	$	1,346		$	—		$	1,396
	Corporate debt securities		97,777		775			(3,826		)	94,726
	Municipal obligations		183,579		2,773			(2,370		)	183,982
	CRA investments		1,600		—			—			1,600
	Total HTM securities		$	283,006	$	4,894		$	(6,196	)	$	281,704
	Available-for-sale		Amortized		Gross			Gross			Fair
			Cost		Unrealized Gains			Unrealized (Losses)			Value
			(in thousands)
	U.S. Government-sponsored agency securities		$	49,110	$	—		$	(2,135	)	$	46,975
	Municipal obligations		121,671		316			(6,322		)	115,665
	Preferred stock		68,110		853			(7,479		)	61,484
	Mutual funds		37,423		93			(984		)	36,532
	Residential MBS issued by GSEs		1,028,402		5,567			(12,548		)	1,021,421
	Private label residential MBS		38,250		—			(2,151		)	36,099
	Private label commercial MBS		5,252		181			—			5,433
	Trust preferred securities		32,000		—			(8,195		)	23,805
	CRA investments		23,830		—			(548		)	23,282
	Total AFS securities		$	1,404,048	$	7,010		$	(40,362	)	$	1,370,696
	Securities measured at fair value
	Residential MBS issued by GSEs										$	3,036
Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position	'
	Information pertaining to securities with gross unrealized losses at March 31, 2014 and December 31, 2013, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows:
			31-Mar-14
			Less Than Twelve Months					More Than Twelve Months					Total
			Gross		Fair			Gross			Fair		Gross		Fair
			Unrealized		Value			Unrealized			Value		Unrealized		Value
			Losses					Losses					Losses
			(in thousands)
	Held-to-maturity
	Corporate debt securities		$	—	$	—		$	3,156		$	71,844	$	3,156	$	71,844
	Municipal obligations		480		17,233			799			8,486		1,279		25,719
	Total HTM securities		$	480	$	17,233		$	3,955		$	80,330	$	4,435	$	97,563
	Available-for-sale
	U.S. government sponsored agency securities		$	298	$	40,117		$	1,142		$	17,555	$	1,440	$	57,672
	Preferred stock		3,268		36,712			—			—		3,268		36,712
	Mutual funds		435		25,648			—			—		435		25,648
	Residential MBS issued by GSEs		7,247		489,288			850			13,788		8,097		503,076
	Commercial MBS issued by GSEs		54		2,034			—			—		54		2,034
	Municipal obligations		1,290		46,367			2,122			20,761		3,412		67,128
	Private label residential MBS		1,986		29,349			40			3,393		2,026		32,742
	Trust preferred securities		—		—			7,272			24,728		7,272		24,728
	CRA investments		415		23,442			—			—		415		23,442
	Total AFS securities		$	14,993	$	692,957		$	11,426		$	80,225	$	26,419	$	773,182
			31-Dec-13
			Less Than Twelve Months					Over Twelve Months					Total
			Gross		Fair			Gross			Fair		Gross		Fair
			Unrealized		Value			Unrealized			Value		Unrealized		Value
			Losses					Losses					Losses
			(in thousands)
	Held-to-maturity
	Corporate debt securities		$	163	$	9,837		$	3,663		$	71,337	$	3,826	$	81,174
	Municipal obligations		1,624		50,740			746			5,102		2,370		55,842
	Total HTM securities		$	1,787	$	60,577		$	4,409		$	76,439	$	6,196	$	137,016
	Available-for-sale
	U.S. government sponsored agency securities		$	2,135	$	46,976		$	—		$	—	$	2,135	$	46,976
	Preferred stock		7,479		44,637			—			—		7,479		44,637
	Mutual funds		984		30,101			—			—		984		30,101
	Residential MBS issued by GSEs		11,934		601,756			614			8,984		12,548		610,740
	Municipal obligations		3,545		72,300			2,777			17,923		6,322		90,223
	Private label residential MBS		2,009		32,517			142			3,583		2,151		36,100
	Trust preferred securities		—		—			8,195			23,807		8,195		23,807
	Other		548		23,823			—			—		548		23,823
	Total AFS securities		$	28,634	$	852,110		$	11,728		$	54,297	$	40,362	$	906,407
Amortized Cost and Fair Value of Investment Securities by Contractual Maturities	'
	The amortized cost and fair value of securities as of March 31, 2014, by contractual maturities, are shown below. The actual maturities of the MBS may differ from their contractual maturities because the loans underlying the securities may be repaid without any penalties due to borrowers that have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, these securities are listed separately in the maturity summary.
			31-Mar-14
			Amortized		Estimated
			Cost		Fair Value
			(in thousands)
	Held-to-Maturity
	Due in one year or less		$	3,608	$	3,673
	After one year through five years		17,596		18,191
	After five years through ten years		146,688		145,735
	After ten years		107,846		113,884
	Total HTM		$	275,738	$	281,483
	Available-for-Sale
	Due in one year or less		$	66,543	$	65,949
	After one year through five years		16,920		17,513
	After five years through ten years		64,404		63,021
	After ten years		201,723		189,482
	Mortgage backed securities		1,034,629		1,030,468
	Total AFS		$	1,384,219	$	1,366,433
Investment Securities by Credit Rating Type	'
	The following tables summarize the carrying amounts of the Company’s investment ratings position as March 31, 2014 and December 31, 2013:
			As of March 31, 2014
			AAA		Split-rated			AA+			A+ to A-		BBB+		BB+		Totals
					AAA/AA+			to AA-					to BBB-		and below
			(in thousands)
	Municipal obligations		$	7,928	$	—		$	131,355		$	150,004	$	7,288	$	215	$	296,790
	Residential MBS issued by GSEs		—		989,867			—			—		—		—		989,867
	Commercial MBS issued by GSEs		—		2,034			—			—		—		—		2,034
	Private label residential MBS		23,343		—			107			4,143		5,028		3,477		36,098
	Private label commercial MBS		5,412		—			—			—		—		—		5,412
	Mutual funds (3)		—		—			—			—		37,243		—		37,243
	U.S. government sponsored agency		—		57,672			—			—		—		—		57,672
	Preferred stock		—		—			—			—		46,452		19,385		65,837
	Trust preferred securities		—		—			—			—		24,728		—		24,728
	Collateralized debt obligations		—		—			—			—		—		50		50
	Corporate debt securities		—		—			2,698			25,098		69,980		—		97,776
	Total (1) (2)		$	36,683	$	1,049,573		$	134,160		$	179,245	$	190,719	$	23,127	$	1,613,507
	-1	The Company used the average credit rating of the combination of S&P, Moody’s and Fitch in the above table where ratings differed.
	-2	Securities values are shown at carrying value as of March 31, 2014. Unrated securities consist of CRA investments with a carrying value of $23.5 million and preferred stock with a carrying value of $8.1 million.
	-3	At least 80% of mutual funds are investment grade corporate debt securities.
			31-Dec-13
			AAA		Split-rated			AA+			A+ to A-		BBB+		BB+		Totals
					AAA/AA+			to AA-					to BBB-		and below
			(in thousands)
	Municipal obligations		$	7,965	$	—		$	129,810		$	153,949	$	7,305	$	215	$	299,244
	Residential MBS issued by GSEs		—		1,024,457			—			—		—		—		1,024,457
	Private label residential MBS		23,646		—			125			4,101		4,625		3,602		36,099
	Private label commercial MBS		5,433		—			—			—		—		—		5,433
	Mutual funds (3)		—		—			—			—		36,532		—		36,532
	U.S. government sponsored agency		—		46,975			—			—		—		—		46,975
	Preferred stock		—		—			—			—		45,847		13,244		59,091
	Trust preferred securities		—		—			—			—		23,805		—		23,805
	Collateralized debt obligations		—		—			—			—		—		50		50
	Corporate debt securities		—		—			2,697			35,102		59,978		—		97,777
	Total (1) (2)		$	37,044	$	1,071,432		$	132,632		$	193,152	$	178,092	$	17,111	$	1,629,463
	-1	The Company used the average credit rating of the combination of S&P, Moody’s and Fitch in the above table where ratings differed.
	-2	Securities values are shown at carrying value as of December 31, 2013. Unrated securities consist of CRA investments with a carrying value of $23.3 million, one ARPS with a carrying value of $2.4 million and an other investment of $1.6 million.
	-3	At least 80% of mutual funds are investment grade corporate debt securities.
Gross Gains and (Losses) on Sales of Investment Securities	'
	The following table presents gross gains and losses on sales of investment securities:
			Three Months Ended March 31,
			2014		2013
			(in thousands)
	Gross gains		$	366	$	200
	Gross losses		—		(53		)
	Net gains		$	366	$	147

Loans_Leases_and_Allowance_for1

Loans, Leases and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2014
Receivables [Abstract]	'
Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses	'
	The composition of the Company’s loan portfolio is as follows:
		March 31, 2014				December 31, 2013
		(in thousands)
	Commercial and industrial	$	2,501,499			$	2,236,740
	Commercial real estate - non-owner occupied	1,849,211				1,843,415
	Commercial real estate - owner occupied	1,606,243				1,561,862
	Construction and land development	553,655				537,231
	Residential real estate	344,859				350,312
	Commercial leases	221,916				235,968
	Consumer	38,330				45,153
	Deferred fees and costs	(7,114		)		(9,266		)
	Loans, net of deferred fees and costs	7,108,599				6,801,415
	Allowance for credit losses	(103,899		)		(100,050		)
	Total	$	7,004,700			$	6,701,365
Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs	'
	The following table presents the contractual aging of the recorded investment in past due loans by class of loans and excluding deferred fees and costs:
		31-Mar-14
		Current				30-59 Days				60-89 Days				Over 90 days				Total				Total
						Past Due				Past Due				Past Due				Past Due
		(in thousands)
	Commercial real estate
	Owner occupied	$	1,597,539			$	4,416			$	996			$	3,292			$	8,704			$	1,606,243
	Non-owner occupied	1,651,963				17,824				1,548				6,454				25,826				1,677,789
	Multi-family	171,422				—				—				—				—				171,422
	Commercial and industrial
	Commercial	2,499,734				651				216				898				1,765				2,501,499
	Leases	221,916				—				—				—				—				221,916
	Construction and land development
	Construction	310,599				479				—				—				479				311,078
	Land	241,234				—				—				1,343				1,343				242,577
	Residential real estate	330,550				2,764				4,286				7,259				14,309				344,859
	Consumer	37,882				270				11				167				448				38,330
	Total loans	$	7,062,839			$	26,404			$	7,057			$	19,413			$	52,874			$	7,115,713
		31-Dec-13
		Current				30-59 Days				60-89 Days				Over 90 days				Total				Total
						Past Due				Past Due				Past Due				Past Due
		(in thousands)
	Commercial real estate
	Owner occupied	$	1,555,210			$	1,759			$	406			$	4,487			$	6,652			$	1,561,862
	Non-owner occupied	1,627,062				8,774				4,847				15,767				29,388				1,656,450
	Multi-family	186,965				—				—				—				—				186,965
	Commercial and industrial
	Commercial	2,232,186				1,868				233				2,453				4,554				2,236,740
	Leases	235,618				—				—				350				350				235,968
	Construction and land development
	Construction	291,883				—				—				—				—				291,883
	Land	243,741				264				1,343				—				1,607				245,348
	Residential real estate	339,566				2,423				1,368				6,955				10,746				350,312
	Consumer	44,018				466				155				514				1,135				45,153
	Total loans	$	6,756,249			$	15,554			$	8,352			$	30,526			$	54,432			$	6,810,681
Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class	'
	The following table presents the recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing interest by class of loans:
		31-Mar-14																31-Dec-13
		Non-accrual loans												Loans past due 90 days or more and still accruing				Non-accrual loans									Loans past due 90 days or more and still accruing
		Current				Past Due/				Total								Current				Past Due/			Total
						Delinquent				Non-accrual												Delinquent			Non-accrual
		(in thousands)
	Commercial real estate
	Owner occupied	$	6,663			$	4,460			$	11,123			$	—			$	9,330			$	3,600		$	12,930	$	887
	Non-owner occupied	15,454				22,306				37,760				—				17,930				23,996			41,926		—
	Multi-family	—				—				—				—				—				—			—		—
	Commercial and industrial
	Commercial	1,534				1,104				2,638				—				622				2,682			3,304		125
	Leases	432				—				432				—				99				350			449		—
	Construction and land development
	Construction	—				—				—				—				—				—			—		—
	Land	2,277				1,341				3,618				—				3,133				1,392			4,525		—
	Residential real estate	2,751				12,051				14,802				—				5,067				7,413			12,480		47
	Consumer	28				—				28				167				27				39			66		475
	Total	$	29,139			$	41,262			$	70,401			$	167			$	36,208			$	39,472		$	75,680	$	1,534
Loans by Risk Rating	'
	The following tables present gross loans by risk rating:
		31-Mar-14
		Pass				Special Mention				Substandard				Doubtful				Loss				Total
		(in thousands)
	Commercial real estate
	Owner occupied	$	1,525,617			$	33,638			$	46,355			$	633			$	—			$	1,606,243
	Non-owner occupied	1,539,862				53,132				84,795				—				—				1,677,789
	Multi-family	170,948				—				474				—				—				171,422
	Commercial and industrial
	Commercial	2,474,755				9,249				17,495				—				—				2,501,499
	Leases	217,460				4,024				432				—				—				221,916
	Construction and land development
	Construction	310,599				479				—				—				—				311,078
	Land	208,513				13,509				20,555				—				—				242,577
	Residential real estate	317,513				3,044				24,302				—				—				344,859
	Consumer	37,515				339				476				—				—				38,330
	Total	$	6,802,782			$	117,414			$	194,884			$	633			$	—			$	7,115,713
		31-Mar-14
		Pass				Special Mention				Substandard				Doubtful				Loss				Total
		(in thousands)
	Current (up to 29 days past due)	$	6,800,191			$	115,223			$	146,792			$	633			$	—			$	7,062,839
	Past due 30 - 59 days	2,472				2,090				21,842				—				—				26,404
	Past due 60 - 89 days	119				101				6,837				—				—				7,057
	Past due 90 days or more	—				—				19,413				—				—				19,413
	Total	$	6,802,782			$	117,414			$	194,884			$	633			$	—			$	7,115,713
		31-Dec-13
		Pass				Special Mention				Substandard				Doubtful				Loss				Total
		(in thousands)
	Commercial real estate
	Owner occupied	$	1,483,190			$	33,065			$	44,649			$	958			$	—			$	1,561,862
	Non-owner occupied	1,498,500				64,588				93,362				—				—				1,656,450
	Multi-family	186,479				—				486				—				—				186,965
	Commercial and industrial
	Commercial	2,208,947				10,058				16,231				1,504				—				2,236,740
	Leases	231,344				4,175				449				—				—				235,968
	Construction and land development
	Construction	291,402				481				—				—				—				291,883
	Land	210,615				13,762				20,971				—				—				245,348
	Residential real estate	323,333				3,037				23,942				—				—				350,312
	Consumer	43,516				799				838				—				—				45,153
	Total	$	6,477,326			$	129,965			$	200,928			$	2,462			$	—			$	6,810,681
		31-Dec-13
		Pass				Special Mention				Substandard				Doubtful				Loss				Total
		(in thousands)
	Current (up to 29 days past due)	$	6,471,951			$	129,208			$	154,441			$	649			$	—			$	6,756,249
	Past due 30 - 59 days	4,205				602				10,747				—				—				15,554
	Past due 60 - 89 days	1,123				155				7,074				—				—				8,352
	Past due 90 days or more	47				—				28,666				1,813				—				30,526
	Total	$	6,477,326			$	129,965			$	200,928			$	2,462			$	—			$	6,810,681
Recorded Investment in Loans Classified as Impaired	'
	The table below reflects recorded investment in loans classified as impaired:
		March 31, 2014				December 31, 2013
		(in thousands)
	Impaired loans with a specific valuation allowance under FASB ASC 310	$	22,127			$	25,754
	Impaired loans without a specific valuation allowance under FASB ASC 310	149,135				152,623
	Total impaired loans	$	171,262			$	178,377
	Valuation allowance related to impaired loans	$	(3,925	)		$	(5,280	)
Impaired Loans by Loan Class	'
	The following table presents the impaired loans by class:
		March 31, 2014				December 31, 2013
		(in thousands)
	Commercial real estate
	Owner occupied	$	35,329			$	37,902
	Non-owner occupied	68,756				73,152
	Multi-family	—				—
	Commercial and industrial
	Commercial	15,233				449
	Leases	432				16,892
	Construction and land development
	Construction	—				—
	Land	22,012				23,069
	Residential real estate	29,026				26,376
	Consumer	474				537
	Total	$	171,262			$	178,377
Average Investment in Impaired Loans by Loan Class	'
	The following table presents average investment in impaired loans by loan class:
		Three Months Ended March 31,
		2014				2013
		(in thousands)
	Commercial real estate
	Owner occupied	$	36,748			$	60,065
	Non-owner occupied	70,039				52,986
	Multi-family	—				230
	Commercial and industrial
	Commercial	15,583				15,088
	Leases	439				1,028
	Construction and land development
	Construction	—				—
	Land	22,586				29,362
	Residential real estate	26,799				37,040
	Consumer	502				705
	Total	$	172,696			$	196,504
Interest Income on Impaired Loans by Loan Class	'
	The following table presents interest income on impaired loans by class:
		Three Months Ended March 31,
		2014				2013
		(in thousands)
	Commercial real estate
	Owner occupied	$	391			$	420
	Non-owner occupied	373				404
	Multi-family	—				—
	Commercial and industrial
	Commercial	193				150
	Leases	—				—
	Construction and land development
	Construction	—				—
	Land	261				259
	Residential real estate	157				5
	Consumer	11				8
	Total	$	1,386			$	1,246
Tabular Disclosure of Nonperforming Assets	'
	The following table summarizes nonperforming assets:
		March 31, 2014				December 31, 2013
		(in thousands)
	Nonaccrual loans	$	70,401			$	75,680
	Loans past due 90 days or more on accrual status	167				1,534
	Troubled debt restructured loans	89,524				89,576
	Total nonperforming loans	160,092				166,790
	Other assets acquired through foreclosure, net	56,450				66,719
	Total nonperforming assets	$	216,542			$	233,509
Schedule of Changes in Accretable Yield	'
	Changes in the accretable yield for loans acquired with deteriorated credit quality are as follows:
		Three Months Ended March 31,
		2014				2013
		(in thousands)
	Balance, at beginning of period	$	28,164			$	7,072
	Reclassification from non-accretable to accretable yield	1,466				—
	Accretion to interest income	(2,404		)		(2,079		)
	Reversal of fair value adjustments upon disposition of loans	(395		)		—
	Balance, at end of period	$	26,831			$	4,993
Allowances for Credit Losses	'
	The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment:
		Commercial				Commercial				Commercial				Residential				Construction				Commercial			Consumer		Total
		Real Estate-				Real Estate-				and				Real				and Land				Leases					Loans
		Owner				Non-Owner				Industrial				Estate				Development
		Occupied				Occupied
		(in thousands)
	Loans as of March 31, 2014:
	Recorded Investment:
	Impaired loans with an allowance recorded	$	1,462			$	13,503			$	940			$	6,111			$	—			$	83		$	28	$	22,127
	Impaired loans with no allowance recorded	33,867				55,253				14,293				22,915				22,012				349			446		149,135
	Total loans individually evaluated for impairment	35,329				68,756				15,233				29,026				22,012				432			474		171,262
	Loans collectively evaluated for impairment	1,548,059				1,691,360				2,486,004				313,376				531,615				221,484			37,856		6,829,754
	Loans acquired with deteriorated credit quality	22,855				89,095				262				2,457				28				—			—		114,697
	Total loans	$	1,606,243			$	1,849,211			$	2,501,499			$	344,859			$	553,655			$	221,916		$	38,330	$	7,115,713
	Unpaid Principal Balance
	Impaired loans with an allowance recorded	$	1,462			$	13,503			$	1,153			$	6,260			$	—			$	83		$	28	$	22,489
	Impaired loans with no allowance recorded	39,398				58,050				14,859				28,567				23,117				501			459		164,951
	Total loans individually evaluated for impairment	40,860				71,553				16,012				34,827				23,117				584			487		187,440
	Loans collectively evaluated for impairment	1,548,059				1,691,360				2,486,004				313,376				531,615				221,484			37,856		6,829,754
	Loans acquired with deteriorated credit quality	30,841				120,728				870				3,709				100				—			—		156,248
	Total loans	$	1,619,760			$	1,883,641			$	2,502,886			$	351,912			$	554,832			$	222,068		$	38,343	$	7,173,442
	Related Allowance for Credit Losses
	Impaired loans with an allowance recorded	$	450			$	803			$	666			$	1,938			$	—			$	65		$	3	$	3,925
	Impaired loans with no allowance recorded	—				—				—				—				—				—			—		—
	Total loans individually evaluated for impairment	450				803				666				1,938				—				65			3		3,925
	Loans collectively evaluated for impairment	13,563				18,625				36,155				9,359				16,700				2,607			1,553		98,562
	Loans acquired with deteriorated credit quality	—				1,412				—				—				—				—			—		1,412
	Total loans	$	14,013			$	20,840			$	36,821			$	11,297			$	16,700			$	2,672		$	1,556	$	103,899
		Commercial				Commercial				Commercial				Residential				Construction				Commercial			Consumer		Total
		Real Estate-				Real Estate-				and				Real				and Land				Leases					Loans
		Owner				Non-Owner				Industrial				Estate				Development
		Occupied				Occupied
		(in thousands)
	Loans as of December 31, 2013:
	Recorded Investment:
	Impaired loans with an allowance recorded	$	1,092			$	17,932			$	1,907			$	4,580			$	118			$	99		$	26	$	25,754
	Impaired loans with no allowance recorded	36,810				55,220				14,985				21,796				22,951				350			511		152,623
	Total loans individually evaluated for impairment	37,902				73,152				16,892				26,376				23,069				449			537		178,377
	Loans collectively evaluated for impairment	1,500,740				1,678,242				2,219,500				321,683				513,681				235,519			44,616		6,513,981
	Loans acquired with deteriorated credit quality	23,220				92,021				348				2,253				481				—			—		118,323
	Total loans	$	1,561,862			$	1,843,415			$	2,236,740			$	350,312			$	537,231			$	235,968		$	45,153	$	6,810,681
	Unpaid Principal Balance
	Impaired loans with an allowance recorded	$	1,092			$	19,273			$	2,120			$	4,729			$	118			$	99		$	27	$	27,458
	Impaired loans with no allowance recorded	43,537				58,322				15,731				27,550				24,137				502			523		170,302
	Total loans individually evaluated for impairment	44,629				77,595				17,851				32,279				24,255				601			550		197,760
	Loans collectively evaluated for impairment	1,500,740				1,678,242				2,219,500				321,683				513,681				235,519			44,616		6,513,981
	Loans acquired with deteriorated credit quality	34,951				130,279				1,403				3,728				804				—			—		171,165
	Total loans	$	1,580,320			$	1,886,116			$	2,238,754			$	357,690			$	538,740			$	236,120		$	45,166	$	6,882,906
	Related Allowance for Credit Losses
	Impaired loans with an allowance recorded	$	402			$	2,121			$	702			$	1,896			$	85			$	70		$	4	$	5,280
	Impaired loans with no allowance recorded	—				—				—				—				—				—			—		—
	Total loans individually evaluated for impairment	402				2,121				702				1,896				85				70			4		5,280
	Loans collectively evaluated for impairment	12,158				17,061				36,344				9,744				14,434				2,541			2,166		94,448
	Loans acquired with deteriorated credit quality	—				322				—				—				—				—			—		322
	Total loans	$	12,560			$	19,504			$	37,046			$	11,640			$	14,519			$	2,611		$	2,170	$	100,050
	The following table summarizes the changes in the allowance for credit losses by portfolio type:
		Three Months Ended March 31,
		Construction and Land Development				Commercial				Residential				Commercial				Consumer				Total
						Real Estate				Real Estate				and Industrial
		(in thousands)
	2014
	Beginning Balance	$	14,519			$	32,064			$	11,640			$	39,657			$	2,170			$	100,050
	Charge-offs	—				(171		)		(406		)		(1,478		)		(12		)		(2,067		)
Recoveries	211				560				553				922				170				2,416
Provision	1,970				2,400				(490		)		392				(772		)		3,500
Ending balance	$	16,700			$	34,853			$	11,297			$	39,493			$	1,556			$	103,899
2013
Beginning Balance	$	10,554			$	34,982			$	15,237			$	32,860			$	1,794			$	95,427
Charge-offs	(614		)		(2,887		)		(2,493		)		(1,770		)		(275		)		(8,039		)
Recoveries	701				942				569				441				14				2,667
Provision	398				1,864				1,282				2,654				(759		)		5,439
Ending balance	$	11,039			$	34,901			$	14,595			$	34,185			$	774			$	95,494
Troubled Debt Restructured Loans by Loan Class	'
	The following table presents information on the financial effects of TDR loans by class for the periods presented:
		Three Months Ended March 31, 2014
		Number			Pre-Modification				Forgiven				Lost				Post-Modification				Waived Fees
		of Loans			Outstanding				Principal				Interest				Outstanding				and Other
					Recorded Investment				Balance				Income				Recorded Investment				Expenses
		(dollars in thousands)
	Commercial real estate
	Owner occupied	1			$	798			$	378			$	117			$	303			$	33
	Non-owner occupied	—			—				—				—				—				—
	Multi-family	—			—				—				—				—				—
	Commercial and industrial
	Commercial	1			63				—				—				63				3
	Leases	—			—				—				—				—				—
	Construction and land development
	Construction	—			—				—				—				—				—
	Land	—			—				—				—				—				—
	Residential real estate	1			405				166				37				202				—
	Consumer	—			—				—				—				—				—
	Total	3			$	1,266			$	544			$	154			$	568			$	36
		Three Months Ended March 31, 2013
		Number			Pre-Modification				Forgiven				Lost				Post-Modification				Waived Fees
		of Loans			Outstanding				Principal				Interest				Outstanding				and Other
					Recorded Investment				Balance				Income				Recorded Investment				Expenses
		(dollars in thousands)
	Commercial real estate
	Owner occupied	5			$	2,686			$	—			$	54			$	2,632			$	—
	Non-owner occupied	4			10,318				1,030				63				9,225				7
	Multi-family	—			—				—				—				—				—
	Commercial and industrial
	Commercial	5			1,846				—				10				1,836				8
	Leases	—			—				—				—				—				—
	Construction and land development
	Construction	—			—				—				—				—				—
	Land	2			286				—				—				286				1
	Residential real estate	1			40				—				6				34				3
	Consumer	1			39				—				—				39				3
	Total	18			$	15,215			$	1,030			$	133			$	14,052			$	22
Troubled Debt Restructured Loans by Class for Which There was a Payment Default	'
	The following table presents TDR loans by class for which there was a payment default during the period:
		Three Months Ended March 31,
		2014							2013
		Number			Recorded				Number			Recorded
		of Loans			Investment				of Loans			Investment
		(dollars in thousands)
	Commercial real estate
	Owner occupied	1			$	303			3			$	2,506
	Non-owner occupied	—			—				1			160
	Multi-family	—			—				—			—
	Commercial and industrial
	Commercial	1			63				2			782
	Leases	—			—				—			—
	Construction and land development
	Construction	—			—				—			—
	Land	—			—				2			330
	Residential real estate	1			202				2			655
	Consumer	—			—				—			—
	Total	3			$	568			10			$	4,433

Other_Assets_Acquired_Through_1

Other Assets Acquired Through Foreclosure (Tables)	3 Months Ended
	Mar. 31, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'
Changes in Other Assets Acquired Through Foreclosure	'
	The following table represents the changes in other assets acquired through foreclosure:
			Three Months Ended March 31,
			2014
			Gross Balance			Valuation Allowance			Net Balance
			(in thousands)
	Balance, beginning of the period		$	88,421		$	(21,702	)	$	66,719
	Transfers to other assets acquired through foreclosure, net		2,110			—			2,110
	Proceeds from sale of other real estate owned and repossessed assets, net		(19,473		)	5,961			(13,512		)
	Valuation adjustments, net		—			(35		)	(35		)
	Gains, net (1)		1,168			—			1,168
	Balance, end of period		$	72,226		$	(15,776	)	$	56,450
			2013
	Balance, beginning of the period		$	113,474		$	(36,227	)	$	77,247
	Transfers to other assets acquired through foreclosure, net		6,609			—			6,609
	Proceeds from sale of other real estate owned and repossessed assets, net		(12,120		)	6,747			(5,373		)
	Valuation adjustments, net		—			(1,017		)	(1,017		)
	Gains, net (1)		455			—			455
	Balance, end of period		$	108,418		$	(30,497	)	$	77,921
	-1	Includes gains related to initial transfers to other assets of zero and $0.3 million during the three months ended March 31, 2014 and 2013, respectively, pursuant to accounting guidance.

Other_Borrowings_Tables

Other Borrowings (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Company's Borrowings	'
	The following table summarizes the Company’s borrowings as of March 31, 2014 and December 31, 2013:
		March 31, 2014		December 31, 2013
		(in thousands)
	Short-Term:
	Revolving line of credit	$	5,000	$	3,000
	FHLB advances	56,324		25,906
	Total short-term borrowings	$	61,324	$	28,906
	Long-Term:
	FHLB advances	$	217,166	$	247,973
	Other long term debt	64,326		64,217
	Total long-term borrowings	$	281,492	$	312,190

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit	'
	A summary of the contractual amounts for unfunded commitments and letters of credit are as follows:
		March 31, 2014		December 31, 2013
		(in thousands)
	Commitments to extend credit, including unsecured loan commitments of $221,669 at March 31, 2014 and $237,063 at December 31, 2013	$	1,840,740	$	1,878,340
	Credit card commitments and financial guarantees	33,932		33,632
	Standby letters of credit, including unsecured letters of credit of $5,957 at March 31, 2014 and $4,896 at December 31, 2013	38,501		31,271
	Total	$	1,913,173	$	1,943,243

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Summary of Changes in Accumulated Other Comprehensive Income	'
	The following table summarizes the changes in accumulated other comprehensive loss by component, net of tax, for the periods indicated:
		Three Months Ended March 31,
		2014									2013
		Unrealized			Impairment loss on securities			Total			Unrealized			Unrealized gain on cash flow hedge			Total
		holding gains									holding gains
		(losses) on AFS securities									(losses) on AFS securities
		(in thousands)
	Beginning balance	$	(21,690	)	$	144		$	(21,546	)	$	8,209		$	17		$	8,226
	Other comprehensive income (loss) before reclassifications	10,644			—			10,644			(890		)	(34		)	(924		)
	Amounts reclassified from accumulated other comprehensive loss	(229		)	—			(229		)	(97		)	—			(97		)
	Net current-period other comprehensive income (loss)	10,415			—			10,415			(987		)	(34		)	(1,021		)
	Ending balance	$	(11,275	)	$	144		$	(11,131	)	$	7,222		$	(17	)	$	7,205
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income	'
	The following table presents reclassifications out of accumulated other comprehensive loss:
		Amount reclassified from accumulated other comprehensive income
	Details about accumulated other	Three Months Ended March 31,						Affected line item in the statement
	comprehensive loss components	2014			2013			where net income is presented
		(in thousands)
	Unrealized gains and losses on AFS
		$	366		$	147		Gain on sales of investment securities, net
		(137		)	(50		)	Income tax expense
		$	229		$	97		Net of tax

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Calculation of basic and diluted earnings per share	'
	The following table presents the calculation of basic and diluted earnings per share for the three months ended March 31, 2014 and 2013.
		Three Months Ended March 31,
		2014		2013
		(in thousands, except per share amounts)
	Weighted average shares - basic	86,256		85,324
	Dilutive effect of stock awards	867		656
	Weighted average shares - diluted	87,123		85,980
	Net income available to common shareholders	$	30,732	$	20,532
	Earnings per share - basic	0.35		0.24
	Earnings per share - diluted	0.35		0.24

Income_Taxes_Tables

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Impact of change in accounting principle on consolidated financial statements	'
	The following table summarizes the impact of the change in the Consolidated Financial Statements for the periods indicated:
		December 31, 2013
		(in thousands)
	Consolidated Balance Sheet:
	Deferred tax assets, net
	As previously reported	$	79,374
	As reported under new guidance	80,688
	Other assets
	As previously reported (1)	186,288
	As reported under new guidance	185,221
	Stockholders' Equity
	As previously reported	855,251
	As reported under new guidance	855,498
	-1	Includes a $14.6 million reclassification from premises and equipment, net.
		Three Months Ended
		March 31, 2013
		(in thousands)
	Consolidated Income Statement:
	Non-interest income
	As previously reported	$	3,899
	As reported under new guidance	4,799
	Income tax expense
	As previously reported	6,808
	As reported under new guidance	7,787
	Income from continuing operations
	As previously reported	20,926
	As reported under new guidance	20,847
	Net income
	As previously reported	20,964
	As reported under new guidance	20,885
	Net income available to common shareholders
	As previously reported	20,611
	As reported under new guidance	20,532
	Earnings per share applicable to common shareholders--basic
	As previously reported	0.24
	As reported under new guidance	0.24
	Earnings per share applicable to common shareholders--diluted
	As previously reported	0.24
	As reported under new guidance	0.24

Fair_Value_Accounting_Tables

Fair Value Accounting (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations	'
	For the three months ended March 31, 2014 and 2013, gains and losses from fair value changes included in the Consolidated Income Statements were as follows:
			Changes in Fair Values for Items Measured at Fair Value Pursuant to Election of the Fair Value Option
	Description		Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net				Interest Income on Securities			Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings
			(in thousands)
	Three Months Ended March 31, 2014
	Securities measured at fair value		$	18			$	1		$	—		$	19
	Junior subordinated debt		(978		)		—			(421		)	(1,399		)
	Total		$	(960	)		$	1		$	(421	)	$	(1,380	)
	Three Months Ended March 31, 2013
	Securities measured at fair value		$	(2	)		$	2		$	—		$	—
	Junior subordinated debt		(469		)		—			(466		)	(935		)
	Total		$	(471	)		$	2		$	(466	)	$	(935	)
Gains and Losses from Fair Value Changes on Securities Measured at Fair Value	'
	The following table presents the portion of trading securities losses related to trading securities still held at the reporting date:
			March 31,
			2014				2013
			(in thousands)
	Net gains and (losses) for the period on trading securities included in earnings		$	18			$	(2	)
	Less: net gains and (losses) recognized during the period on trading securities sold during the period		—				—
	Change in unrealized gains or (losses) for the period included in earnings for trading securities held at the end of the reporting period		$	18			$	(2	)
Fair Value of Assets and Liabilities	'
	The fair value of assets and liabilities measured at fair value on a recurring basis were determined using the following inputs at the periods presented:
			Fair Value Measurements at the End of the Reporting Period Using:
			Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs			Significant Unobservable Inputs			Fair Value
			(Level 1)				(Level 2)			(Level 3)
			(in thousands)
	31-Mar-14
	Assets:
	Measured at fair value
	Residential MBS issued by GSEs		$	—			$	2,460		$	—		$	2,460
	Private label residential MBS		—				483			—			483
	Total securities measured at fair value		$	—			$	2,943		$	—		$	2,943
	Available-for-sale
	U.S. government sponsored agency securities		$	—			$	57,672		$	—		$	57,672
	Municipal obligations		—				118,878			—			118,878
	Preferred stock		73,947				—			—			73,947
	Mutual funds		37,243				—			—			37,243
	Residential MBS issued by GSEs		—				987,407			—			987,407
	Commercial MBS issued by GSEs		—				2,034			—			2,034
	Private label residential MBS		—				35,615			—			35,615
	Private label commercial MBS		—				5,412			—			5,412
	Trust preferred		—				24,728			—			24,728
	CRA Investments		23,497				—			—			23,497
	Total AFS		$	134,687			$	1,231,746		$	—		$	1,366,433
	Positive NPVs on interest rate swaps		$	—			$	14,650		$	—		$	14,650
	Liabilities:
	Junior subordinated debt		$	—			$	—		$	42,836		$	42,836
	Negative NPVs on interest rate swaps		$	—			$	15,553		$	—		$	15,553
			Fair Value Measurements at the End of the Reporting Period Using:
			Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs			Significant Unobservable Inputs			Fair Value
			(Level 1)				(Level 2)			(Level 3)
			(in thousands)
	31-Dec-13
	Assets:
	Measured at fair value
	Residential MBS issued by GSEs		$	—			$	3,036		$	—		$	3,036
	Available-for-sale
	U.S. government sponsored agency securities		$	—			$	46,975		$	—		$	46,975
	Municipal obligations		—				115,665			—			115,665
	Preferred stock		61,484				—			—			61,484
	Mutual funds		36,532				—			—			36,532
	Residential MBS issued by GSEs		—				1,021,421			—			1,021,421
	Private label residential MBS		—				36,099			—			36,099
	Private label commercial MBS		—				5,433			—			5,433
	Trust preferred		—				23,805			—			23,805
	CRA Investments		23,282				—			—			23,282
	Total AFS		$	121,298			$	1,249,398		$	—		$	1,370,696
	Positive NPVs on interest rate swaps		$	—			$	2,783		$	—		$	2,783
	Liabilities:
	Junior subordinated debt		$	—			$	—		$	41,858		$	41,858
	Negative NPVs on interest rate swaps		$	—			$	4,168		$	—		$	4,168
Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis	'
	For the three months ended March 31, 2014 and 2013, the change in Level 3 liabilities measured at fair value on a recurring basis was as follows:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Junior Subordinated Debt
		Three Months Ended March 31,
		2014				2013
		(in thousands)
	Opening balance	$	(41,858	)		$	(36,218	)
	Total losses for the period
	Included in earnings (and changes in net assets) (a)	(978		)		(469		)
	Closing balance	$	(42,836	)		$	(36,687	)
	Change in unrealized losses for the three month period included in earnings (and changes in net assets)	$	(978	)		$	(469	)
	(a)	Total losses for the period are included in the non-interest income line, unrealized losses on assets / liabilities measured at fair value, net.
	For Level 3 liabilities measured at fair value on a recurring basis as of March 31, 2014 and December 31, 2013, the significant unobservable inputs used in the fair value measurements were as follows:
			Fair Value at				Valuation Technique		Significant Unobservable Inputs	Input Value
			March 31, 2014
			(dollars in thousands)
	Junior subordinated debt		$	42,836			Discounted cash flow		BB Corporate Bond over Treasury Index with comparable credit spread	5.692	%
			Fair Value at				Valuation Technique		Significant Unobservable Inputs	Input Value
			December 31, 2013
			(dollars in thousands)
	Junior subordinated debt		$	41,858			Discounted cash flow		BB Corporate Bond over Treasury Index with comparable credit spread	5.861	%
Assets Measured at Fair Value on Nonrecurring Basis	'
	The following table presents such assets carried on the balance sheet by caption and by level within the FASB ASC 825 hierarchy:
			Fair Value Measurements at the End of the Reporting Period Using
			Total				Quoted Prices in Active Markets for Identical Assets			Active Markets for Similar Assets			Unobservable Inputs
							(Level 1)			(Level 2)			(Level 3)
			(in thousands)
	As of March 31, 2014:
	Impaired loans with specific valuation allowance		$	18,202			$	—		$	—		$	18,202
	Impaired loans without specific valuation allowance		91,925				—			—			91,925
	Other assets acquired through foreclosure		56,450				—			—			56,450
	31-Dec-13
	Impaired loans with specific valuation allowance		$	20,474			$	—		$	—		$	20,474
	Impaired loans without specific valuation allowance		95,695				—			—			95,695
	Other assets acquired through foreclosure		66,719				—			—			66,719
Debt Security Credit Losses Recognized in Other Comprehensive Income/Earnings	'
	The following table presents a rollforward of the amount related to impairment credit losses recognized in earnings for the three months ended March 31, 2014 and 2013:
		Private Label Mortgage- Backed Securities
		Three Months Ended
		2014				2013
		(in thousands)
	Beginning balance of impairment losses held in other comprehensive income	$	—			$	(1,811	)
	Current period OTTI credit losses recognized through earnings	—				—
	Reductions for securities sold during the period	—				—
	Additions or reductions in credit losses due to change of intent to sell	—				—
	Reductions for increases in cash flows to be collected on impaired securities	—				—
	Ending balance of net unrealized losses held in other comprehensive income	$	—			$	(1,811	)
Estimated Fair Value of Financial Instruments	'
	The estimated fair value of the Company’s financial instruments is as follows:
			31-Mar-14
			Carrying Amount				Fair Value
							Level 1			Level 2			Level 3			Total
			(in thousands)
	Financial assets:
	Investment securities:
	HTM		$	275,738			$	10,781		$	270,694		$	8		$	281,483
	AFS		1,366,433				134,687			1,231,746			—			1,366,433
	Trading		2,943				—			2,943			—			2,943
	Positive NPVs on interest rate swaps		14,650				—			14,650			—			14,650
	Loans, net		7,004,700				—			6,358,264			110,127			6,468,391
	Financial liabilities:
	Deposits		8,148,973				—			8,152,956			—			8,152,956
	Customer repurchases		57,407				—			57,407			—			57,407
	Securities sold short		109,793				109,793			—			—			109,793
	FHLB and FRB advances		273,490				—			273,490			—			273,490
	Other borrowed funds		69,326				5,000			—			71,683			76,683
	Junior subordinated debt		42,836				—			—			42,836			42,836
	Negative NPVs on interest rate swaps		15,553				—			15,553			—			15,553
			31-Dec-13
			Carrying Amount				Fair Value
							Level 1			Level 2			Level 3			Total
			(in thousands)
	Financial assets:
	Investment securities:
	HTM		$	283,006			$	22,200		$	259,496		$	8		$	281,704
	AFS		1,370,696				121,298			1,249,398			—			1,370,696
	Trading		3,036				—			3,036			—			3,036
	Positive NPVs on interest rate swaps		2,783				—			2,783			—			2,783
	Loans, net		6,701,365				—			6,090,962			116,169			6,207,131
	Financial liabilities:
	Deposits		7,838,205				—			7,842,014			—			7,842,014
	Customer repurchases		71,192				—			71,192			—			71,192
	FHLB and FRB advances		273,879				—			273,879			—			273,879
	Other borrowed funds		67,217				3,000			—			71,475			74,475
	Junior subordinated debt		41,858				—			—			41,858			41,858
	Negative NPVs on interest rate swaps		4,168				—			4,168			—			4,168

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Summary of Operating Results of Discontinued Operations	'
	The following table summarizes the operating results of the discontinued operations for the periods indicated:
		Three Months Ended March 31,
		2014			2013
		(in thousands)
	Operating revenue	$	(144	)	$	1,139
	Non-interest expenses	(858		)	(1,074		)
	(Loss) income before income taxes	(1,002		)	65
	Income tax (benefit) expense	(348		)	27
	Net (loss) income	$	(654	)	$	38

Segments_Tables

Segments (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Operating Segment Information	'
	The following is a summary of selected operating segment information as of and for the three months ended March 31, 2014:
		Arizona			Nevada			California			Specialty Finance			Corporate & Other			Consolidated Company
		(dollars in millions)
	At March 31, 2014
	Assets:
	Cash, cash equivalents and investment securities	$	3.3		$	7		$	2.6		$	0.5		$	2,123.80		$	2,137.20
	Gross loans and deferred fees, net	2,032.30			1,723.80			1,663.10			1,621.20			68.2			7,108.60
	Less: allowance for credit losses	(29.7		)	(25.2		)	(24.3		)	(23.7		)	(1.0		)	(103.9		)
	Loans, net	2,002.60			1,698.60			1,638.80			1,597.50			67.2			7,004.70
	Other repossessed assets	11.9			21.9			0.3			—			22			56.1
	Goodwill and intangible assets, net	2.4			24.4			—			—			—			26.8
	Other assets	33.8			67.8			25.5			18			376.7			521.9
	Total assets	$	2,054.00		$	1,819.70		$	1,667.20		$	1,616.00		$	2,589.70		$	9,746.60
	Liabilities:
	Deposits	$	2,166.00		$	3,024.60		$	1,867.30		$	845.1		$	246		$	8,149.00
	Borrowings	—			—			—			—			342.8			342.8
	Other liabilities	21.7			48.3			9.8			20.4			259.8			360
	Total liabilities	2,187.70			3,072.90			1,877.10			865.5			848.6			8,851.80
	Allocated equity	219.4			207.9			178.7			123.2			165.6			894.8
	Liabilities and stockholders' equity	$	2,407.10		$	3,280.80		$	2,055.80		$	988.7		$	1,014.20		$	9,746.60
	Excess funds provided (used)	353.1			1,461.10			388.6			(627.3		)	(1,575.5		)	—
		(in thousands)
	Three Months Ended March 31, 2014:
	Net interest income (expense)	$	26,608		$	28,595		$	22,792		$	13,964		$	(1,182	)	$	90,777
	Provision for credit losses	1,558			(884		)	655			2,170			1			3,500
	Net interest income (expense) after provision for credit losses	25,050			29,479			22,137			11,794			(1,183		)	87,277
	Non-interest income	820			2,289			1,250			82			394			4,835
	Non-interest expense	(13,304		)	(15,236		)	(13,043		)	(6,508		)	(1,658		)	(49,749		)
	Income (loss) from continuing operations before income taxes	12,566			16,532			10,344			5,368			(2,447		)	42,363
	Income tax expense (benefit)	4,929			5,787			4,350			2,013			(6,455		)	10,624
	Income from continuing operations	7,637			10,745			5,994			3,355			4,008			31,739
	Loss from discontinued operations, net	—			—			—			—			(654		)	(654		)
	Net income	$	7,637		$	10,745		$	5,994		$	3,355		$	3,354		$	31,085

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
	Subsidiary	Wholly Owned Subsidiary Banks [Member]	Maximum
		Subsidiary
Significant Of Accounting Policies [Line Items]	'	'	'
Number Of Wholly Owned Subsidiaries Non Bank Subsidiaries	2	'	'
Number of wholly-owned subsidiaries	9	3	'
Number Of Unconsolidated Subsidiaries	6	'	'
Maximum period of internal loss allowance calculation model	'5 years	'	'
Period of collateral valuation analysis	'	'	'12 months

Investment_Securities_Carrying

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities held-to-maturity , Amortized Cost	$275,738	$283,006	'	'
Securities held-to-maturity , Gross Unrealized Gains	10,180	4,894	'	'
Securities held-to-maturity , Gross Unrealized (Losses)	-4,435	-6,196	'	'
Securities held to maturity Total, Estimated Fair Value	281,483	281,704	'	'
Securities available-for-sale, Amortized Cost	1,384,219	1,404,048	'	'
Securities available-for-sale, Gross Unrealized Gains	8,633	7,010	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-26,419	-40,362	'	'
Securities available for sale Total, Estimated Fair Value	1,366,433	1,370,696	'	'
Securities measured at fair value	2,943	'	'	'
Securities available-for-sale, OTTI Recognized in Other Comprehensive Loss	0	0	-1,811	-1,811
Collateralized debt obligations [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities held-to-maturity , Amortized Cost	50	50	'	'
Securities held-to-maturity , Gross Unrealized Gains	4,869	1,346	'	'
Securities held-to-maturity , Gross Unrealized (Losses)	0	0	'	'
Securities held to maturity Total, Estimated Fair Value	4,919	1,396	'	'
Corporate debt securities [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities held-to-maturity , Amortized Cost	97,776	97,777	'	'
Securities held-to-maturity , Gross Unrealized Gains	821	775	'	'
Securities held-to-maturity , Gross Unrealized (Losses)	-3,156	-3,826	'	'
Securities held to maturity Total, Estimated Fair Value	95,441	94,726	'	'
Municipal obligations [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities held-to-maturity , Amortized Cost	177,912	183,579	'	'
Securities held-to-maturity , Gross Unrealized Gains	4,490	2,773	'	'
Securities held-to-maturity , Gross Unrealized (Losses)	-1,279	-2,370	'	'
Securities held to maturity Total, Estimated Fair Value	181,123	183,982	'	'
Securities available-for-sale, Amortized Cost	121,242	121,671	'	'
Securities available-for-sale, Gross Unrealized Gains	1,048	316	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-3,412	-6,322	'	'
Securities available for sale Total, Estimated Fair Value	118,878	115,665	'	'
U.S. Government-sponsored agency securities [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	59,112	49,110	'	'
Securities available-for-sale, Gross Unrealized Gains	0	0	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-1,440	-2,135	'	'
Securities available for sale Total, Estimated Fair Value	57,672	46,975	'	'
Preferred Stock [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	75,902	68,110	'	'
Securities available-for-sale, Gross Unrealized Gains	1,313	853	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-3,268	-7,479	'	'
Securities available for sale Total, Estimated Fair Value	73,947	61,484	'	'
Mutual funds [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	37,422	37,423	'	'
Securities available-for-sale, Gross Unrealized Gains	256	93	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-435	-984	'	'
Securities available for sale Total, Estimated Fair Value	37,243	36,532	'	'
Residential MBS issued by GSEs [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	989,705	1,028,402	'	'
Securities available-for-sale, Gross Unrealized Gains	5,799	5,567	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-8,097	-12,548	'	'
Securities available for sale Total, Estimated Fair Value	987,407	1,021,421	'	'
Securities measured at fair value	2,460	3,036	'	'
Commercial MBS issued by GSEs [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	2,088	'	'	'
Securities available-for-sale, Gross Unrealized Gains	0	'	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-54	'	'	'
Securities available for sale Total, Estimated Fair Value	2,034	'	'	'
Private label residential MBS [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	37,611	38,250	'	'
Securities available-for-sale, Gross Unrealized Gains	30	0	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-2,026	-2,151	'	'
Securities available for sale Total, Estimated Fair Value	35,615	36,099	'	'
Securities measured at fair value	483	'	'	'
Private label commercial MBS [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	5,225	5,252	'	'
Securities available-for-sale, Gross Unrealized Gains	187	181	'	'
Securities available-for-sale, Gross Unrealized (Losses)	0	0	'	'
Securities available for sale Total, Estimated Fair Value	5,412	5,433	'	'
Trust preferred securities [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities available-for-sale, Amortized Cost	32,000	32,000	'	'
Securities available-for-sale, Gross Unrealized Gains	0	0	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-7,272	-8,195	'	'
Securities available for sale Total, Estimated Fair Value	24,728	23,805	'	'
CRA investments [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Securities held-to-maturity , Amortized Cost	'	1,600	'	'
Securities held-to-maturity , Gross Unrealized Gains	'	0	'	'
Securities held-to-maturity , Gross Unrealized (Losses)	'	0	'	'
Securities held to maturity Total, Estimated Fair Value	'	1,600	'	'
Securities available-for-sale, Amortized Cost	23,912	23,830	'	'
Securities available-for-sale, Gross Unrealized Gains	0	0	'	'
Securities available-for-sale, Gross Unrealized (Losses)	-415	-548	'	'
Securities available for sale Total, Estimated Fair Value	$23,497	$23,282	'	'

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
	positions		positions
Investment Identifier [Line Items]	'	'	'
Amount of impairment losses reclassified out of accumulated other comprehensive income into earnings	$0	$0	'
Total number of securities in an unrealized loss position	192	'	252
Net unrealized loss on trust preferred securities	7,300,000	'	8,200,000
Gross unrealized loss on HTM securities	4,435,000	'	6,196,000
Securities with carrying amounts were pledged	739,200,000	'	662,500,000
Corporate debt securities [Member]	'	'	'
Investment Identifier [Line Items]	'	'	'
Gross unrealized loss on HTM securities	$3,156,000	'	$3,800,000

Investment_Securities_Unrealiz

Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities held-to-maturity , Less Than Twelve Months, Aggregate Losses	$480	$1,787
Securities held-to-maturity securities, Less Than Twelve Months, Fair Value	17,233	60,577
Securities held-to-maturity , Twelve Months or Longer, Aggregate Losses	3,955	4,409
Securities held-to-maturity , Twelve Months or Longer, Fair Value	80,330	76,439
Securities held-to-maturity , Continuous Unrealized Loss Position, Aggregate Losses, Total	4,435	6,196
Securities held-to-maturity , Continuous Unrealized Loss Position, Fair Value, Total	97,563	137,016
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	14,993	28,634
Available-for-sale securities, Less Than Twelve Months, Fair Value	692,957	852,110
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	11,426	11,728
Available-for-sale securities, Twelve Months or Longer, Fair Value	80,225	54,297
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	26,419	40,362
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	773,182	906,407
Corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities held-to-maturity , Less Than Twelve Months, Aggregate Losses	0	163
Securities held-to-maturity securities, Less Than Twelve Months, Fair Value	0	9,837
Securities held-to-maturity , Twelve Months or Longer, Aggregate Losses	3,156	3,663
Securities held-to-maturity , Twelve Months or Longer, Fair Value	71,844	71,337
Securities held-to-maturity , Continuous Unrealized Loss Position, Aggregate Losses, Total	3,156	3,826
Securities held-to-maturity , Continuous Unrealized Loss Position, Fair Value, Total	71,844	81,174
Municipal obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities held-to-maturity , Less Than Twelve Months, Aggregate Losses	480	1,624
Securities held-to-maturity securities, Less Than Twelve Months, Fair Value	17,233	50,740
Securities held-to-maturity , Twelve Months or Longer, Aggregate Losses	799	746
Securities held-to-maturity , Twelve Months or Longer, Fair Value	8,486	5,102
Securities held-to-maturity , Continuous Unrealized Loss Position, Aggregate Losses, Total	1,279	2,370
Securities held-to-maturity , Continuous Unrealized Loss Position, Fair Value, Total	25,719	55,842
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	1,290	3,545
Available-for-sale securities, Less Than Twelve Months, Fair Value	46,367	72,300
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	2,122	2,777
Available-for-sale securities, Twelve Months or Longer, Fair Value	20,761	17,923
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	3,412	6,322
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	67,128	90,223
U.S. Government-sponsored agency securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	298	2,135
Available-for-sale securities, Less Than Twelve Months, Fair Value	40,117	46,976
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	1,142	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	17,555	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	1,440	2,135
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	57,672	46,976
Preferred Stock [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	3,268	7,479
Available-for-sale securities, Less Than Twelve Months, Fair Value	36,712	44,637
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	3,268	7,479
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	36,712	44,637
Mutual funds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	435	984
Available-for-sale securities, Less Than Twelve Months, Fair Value	25,648	30,101
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	435	984
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	25,648	30,101
Residential MBS issued by GSEs [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	7,247	11,934
Available-for-sale securities, Less Than Twelve Months, Fair Value	489,288	601,756
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	850	614
Available-for-sale securities, Twelve Months or Longer, Fair Value	13,788	8,984
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	8,097	12,548
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	503,076	610,740
Commercial MBS issued by GSEs [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	54	'
Available-for-sale securities, Less Than Twelve Months, Fair Value	2,034	'
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0	'
Available-for-sale securities, Twelve Months or Longer, Fair Value	0	'
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	54	'
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	2,034	'
Private label residential MBS [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	1,986	2,009
Available-for-sale securities, Less Than Twelve Months, Fair Value	29,349	32,517
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	40	142
Available-for-sale securities, Twelve Months or Longer, Fair Value	3,393	3,583
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	2,026	2,151
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	32,742	36,100
Trust preferred securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0	0
Available-for-sale securities, Less Than Twelve Months, Fair Value	0	0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	7,272	8,195
Available-for-sale securities, Twelve Months or Longer, Fair Value	24,728	23,807
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	7,272	8,195
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	24,728	23,807
Other [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	415	548
Available-for-sale securities, Less Than Twelve Months, Fair Value	23,442	23,823
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	415	548
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	$23,442	$23,823

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Securities held to maturity, Due in one year or less, Amortized Cost	$3,608	'
Securities held to maturity, After one year through five years, Amortized Cost	17,596	'
Securities held to maturity, After five years through ten years, Amortized Cost	146,688	'
Securities held to maturity, After ten years, Amortized Cost	107,846	'
Securities held to maturity Total, Amortized Cost	275,738	283,006
Securities available for sale, Due in one year or less, Amortized Cost	66,543	'
Securities available for sale, After one year through five years, Amortized Cost	16,920	'
Securities available for sale, After five years through ten years, Amortized Cost	64,404	'
Securities available for sale, After ten years, Amortized Cost	201,723	'
Securities available for sale, Mortgage backed securities, Amortized Cost	1,034,629	'
Securities available for sale Total, Amortized Cost	1,384,219	'
Securities held to maturity, Due in one year or less, Estimated Fair Value	3,673	'
Securities held to maturity, After one year through five years, Estimated Fair Value	18,191	'
Securities held to maturity, After five years through ten years, Estimated Fair Value	145,735	'
Securities held to maturity, After ten years, Estimated Fair Value	113,884	'
Securities held to maturity Total, Estimated Fair Value	281,483	281,704
Securities available for sale, Due in one year or less, Estimated Fair Value	65,949	'
Securities available for sale, After one year through five years, Estimated Fair Value	17,513	'
Securities available for sale, After five years through ten years, Estimated Fair Value	63,021	'
Securities available for sale, After ten years, Estimated Fair Value	189,482	'
Securities available for sale, Mortgage backed securities, Estimated Fair Value	1,030,468	'
Securities available for sale Total, Estimated Fair Value	$1,366,433	$1,370,696

Investment_Securities_Investme

Investment Securities - Investment Securities by Credit Rating Type (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Rated Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	$1,613,507		$1,629,463	[1],[2]
Rated Securities [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	296,790		299,244
Rated Securities [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	989,867		1,024,457
Rated Securities [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	2,034		'
Rated Securities [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	36,098		36,099
Rated Securities [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	5,412		5,433
Rated Securities [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	37,243		36,532
Rated Securities [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	57,672		46,975
Rated Securities [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	65,837		59,091
Rated Securities [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	24,728		23,805
Rated Securities [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	50		50
Rated Securities [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	97,776		97,777
AAA [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	36,683		37,044	[1],[2]
AAA [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	7,928		7,965
AAA [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AAA [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		'
AAA [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	23,343		23,646
AAA [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	5,412		5,433
AAA [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0	[3]	0	[3]
AAA [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AAA [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AAA [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AAA [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AAA [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	1,049,573		1,071,432	[1],[2]
Split-rated AAA/AA+ [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	989,867		1,024,457
Split-rated AAA/AA+ [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	2,034		'
Split-rated AAA/AA+ [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0	[3]	0	[3]
Split-rated AAA/AA+ [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	57,672		46,975
Split-rated AAA/AA+ [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
Split-rated AAA/AA+ [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	134,160		132,632	[1],[2]
AA+ to AA- [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	131,355		129,810
AA+ to AA- [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		'
AA+ to AA- [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	107		125
AA+ to AA- [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0	[3]	0	[3]
AA+ to AA- [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
AA+ to AA- [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	2,698		2,697
A+ to A- [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	179,245		193,152	[1],[2]
A+ to A- [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	150,004		153,949
A+ to A- [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
A+ to A- [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		'
A+ to A- [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	4,143		4,101
A+ to A- [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
A+ to A- [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0	[3]	0	[3]
A+ to A- [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
A+ to A- [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
A+ to A- [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
A+ to A- [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
A+ to A- [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	25,098		35,102
BBB+ to BBB- [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	190,719		178,092	[1],[2]
BBB+ to BBB- [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	7,288		7,305
BBB+ to BBB- [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BBB+ to BBB- [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		'
BBB+ to BBB- [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	5,028		4,625
BBB+ to BBB- [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BBB+ to BBB- [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	37,243	[3]	36,532	[3]
BBB+ to BBB- [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BBB+ to BBB- [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	46,452		45,847
BBB+ to BBB- [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	24,728		23,805
BBB+ to BBB- [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BBB+ to BBB- [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	69,980		59,978
BB+ and below [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	23,127		17,111	[1],[2]
BB+ and below [Member] | Municipal obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	215		215
BB+ and below [Member] | Residential MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BB+ and below [Member] | Commercial MBS issued by GSEs [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		'
BB+ and below [Member] | Private label residential MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	3,477		3,602
BB+ and below [Member] | Private label commercial MBS [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BB+ and below [Member] | Mutual funds [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0	[3]	0	[3]
BB+ and below [Member] | U.S. Government-sponsored agency securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BB+ and below [Member] | Preferred Stock [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	19,385		13,244
BB+ and below [Member] | Trust preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	0		0
BB+ and below [Member] | Collateralized debt obligations [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	50		50
BB+ and below [Member] | Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Investment securities	$0		$0
[1]	Securities values are shown at carrying value as of December 31, 2013. Unrated securities consist of CRA investments with a carrying value of $23.3 million, one ARPS with a carrying value of $2.4 million and an other investment of $1.6 million.
[2]	The Company used the average credit rating of the combination of S&P, Moody’s and Fitch in the above table where ratings differed.
[3]	At least 80% of mutual funds are investment grade corporate debt securities.

Investment_Securities_Investme1

Investment Securities - Investment Securities by Credit Rating Type (Parenthetical) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Investment securities—AFS, at fair value; amortized cost of $1,384,219 at March 31, 2014 and $1,404,048 at December 31, 2013	$1,366,433,000	$1,370,696,000
ARPS with a carrying value	8,100,000	2,400,000
HTM	275,738,000	283,006,000
Minimum percentage of investment grade mutual funds	80.00%	80.00%
CRA investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Investment securities—AFS, at fair value; amortized cost of $1,384,219 at March 31, 2014 and $1,404,048 at December 31, 2013	23,497,000	23,282,000
HTM	'	$1,600,000

Investment_Securities_Gross_Ga

Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'	'
Gross gains	$366	$200
Gross losses	0	-53
Net gains	$366	$147

Loans_Leases_and_Allowance_for2

Loans, Leases and Allowance for Credit Losses - Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	$7,115,713	$6,810,681
Deferred fees and costs	-7,114	-9,266
Loans, net of deferred loan fees and costs	7,108,599	6,801,415
Allowance for credit losses	-103,899	-100,050
Loans, net	7,004,700	6,701,365
Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	2,501,499	2,236,740
Commercial real estate - non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	1,849,211	1,843,415
Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	1,606,243	1,561,862
Allowance for credit losses	-14,013	-12,560
Construction and land development	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	553,655	537,231
Allowance for credit losses	-16,700	-14,519
Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	344,859	350,312
Allowance for credit losses	-11,297	-11,640
Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	221,916	235,968
Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Held for investment, without deferred fees	38,330	45,153
Allowance for credit losses	($1,556)	($2,170)

Loans_Leases_and_Allowance_for3

Loans, Leases and Allowance for Credit Losses - Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	$7,062,839	$6,756,249
30-59 Days Past Due	26,404	15,554
60-89 Days Past Due	7,057	8,352
Over 90 days Past Due	19,413	30,526
Total Past Due	52,874	54,432
Total	7,115,713	6,810,681
Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,597,539	1,555,210
30-59 Days Past Due	4,416	1,759
60-89 Days Past Due	996	406
Over 90 days Past Due	3,292	4,487
Total Past Due	8,704	6,652
Total	1,606,243	1,561,862
Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,651,963	1,627,062
30-59 Days Past Due	17,824	8,774
60-89 Days Past Due	1,548	4,847
Over 90 days Past Due	6,454	15,767
Total Past Due	25,826	29,388
Total	1,677,789	1,656,450
Commercial real estate | Multi-family	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	171,422	186,965
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 days Past Due	0	0
Total Past Due	0	0
Total	171,422	186,965
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	2,499,734	2,232,186
30-59 Days Past Due	651	1,868
60-89 Days Past Due	216	233
Over 90 days Past Due	898	2,453
Total Past Due	1,765	4,554
Total	2,501,499	2,236,740
Commercial and industrial | Commercial leases	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	221,916	235,618
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Over 90 days Past Due	0	350
Total Past Due	0	350
Total	221,916	235,968
Construction and land development | Construction	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	310,599	291,883
30-59 Days Past Due	479	0
60-89 Days Past Due	0	0
Over 90 days Past Due	0	0
Total Past Due	479	0
Total	311,078	291,883
Construction and land development | Land	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	241,234	243,741
30-59 Days Past Due	0	264
60-89 Days Past Due	0	1,343
Over 90 days Past Due	1,343	0
Total Past Due	1,343	1,607
Total	242,577	245,348
Residential real estate	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	330,550	339,566
30-59 Days Past Due	2,764	2,423
60-89 Days Past Due	4,286	1,368
Over 90 days Past Due	7,259	6,955
Total Past Due	14,309	10,746
Total	344,859	350,312
Consumer	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	37,882	44,018
30-59 Days Past Due	270	466
60-89 Days Past Due	11	155
Over 90 days Past Due	167	514
Total Past Due	448	1,135
Total	$38,330	$45,153

Loans_Leases_and_Allowance_for4

Loans, Leases and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	$7,062,839	$6,756,249
Past Due/ Delinquent	52,874	54,432
Total Non-accrual	70,401	75,680
Loans past due 90 days or more and still accruing	167	1,534
Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	29,139	36,208
Past Due/ Delinquent	41,262	39,472
Total Non-accrual	'	75,680
Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,597,539	1,555,210
Past Due/ Delinquent	8,704	6,652
Loans past due 90 days or more and still accruing	0	887
Commercial real estate | Commercial real estate - owner occupied | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	6,663	9,330
Past Due/ Delinquent	4,460	3,600
Total Non-accrual	11,123	12,930
Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,651,963	1,627,062
Past Due/ Delinquent	25,826	29,388
Loans past due 90 days or more and still accruing	0	0
Commercial real estate | Non-owner occupied | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	15,454	17,930
Past Due/ Delinquent	22,306	23,996
Total Non-accrual	37,760	41,926
Commercial real estate | Multi-family	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	171,422	186,965
Past Due/ Delinquent	0	0
Loans past due 90 days or more and still accruing	0	0
Commercial real estate | Multi-family | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	0	0
Past Due/ Delinquent	0	0
Total Non-accrual	0	0
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	2,499,734	2,232,186
Past Due/ Delinquent	1,765	4,554
Loans past due 90 days or more and still accruing	0	125
Commercial and industrial | Commercial and industrial | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,534	622
Past Due/ Delinquent	1,104	2,682
Total Non-accrual	2,638	3,304
Commercial and industrial | Commercial leases	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	221,916	235,618
Past Due/ Delinquent	0	350
Loans past due 90 days or more and still accruing	0	0
Commercial and industrial | Commercial leases | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	432	99
Past Due/ Delinquent	0	350
Total Non-accrual	432	449
Construction and land development | Construction	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	310,599	291,883
Past Due/ Delinquent	479	0
Loans past due 90 days or more and still accruing	0	0
Construction and land development | Construction | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	0	0
Past Due/ Delinquent	0	0
Total Non-accrual	0	0
Construction and land development | Land	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	241,234	243,741
Past Due/ Delinquent	1,343	1,607
Loans past due 90 days or more and still accruing	0	0
Construction and land development | Land | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	2,277	3,133
Past Due/ Delinquent	1,341	1,392
Total Non-accrual	3,618	4,525
Residential real estate	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	330,550	339,566
Past Due/ Delinquent	14,309	10,746
Loans past due 90 days or more and still accruing	0	47
Residential real estate | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	2,751	5,067
Past Due/ Delinquent	12,051	7,413
Total Non-accrual	14,802	12,480
Consumer	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	37,882	44,018
Past Due/ Delinquent	448	1,135
Loans past due 90 days or more and still accruing	167	475
Consumer | Non-accrual loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	28	27
Past Due/ Delinquent	0	39
Total Non-accrual	$28	$66

Loans_Leases_and_Allowance_for5

Loans, Leases and Allowance for Credit Losses - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
			TDR loans [Member]	TDR loans [Member]
Leases [Line Items]	'	'	'	'
Reduction in interest income due to nonaccrual loans	$1	$1.20	'	'
Minimum Period Of Internal Loss Allowance Calculation Model	'1 year	'	'	'
Maximum Period Of Internal Loss Allowance Calculation Model	'5 years	'	'	'
Loan commitments outstanding	'	'	0	0
Loan purchases	$15.60	$43	'	'

Loans_Leases_and_Allowance_for6

Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Current	$7,062,839	$6,756,249
Past due 30-59 days	26,404	15,554
Past due 60-89 days	7,057	8,352
Past due 90 days or more	19,413	30,526
Total	7,115,713	6,810,681
Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	344,859	350,312
Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	38,330	45,153
Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	1,606,243	1,561,862
Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	1,677,789	1,656,450
Commercial real estate | Multi-family	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	171,422	186,965
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	2,501,499	2,236,740
Commercial and industrial | Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	221,916	235,968
Construction and land development | Construction	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	311,078	291,883
Construction and land development | Land	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	242,577	245,348
Pass	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Current	6,800,191	6,471,951
Past due 30-59 days	2,472	4,205
Past due 60-89 days	119	1,123
Past due 90 days or more	0	47
Total	6,802,782	6,477,326
Pass | Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	317,513	323,333
Pass | Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	37,515	43,516
Pass | Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	1,525,617	1,483,190
Pass | Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	1,539,862	1,498,500
Pass | Commercial real estate | Multi-family	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	170,948	186,479
Pass | Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	2,474,755	2,208,947
Pass | Commercial and industrial | Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	217,460	231,344
Pass | Construction and land development | Construction	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	310,599	291,402
Pass | Construction and land development | Land	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	208,513	210,615
Special Mention	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Current	115,223	129,208
Past due 30-59 days	2,090	602
Past due 60-89 days	101	155
Past due 90 days or more	0	0
Total	117,414	129,965
Special Mention | Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	3,044	3,037
Special Mention | Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	339	799
Special Mention | Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	33,638	33,065
Special Mention | Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	53,132	64,588
Special Mention | Commercial real estate | Multi-family	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Special Mention | Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	9,249	10,058
Special Mention | Commercial and industrial | Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	4,024	4,175
Special Mention | Construction and land development | Construction	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	479	481
Special Mention | Construction and land development | Land	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	13,509	13,762
Substandard	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Current	146,792	154,441
Past due 30-59 days	21,842	10,747
Past due 60-89 days	6,837	7,074
Past due 90 days or more	19,413	28,666
Total	194,884	200,928
Substandard | Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	24,302	23,942
Substandard | Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	476	838
Substandard | Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	46,355	44,649
Substandard | Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	84,795	93,362
Substandard | Commercial real estate | Multi-family	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	474	486
Substandard | Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	17,495	16,231
Substandard | Commercial and industrial | Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	432	449
Substandard | Construction and land development | Construction	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Substandard | Construction and land development | Land	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	20,555	20,971
Doubtful	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Current	633	649
Past due 30-59 days	0	0
Past due 60-89 days	0	0
Past due 90 days or more	0	1,813
Total	633	2,462
Doubtful | Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Doubtful | Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Doubtful | Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	633	958
Doubtful | Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Doubtful | Commercial real estate | Multi-family	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Doubtful | Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	1,504
Doubtful | Commercial and industrial | Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Doubtful | Construction and land development | Construction	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Doubtful | Construction and land development | Land	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Current	0	0
Past due 30-59 days	0	0
Past due 60-89 days	0	0
Past due 90 days or more	0	0
Total	0	0
Loss | Residential real estate	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Consumer	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Commercial real estate | Multi-family	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Commercial and industrial | Commercial leases	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Construction and land development | Construction	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	0	0
Loss | Construction and land development | Land	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Total	$0	$0

Loans_Leases_and_Allowance_for7

Loans, Leases and Allowance for Credit Losses - Recorded Investment in Loans Classified as Impaired (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Impaired loans with an allowance recorded	$22,127	$25,754
Impaired loans with no allowance recorded	149,135	152,623
Total impaired loans	171,262	178,377
Valuation allowance related to impaired loans	($3,925)	($5,280)

Loans_Leases_and_Allowance_for8

Loans, Leases and Allowance for Credit Losses - Impaired Loans by Loan Class (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	$171,262	$178,377
Residential real estate	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	29,026	26,376
Consumer	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	474	537
Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	35,329	37,902
Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	68,756	73,152
Commercial real estate | Multi-family	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	0	0
Commercial and industrial	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	15,233	16,892
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	15,233	449
Commercial and industrial | Commercial leases	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	432	16,892
Construction and land development | Construction	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	0	0
Construction and land development | Land	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total impaired loans by class	$22,012	$23,069

Loans_Leases_and_Allowance_for9

Loans, Leases and Allowance for Credit Losses - Average Investment in Impaired Loans by Loan Class (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	$172,696	$196,504
Residential real estate	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	26,799	37,040
Consumer	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	502	705
Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	36,748	60,065
Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	70,039	52,986
Commercial real estate | Multi-family	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	0	230
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	15,583	15,088
Commercial and industrial | Commercial leases	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	439	1,028
Construction and land development | Construction	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	0	0
Construction and land development | Land	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total average investment in impaired loans by loan class	$22,586	$29,362

Recovered_Sheet1

Loans, Leases and Allowance for Credit Losses - Interest Income on Impaired Loans by Loan Class (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	$1,386	$1,246
Residential real estate	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	157	5
Consumer	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	11	8
Commercial real estate | Commercial real estate - owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	391	420
Commercial real estate | Non-owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	373	404
Commercial real estate | Multi-family	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	0	0
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	193	150
Commercial and industrial | Commercial leases	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	0	0
Construction and land development | Construction	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	0	0
Construction and land development | Land	'	'
Financing Receivable, Impaired [Line Items]	'	'
Total interest income on impaired loans by class	$261	$259

Recovered_Sheet2

Loans, Leases and Allowance for Credit Losses - Tabular Disclosure of Nonperforming Assets (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Nonaccrual loans	$70,401	$75,680	'	'
Loans past due 90 days or more on accrual status	167	1,534	'	'
Troubled debt restructured loans	89,524	89,576	'	'
Total nonperforming loans	160,092	166,790	'	'
Other assets acquired through foreclosure, net	56,450	66,719	77,921	77,247
Total nonperforming assets	$216,542	$233,509	'	'

Recovered_Sheet3

Loans, Leases and Allowance for Credit Losses - Changes in Accretable Discount for Loans Purchased with Credit Quality Deterioration (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Balance at beginning of period	$28,164	$7,072
Reclassification from non-accretable to accretable yield	1,466	0
Accretion to interest income	-2,404	-2,079
Reversal of fair value adjustments upon disposition of loans	-395	0
Balance at end of period	$26,831	$4,993

Recovered_Sheet4

Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Valuation Allowance [Line Items]	'	'
Beginning Balance	$100,050	$95,427
Charge-offs	-2,067	-8,039
Recoveries	2,416	2,667
Provision for credit losses	3,500	5,439
Ending balance	103,899	95,494
Construction and land development	'	'
Valuation Allowance [Line Items]	'	'
Beginning Balance	14,519	10,554
Charge-offs	0	-614
Recoveries	211	701
Provision for credit losses	1,970	398
Ending balance	16,700	11,039
Commercial real estate	'	'
Valuation Allowance [Line Items]	'	'
Beginning Balance	32,064	34,982
Charge-offs	-171	-2,887
Recoveries	560	942
Provision for credit losses	2,400	1,864
Ending balance	34,853	34,901
Residential real estate	'	'
Valuation Allowance [Line Items]	'	'
Beginning Balance	11,640	15,237
Charge-offs	-406	-2,493
Recoveries	553	569
Provision for credit losses	-490	1,282
Ending balance	11,297	14,595
Commercial and industrial	'	'
Valuation Allowance [Line Items]	'	'
Beginning Balance	39,657	32,860
Charge-offs	-1,478	-1,770
Recoveries	922	441
Provision for credit losses	392	2,654
Ending balance	39,493	34,185
Consumer	'	'
Valuation Allowance [Line Items]	'	'
Beginning Balance	2,170	1,794
Charge-offs	-12	-275
Recoveries	170	14
Provision for credit losses	-772	-759
Ending balance	$1,556	$774

Recovered_Sheet5

Loans, Leases and Allowance for Credit Losses - Summary of Impairment Method Information Related to Loans and Allowance for Credit Losses (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	$22,127	$25,754
Impaired loans with no allowance recorded	149,135	152,623
Total loans individually evaluated for impairment	171,262	178,377
Loans collectively evaluated for impairment	6,829,754	6,513,981
Loans acquired with deteriorated credit quality	114,697	118,323
Total loans	7,115,713	6,810,681
Impaired loans with an allowance recorded	22,489	27,458
Impaired loans with no allowance recorded	164,951	170,302
Total loans individually evaluated for impairment	187,440	197,760
Loans collectively evaluated for impairment	6,829,754	6,513,981
Loans acquired with deteriorated credit quality	156,248	171,165
Total loans	7,173,442	6,882,906
Impaired loans with an allowance recorded	3,925	5,280
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	3,925	5,280
Loans collectively evaluated for impairment	98,562	94,448
Loans acquired with deteriorated credit quality	1,412	322
Total loans held for investment	103,899	100,050
Commercial real estate - owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	1,462	1,092
Impaired loans with no allowance recorded	33,867	36,810
Total loans individually evaluated for impairment	35,329	37,902
Loans collectively evaluated for impairment	1,548,059	1,500,740
Loans acquired with deteriorated credit quality	22,855	23,220
Total loans	1,606,243	1,561,862
Impaired loans with an allowance recorded	1,462	1,092
Impaired loans with no allowance recorded	39,398	43,537
Total loans individually evaluated for impairment	40,860	44,629
Loans collectively evaluated for impairment	1,548,059	1,500,740
Loans acquired with deteriorated credit quality	30,841	34,951
Total loans	1,619,760	1,580,320
Impaired loans with an allowance recorded	450	402
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	450	402
Loans collectively evaluated for impairment	13,563	12,158
Loans acquired with deteriorated credit quality	0	0
Total loans held for investment	14,013	12,560
Non-owner occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	13,503	17,932
Impaired loans with no allowance recorded	55,253	55,220
Total loans individually evaluated for impairment	68,756	73,152
Loans collectively evaluated for impairment	1,691,360	1,678,242
Loans acquired with deteriorated credit quality	89,095	92,021
Total loans	1,849,211	1,843,415
Impaired loans with an allowance recorded	13,503	19,273
Impaired loans with no allowance recorded	58,050	58,322
Total loans individually evaluated for impairment	71,553	77,595
Loans collectively evaluated for impairment	1,691,360	1,678,242
Loans acquired with deteriorated credit quality	120,728	130,279
Total loans	1,883,641	1,886,116
Impaired loans with an allowance recorded	803	2,121
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	803	2,121
Loans collectively evaluated for impairment	18,625	17,061
Loans acquired with deteriorated credit quality	1,412	322
Total loans held for investment	20,840	19,504
Commercial and industrial	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	940	1,907
Impaired loans with no allowance recorded	14,293	14,985
Total loans individually evaluated for impairment	15,233	16,892
Loans collectively evaluated for impairment	2,486,004	2,219,500
Loans acquired with deteriorated credit quality	262	348
Total loans	2,501,499	2,236,740
Impaired loans with an allowance recorded	1,153	2,120
Impaired loans with no allowance recorded	14,859	15,731
Total loans individually evaluated for impairment	16,012	17,851
Loans collectively evaluated for impairment	2,486,004	2,219,500
Loans acquired with deteriorated credit quality	870	1,403
Total loans	2,502,886	2,238,754
Impaired loans with an allowance recorded	666	702
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	666	702
Loans collectively evaluated for impairment	36,155	36,344
Loans acquired with deteriorated credit quality	0	0
Total loans held for investment	36,821	37,046
Residential real estate	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	6,111	4,580
Impaired loans with no allowance recorded	22,915	21,796
Total loans individually evaluated for impairment	29,026	26,376
Loans collectively evaluated for impairment	313,376	321,683
Loans acquired with deteriorated credit quality	2,457	2,253
Total loans	344,859	350,312
Impaired loans with an allowance recorded	6,260	4,729
Impaired loans with no allowance recorded	28,567	27,550
Total loans individually evaluated for impairment	34,827	32,279
Loans collectively evaluated for impairment	313,376	321,683
Loans acquired with deteriorated credit quality	3,709	3,728
Total loans	351,912	357,690
Impaired loans with an allowance recorded	1,938	1,896
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	1,938	1,896
Loans collectively evaluated for impairment	9,359	9,744
Loans acquired with deteriorated credit quality	0	0
Total loans held for investment	11,297	11,640
Construction and land development	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	0	118
Impaired loans with no allowance recorded	22,012	22,951
Total loans individually evaluated for impairment	22,012	23,069
Loans collectively evaluated for impairment	531,615	513,681
Loans acquired with deteriorated credit quality	28	481
Total loans	553,655	537,231
Impaired loans with an allowance recorded	0	118
Impaired loans with no allowance recorded	23,117	24,137
Total loans individually evaluated for impairment	23,117	24,255
Loans collectively evaluated for impairment	531,615	513,681
Loans acquired with deteriorated credit quality	100	804
Total loans	554,832	538,740
Impaired loans with an allowance recorded	0	85
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	0	85
Loans collectively evaluated for impairment	16,700	14,434
Loans acquired with deteriorated credit quality	0	0
Total loans held for investment	16,700	14,519
Commercial leases [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	83	99
Impaired loans with no allowance recorded	349	350
Total loans individually evaluated for impairment	432	449
Loans collectively evaluated for impairment	221,484	235,519
Loans acquired with deteriorated credit quality	0	0
Total loans	221,916	235,968
Impaired loans with an allowance recorded	83	99
Impaired loans with no allowance recorded	501	502
Total loans individually evaluated for impairment	584	601
Loans collectively evaluated for impairment	221,484	235,519
Loans acquired with deteriorated credit quality	0	0
Total loans	222,068	236,120
Impaired loans with an allowance recorded	65	70
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	65	70
Loans collectively evaluated for impairment	2,607	2,541
Loans acquired with deteriorated credit quality	0	0
Total loans held for investment	2,672	2,611
Consumer	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired loans with an allowance recorded	28	26
Impaired loans with no allowance recorded	446	511
Total loans individually evaluated for impairment	474	537
Loans collectively evaluated for impairment	37,856	44,616
Loans acquired with deteriorated credit quality	0	0
Total loans	38,330	45,153
Impaired loans with an allowance recorded	28	27
Impaired loans with no allowance recorded	459	523
Total loans individually evaluated for impairment	487	550
Loans collectively evaluated for impairment	37,856	44,616
Loans acquired with deteriorated credit quality	0	0
Total loans	38,343	45,166
Impaired loans with an allowance recorded	3	4
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	3	4
Loans collectively evaluated for impairment	1,553	2,166
Loans acquired with deteriorated credit quality	0	0
Total loans held for investment	$1,556	$2,170

Recovered_Sheet6

Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructured Loans by Loan Class (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	3	18
Pre-Modification Outstanding Recorded Investment	$1,266	$15,215
Forgiven Principal Balance	544	1,030
Lost Interest Income	154	133
Post-Modification Outstanding Recorded Investment	568	14,052
Waived Fees and Other Expenses	36	22
Residential real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	1	1
Pre-Modification Outstanding Recorded Investment	405	40
Forgiven Principal Balance	166	0
Lost Interest Income	37	6
Post-Modification Outstanding Recorded Investment	202	34
Waived Fees and Other Expenses	0	3
Consumer	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	1
Pre-Modification Outstanding Recorded Investment	0	39
Forgiven Principal Balance	0	0
Lost Interest Income	0	0
Post-Modification Outstanding Recorded Investment	0	39
Waived Fees and Other Expenses	0	3
Commercial real estate - owner occupied | Commercial real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	1	5
Pre-Modification Outstanding Recorded Investment	798	2,686
Forgiven Principal Balance	378	0
Lost Interest Income	117	54
Post-Modification Outstanding Recorded Investment	303	2,632
Waived Fees and Other Expenses	33	0
Non-owner occupied | Commercial real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	4
Pre-Modification Outstanding Recorded Investment	0	10,318
Forgiven Principal Balance	0	1,030
Lost Interest Income	0	63
Post-Modification Outstanding Recorded Investment	0	9,225
Waived Fees and Other Expenses	0	7
Multi-family | Commercial real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Forgiven Principal Balance	0	0
Lost Interest Income	0	0
Post-Modification Outstanding Recorded Investment	0	0
Waived Fees and Other Expenses	0	0
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	1	5
Pre-Modification Outstanding Recorded Investment	63	1,846
Forgiven Principal Balance	0	0
Lost Interest Income	0	10
Post-Modification Outstanding Recorded Investment	63	1,836
Waived Fees and Other Expenses	3	8
Commercial leases | Commercial and industrial	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Forgiven Principal Balance	0	0
Lost Interest Income	0	0
Post-Modification Outstanding Recorded Investment	0	0
Waived Fees and Other Expenses	0	0
Construction | Construction and land development	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Forgiven Principal Balance	0	0
Lost Interest Income	0	0
Post-Modification Outstanding Recorded Investment	0	0
Waived Fees and Other Expenses	0	0
Land | Construction and land development	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	2
Pre-Modification Outstanding Recorded Investment	0	286
Forgiven Principal Balance	0	0
Lost Interest Income	0	0
Post-Modification Outstanding Recorded Investment	0	286
Waived Fees and Other Expenses	$0	$1

Recovered_Sheet7

Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructured Loans by Class for Which There was Payment Default (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	3	10
Recorded Investment	$568	$4,433
Residential real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	1	2
Recorded Investment	202	655
Consumer	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Recorded Investment	0	0
Commercial real estate - owner occupied | Commercial real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	1	3
Recorded Investment	303	2,506
Non-owner occupied | Commercial real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	1
Recorded Investment	0	160
Multi-family | Commercial real estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Recorded Investment	0	0
Commercial and industrial | Commercial and industrial	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	1	2
Recorded Investment	63	782
Commercial leases | Commercial and industrial	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Recorded Investment	0	0
Construction | Construction and land development	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	0
Recorded Investment	0	0
Land | Construction and land development	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Loans	0	2
Recorded Investment	$0	$330

Recovered_Sheet8

Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'		'
Balance, beginning of the period, Gross Balance	$88,421		$113,474
Transfers to other assets acquired through foreclosure, net, Gross Balance	2,110		6,609
Proceeds from sale of other real estate owned and repossessed assets, net, Gross Balance	-19,473		-12,120
Gains (losses), net, Gross Balance	1,168	[1]	455	[1]
Balance, end of period, Gross Balance	72,226		108,418
Balance, beginning of the period, Valuation Allowance	-21,702		-36,227
Proceeds from sale of other real estate owned and repossessed assets, net, Valuation Allowance	5,961		6,747
Valuation adjustments, net, Valuation Allowance	-35		-1,017
Balance, end of period, Valuation Allowance	-15,776		-30,497
Balance, beginning of the period, Net Balance	66,719		77,247
Transfers to other assets acquired through foreclosure, net, Net Balance	2,110		6,609
Proceeds from sale of other real estate owned and repossessed assets, net, Net Balance	-13,512		-5,373
Valuation adjustments of other repossessed assets, net	-35		-1,017
Gains (losses), net, Net Balance	1,168	[1]	455	[1]
Balance, end of period, Net Balance	$56,450		$77,921
[1]	Includes gains related to initial transfers to other assets of zero and $0.3 million during the three months ended March 31, 2014 and 2013, respectively, pursuant to accounting guidance.

Recovered_Sheet9

Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure (Parenthetical) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'	'
Gains (losses), net, Net Balance	$0	$320

Other_Borrowings_Companys_Borr

Other Borrowings - Company's Borrowings (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Short Term	'	'
Revolving line of credit	$5,000	$3,000
FHLB advances	56,324	25,906
Short-term Debt	61,324	28,906
Long Term	'	'
FHLB advances	217,166	247,973
Other long term debt	64,326	64,217
Long-term Debt	$281,492	$312,190

Other_Borrowings_Additional_In

Other Borrowings - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Debt [Line Items]	'	'	'
Line of credit, amount outstanding	$5,000,000	$3,000,000	'
Line of Credit Facility, Interest Rate at Period End	1.75%	'	'
FHLB advances	56,324,000	25,906,000	'
Weighted average interest rate of FHLB and FRB Short-term advances	2.91%	2.90%	'
FHLB advances	217,166,000	247,973,000	'
Senior Notes, outstanding principal amount	64,900,000	'	'
Senior Notes, carrying amount	64,326,000	64,217,000	'
Senior Notes, Unamortized discount	-600,000	'	'
Long term debt weighted average rate	3.16%	'	3.65%
Fed Funds With Other Institutions [Member]	'	'	'
Debt [Line Items]	'	'	'
Line of credit, amount outstanding	0	'	'
Line of Credit Facility, Maximum Borrowing Capacity	120,000,000	'	'
FHLB [Member]	'	'	'
Debt [Line Items]	'	'	'
Additional available credit with the entity	1,030,000,000	1,390,000,000	'
FRB [Member]	'	'	'
Debt [Line Items]	'	'	'
Additional available credit with the entity	1,000,000,000	588,200,000	'
Other Credit Facilities [Member]	'	'	'
Debt [Line Items]	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	70,000,000	'	'
Unsecured Credit Facility [Member]	'	'	'
Debt [Line Items]	'	'	'
Line of credit, amount outstanding	0	'	'
Line of Credit Facility, Maximum Borrowing Capacity	45,000,000	'	'
Secured Credit Facility [Member]	'	'	'
Debt [Line Items]	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	$25,000,000	'	'

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Loss Contingencies [Line Items]	'	'	'
Letters of credit expiration period	'1 year	'	'
Loss contingency for unfunded loan commitments	2.1	'	2
Percentage of first liens initial loan to value ratio	75.00%	75.00%	'
Percent of commercial real estate loans owner occupied	47.00%	'	46.00%
Total loans unsecured	3.00%	'	4.00%
Rent expense	1.6	1.9	'
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Percent of commercial real estate related loans	56.00%	58.00%	58.00%
Commercial Real Estate Secured By Undeveloped Land [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]	'	'	'
Loss Contingencies [Line Items]	'	'	'
Percent of commercial real estate related loans	1.00%	'	2.00%

Commitments_and_Contingencies_2

Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Commitments [Line Items]	'	'
Total amount	$1,913,173	$1,943,243
Commitments to extend credit [Member]	'	'
Other Commitments [Line Items]	'	'
Total amount	1,840,740	1,878,340
Unsecured Loan Commitments	221,669	237,063
Credit card guarantees [Member]	'	'
Other Commitments [Line Items]	'	'
Total amount	33,932	33,632
Standby letters of credit [Member]	'	'
Other Commitments [Line Items]	'	'
Total amount	38,501	31,271
Unsecured Letters Of Credit	$5,957	$4,896

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Restricted stock grants, net	($3,397,000)	$168,000	'
Stock options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock options outstanding (shares)	802,413	'	1,000,000
Restricted stock awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Restricted stock grants in the period (shares)	376,175	'	'
Vesting period, years	'3 years	'	'
Unvested share-based compensation arrangements, grant date fair value	10,500,000	'	'
Restricted shares outstanding (shares)	1,161,743	'	1,204,216
Stock-based compensation expense	300,000	1,000,000	'
Director [Member] | Restricted stock awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Restricted stock grants in the period (shares)	64,000	'	'
Vesting period, years	'6 months	'	'
Additional Paid in Capital [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Restricted stock grants, net	($3,397,000)	$168,000	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	($21,546)	$8,226
Other comprehensive income before reclassifications	10,644	-924
Amounts reclassified from accumulated other comprehensive loss	-229	-97
Net other comprehensive income (loss)	10,415	-1,021
Ending balance	-11,131	7,205
Unrealized holding gains (losses) on AFS securities	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	-21,690	8,209
Other comprehensive income before reclassifications	10,644	-890
Amounts reclassified from accumulated other comprehensive loss	-229	-97
Net other comprehensive income (loss)	10,415	-987
Ending balance	-11,275	7,222
Impairment loss on securities	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	144	'
Other comprehensive income before reclassifications	0	'
Amounts reclassified from accumulated other comprehensive loss	0	'
Net other comprehensive income (loss)	0	'
Ending balance	144	'
Unrealized gain on cash flow hedge	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning balance	'	17
Other comprehensive income before reclassifications	'	-34
Amounts reclassified from accumulated other comprehensive loss	'	0
Net other comprehensive income (loss)	'	-34
Ending balance	'	($17)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Amount reclassified from accumulated other comprehensive income	($137)	($50)
Amount reclassified from accumulated other comprehensive income	229	97
Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Amount reclassified from accumulated other comprehensive income	229	97
Realized Gain Loss On Sale Of Investment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Realized gains on sales of investment securities	366	147
Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Amount reclassified from accumulated other comprehensive income	($137)	($50)

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Earnings Per Share [Abstract]	'	'	'
Basic	86,256,000	85,324,000	'
Dilutive effect of stock awards	867,000	656,000	'
Diluted	87,123,000	85,980,000	'
Net income available to common shareholders	$30,732	$20,532	'
Earnings per share - basic	$0.35	$0.24	'
Earnings per share - diluted	$0.35	$0.24	'
Stock options excluded from calculation of diluted earnings per share as their effect would be anti-dilutive	4,000	'	163,300

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]	'	'	'
Decreased deferred tax assets net	$2,400,000	'	'
Recognized net deferred tax asset	78,322,000	'	80,688,000
Deferred Tax Assets, Valuation Allowance	4,600,000	'	5,600,000
Deferred tax asset related to federal and state net operating loss carry forwards outstanding	9,800,000	'	'
Tax benefits from federal net operating loss carry forwards	8,300,000	'	'
Net deferred tax asset relating to NUBILs available to reduce tax liability in future years	1,800,000	'	'
Tax Credit Carryforward Annual Limitations on Deductions From Taxable Income	1,600,000	'	'
Tax Credit Carryforward, Valuation Allowance	1,400,000	'	'
Effective Income Tax Rate Reconciliation, Percent	25.08%	27.19%	'
Arizona [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Deferred Tax Assets, Valuation Allowance	1,400,000	'	'
Tax benefits from state net operating loss carry forwards	1,500,000	'	'
Capital Loss Carryforward [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Deferred Tax Assets, Valuation Allowance	$3,200,000	'	'

Income_Taxes_Impact_of_Adoptio

Income Taxes - Impact of Adoption of New Accounting Pronouncement (Details) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2013

Accounting Standards Update 2014-01 [Member]

Accounting Standards Update 2014-01 [Member]

Accounting Standards Update 2014-01 [Member]

Accounting Standards Update 2014-01 [Member]

Accounting Standards Update 2014-01 [Member]

Accounting Standards Update 2014-01 [Member]

Premises and Equipment [Member]

As previously reported [Member]

As previously reported [Member]

Consolidated Balance Sheet:

'

'

'

'

'

'

'

'

'

'

Deferred tax assets, net

$78,322,000

'

$80,688,000

'

'

$80,688,000

'

'

'

$79,374,000

Other assets

190,460,000

'

185,221,000

'

'

185,221,000

'

'

'

186,288,000

[1]

Stockholders' equity

894,805,000

781,021,000

855,498,000

759,421,000

[2]

'

855,498,000

'

'

'

855,251,000

Consolidated Income Statement:

'

'

'

'

'

'

'

'

'

'

Non-interest income

4,835,000

4,799,000

'

'

4,799,000

'

'

'

3,899,000

'

Income tax expense (benefit)

10,624,000

7,787,000

'

'

7,787,000

'

'

'

6,808,000

'

Income from continuing operations

31,739,000

20,847,000

'

'

20,847,000

'

'

'

20,926,000

'

Net income

31,085,000

20,885,000

'

'

20,885,000

'

'

'

20,964,000

'

Net income available to common shareholders

30,732,000

20,532,000

'

'

20,532,000

'

'

'

20,611,000

'

Basic

$0.36

$0.24

'

'

$0.24

'

'

'

$0.24

'

Diluted

$0.36

$0.24

'

'

$0.24

'

'

'

$0.24

'

Reclassification adjustment

'

'

'

'

'

'

'

-14,600,000

'

'

Cumulative effect to stockholders' equity

'

'

'

'

'

200,000

-200,000

'

'

'

Investment in Low Income Housing Tax Credit

129,300,000

'

'

'

'

'

'

'

'

'

Deferred Tax Assets, Tax Credit Carryforwards

68,300,000

'

'

'

'

'

'

'

'

'

Amortization of Low Income Housing Tax Credits

$3,000,000

'

'

'

'

'

'

'

'

'

[1]

Includes a $14.6 million reclassification from premises and equipment, net.

[2]

{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjJiM2U2Y2I0NjI4ODQyMzFhZWNhNDY0NjRmMjM1OWFmfFRleHRTZWxlY3Rpb246QTE0QUVBNTBEQjJBOTAyODYxRUU2NjA5QkUwRUZENzEM}

Fair_Value_Accounting_Gains_an

Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]	'	'
Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net	($960)	($471)
Interest Income on Securities	1	2
Interest Expense on Junior Subordinated Debt	-421	-466
Total Changes Included in Current-Period Earnings	-1,380	-935
Securities measured at fair value [Member]	'	'
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]	'	'
Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net	18	-2
Interest Income on Securities	1	2
Interest Expense on Junior Subordinated Debt	0	0
Total Changes Included in Current-Period Earnings	19	0
Junior subordinated debt [Member]	'	'
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]	'	'
Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net	-978	-469
Interest Income on Securities	0	0
Interest Expense on Junior Subordinated Debt	-421	-466
Total Changes Included in Current-Period Earnings	($1,399)	($935)

Fair_Value_Accounting_Gains_an1

Fair Value Accounting - Gains and Losses from Fair Value Changes on Securities Measured at Fair Value (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net losses for the period on trading securities included in earnings	$18	($2)
Less: net gains and (losses) recognized during the period on trading securities sold during the period	0	0
Change in unrealized gains or (losses) for the period included in earnings for trading securities held at the end of the reporting period	$18	($2)

Fair_Value_Accounting_Fair_Val

Fair Value Accounting - Fair Value of Assets and Liabilities (Detail) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

In Thousands, unless otherwise specified

Level 3 [Member]

Level 3 [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

Residential MBS issued by GSEs [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

U.S. Government-sponsored agency securities [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Municipal obligations [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Mutual funds [Member]

Mutual funds [Member]

Mutual funds [Member]

Mutual funds [Member]

Mutual funds [Member]

Mutual funds [Member]

Mutual funds [Member]

Mutual funds [Member]

Commercial MBS issued by GSEs [Member]

Commercial MBS issued by GSEs [Member]

Commercial MBS issued by GSEs [Member]

Commercial MBS issued by GSEs [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label residential MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Private label commercial MBS [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

Trust preferred securities [Member]

CRA investments [Member]

CRA investments [Member]

CRA investments [Member]

CRA investments [Member]

CRA investments [Member]

CRA investments [Member]

CRA investments [Member]

CRA investments [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 2 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Level 1 [Member]

Level 1 [Member]

Level 2 [Member]

Level 2 [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities measured at fair value

$2,943

$3,036

'

'

$2,943

'

$0

'

$2,943

'

$0

'

$2,460

$3,036

$0

$0

$2,460

$3,036

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$483

'

$0

'

$483

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities available for sale

1,366,433

1,370,696

'

'

1,366,433

1,370,696

134,687

121,298

1,231,746

1,249,398

0

0

987,407

1,021,421

0

0

987,407

1,021,421

0

0

57,672

46,975

0

0

57,672

46,975

0

0

118,878

115,665

0

0

118,878

115,665

0

0

73,947

61,484

73,947

61,484

0

0

0

0

37,243

36,532

37,243

36,532

0

0

0

0

2,034

0

2,034

0

35,615

36,099

0

0

35,615

36,099

0

0

5,412

5,433

0

0

5,412

5,433

0

0

24,728

23,805

0

0

24,728

23,805

0

0

23,497

23,282

23,497

23,282

0

0

0

0

Positive NPVs on interest rate swaps

'

'

'

'

14,650

2,783

0

0

14,650

2,783

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Junior subordinated debt

'

'

42,836

41,858

42,836

41,858

0

0

0

0

42,836

41,858

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Negative NPVs on interest rate swaps

'

'

'

'

$15,553

$4,168

$0

$0

$15,553

$4,168

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

Fair_Value_Accounting_Change_i

Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012	($960)		($471)		'
Level 3 [Member]	'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'
Junior subordinated debt	42,836		41,858		'
Junior subordinated debt, Valuation Technique	'Discounted cash flow		'Discounted cash flow		'
Junior subordinated debt, Significant Unobservable Inputs	'BB Corporate Bond over Treasury Index with comparable credit spread		'BB Corporate Bond over Treasury Index with comparable credit spread		'
Junior subordinated debt [Member]	'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012	-978		-469		'
Junior subordinated debt, Input Value	5.69%		5.86%		5.86%
Fair Value, Measurements, Recurring [Member]	'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'
Junior subordinated debt	42,836		'		41,858
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'
Junior subordinated debt	42,836		'		41,858
Fair Value, Measurements, Recurring [Member] | Junior subordinated debt [Member]	'		'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'		'
Opening balance	-41,858		-36,218		-36,218
Included in earnings (or changes in net assets)	-978	[1]	-469	[1]	'
Closing balance	-42,836		-36,687		'
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012	($978)		($469)		'
[1]	Total losses for the period are included in the non-interest income line, unrealized losses on assets / liabilities measured at fair value, net.

Fair_Value_Accounting_Assets_M

Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans with an allowance recorded	$22,127	$25,754
Impaired loans without specific valuation allowance	149,135	152,623
Other assets acquired through foreclosure	56,100	'
Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans with an allowance recorded	22,100	25,800
Fair Value, Measurements, Nonrecurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans with an allowance recorded	18,202	20,474
Impaired loans without specific valuation allowance	91,925	95,695
Other assets acquired through foreclosure	56,450	66,719
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans with an allowance recorded	0	0
Impaired loans without specific valuation allowance	0	0
Other assets acquired through foreclosure	0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans with an allowance recorded	0	0
Impaired loans without specific valuation allowance	0	0
Other assets acquired through foreclosure	0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans with an allowance recorded	18,202	20,474
Impaired loans without specific valuation allowance	91,925	95,695
Other assets acquired through foreclosure	$56,450	$66,719

Fair_Value_Accounting_Debt_Sec

Fair Value Accounting - Debt Security Credit Losses Recognized in Other Comprehensive Income/Earnings (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Beginning balance of impairment losses held in other comprehensive income	$0	($1,811)
Current period other-than temporary impairment credit losses recognized through earnings	0	0
Reductions for securities sold during the period	0	0
Additions or reductions in credit losses due to change of intent to sell	0	0
Reductions for increases in cash flows to be collected on impaired securities	0	0
Ending balance of net unrealized gains and (losses) held in other comprehensive income	$0	($1,811)

Fair_Value_Accounting_Estimate

Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified			Level 3 [Member]	Level 3 [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]	Fair Value, Measurements, Recurring [Member]
							Level 1 [Member]	Level 1 [Member]	Level 2 [Member]	Level 2 [Member]	Level 3 [Member]	Level 3 [Member]	Carrying Amount [Member]	Carrying Amount [Member]	Fair Value [Member]	Fair Value [Member]	Fair Value [Member]	Fair Value [Member]	Fair Value [Member]	Fair Value [Member]	Fair Value [Member]	Fair Value [Member]
																	Level 1 [Member]	Level 1 [Member]	Level 2 [Member]	Level 2 [Member]	Level 3 [Member]	Level 3 [Member]
Financial assets	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
HTM	$275,738	$283,006	'	'	'	'	'	'	'	'	'	'	$275,738	$283,006	$281,483	$281,704	$10,781	$22,200	$270,694	$259,496	$8	$8
Securities available for sale	1,366,433	1,370,696	'	'	1,366,433	1,370,696	134,687	121,298	1,231,746	1,249,398	0	0	1,366,433	1,370,696	1,366,433	1,370,696	134,687	121,298	1,231,746	1,249,398	0	0
Securities measured at fair value	2,943	3,036	'	'	2,943	'	0	'	2,943	'	0	'	2,943	3,036	2,943	3,036	0	0	2,943	3,036	0	0
Positive NPVs on interest rate swaps	'	'	'	'	14,650	2,783	0	0	14,650	2,783	0	0	14,650	2,783	14,650	2,783	0	0	14,650	2,783	0	0
Loans, net	7,004,700	6,701,365	'	'	'	'	'	'	'	'	'	'	7,004,700	6,701,365	6,468,391	6,207,131	0	0	6,358,264	6,090,962	110,127	116,169
Financial liabilities	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Deposits	8,148,973	7,838,205	'	'	'	'	'	'	'	'	'	'	8,148,973	7,838,205	8,152,956	7,842,014	0	0	8,152,956	7,842,014	0	0
Customer repurchases	57,407	71,192	'	'	'	'	'	'	'	'	'	'	57,407	71,192	57,407	71,192	0	0	57,407	71,192	0	0
Securities sold short	109,793	0	'	'	'	'	'	'	'	'	'	'	109,793	'	109,793	'	109,793	'	0	'	0	'
FHLB and FRB advances	'	'	'	'	'	'	'	'	'	'	'	'	273,490	273,879	273,490	273,879	0	0	273,490	273,879	0	0
Other borrowed funds	'	'	'	'	'	'	'	'	'	'	'	'	69,326	67,217	76,683	74,475	5,000	3,000	0	0	71,683	71,475
Junior subordinated debt	'	'	42,836	41,858	42,836	41,858	0	0	0	0	42,836	41,858	42,836	41,858	42,836	41,858	0	0	0	0	42,836	41,858
Negative NPVs on interest rate swaps	'	'	'	'	$15,553	$4,168	$0	$0	$15,553	$4,168	$0	$0	$15,553	$4,168	$15,553	$4,168	$0	$0	$15,553	$4,168	$0	$0

Fair_Value_Accounting_Addition

Fair Value Accounting - Additional Information (Detail) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

In Thousands, unless otherwise specified

Collateralized debt obligations [Member]

Collateralized debt obligations [Member]

Level 3 [Member]

Level 3 [Member]

Junior subordinated debt [Member]

Junior subordinated debt [Member]

Junior subordinated debt [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Level 3 [Member]

Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Junior subordinated debt, Input Value

'

'

'

'

'

'

'

'

5.69%

5.86%

5.86%

'

'

'

'

Debt instrument, basis point spread

'

'

'

'

'

'

'

'

5.46%

'

5.62%

'

'

'

'

Period of basis point spread

'

'

'

'

'

'

'

'

'3 months

'

'3 months

'

'

'

'

Percentage of LIBOR

'

'

'

'

'

'

'

'

0.23%

'

0.25%

'

'

'

'

Aggregate carrying amount of impaired loans

$22,127

$25,754

'

'

'

'

$22,100

$25,800

'

'

'

$18,202

$20,474

$18,202

$20,474

Impaired loans with an allowance recorded

3,925

5,280

'

'

'

'

3,900

5,300

'

'

'

'

'

'

'

Other assets acquired through foreclosure, net

$56,450

$66,719

$77,921

$77,247

'

'

'

'

'

'

'

'

'

'

'

Securities contained credit losses

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

Discontinued_Operations_Summar

Discontinued Operations - Summary of Operating Results of Discontinued Operations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Net (loss) income	($654)	$38
PartnersFirst [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Operating revenue	-144	1,139
Non-interest expenses	-858	-1,074
(Loss) income before income taxes	-1,002	65
Income tax (benefit) expense	-348	27
Net (loss) income	($654)	$38

Segments_Operating_Segment_Inf

Segments - Operating Segment Information (Detail) (USD $)	3 Months Ended					3 Months Ended					12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012		Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
	Subsidiary					Reportable Geographical Components [Member]	Reportable Geographical Components [Member]	Reportable Geographical Components [Member]	Operating Segments [Member]	Corporate, Non-Segment [Member]	Wholly Owned Subsidiary Banks [Member]
						ARIZONA	NEVADA	CALIFORNIA	Specialty Finance Segment [Member]		Subsidiary
Operating Statistics [Line Items]	'	'	'	'		'	'	'	'	'	'
Number of wholly-owned subsidiaries	9	'	'	'		'	'	'	'	'	3
Cash, cash equivalents and investment securities	$2,137,200,000	'	'	'		$3,300,000	$7,000,000	$2,600,000	$500,000	$2,123,800,000	'
Loans, net of deferred loan fees and costs	7,108,599,000	'	6,801,415,000	'		2,032,300,000	1,723,800,000	1,663,100,000	1,621,200,000	68,200,000	'
Less: allowance for credit losses	-103,899,000	'	-100,050,000	'		-29,700,000	-25,200,000	-24,300,000	-23,700,000	-1,000,000	'
Total loans held for investment	7,004,700,000	'	6,701,365,000	'		2,002,600,000	1,698,600,000	1,638,800,000	1,597,500,000	67,200,000	'
Other repossessed assets	56,100,000	'	'	'		11,900,000	21,900,000	300,000	0	22,000,000	'
Goodwill and intangible assets, net	26,800,000	'	'	'		2,400,000	24,400,000	0	0	0	'
Other assets	521,900,000	'	'	'		33,800,000	67,800,000	25,500,000	18,000,000	376,700,000	'
Total assets	9,746,624,000	'	9,307,342,000	'		2,054,000,000	1,819,700,000	1,667,200,000	1,616,000,000	2,589,700,000	'
Deposits	8,148,973,000	'	7,838,205,000	'		2,166,000,000	3,024,600,000	1,867,300,000	845,100,000	246,000,000	'
Other borrowings	342,816,000	'	341,096,000	'		0	0	0	0	342,800,000	'
Other liabilities	360,000,000	'	'	'		21,700,000	48,300,000	9,800,000	20,400,000	259,800,000	'
Total liabilities	8,851,819,000	'	8,451,844,000	'		2,187,700,000	3,072,900,000	1,877,100,000	865,500,000	848,600,000	'
Allocated equity	894,805,000	781,021,000	855,498,000	759,421,000	[1]	219,400,000	207,900,000	178,700,000	123,200,000	165,600,000	'
Liabilities and Equity	9,746,624,000	'	9,307,342,000	'		2,407,100,000	3,280,800,000	2,055,800,000	988,700,000	1,014,200,000	'
Excess funds provided (used)	0	'	'	'		353,100,000	1,461,100,000	388,600,000	-627,300,000	-1,575,500,000	'
Reconciliation of net income:	'	'	'	'		'	'	'	'	'	'
Net interest income	90,777,000	76,203,000	'	'		26,608,000	28,595,000	22,792,000	13,964,000	-1,182,000	'
Provision for credit losses	3,500,000	5,439,000	'	'		1,558,000	-884,000	655,000	2,170,000	1,000	'
Net interest income (loss) after provision for credit losses	87,277,000	70,764,000	'	'		25,050,000	29,479,000	22,137,000	11,794,000	-1,183,000	'
Non-interest income	4,835,000	4,799,000	'	'		820,000	2,289,000	1,250,000	82,000	394,000	'
Non-interest expense	-49,749,000	-46,929,000	'	'		-13,304,000	-15,236,000	-13,043,000	-6,508,000	-1,658,000	'
Income from continuing operations before income taxes	42,363,000	28,634,000	'	'		12,566,000	16,532,000	10,344,000	5,368,000	-2,447,000	'
Income tax expense (benefit)	10,624,000	7,787,000	'	'		4,929,000	5,787,000	4,350,000	2,013,000	-6,455,000	'
Income from continuing operations	31,739,000	20,847,000	'	'		7,637,000	10,745,000	5,994,000	3,355,000	4,008,000	'
Loss from discontinued operations, net	-654,000	38,000	'	'		0	0	0	0	-654,000	'
Net income	$31,085,000	$20,885,000	'	'		$7,637,000	$10,745,000	$5,994,000	$3,355,000	$3,354,000	'
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