Bank of Hawaii (BOH) 10-Q 20 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 14, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	BANK OF HAWAII CORP
Entity Central Index Key	46195
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,616,439
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest Income
Interest and Fees on Loans and Leases	$70,961	$63,526
Income on Investment Securities
Available-for-Sale	10,198	10,760
Held-to-Maturity	24,407	27,889
Deposits	3	3
Funds Sold	259	137
Other	302	302
Total Interest Income	106,130	102,617
Interest Expense
Deposits	2,368	2,358
Securities Sold Under Agreements to Repurchase	6,371	6,397
Funds Purchased	3	3
Other Debt	618	626
Total Interest Expense	9,360	9,384
Net Interest Income	96,770	93,233
Provision for Credit Losses	0	0
Net Interest Income After Provision for Credit Losses	96,770	93,233
Noninterest Income
Trust and Asset Management	12,180	11,852
Mortgage Banking	1,693	2,005
Service Charges on Deposit Accounts	8,537	8,878
Fees, Exchange, and Other Service Charges	12,897	12,939
Investment Securities Gains, Net	10,231	2,160
Annuity and Insurance	2,044	2,123
Bank-Owned Life Insurance	1,734	1,602
Other	2,991	3,209
Total Noninterest Income	52,307	44,768
Noninterest Expense
Salaries and Benefits	49,780	46,897
Net Occupancy	9,333	9,417
Net Equipment	5,288	4,603
Data Processing	3,773	3,649
Professional Fees	2,334	2,260
FDIC Insurance	2,140	2,076
Other	14,267	14,645
Total Noninterest Expense	86,915	83,547
Income Before Provision for Income Taxes	62,162	54,454
Provision for Income Taxes	19,720	15,862
Net Income	$42,442	$38,592
Basic Earnings Per Share (in dollars per share)	$0.98	$0.87
Diluted Earnings Per Share (in dollars per share)	$0.97	$0.87
Dividends Declared Per Share (in dollars per share)	$0.45	$0.45
Basic Weighted Average Shares (in shares)	43,386,402	44,193,267
Diluted Weighted Average Shares (in shares)	43,597,504	44,420,349

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$42,442	$38,592
Other Comprehensive Income, Net of Tax:
Net Unrealized Gains on Investment Securities	5,294	6,271
Defined Benefit Plans	220	156
Total Other Comprehensive Income	5,514	6,427
Comprehensive Income	$47,956	$45,019

Consolidated_Statements_of_Con

Consolidated Statements of Condition (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Interest-Bearing Deposits in Other Banks	$3,383	$2,873
Funds Sold	620,331	360,577
Investment Securities
Available-for-Sale	2,271,186	2,289,190
Held-to-Maturity (Fair Value of $4,378,007 and $4,504,495)	4,306,353	4,466,679
Loans Held for Sale	1,951	5,136
Loans and Leases	7,178,628	6,897,589
Allowance for Loan and Lease Losses	-107,461	-108,688
Net Loans and Leases	7,071,167	6,788,901
Total Earning Assets	14,274,371	13,913,356
Cash and Due From Banks	151,793	172,126
Premises and Equipment, Net	109,223	109,854
Accrued Interest Receivable	47,017	44,654
Foreclosed Real Estate	2,095	2,311
Mortgage Servicing Rights	23,643	24,695
Goodwill	31,517	31,517
Bank Owned Life Insurance	264,228	262,807
Other Assets	235,292	225,888
Total Assets	15,139,179	14,787,208
Deposits
Noninterest-Bearing Demand	4,047,334	3,832,943
Interest-Bearing Demand	2,608,664	2,559,570
Savings	5,014,686	4,806,575
Time	1,308,932	1,434,001
Total Deposits	12,979,616	12,633,089
Funds Purchased	8,459	8,459
Securities Sold Under Agreements to Repurchase	672,329	688,601
Other Debt	173,898	173,912
Retirement Benefits Payable	55,197	55,477
Accrued Interest Payable	5,836	5,148
Taxes Payable and Deferred Taxes	46,987	27,777
Other Liabilities	121,606	139,659
Total Liabilities	14,063,928	13,732,122
Shareholders’ Equity
Common Stock ($.01 par value; authorized 500,000,000 shares; issued / outstanding: March 31, 2015 - 57,733,267 / 43,652,628 and December 31, 2014 - 57,634,755 / 43,724,208)	575	574
Capital Surplus	534,141	531,932
Accumulated Other Comprehensive Loss	-21,172	-26,686
Retained Earnings	1,257,341	1,234,801
Treasury Stock, at Cost (Shares: March 31, 2015 - 14,080,639 and December 31, 2014 - 13,910,547)	-695,634	-685,535
Total Shareholders’ Equity	1,075,251	1,055,086
Total Liabilities and Shareholders’ Equity	$15,139,179	$14,787,208

Consolidated_Statements_of_Con1

Consolidated Statements of Condition (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Held-to-Maturity Securities, Fair Value	$4,378,007	$4,504,495
Common Stock, par value (in dollars per share)	$0.01	$0.01
Common Stock, authorized shares	500,000,000	500,000,000
Common Stock, issued shares	57,733,267	57,634,755
Common Stock, outstanding shares	43,652,628	43,724,208
Treasury Stock, Shares	14,080,639	13,910,547

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (Unaudited) (USD $)	Total	Common Stock	Capital Surplus	Accum. Other Compre- hensive Income (Loss)	Retained Earnings	Treasury Stock
In Thousands, except Share data, unless otherwise specified
Beginning Balance at Dec. 31, 2013	$1,011,976	$572	$522,505	($31,823)	$1,151,754	($631,032)
Beginning Balance (in shares) at Dec. 31, 2013		44,490,385
Increase (decrease) in shareholders' equity
Net Income	38,592				38,592
Other Comprehensive Income (Loss)	6,427			6,427
Share-Based Compensation	1,808		1,808
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	4,458	1	599		-205	4,063
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		222,762
Common Stock Repurchased	-14,284					-14,284
Common Stock Repurchased (in shares)		-245,554
Cash Dividends Declared ($0.45 per share)	-20,073				-20,073
Ending Balance at Mar. 31, 2014	1,028,904	573	524,912	-25,396	1,170,068	-641,253
Ending Balance (in shares) at Mar. 31, 2014		44,467,593
Beginning Balance at Dec. 31, 2014	1,055,086	574	531,932	-26,686	1,234,801	-685,535
Beginning Balance (in shares) at Dec. 31, 2014	43,724,208	43,724,208
Increase (decrease) in shareholders' equity
Net Income	42,442				42,442
Other Comprehensive Income (Loss)	5,514			5,514
Share-Based Compensation	1,776		1,776
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	3,261	1	433		-218	3,045
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		155,646
Common Stock Repurchased	-13,144					-13,144
Common Stock Repurchased (in shares)		-227,226
Cash Dividends Declared ($0.45 per share)	-19,684				-19,684
Ending Balance at Mar. 31, 2015	$1,075,251	$575	$534,141	($21,172)	$1,257,341	($695,634)
Ending Balance (in shares) at Mar. 31, 2015	43,652,628	43,652,628

Consolidated_Statements_of_Sha1

Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends Declared Per Share (in dollars per share)	$0.45	$0.45

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net Income	$42,442	$38,592
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	0	0
Depreciation and Amortization	3,192	3,085
Amortization of Deferred Loan and Lease Fees	-364	-482
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	12,740	12,157
Share-Based Compensation	1,776	1,808
Benefit Plan Contributions	-667	-326
Deferred Income Taxes	1,287	4,482
Net Gains on Sales of Loans and Leases	-748	-821
Net Gains on Sales of Investment Securities	-10,231	-2,160
Proceeds from Sales of Loans Held for Sale	10,509	39,206
Originations of Loans Held for Sale	-6,946	-34,390
Tax Benefits from Share-Based Compensation	-254	-353
Net Change in Other Assets and Other Liabilities	-13,649	-11,557
Net Cash Provided by Operating Activities	39,087	49,241
Investment Securities Available-for-Sale:
Proceeds from Prepayments and Maturities	92,318	82,737
Proceeds from Sales	10,298	10,735
Purchases	-72,223	-31,268
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	184,163	177,352
Purchases	-29,928	-216,533
Net Change in Loans and Leases	-281,910	-116,377
Premises and Equipment, Net	-2,561	-1,772
Net Cash Used in Investing Activities	-99,843	-95,126
Financing Activities
Net Change in Deposits	346,527	129,817
Net Change in Short-Term Borrowings	-16,272	27,539
Tax Benefits from Share-Based Compensation	254	353
Proceeds from Issuance of Common Stock	3,006	4,105
Repurchase of Common Stock	-13,144	-14,284
Cash Dividends Paid	-19,684	-20,073
Net Cash Provided by Financing Activities	300,687	127,457
Net Change in Cash and Cash Equivalents	239,931	81,572
Cash and Cash Equivalents at Beginning of Period	535,576	463,746
Cash and Cash Equivalents at End of Period	775,507	545,318
Supplemental Information
Cash Paid for Interest	8,672	8,512
Cash Paid for Income Taxes	1,776	1,353
Non-Cash Investing Activities:
Transfer from Loans to Foreclosed Real Estate	$83	$982

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Basis of Presentation
	Bank of Hawaii Corporation (the “Parent”) is a Delaware corporation and a bank holding company headquartered in Honolulu, Hawaii.  Bank of Hawaii Corporation and its subsidiaries (collectively, the “Company”) provide a broad range of financial products and services to customers in Hawaii, Guam, and other Pacific Islands.  The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”).  All significant intercompany accounts and transactions have been eliminated in consolidation.
	The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X.  Accordingly, they do not include all of the information and accompanying notes required by GAAP for complete financial statements.  In the opinion of management, the consolidated financial statements reflect normal recurring adjustments necessary for a fair presentation of the results for the interim periods.
	Certain prior period information has been reclassified to conform to the current period presentation.
	These statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.  Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes.  Actual results may differ from those estimates and such differences could be material to the financial statements.
	Accounting Standards Adopted in 2015
	In January 2014, the FASB issued ASU No. 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects." ASU No. 2014-01 permits 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. This new guidance also requires new disclosures for all investors in these projects (see Note 5 to the Consolidated Financial Statements). The Company adopted ASU No. 2014-01 effective January 1, 2015. Upon adoption, the guidance must be applied retrospectively to all periods presented. However, entities that used the effective yield method to account for investments in these projects before adoption may continue to do so for these pre-existing investments. Prior to adoption of ASU No. 2014-01, the Company accounted for such investments using the effective yield method and continued to do so for these pre-existing investments after adopting ASU No. 2014-01. The Company expects future investments to meet the criteria required for the proportional amortization method and plans to make such an accounting policy election. There were no new investments made since the adoption of ASU No. 2014-01 on January 1, 2015, and therefore, the adoption of ASU No. 2014-01 did not have a material impact on the Company's Consolidated Financial Statements.
	In January 2014, the FASB issued ASU No. 2014-04, "Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure." The objective of this guidance 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. ASU No. 2014-04 states that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (1) The creditor obtaining legal title to the residential real estate property upon completion of a foreclosure; or (2) The borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, ASU No. 2014-04 requires interim and annual disclosure of both: (1) The amount of foreclosed residential real estate property held by the creditor; and (2) The recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The Company adopted ASU No. 2014-04 effective January 1, 2015. The adoption of ASU No. 2014-04 did not have a material impact on the Company's Consolidated Financial Statements.
	In June 2014, the FASB issued ASU No. 2014-11, "Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The new guidance aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as repurchase financings with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. The amendments in the ASU require a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The amendments in the ASU also require expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The Company adopted the amendments in this ASU effective January 1, 2015. In addition, the expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings is effective for the Company’s reporting period ending June 30, 2015. As of March 31, 2015, all of the Company's repurchase agreements were typical in nature (i.e., not repurchase-to-maturity transactions or repurchase agreements executed as a repurchase financing) and are accounted for as secured borrowings. As such, the adoption of ASU No. 2014-11 did not have a material impact on the Company's Consolidated Financial Statements.
	In June 2014, the FASB issued ASU No. 2014-12, "Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period." The amendments in the ASU require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718, Compensation - Stock Compensation, as it relates to awards with performance conditions that affect vesting to account for such awards. The performance target should not be reflected in estimating the grant-date fair value of the award. However, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. The Company adopted ASU No. 2014-12 effective January 1, 2015. Entities may apply the amendments in this ASU either: (1) prospectively to all awards granted or modified after the effective date; or (2) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. As of March 31, 2015, the Company did not have any share-based payment awards that included performance targets that could be achieved after the requisite service period. As such, the adoption of ASU No. 2014-12 did not have a material impact on the Company's Consolidated Financial Statements.
	In August 2014, the FASB issued ASU No. 2014-14, “Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure.” The objective of this guidance is to reduce diversity in practice related to how creditors classify government-guaranteed mortgage loans, including FHA or VA guaranteed loans, upon foreclosure. Some creditors reclassify those loans to real estate consistent with other foreclosed loans that do not have guarantees; others reclassify the loans to other receivables. The amendments in this guidance require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) The loan has a government guarantee that is not separable from the loan before foreclosure; (2) At the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (3) At the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The Company adopted ASU No. 2014-14 effective January 1, 2015. The adoption of ASU No. 2014-14 did not have a material impact on the Company's Consolidated Financial Statements.
	Accounting Standards Pending Adoption
	In May 2014, the FASB and the International Accounting Standards Board (the "IASB") jointly issued a comprehensive new revenue recognition standard that will supersede nearly all existing revenue recognition guidance under GAAP and International Financial Reporting Standards ("IFRS"). Previous revenue recognition guidance in GAAP comprised broad revenue recognition concepts together with numerous revenue requirements for particular industries or transactions, which sometimes resulted in different accounting for economically similar transactions. In contrast, IFRS provided limited revenue recognition guidance and, consequently, could be difficult to apply to complex transactions. Accordingly, the FASB and the IASB initiated a joint project to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS that would: (1) Remove inconsistencies and weaknesses in revenue requirements; (2) Provide a more robust framework for addressing revenue issues; (3) Improve comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets; (4) Provide more useful information to users of financial statements through improved disclosure requirements; and (5) Simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer. To meet those objectives, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies generally will be required to use more judgment and make more estimates than under current guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The standard is effective for public entities for interim and annual reporting periods beginning after December 15, 2016; early adoption is not permitted. For financial reporting purposes, the standard allows for either full retrospective adoption, meaning the standard is applied to all of the periods presented, or modified retrospective adoption, meaning the standard is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company is currently evaluating the provisions of ASU No. 2014-09 and will be closely monitoring developments and additional guidance to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements.
	In February 2015, the FASB issued ASU No. 2015-02, “Amendments to the Consolidation Analysis.” This ASU affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. Specifically, the amendments: (1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (“VIEs”) or voting interest entities; (2) Eliminate the presumption that a general partner should consolidate a limited partnership; (3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships; and (4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. ASU No. 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently evaluating the provisions of ASU No. 2015-02 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements.
	In April 2015, the FASB issued ASU No. 2015-05, “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” This ASU provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The new guidance does not change the accounting for a customer’s accounting for service contracts. ASU No. 2015-05 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently evaluating the provisions of ASU No. 2015-05 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements.

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	The amortized cost, gross unrealized gains and losses, and fair value of the Company’s investment securities as of March 31, 2015 and December 31, 2014 were as follows:
	(dollars in thousands)	Amortized Cost		Gross			Gross			Fair Value
				Unrealized Gains			Unrealized Losses
	31-Mar-15
	Available-for-Sale:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	350,177	$	5,610		$	(136	)	$	355,651
	Debt Securities Issued by States and Political Subdivisions	727,980		25,068			(580		)	752,468
	Debt Securities Issued by Corporations	288,225		665			(2,945		)	285,945
	Mortgage-Backed Securities:
	Residential - Government Agencies	417,962		10,325			(896		)	427,391
	Residential - U.S. Government-Sponsored Enterprises	279,708		3,866			—			283,574
	Commercial - Government Agencies	172,040		—			(5,883		)	166,157
	Total Mortgage-Backed Securities	869,710		14,191			(6,779		)	877,122
	Total	$	2,236,092	$	45,534		$	(10,440	)	$	2,271,186
	Held-to-Maturity:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	518,849	$	4,592		$	(69	)	$	523,372
	Debt Securities Issued by States and Political Subdivisions	248,674		16,435			—			265,109
	Debt Securities Issued by Corporations	162,867		1,948			(913		)	163,902
	Mortgage-Backed Securities:
	Residential - Government Agencies	2,706,237		50,307			(10,118		)	2,746,426
	Residential - U.S. Government-Sponsored Enterprises	361,273		6,145			—			367,418
	Commercial - Government Agencies	308,453		4,052			(725		)	311,780
	Total Mortgage-Backed Securities	3,375,963		60,504			(10,843		)	3,425,624
	Total	$	4,306,353	$	83,479		$	(11,825	)	$	4,378,007
	31-Dec-14
	Available-for-Sale:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	325,365	$	5,933		$	(40	)	$	331,258
	Debt Securities Issued by States and Political Subdivisions	723,474		21,941			(1,445		)	743,970
	Debt Securities Issued by Corporations	298,272		546			(3,985		)	294,833
	Mortgage-Backed Securities:
	Residential - Government Agencies	452,493		10,986			(1,043		)	462,436
	Residential - U.S. Government-Sponsored Enterprises	276,390		2,262			(191		)	278,461
	Commercial - Government Agencies	186,813		—			(8,581		)	178,232
	Total Mortgage-Backed Securities	915,696		13,248			(9,815		)	919,129
	Total	$	2,262,807	$	41,668		$	(15,285	)	$	2,289,190
	Held-to-Maturity:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	498,767	$	2,008		$	(1,159	)	$	499,616
	Debt Securities Issued by States and Political Subdivisions	249,559		15,459			—			265,018
	Debt Securities Issued by Corporations	166,686		109			(3,442		)	163,353
	Mortgage-Backed Securities:
	Residential - Government Agencies	2,862,369		45,407			(20,636		)	2,887,140
	Residential - U.S. Government-Sponsored Enterprises	379,365		3,635			(15		)	382,985
	Commercial - Government Agencies	309,933		241			(3,791		)	306,383
	Total Mortgage-Backed Securities	3,551,667		49,283			(24,442		)	3,576,508
	Total	$	4,466,679	$	66,859		$	(29,043	)	$	4,504,495
	The table below presents an analysis of the contractual maturities of the Company’s investment securities as of March 31, 2015.  Debt securities issued by government agencies (Small Business Administration securities) and mortgage-backed securities are disclosed separately in the table below as these investment securities may prepay prior to their scheduled contractual maturity dates.
	(dollars in thousands)	Amortized Cost		Fair Value
	Available-for-Sale:
	Due in One Year or Less	$	90,025	$	90,886
	Due After One Year Through Five Years	349,765		351,442
	Due After Five Years Through Ten Years	541,657		554,898
	Due After Ten Years	95,040		102,294
		1,076,487		1,099,520
	Debt Securities Issued by Government Agencies	289,895		294,544
	Mortgage-Backed Securities:
	Residential - Government Agencies	417,962		427,391
	Residential - U.S. Government-Sponsored Enterprises	279,708		283,574
	Commercial - Government Agencies	172,040		166,157
	Total Mortgage-Backed Securities	869,710		877,122
	Total	$	2,236,092	$	2,271,186
	Held-to-Maturity:
	Due in One Year or Less	$	89,760	$	90,447
	Due After One Year Through Five Years	439,937		444,139
Due After Five Years Through Ten Years	224,823		232,586
Due After Ten Years	175,870		185,211
	930,390		952,383
Mortgage-Backed Securities:
Residential - Government Agencies	2,706,237		2,746,426
Residential - U.S. Government-Sponsored Enterprises	361,273		367,418
Commercial - Government Agencies	308,453		311,780
Total Mortgage-Backed Securities	3,375,963		3,425,624
Total	$	4,306,353	$	4,378,007
Investment securities with carrying values of $2.6 billion and $2.8 billion as of March 31, 2015 and December 31, 2014, respectively, were pledged to secure deposits of governmental entities and securities sold under agreements to repurchase.
The table below presents the gains and losses from the sales of investment securities for the three months ended March 31, 2015 and 2014.
	Three Months Ended
	March 31,
(dollars in thousands)	2015		2014
Gross Gains on Sales of Investment Securities	$	10,231	$	2,160
Gross Losses on Sales of Investment Securities	—		—
Net Gains on Sales of Investment Securities	$	10,231	$	2,160
The Company’s investment securities in an unrealized loss position, segregated by continuous length of impairment, were as follows:
	Less Than 12 Months					12 Months or Longer						Total
(dollars in thousands)	Fair Value		Gross Unrealized Losses			Fair Value			Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
31-Mar-15
Available-for-Sale:
Debt Securities Issued by the U.S. Treasury	$	30,513	$	(106	)	$	5,335		$	(30	)	$	35,848	$	(136	)
and Government Agencies
Debt Securities Issued by States	98,931		(580		)	—			—			98,931		(580		)
and Political Subdivisions
Debt Securities Issued by Corporations	24,260		(740		)	167,931			(2,205		)	192,191		(2,945		)
Mortgage-Backed Securities:
Residential - Government Agencies	12,826		(9		)	11,598			(887		)	24,424		(896		)
Commercial - Government Agencies	—		—			166,157			(5,883		)	166,157		(5,883		)
Total Mortgage-Backed Securities	12,826		(9		)	177,755			(6,770		)	190,581		(6,779		)
Total	$	166,530	$	(1,435	)	$	351,021		$	(9,005	)	$	517,551	$	(10,440	)
Held-to-Maturity:
Debt Securities Issued by the U.S. Treasury	$	19,980	$	(3	)	$	30,205		$	(66	)	$	50,185	$	(69	)
and Government Agencies
Debt Securities Issued by Corporations	—		—			77,905			(913		)	77,905		(913		)
Mortgage-Backed Securities:
Residential - Government Agencies	331,511		(1,507		)	502,727			(8,611		)	834,238		(10,118		)
Commercial - Government Agencies	—		—			103,151			(725		)	103,151		(725		)
Total Mortgage-Backed Securities	331,511		(1,507		)	605,878			(9,336		)	937,389		(10,843		)
Total	$	351,491	$	(1,510	)	$	713,988		$	(10,315	)	$	1,065,479	$	(11,825	)
31-Dec-14
Available-for-Sale:
Debt Securities Issued by the U.S. Treasury	$	1,729	$	(2	)	$	5,546		$	(38	)	$	7,275	$	(40	)
and Government Agencies
Debt Securities Issued by States	78,068		(305		)	94,543			(1,140		)	172,611		(1,445		)
and Political Subdivisions
Debt Securities Issued by Corporations	73,829		(1,171		)	180,335			(2,814		)	254,164		(3,985		)
Mortgage-Backed Securities:
Residential - Government Agencies	3,025		(8		)	12,215			(1,035		)	15,240		(1,043		)
Residential - U.S. Government-Sponsored Enterprises	103,824		(191		)	—			—			103,824		(191		)
Commercial - Government Agencies	—		—			178,232			(8,581		)	178,232		(8,581		)
Total Mortgage-Backed Securities	106,849		(199		)	190,447			(9,616		)	297,296		(9,815		)
Total	$	260,475	$	(1,677	)	$	470,871		$	(13,608	)	$	731,346	$	(15,285	)
Held-to-Maturity:
Debt Securities Issued by the U.S. Treasury	$	70,016	$	(134	)	$	144,222		$	(1,025	)	$	214,238	$	(1,159	)
and Government Agencies
Debt Securities Issued by Corporations	46,196		(349		)	82,109			(3,093		)	128,305		(3,442		)
Mortgage-Backed Securities:
Residential - Government Agencies	280,967		(1,207		)	845,911			(19,429		)	1,126,878		(20,636		)
Residential - U.S. Government-Sponsored Enterprises	45,754		(15		)	—			—			45,754		(15		)
Commercial - Government Agencies	124,594		(179		)	171,091			(3,612		)	295,685		(3,791		)
Total Mortgage-Backed Securities	451,315		(1,401		)	1,017,002			(23,041		)	1,468,317		(24,442		)
Total	$	567,527	$	(1,884	)	$	1,243,333		$	(27,159	)	$	1,810,860	$	(29,043	)
The Company does not believe that the investment securities that were in an unrealized loss position as of March 31, 2015, which were comprised of 119 securities, represent an other-than-temporary impairment.  Total gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities.  As of March 31, 2015 and December 31, 2014, the gross unrealized losses reported for mortgage-backed securities were primarily related to investment securities issued by the Government National Mortgage Association. The Company does not intend to sell the investment securities that were in an unrealized loss position and it is not more likely than not that the Company will be required to sell the investment securities before recovery of their amortized cost basis, which may be at maturity.
Interest income from taxable and non-taxable investment securities for the three months ended March 31, 2015 and 2014 were as follows:
	Three Months Ended
	March 31,
(dollars in thousands)	2015		2014
Taxable	$	29,292	$	33,427
Non-Taxable	5,313		5,222
Total Interest Income from Investment Securities	$	34,605	$	38,649
As of March 31, 2015, included in the Company's investment securities portfolio were debt securities issued by political subdivisions within the State of Hawaii of $604.3 million, representing 59% of the total fair value of the Company's municipal debt securities. Of the entire Hawaii municipal bond portfolio, 91% were credit-rated Aa2 or better by Moody's while most of the remaining Hawaii municipal bonds were credit-rated A2 or better by at least one nationally recognized statistical rating organization. Approximately 77% of the Company's Hawaii municipal bond holdings were general obligation issuances. As of March 31, 2015, there were no other holdings of municipal debt securities that were issued by a single state or political subdivision which comprised more than 10% of the total fair value of the Company's municipal debt securities.
As of March 31, 2015, the carrying value of the Company’s Federal Home Loan Bank of Seattle ("FHLB Seattle") and Federal Reserve Bank stock was as follows:
(dollars in thousands)	March 31,		December 31,
	2015		2014
Federal Home Loan Bank Stock	$	44,463	$	47,075
Federal Reserve Bank Stock	19,419		19,299
Total	$	63,882	$	66,374
These securities can only be redeemed or sold at their par value and only to the respective issuing government-supported institution or to another member institution.  The Company records these non-marketable equity securities as a component of other assets and periodically evaluates these securities for impairment.  Management considers these non-marketable equity securities to be long-term investments.  Accordingly, when evaluating these securities for impairment, management considers the ultimate recoverability of the par value rather than recognizing temporary declines in value.
On February 27, 2015, the FHLB Seattle and the Federal Home Loan Bank of Des Moines announced that the members of both banks have ratified the Merger Agreement approved by their boards of directors in September 2014. The combined bank will be headquartered in Des Moines and maintain a western regional office in Seattle. Pending certain closing conditions, the merger is anticipated to become effective by mid-year 2015. The merger is not expected to have a material impact on the Company's Consolidated Financial Statements or the Company's dealings with the combined bank.
Visa Class B Restricted Shares
In 2008, the Company received Visa Class B restricted shares as part of Visa’s initial public offering. These shares are transferable only under limited circumstances until they can be converted into the publicly traded Class A common shares. This conversion will not occur until the settlement of certain litigation which is indemnified by Visa members such as the Company. Visa funded an escrow account from its initial public offering to settle these litigation claims. Should this escrow account not be sufficient to cover these litigation claims, Visa is entitled to fund additional amounts to the escrow account by reducing each member bank's Class B conversion ratio to unrestricted Class A shares. As of March 31, 2015, the conversion ratio was 1.6483.
During the first quarter of 2015, the Company recorded a $10.1 million net gain on the sale of 95,000 Visa Class B shares. Concurrent with these sales, the Company entered into an agreement with the buyer that requires payment to the buyer in the event Visa further reduces the conversion ratio. Based on the existing transfer restriction and the uncertainty of the outcome of certain litigation relating to Visa, the remaining 297,814 Class B shares (490,887 Class A equivalents) that the Company owns are carried at a zero cost basis. The Company also contributed 4,700 Visa Class B restricted shares to the Bank of Hawaii Foundation during first quarter of 2015. The contribution had no impact on noninterest expense; however, the contribution favorably impacted our effective tax rate in 2015.

Loans_and_Leases_and_the_Allow

Loans and Leases and the Allowance for Loan and Lease Losses	3 Months Ended
	Mar. 31, 2015
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Loans and Leases and the Allowance for Loan and Lease Losses	Loans and Leases and the Allowance for Loan and Lease Losses
	Loans and Leases
	The Company’s loan and lease portfolio was comprised of the following as of March 31, 2015 and December 31, 2014:
	(dollars in thousands)	March 31,				December 31,
		2015				2014
	Commercial
	Commercial and Industrial	$	1,141,408			$	1,055,243
	Commercial Mortgage	1,477,902				1,437,513
	Construction	111,381				109,183
	Lease Financing	224,419				226,189
	Total Commercial	2,955,110				2,828,128
	Consumer
	Residential Mortgage	2,699,434				2,571,090
	Home Equity	884,742				866,688
	Automobile	339,686				323,848
	Other 1	299,656				307,835
	Total Consumer	4,223,518				4,069,461
	Total Loans and Leases	$	7,178,628			$	6,897,589
	1	Comprised of other revolving credit, installment, and lease financing.
	Most of the Company's lending activity is with customers located in the State of Hawaii. A substantial portion of the Company's real estate loans are secured by real estate in Hawaii.
	Net gains related to sales of residential mortgage loans, recorded as a component of mortgage banking income were $0.5 million and $0.7 million for the three months March 31, 2015 and 2014, respectively.
	Allowance for Loan and Lease Losses (the “Allowance”)
	The following presents by portfolio segment, the activity in the Allowance for the three months ended March 31, 2015 and 2014.  The following also presents by portfolio segment, the balance in the Allowance disaggregated on the basis of the Company’s impairment measurement method and the related recorded investment in loans and leases as of March 31, 2015 and 2014.
	(dollars in thousands)	Commercial				Consumer				Total
	Three Months Ended March 31, 2015
	Allowance for Loan and Lease Losses:
	Balance at Beginning of Period	$	64,551			$	44,137			$	108,688
	Loans and Leases Charged-Off	(235		)		(3,853		)		(4,088		)
	Recoveries on Loans and Leases Previously Charged-Off	736				2,125				2,861
	Net Loans and Leases Recovered (Charged-Off)	501				(1,728		)		(1,227		)
	Provision for Credit Losses	782				(782		)		—
	Balance at End of Period	$	65,834			$	41,627			$	107,461
	As of March 31, 2015
	Allowance for Loan and Lease Losses:
	Individually Evaluated for Impairment	$	2,212			$	3,534			$	5,746
	Collectively Evaluated for Impairment	63,622				38,093				101,715
	Total	$	65,834			$	41,627			$	107,461
	Recorded Investment in Loans and Leases:
	Individually Evaluated for Impairment	$	26,084			$	39,453			$	65,537
	Collectively Evaluated for Impairment	2,929,026				4,184,065				7,113,091
	Total	$	2,955,110			$	4,223,518			$	7,178,628
	Three Months Ended March 31, 2014
	Allowance for Loan and Lease Losses:
	Balance at Beginning of Period	$	71,446			$	44,008			$	115,454
	Loans and Leases Charged-Off	(819		)		(3,219		)		(4,038		)
	Recoveries on Loans and Leases Previously Charged-Off	941				1,769				2,710
	Net Loans and Leases Recovered (Charged-Off)	122				(1,450		)		(1,328		)
	Provision for Credit Losses	(178		)		178				—
	Balance at End of Period	$	71,390			$	42,736			$	114,126
	As of March 31, 2014
	Allowance for Loan and Lease Losses:
	Individually Evaluated for Impairment	$	8,903			$	3,699			$	12,602
	Collectively Evaluated for Impairment	62,487				39,037				101,524
	Total	$	71,390			$	42,736			$	114,126
	Recorded Investment in Loans and Leases:
	Individually Evaluated for Impairment	$	29,815			$	37,780			$	67,595
	Collectively Evaluated for Impairment	2,542,348				3,599,914				6,142,262
	Total	$	2,572,163			$	3,637,694			$	6,209,857
	Credit Quality Indicators
	The Company uses several credit quality indicators to manage credit risk in an ongoing manner.  The Company uses an internal credit risk rating system that categorizes loans and leases into pass, special mention, or classified categories.  Credit risk ratings are applied individually to those classes of loans and leases that have significant or unique credit characteristics that benefit from a case-by-case evaluation.  These are typically loans and leases to businesses or individuals in the classes which comprise the commercial portfolio segment.  Groups of loans and leases that are underwritten and structured using standardized criteria and characteristics, such as statistical models (e.g., credit scoring or payment performance), are typically risk-rated and monitored collectively.  These are typically loans and leases to individuals in the classes which comprise the consumer portfolio segment.
	The following are the definitions of the Company’s credit quality indicators:
	Pass:	Loans and leases in all classes within the commercial and consumer portfolio segments that are not adversely rated, are contractually current as to principal and interest, and are otherwise in compliance with the contractual terms of the loan or lease agreement. Management believes that there is a low likelihood of loss related to those loans and leases that are considered pass.
	Special Mention:	Loans and leases in the classes within the commercial portfolio segment that have potential weaknesses that deserve management’s close attention. If not addressed, these potential weaknesses may result in deterioration of the repayment prospects for the loan or lease. The special mention credit quality indicator is not used for classes of loans and leases that are included in the consumer portfolio segment. Management believes that there is a moderate likelihood of some loss related to those loans and leases that are considered special mention.
	Classified:	Loans and leases in the classes within the commercial portfolio segment that are inadequately protected by the sound worth and paying capacity of the borrower or of the collateral pledged, if any. Classified loans and leases are also those in the classes within the consumer portfolio segment that are past due 90 days or more as to principal or interest. Residential mortgage loans that are past due 90 days or more as to principal or interest may be considered pass if the Company is in the process of collection and the current loan-to-value ratio is 60% or less. Home equity loans that are past due 90 days or more as to principal or interest may be considered pass if the Company is in the process of collection, the first mortgage is with the Company, and the current combined loan-to-value ratio is 60% or less. Residential mortgage and home equity loans may be current as to principal and interest, but may be considered classified for a period of up to six months following a loan modification. Following a period of demonstrated performance in accordance with the modified contractual terms, the loan may be removed from classified status. Management believes that there is a distinct possibility that the Company will sustain some loss if the deficiencies related to classified loans and leases are not corrected in a timely manner.
The Company’s credit quality indicators are periodically updated on a case-by-case basis.  The following presents by class and by credit quality indicator, the recorded investment in the Company’s loans and leases as of March 31, 2015 and December 31, 2014.
	31-Mar-15
(dollars in thousands)	Commercial				Commercial				Construction				Lease				Total
	and Industrial				Mortgage								Financing				Commercial
Pass	$	1,096,131			$	1,400,719			$	109,608			$	223,942			$	2,830,400
Special Mention	14,982				33,841				—				91				48,914
Classified	30,295				43,342				1,773				386				75,796
Total	$	1,141,408			$	1,477,902			$	111,381			$	224,419			$	2,955,110
(dollars in thousands)	Residential				Home				Automobile				Other 1				Total
	Mortgage				Equity												Consumer
Pass	$	2,684,218			$	880,349			$	339,149			$	298,894			$	4,202,610
Classified	15,216				4,393				537				762				20,908
Total	$	2,699,434			$	884,742			$	339,686			$	299,656			$	4,223,518
Total Recorded Investment in Loans and Leases																	$	7,178,628
	31-Dec-14
(dollars in thousands)	Commercial				Commercial				Construction				Lease				Total
	and Industrial				Mortgage								Financing				Commercial
Pass	$	1,001,474			$	1,358,812			$	107,381			$	225,783			$	2,693,450
Special Mention	17,364				45,082				—				17				62,463
Classified	36,405				33,619				1,802				389				72,215
Total	$	1,055,243			$	1,437,513			$	109,183			$	226,189			$	2,828,128
(dollars in thousands)	Residential				Home				Automobile				Other 1				Total
	Mortgage				Equity												Consumer
Pass	$	2,556,140			$	862,258			$	323,232			$	307,123			$	4,048,753
Classified	14,950				4,430				616				712				20,708
Total	$	2,571,090			$	866,688			$	323,848			$	307,835			$	4,069,461
Total Recorded Investment in Loans and Leases																	$	6,897,589
1	Comprised of other revolving credit, installment, and lease financing.
Aging Analysis
The following presents by class, an aging analysis of the Company’s loan and lease portfolio as of March 31, 2015 and December 31, 2014.
(dollars in thousands)	30 - 59				60 - 89				Past Due				Non-				Total				Current		Total		Non-Accrual
	Days				Days				90 Days				Accrual				Past Due and						Loans and		Loans and
	Past Due				Past Due				or More								Non-Accrual						Leases		Leases that
																									are Current 2
As of March 31, 2015
Commercial
Commercial and Industrial	$	2,852			$	180			$	—			$	8,641			$	11,673			$	1,129,735	$	1,141,408	$	7,402
Commercial Mortgage	1,126				34				—				732				1,892				1,476,010		1,477,902		508
Construction	—				—				—				—				—				111,381		111,381		—
Lease Financing	—				—				—				—				—				224,419		224,419		—
Total Commercial	3,978				214				—				9,373				13,565				2,941,545		2,955,110		7,910
Consumer
Residential Mortgage	6,702				2,208				3,914				14,344				27,168				2,672,266		2,699,434		1,515
Home Equity	3,804				1,378				2,425				2,965				10,572				874,170		884,742		965
Automobile	6,126				963				537				—				7,626				332,060		339,686		—
Other 1	2,122				1,200				1,078				—				4,400				295,256		299,656		—
Total Consumer	18,754				5,749				7,954				17,309				49,766				4,173,752		4,223,518		2,480
Total	$	22,732			$	5,963			$	7,954			$	26,682			$	63,331			$	7,115,297	$	7,178,628	$	10,390
As of December 31, 2014
Commercial
Commercial and Industrial	$	992			$	356			$	2			$	9,088			$	10,438			$	1,044,805	$	1,055,243	$	7,819
Commercial Mortgage	458				—				—				745				1,203				1,436,310		1,437,513		—
Construction	—				—				—				—				—				109,183		109,183		—
Lease Financing	—				—				—				—				—				226,189		226,189		—
Total Commercial	1,450				356				2				9,833				11,641				2,816,487		2,828,128		7,819
Consumer
Residential Mortgage	4,907				2,107				4,506				14,841				26,361				2,544,729		2,571,090		632
Home Equity	3,461				2,661				2,596				3,097				11,815				854,873		866,688		375
Automobile	7,862				1,483				616				—				9,961				313,887		323,848		—
Other 1	2,416				1,049				941				—				4,406				303,429		307,835		—
Total Consumer	18,646				7,300				8,659				17,938				52,543				4,016,918		4,069,461		1,007
Total	$	20,096			$	7,656			$	8,661			$	27,771			$	64,184			$	6,833,405	$	6,897,589	$	8,826
1	Comprised of other revolving credit, installment, and lease financing.
2	Represents non-accrual loans that are not past due 30 days or more; however, full payment of principal and interest is still not expected.
Impaired Loans
The following presents by class, information related to impaired loans as of March 31, 2015 and December 31, 2014.
(dollars in thousands)	Recorded				Unpaid				Related
	Investment				Principal				Allowance for
					Balance				Loan Losses
31-Mar-15
Impaired Loans with No Related Allowance Recorded:
Commercial
Commercial and Industrial	$	11,798			$	17,102
Commercial Mortgage	6,407				6,407
Construction	1,668				1,668
Total Commercial	19,873				25,177				—
Total Impaired Loans with No Related Allowance Recorded	$	19,873			$	25,177			$	—
Impaired Loans with an Allowance Recorded:
Commercial
Commercial and Industrial	$	6,211			$	12,811			$	2,212
Total Commercial	6,211				12,811				2,212
Consumer
Residential Mortgage	31,725				37,786				3,408
Home Equity	1,203				1,203				18
Automobile	5,546				5,546				76
Other 1	979				979				32
Total Consumer	39,453				45,514				3,534
Total Impaired Loans with an Allowance Recorded	$	45,664			$	58,325			$	5,746
Impaired Loans:
Commercial	$	26,084			$	37,988			$	2,212
Consumer	39,453				45,514				3,534
Total Impaired Loans	$	65,537			$	83,502			$	5,746
31-Dec-14
Impaired Loans with No Related Allowance Recorded:
Commercial
Commercial and Industrial	$	9,763			$	15,013			$	—
Commercial Mortgage	6,480				6,480				—
Construction	1,689				1,689				—
Total Commercial	17,932				23,182				—
Total Impaired Loans with No Related Allowance Recorded	$	17,932			$	23,182			$	—
Impaired Loans with an Allowance Recorded:
Commercial
Commercial and Industrial	$	7,184			$	13,784			$	2,387
Total Commercial	7,184				13,784				2,387
Consumer
Residential Mortgage	32,331				37,989				3,445
Home Equity	1,012				1,012				16
Automobile	5,375				5,375				66
Other 1	913				913				34
Total Consumer	39,631				45,289				3,561
Total Impaired Loans with an Allowance Recorded	$	46,815			$	59,073			$	5,948
Impaired Loans:
Commercial	$	25,116			$	36,966			$	2,387
Consumer	39,631				45,289				3,561
Total Impaired Loans	$	64,747			$	82,255			$	5,948
1 Comprised of other revolving credit and installment financing.
The following presents by class, information related to the average recorded investment and interest income recognized on impaired loans for the three months ended March 31, 2015 and 2014.
	Three Months Ended								Three Months Ended
	31-Mar-15								31-Mar-14
(dollars in thousands)	Average Recorded				Interest Income				Average Recorded				Interest Income
	Investment				Recognized				Investment				Recognized
Impaired Loans with No Related Allowance Recorded:
Commercial
Commercial and Industrial	$	10,781			$	98			$	12,875			$	92
Commercial Mortgage	6,444				65				11,036				55
Construction	1,679				27				1,056				16
Total Commercial	18,904				190				24,967				163
Consumer
Other 1	—				—				6				—
Total Consumer	—				—				6				—
Total Impaired Loans with No Related Allowance Recorded	$	18,904			$	190			$	24,973			$	163
Impaired Loans with an Allowance Recorded:
Commercial
Commercial and Industrial	$	6,698			$	26			$	9,176			$	28
Total Commercial	6,698				26				9,176				28
Consumer
Residential Mortgage	32,028				267				31,841				236
Home Equity	1,108				8				876				5
Automobile	5,461				104				5,124				107
Other 1	946				22				367				8
Total Consumer	39,543				401				38,208				356
Total Impaired Loans with an Allowance Recorded	$	46,241			$	427			$	47,384			$	384
Impaired Loans:
Commercial	$	25,602			$	216			$	34,143			$	191
Consumer	39,543				401				38,214				356
Total Impaired Loans	$	65,145			$	617			$	72,357			$	547
1	Comprised of other revolving credit and installment financing.
For the three months ended March 31, 2015 and 2014, the amounts of interest income recognized by the Company within the periods that the loans were impaired were primarily related to loans modified in a troubled debt restructuring that remained on accrual status.  For the three months ended March 31, 2015 and 2014, the amount of interest income recognized using a cash-basis method of accounting during the periods that the loans were impaired was not material.
Modifications
A modification of a loan constitutes a troubled debt restructuring (“TDR”) when the Company for economic or legal reasons related to a borrower’s financial difficulties grants a concession to the borrower that it would not otherwise consider.  Loans modified in a TDR were $61.8 million and $60.2 million as of March 31, 2015 and December 31, 2014, respectively.  There were no commitments to lend additional funds on loans modified in a TDR as of March 31, 2015 and December 31, 2014.
The Company offers various types of concessions when modifying a loan or lease. Commercial and industrial loans modified in a TDR often involve temporary interest-only payments, term extensions, and converting revolving credit lines to term loans. Additional collateral, a co-borrower, or a guarantor is often requested. Commercial mortgage and construction loans modified in a TDR often involve reducing the interest rate for the remaining term of the loan, extending the maturity date at an interest rate lower than the current market rate for new debt with similar risk, or substituting or adding a co-borrower or guarantor. Construction loans modified in a TDR may also involve extending the interest-only payment period. Residential mortgage loans modified in a TDR generally include a lower interest rate and the loan being fully amortized for up to 40 years from the modification effective date. In some cases, the Company may forbear a portion of the unpaid principal balance with a balloon payment due upon maturity or pay-off of the loan. Land loans are also included in the class of residential mortgage loans. Land loans are typically structured as interest-only monthly payments with a balloon payment due at maturity. Land loans modification usually involved extending the interest-only monthly payments up to an additional five years with a balloon payment due at maturity, or re-amortizing the remaining balance over a period up to 360 months. Interest rates are not changed for land loan modifications. Home equity modifications are made infrequently and uniquely designed to meet the specific needs of each borrower. Automobile loans modified in a TDR are primarily comprised of loans where the Company has lowered monthly payments by extending the term.
Loans modified in a TDR are typically already on non-accrual status and partial charge-offs have in some cases already been taken against the outstanding loan balance.  As a result, loans modified in a TDR may have the financial effect of increasing the specific Allowance associated with the loan.  An Allowance for impaired consumer and commercial loans that have been modified in a TDR is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the estimated fair value of the collateral, less any selling costs, if the loan is collateral dependent.  Management exercises significant judgment in developing these estimates.
The following presents by class, information related to loans modified in a TDR during the three months ended March 31, 2015 and 2014.
	Loans Modified as a TDR for the											Loans Modified as a TDR for the
	Three Months Ended March 31, 2015											Three Months Ended March 31, 2014
				Recorded				Increase in							Recorded				Increase in
Troubled Debt Restructurings	Number of			Investment				Allowance				Number of			Investment				Allowance
(dollars in thousands)	Contracts		(as of period end)1				(as of period end)					Contracts		(as of period end)1				(as of period end)
Commercial
Commercial and Industrial	17			$	2,687			$	1			18			$	5,883			$	120
Commercial Mortgage	1			507				—				1			365				—
Total Commercial	18			3,194				1				19			6,248				120
Consumer
Residential Mortgage	5			2,122				61				2			733				23
Home Equity	2			203				3				1			74				1
Automobile	35			780				11				37			626				9
Other 2	22			151				5				10			95				3
Total Consumer	64			3,256				80				50			1,528				36
Total	82			$	6,450			$	81			69			$	7,776			$	156
1	The period end balances reflect all paydowns and charge-offs since the modification date.  TDRs fully paid-off, charged-off, or foreclosed upon by period end are not included.
2	Comprised of other revolving credit and installment financing.
The following presents by class, all loans modified in a TDR that defaulted during the three months ended March 31, 2015 and 2014, and within twelve months of their modification date.  A TDR is considered to be in default once it becomes 60 days or more past due following a modification.
	Three Months Ended							Three Months Ended
	31-Mar-15							31-Mar-14
TDRs that Defaulted During the Period,				Recorded				Recorded
Within Twelve Months of their Modification Date	Number of			Investment				Number of			Investment
(dollars in thousands)	Contracts			(as of period end)1				Contracts			(as of period end)1
Consumer
Residential Mortgage	1			$	306			2			$	517
Automobile	7			152				4			53
Other 2	8			61				3			21
Total Consumer	16			519				9			591
Total	16			$	519			9			$	591
1	The period end balances reflect all paydowns and charge-offs since the modification date.  TDRs fully paid-off, charged-off, or foreclosed upon by period end are not included.
2	Comprised of other revolving credit and installment financing.
Commercial and consumer loans modified in a TDR are closely monitored for delinquency as an early indicator of possible future default.  If loans modified in a TDR subsequently default, the Company evaluates the loan for possible further impairment.  The specific Allowance associated with the loan may be increased, adjustments may be made in the allocation of the Allowance, or partial charge-offs may be taken to further write-down the carrying value of the loan.
Foreclosure Proceedings
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure totaled $9.8 million as of March 31, 2015.

Mortgage_Servicing_Rights

Mortgage Servicing Rights	3 Months Ended
	Mar. 31, 2015
Transfers and Servicing of Financial Assets [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights
	The Company’s portfolio of residential mortgage loans serviced for third parties was $2.8 billion as of March 31, 2015 and $2.9 billion as of December 31, 2014.  Substantially all of these loans were originated by the Company and sold to third parties on a non-recourse basis with servicing rights retained.  These retained servicing rights are recorded as a servicing asset and are initially recorded at fair value (see Note 13 to the Consolidated Financial Statements for more information). Changes to the balance of mortgage servicing rights are recorded in mortgage banking income in the Company’s consolidated statements of income.
	The Company’s mortgage servicing activities include collecting principal, interest, and escrow payments from borrowers; making tax and insurance payments on behalf of borrowers; monitoring delinquencies and executing foreclosure proceedings; and accounting for and remitting principal and interest payments to investors.  Servicing income, including late and ancillary fees, was $1.9 million and $2.0 million for the three months ended March 31, 2015 and 2014.  Servicing income is recorded in mortgage banking income in the Company’s consolidated statements of income.  The Company’s residential mortgage investor loan servicing portfolio is primarily comprised of fixed rate loans concentrated in Hawaii.
	For the three months ended March 31, 2015 and 2014, the change in the carrying value of the Company’s mortgage servicing rights accounted for under the fair value measurement method was as follows:
			Three Months Ended
			March 31,
	(dollars in thousands)		2015				2014
	Balance at Beginning of Period		$	2,604			$	3,826
	Change in Fair Value:
	Due to Change in Valuation Assumptions 1		(251		)		(349		)
	Due to Payoffs		(76		)		(96		)
	Total Changes in Fair Value of Mortgage Servicing Rights		(327		)		(445		)
	Balance at End of Period		$	2,277			$	3,381
	1	Principally represents changes in discount rates and loan repayment rate assumptions, mostly due to changes in interest rates.
	For the three months ended March 31, 2015 and 2014, the change in the carrying value of the Company’s mortgage servicing rights accounted for under the amortization method, net of valuation allowance, was as follows:
		Three Months Ended
		March 31,
	(dollars in thousands)	2015				2014
	Balance at Beginning of Period	$	22,091			$	24,297
	Servicing Rights that Resulted From Asset Transfers	134				354
	Amortization	(839		)		(654		)
	Valuation Allowance Provision	(20		)		—
	Balance at End of Period	$	21,366			$	23,997
	Valuation Allowance:
	Balance at Beginning of Period	$	(57	)		$	—
	Valuation Allowance Provision	(20		)		—
	Balance at End of Period	$	(77	)		$	—
	Fair Value of Mortgage Servicing Rights Accounted for
	Under the Amortization Method
	Beginning of Period	$	22,837			$	30,100
	End of Period	$	21,431			$	28,303
	The key data and assumptions used in estimating the fair value of the Company’s mortgage servicing rights as of March 31, 2015 and December 31, 2014 were as follows:
		March 31,			31-Dec-14
		2015
	Weighted-Average Constant Prepayment Rate 1	12.96	%		11.62	%
	Weighted-Average Life (in years)	5.83			6.28
	Weighted-Average Note Rate	4.27	%		4.28	%
	Weighted-Average Discount Rate 2	10.32	%		10.61	%
	1	Represents annualized loan repayment rate assumption.
	2	Derived from multiple interest rate scenarios that incorporate a spread to the London Interbank Offered Rate swap curve and market volatilities.
	A sensitivity analysis of the Company’s fair value of mortgage servicing rights to changes in certain key assumptions as of March 31, 2015 and December 31, 2014 is presented in the following table.
	(dollars in thousands)	March 31,				December 31,
		2015				2014
	Constant Prepayment Rate
	Decrease in fair value from 25 basis points (“bps”) adverse change	$	(236	)		$	(265	)
	Decrease in fair value from 50 bps adverse change	(467		)		(524		)
	Discount Rate
	Decrease in fair value from 25 bps adverse change	(224		)		(250		)
	Decrease in fair value from 50 bps adverse change	(445		)		(495		)
	This analysis generally cannot be extrapolated because the relationship of a change in one key assumption to the change in the fair value of the Company’s mortgage servicing rights usually is not linear.  Also, the effect of changing one key assumption without changing other assumptions is not realistic.

Low_Income_Housing_Tax_Credit_

Low Income Housing Tax Credit Partnerships	3 Months Ended
	Mar. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Low Income Housing Tax Credit Partnerships	Affordable Housing Projects Tax Credit Partnerships
	The Company makes certain equity investments in various limited partnerships that sponsor affordable housing projects utilizing the Low Income Housing Tax Credit (LIHTC) pursuant to Section 42 of the Internal Revenue Code. The purpose of these investments is to achieve a satisfactory return on capital, to facilitate the sale of affordable housing product offerings, and to assist in achieving goals associated with the Community Reinvestment Act. The primary activities of the limited partnerships include the identification, development, and operation of multi-family housing that is leased to qualifying residential tenants. Generally, these types of investments are funded through a combination of debt and equity.
	The Company is a limited partner in each LIHTC Partnership. A separate unrelated third party is the general partner. Each limited partnership is managed by the general partner, who exercises full control over the affairs of the limited partnership. The general partner has all the rights, powers and authority granted or permitted to be granted to a general partner of a limited partnership. Duties entrusted to the general partner of each limited partnership include, but are not limited to: investment in operating companies, company expenditures, investment of excess funds, borrowing funds, employment of agents, disposition of fund property, prepayment and refinancing of liabilities, votes and consents, contract authority, disbursement of funds, accounting methods, tax elections, bank accounts, insurance, litigation, cash reserve, and use of working capital reserve funds. Except for limited rights granted to consent to certain transactions, the limited partner(s) may not participate in the operation, management, or control of the limited partnership’s business, transact any business in the limited partnership’s name or have any power to sign documents for or otherwise bind the limited partnership. In addition, the general partner may only be removed by the limited partner(s) in the event the general partner fails to comply with the terms of the agreement or is negligent in performing its duties.
	The general partner of each limited partnership has both the power to direct the activities which most significantly affect the performance of each partnership and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. Therefore, the Company has determined that it is not the primary beneficiary of any LIHTC partnership. The Company uses the effective yield method to account for its pre-2015 investments in these entities. Beginning January 1, 2015, any new investments that meet the requirements of the proportional amortization method will be recognized using the proportional amortization method. As of March 31, 2015, there are no investments accounted for under the proportional amortization method. The Company's net affordable housing tax credit investments and related unfunded commitments were $66.6 million and $68.5 million as of March 31, 2015 and December 31, 2014, respectively, and are included in other assets in the consolidated statements of condition.
	Unfunded Commitments
	As of March 31, 2015, the expected payments for unfunded affordable housing commitments were as follows:
	(dollars in thousands)	Amount
	2015	$	12,426
	2016	13,865
	2017	471
	2018	15
	2019	75
	Thereafter	68
	Total Unfunded Commitments	$	26,920
	The following table presents tax credits and other tax benefits recognized and amortization expense related to affordable housing for the three months ended March 31, 2015 and 2014.
		Three Months Ended
		March 31,
	(dollars in thousands)	2015		2014
	Effective Yield Method
	Tax credits and other tax benefits recognized	$	3,389	$	2,711
	Amortization Expense in Provision for Income Taxes	1,893		1,402
	There were no sales or impairment losses of LIHTC investments for the three months ended March 31, 2015 and 2014.

Balance_Sheet_Offsetting

Balance Sheet Offsetting	3 Months Ended
	Mar. 31, 2015
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting
	Interest Rate Swap Agreements (“Swap Agreements”)
	The Company enters into swap agreements to facilitate the risk management strategies of a small number of commercial banking customers. The Company mitigates the risk of entering into these agreements by entering into equal and offsetting swap agreements with highly-rated third party financial institutions. The swap agreements are free-standing derivatives and are recorded at fair value in the Company's consolidated statements of condition (asset positions are included in other assets and liability positions are included in other liabilities). The Company is party to master netting arrangements with its financial institution counterparties; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The master netting arrangements provide for a single net settlement of all swap agreements, as well as collateral, in the event of default on, or termination of, any one contract. Collateral, usually in the form of marketable securities, is posted by the counterparty with net liability positions in accordance with contract thresholds. The Company had net liability positions with its financial institution counterparties totaling $16.2 million as of March 31, 2015 and December 31, 2014. The fair value of collateral posted by the Company for these net liability positions is shown in the table below. See Note 11 to the Consolidated Financial Statements for more information.
	Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”)
	The Company enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities.  Under these arrangements, the Company may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Company to repurchase the assets.  As a result, these repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities.  The obligation to repurchase the securities is reflected as a liability in the Company's consolidated statements of condition, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts. As a result, there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities. In addition, as the Company does not enter into reverse repurchase agreements, there is no such offsetting to be done with the repurchase agreements.
	The right of setoff for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Company be in default (e.g., fails to make an interest payment to the counterparty). For private institution repurchase agreements, if the private institution counterparty were to default (e.g., declare bankruptcy), the Company could cancel the repurchase agreement (i.e., cease payment of principal and interest), and attempt collection on the amount of collateral value in excess of the repurchase agreement fair value. The collateral is held by a third party financial institution in the counterparty's custodial account. The counterparty has the right to sell or repledge the investment securities. For government entity repurchase agreements, the collateral is held by the Company in a segregated custodial account under a tri-party agreement.
	The following table presents the assets and liabilities subject to an enforceable master netting arrangement, or repurchase agreements, as of March 31, 2015 and December 31, 2014. The swap agreements we have with our commercial banking customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.
		(i)		(ii)		(iii) =i)-(ii)		(iv)				(v) =iii)-(iv)
		Gross Amounts		Gross Amounts		Net Amounts		Gross Amounts Not Offset in the Statements of Condition
		Recognized in the		Offset in the		Presented in the
		Statements		Statements		Statements
	(dollars in thousands)	of Condition		of Condition		of Condition		Netting		Fair Value of Collateral		Net Amount
								Adjustments		Pledged 1
								per Master
								Netting
								Arrangements
	March 31, 2015
	Assets:
	Interest Rate Swap Agreements:
	Institutional Counterparties	$	—	$	—	$	—	$	—	$	—	$	—
	Liabilities:
	Interest Rate Swap Agreements:
	Institutional Counterparties	16,185		—		16,185		—		—		16,185
	Repurchase Agreements:
	Private Institutions	600,000		—		600,000		—		600,000		—
	Government Entities	72,329		—		72,329		—		72,329		—
		$	672,329	$	—	$	672,329	$	—	$	672,329	$	—
	December 31, 2014
	Assets:
	Interest Rate Swap Agreements:
	Institutional Counterparties	$	28	$	—	$	28	$	28	$	—	$	—
	Liabilities:
	Interest Rate Swap Agreements:
	Institutional Counterparties	16,268		—		16,268		28		—		16,240
	Repurchase Agreements:
	Private Institutions	600,000		—		600,000		—		600,000		—
	Government Entities	88,601		—		88,601		—		88,601		—
		$	688,601	$	—	$	688,601	$	—	$	688,601	$	—
	1 The application of collateral cannot reduce the net amount below zero. Therefore, excess collateral is not reflected in this table. For repurchase agreements with private institutions, the fair value of investment securities pledged was $0.7 billion as of March 31, 2015 and December 31, 2014. For repurchase agreements with government entities, the investment securities pledged to each government entity collectively secure both deposits as well as repurchase agreements. The Company had government entity deposits totaling $1.2 billion and $1.3 billion as of March 31, 2015 and December 31, 2014, respectively. The investment securities pledged as of March 31, 2015 and December 31, 2014 had a fair value of $1.9 billion and $2.1 billion, respectively.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	The following table presents the components of other comprehensive income (loss) for the three months ended March 31, 2015 and 2014:
	(dollars in thousands)	Before Tax				Tax Effect				Net of Tax
	Three Months Ended March 31, 2015
	Net Unrealized Gains (Losses) on Investment Securities:
	Net Unrealized Gains (Losses) Arising During the Period	$	8,711			$	3,435			$	5,276
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
	Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1	30				12				18
	Net Unrealized Gains (Losses) on Investment Securities	8,741				3,447				5,294
	Defined Benefit Plans:
	Amortization of Net Actuarial Losses (Gains)	443				174				269
	Amortization of Prior Service Credit	(81		)		(32		)		(49		)
	Defined Benefit Plans, Net	362				142				220
	Other Comprehensive Income (Loss)	$	9,103			$	3,589			$	5,514
	Three Months Ended March 31, 2014
	Net Unrealized Gains (Losses) on Investment Securities:
	Net Unrealized Gains (Losses) Arising During the Period	$	10,697			$	4,224			$	6,473
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
	Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1	(333		)		(131		)		(202		)
	Net Unrealized Gains (Losses) on Investment Securities	10,364				4,093				6,271
	Defined Benefit Plans:
	Amortization of Net Actuarial Losses (Gains)	339				134				205
	Amortization of Prior Service Credit	(81		)		(32		)		(49		)
	Defined Benefit Plans, Net	258				102				156
	Other Comprehensive Income (Loss)	$	10,622			$	4,195			$	6,427
	1	The amount relates to the amortization/accretion of unrealized net gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
	The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax, for the three months ended March 31, 2015 and 2014:
	(dollars in thousands)		Investment Securities-Available-for-Sale				Investment Securities-Held-to-Maturity				Defined Benefit Plans			Accumulated Other Comprehensive Income (Loss)
	Three Months Ended March 31, 2015
	Balance at Beginning of Period		$	15,984			$	(8,555	)		$	(34,115	)	$	(26,686	)
	Other Comprehensive Income (Loss) Before Reclassifications		5,276				—				—			5,276
	Amounts Reclassified from Accumulated Other		—				18				220			238
	Comprehensive Income (Loss)
	Total Other Comprehensive Income (Loss)		5,276				18				220			5,514
	Balance at End of Period		$	21,260			$	(8,537	)		$	(33,895	)	$	(21,172	)
	Three Months Ended March 31, 2014
	Balance at Beginning of Period		$	(1,300	)		$	(8,129	)		$	(22,394	)	$	(31,823	)
	Other Comprehensive Income (Loss) Before Reclassifications		6,473				—				—			6,473
	Amounts Reclassified from Accumulated Other		—				(202		)		156			(46		)
	Comprehensive Income (Loss)
	Total Other Comprehensive Income (Loss)		6,473				(202		)		156			6,427
	Balance at End of Period		$	5,173			$	(8,331	)		$	(22,238	)	$	(25,396	)
	The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three months ended March 31, 2015 and 2014:
	Details about Accumulated Other	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)1						Affected Line Item in the Statement Where Net Income Is Presented
	Comprehensive Income (Loss) Components
		Three Months Ended March 31,
	(dollars in thousands)	2015			2014
	Amortization of Unrealized Holding Gains (Losses) on	$	(30	)	$	333		Interest Income
	Investment Securities Held-to-Maturity
		12			(131		)	Provision for Income Tax
		(18		)	202			Net of Tax
	Amortization of Defined Benefit Plan Items
	Prior Service Credit 2	81			81
	Net Actuarial Losses 2	(443		)	(339		)
		(362		)	(258		)	Total Before Tax
		142			102			Provision for Income Tax
		(220		)	(156		)	Net of Tax
	Total Reclassifications for the Period	$	(238	)	$	46		Net of Tax
	1	Amounts in parentheses indicate reductions to net income.
	2	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in Salaries and Benefits on the consolidated statements of income (see Note 10 for additional details).

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	There were no adjustments to net income, the numerator, for purposes of computing earnings per share. The following is a reconciliation of the weighted average number of common shares outstanding for computing diluted earnings per share and antidilutive stock options and restricted stock outstanding for the three months ended March 31, 2015 and 2014:
		Three Months Ended
		March 31,
		2015	2014
	Denominator for Basic Earnings Per Share	43,386,402	44,193,267
	Dilutive Effect of Equity Based Awards	211,102	227,082
	Denominator for Diluted Earnings Per Share	43,597,504	44,420,349
	Antidilutive Stock Options and Restricted Stock Outstanding	—	862

Business_Segments

Business Segments	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Business Segments	Business Segments
	The Company’s business segments are defined as Retail Banking, Commercial Banking, Investment Services, and Treasury and Other.  The Company’s internal management accounting process measures the performance of these business segments. This process, which is not necessarily comparable with similar information for any other financial institution, uses various techniques to assign balance sheet and income statement amounts to the business segments, including allocations of income, expense, the provision for credit losses, and capital.  This process is dynamic and requires certain allocations based on judgment and other subjective factors.  Unlike financial accounting, there is no comprehensive authoritative guidance for management accounting that is equivalent to GAAP.  Previously reported results have been reclassified to conform to the current reporting structure.
	The net interest income of the business segments reflects the results of a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics and reflects the allocation of net interest income related to the Company’s overall asset and liability management activities on a proportionate basis.  The basis for the allocation of net interest income is a function of the Company’s assumptions that are subject to change based on changes in current interest rates and market conditions.  Funds transfer pricing also serves to transfer interest rate risk to Treasury.  However, the other business segments have some latitude to retain certain interest rate exposures related to customer pricing decisions within guidelines.
	The provision for credit losses reflects the actual net charge-offs of the business segments.  The amount of the consolidated provision for loan and lease losses is based on the methodology that we use to estimate our consolidated Allowance.  The residual provision for credit losses to arrive at the consolidated provision for credit losses is included in Treasury and Other.
	Noninterest income and expense includes allocations from support units to business units.  These allocations are based on actual usage where practicably calculated or by management’s estimate of such usage.
	The provision for income taxes is allocated to business segments using a 37% effective tax rate. However, the provision for income taxes for our Leasing business unit (included in the Commercial Banking segment) and Auto Leasing portfolio and Pacific Century Life Insurance business unit (both included in the Retail Banking segment) are assigned their actual effective tax rates due to the unique relationship that income taxes have with their products. The residual income tax expense or benefit to arrive at the consolidated effective tax rate is included in Treasury and Other.
	Retail Banking
	Retail Banking offers a broad range of financial products and services to consumers and small businesses.  Loan and lease products include residential mortgage loans, home equity lines of credit, automobile loans and leases, personal lines of credit, installment loans, small business loans and leases, and credit cards.  Deposit products include checking, savings, and time deposit accounts.  Retail Banking also offers retail insurance products.  Products and services from Retail Banking are delivered to customers through 74 branch locations and 456 ATMs throughout Hawaii and the Pacific Islands, e-Bankoh (on-line banking service), a 24-hour customer service center, and a mobile banking service.
	Commercial Banking
	Commercial Banking offers products including corporate banking, commercial real estate loans, commercial lease financing, auto dealer financing, and deposit products.  Commercial lending and deposit products are offered to middle-market and large companies in Hawaii and the Pacific Islands.  Commercial real estate mortgages focus on customers that include investors, developers, and builders predominantly domiciled in Hawaii.  Commercial Banking also includes international banking and provides merchant services to its small business customers.
	Investment Services
	Investment Services includes private banking, trust services, investment management, and institutional investment advisory services.  A significant portion of this segment’s income is derived from fees, which are generally based on the market values of assets under management.  The private banking and personal trust group assists individuals and families in building and preserving their wealth by providing investment, credit, and trust services to high-net-worth individuals.  The investment management group manages portfolios utilizing a variety of investment products. Institutional client services offers investment advice to corporations, government entities, and foundations.  This segment also provides a full service brokerage offering equities, mutual funds, life insurance, and annuity products.
	Treasury and Other
	Treasury consists of corporate asset and liability management activities, including interest rate risk management and a foreign currency exchange business.  This segment’s assets and liabilities (and related interest income and expense) consist of interest-bearing deposits, investment securities, federal funds sold and purchased, government deposits, and short and long-term borrowings.  The primary sources of noninterest income are from bank-owned life insurance, net gains from the sale of investment securities, and foreign exchange income related to customer-driven currency requests from merchants and island visitors.  The net residual effect of the transfer pricing of assets and liabilities is included in Treasury, along with the elimination of intercompany transactions.
	Other organizational units (Technology, Operations, Marketing, Human Resources, Finance, Credit and Risk Management, and Corporate and Regulatory Administration) provide a wide-range of support to the Company’s other income earning segments.  Expenses incurred by these support units are charged to the business segments through an internal cost allocation process.
	Selected business segment financial information as of and for the three months ended March 31, 2015 and 2014 were as follows:
	(dollars in thousands)	Retail Banking			Commercial Banking			Investment Services			Treasury			Consolidated Total
											and Other
	Three Months Ended March 31, 2015
	Net Interest Income	$	48,015		$	35,927		$	2,977		$	9,851		$	96,770
	Provision for Credit Losses	1,723			(464		)	(8		)	(1,251		)	—
	Net Interest Income After Provision for Credit Losses	46,292			36,391			2,985			11,102			96,770
	Noninterest Income	19,073			5,599			14,717			12,918			52,307
	Noninterest Expense	(50,033		)	(18,188		)	(14,444		)	(4,250		)	(86,915		)
	Income Before Provision for Income Taxes	15,332			23,802			3,258			19,770			62,162
	Provision for Income Taxes	(5,447		)	(8,402		)	(1,205		)	(4,666		)	(19,720		)
	Net Income	$	9,885		$	15,400		$	2,053		$	15,104		$	42,442
	Total Assets as of March 31, 2015	$	4,239,641		$	2,910,258		$	188,399		$	7,800,881		$	15,139,179
	Three Months Ended March 31, 2014
	Net Interest Income	$	41,102		$	28,237		$	2,582		$	21,312		$	93,233
	Provision for Credit Losses	1,456			(61		)	(68		)	(1,327		)	—
	Net Interest Income After Provision for Credit Losses	39,646			28,298			2,650			22,639			93,233
	Noninterest Income	19,320			6,260			14,343			4,845			44,768
	Noninterest Expense	(49,096		)	(17,418		)	(14,235		)	(2,798		)	(83,547		)
	Income Before Provision for Income Taxes	9,870			17,140			2,758			24,686			54,454
	Provision for Income Taxes	(3,652		)	(5,879		)	(1,020		)	(5,311		)	(15,862		)
	Net Income	$	6,218		$	11,261		$	1,738		$	19,375		$	38,592
	Total Assets as of March 31, 2014	$	3,679,909		$	2,512,523		$	183,381		$	7,887,305		$	14,263,118

Pension_Plans_and_Postretireme

Pension Plans and Postretirement Benefit Plan	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Pension Plans and Postretirement Benefit Plan	Pension Plans and Postretirement Benefit Plan
	Components of net periodic benefit cost for the Company’s pension plans and the postretirement benefit plan are presented in the following table for the three months ended March 31, 2015 and 2014.
		Pension Benefits						Postretirement Benefits
	(dollars in thousands)	2015			2014			2015			2014
	Three Months Ended March 31,
	Service Cost	$	—		$	—		$	182		$	157
	Interest Cost	1,186			1,242			324			348
	Expected Return on Plan Assets	(1,304		)	(1,275		)	—			—
	Amortization of:
	Prior Service Credit	—			—			(81		)	(81		)
	Net Actuarial Losses (Gains)	443			352			—			(13		)
	Net Periodic Benefit Cost	$	325		$	319		$	425		$	411
	The net periodic benefit cost for the Company’s pension plans and postretirement benefit plan are recorded as a component of salaries and benefits in the consolidated statements of income.  For the three months ended March 31, 2015, the Company contributed $0.1 million to the pension plans and $0.5 million to the postretirement benefit plan.  The Company expects to contribute $0.5 million to the pension plans and $1.4 million to the postretirement benefit plan for the year ending December 31, 2015.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments
	The notional amount and fair value of the Company's derivative financial instruments as of March 31, 2015 and December 31, 2014 were as follows:
			31-Mar-15									31-Dec-14
	(dollars in thousands)	Notional Amount					Fair Value				Notional Amount					Fair Value
	Interest Rate Lock Commitments		$	4,967			$	303				$	2,354			$	152
	Forward Commitments		3,777				(7		)			5,404				(13		)
	Interest Rate Swap Agreements
	Receive Fixed/Pay Variable Swaps		175,728				16,152					183,283				16,206
	Pay Fixed/Receive Variable Swaps		175,728				(16,185		)			183,283				(16,240		)
	Foreign Exchange Contracts		144				(110		)			44,240				(345		)
	The following table presents the Company’s derivative financial instruments, their fair values, and balance sheet location as of March 31, 2015 and December 31, 2014:
	Derivative Financial Instruments	31-Mar-15								31-Dec-14
	Not Designated as Hedging Instruments 1	Asset				Liability				Asset				Liability
	(dollars in thousands)	Derivatives				Derivatives				Derivatives				Derivatives
	Interest Rate Lock Commitments	$	303			$	—			$	152			$	—
	Forward Commitments	1				8				—				13
	Interest Rate Swap Agreements	16,152				16,185				16,262				16,296
	Foreign Exchange Contracts	17				127				101				446
	Total	$	16,473			$	16,320			$	16,515			$	16,755
	1	Asset derivatives are included in other assets and liability derivatives are included in other liabilities in the consolidated statements of condition.
	The following table presents the Company’s derivative financial instruments and the amount and location of the net gains and losses recognized in the consolidated statements of income for the three months ended March 31, 2015 and 2014:
		Location of
	Derivative Financial Instruments	Net Gains (Losses)		Three Months Ended
	Not Designated as Hedging Instruments	Recognized in the		March 31,
	(dollars in thousands)	Statements of Income		2015				2014
	Interest Rate Lock Commitments	Mortgage Banking		$	587			$	1,101
	Forward Commitments	Mortgage Banking		22				(354		)
	Interest Rate Swap Agreements	Other Noninterest Income		—				4
	Foreign Exchange Contracts	Other Noninterest Income		649				799
	Total			$	1,258			$	1,550
	Management has received authorization from the Bank’s Board of Directors to use derivative financial instruments as an end-user in connection with the Bank's risk management activities and to accommodate the needs of the Bank's customers.  As with any financial instrument, derivative financial instruments have inherent risks.  Market risk is defined as the risk of adverse financial impact due to fluctuations in interest rates, foreign exchange rates, and equity prices.  Market risks associated with derivative financial instruments are balanced with the expected returns to enhance earnings performance and shareholder value, while limiting the volatility of each.  The Company uses various processes to monitor its overall market risk exposure, including sensitivity analysis, value-at-risk calculations, and other methodologies.
	Derivative financial instruments are also subject to credit and counterparty risk, which is defined as the risk of financial loss if a borrower or counterparty is either unable or unwilling to repay borrowings or settle transactions in accordance with the underlying contractual terms.  Credit and counterparty risks associated with derivative financial instruments are similar to those relating to traditional financial instruments.  The Company manages derivative credit and counterparty risk by evaluating the creditworthiness of each borrower or counterparty, adhering to the same credit approval process used for commercial lending activities.
	As of March 31, 2015 and December 31, 2014, the Company did not designate any derivative financial instruments as formal hedging relationships.  The Company’s free-standing derivative financial instruments are required to be carried at their fair value on the Company’s consolidated statements of condition.  These financial instruments have been limited to interest rate lock commitments (“IRLCs”), forward commitments, interest rate swap agreements, foreign exchange contracts, and conversion rate swap agreements.
	The Company enters into IRLCs for residential mortgage loans which commit us to lend funds to a potential borrower at a specific interest rate and within a specified period of time.  IRLCs that relate to the origination of mortgage loans that will be held for sale are considered derivative financial instruments under applicable accounting guidance.  Outstanding IRLCs expose the Company to the risk that the price of the mortgage loans underlying the commitments may decline due to increases in mortgage interest rates from inception of the rate lock to the funding of the loan.  To mitigate this risk, the Company utilizes forward commitments as economic hedges against the potential decreases in the values of the loans held for sale.  IRLCs and forward commitments are free-standing derivatives which are carried at fair value with changes recorded in the mortgage banking component of noninterest income in the Company’s consolidated statements of income.
	The Company enters into interest rate swap agreements to facilitate the risk management strategies of a small number of commercial banking customers.  The Company mitigates the risk of entering into these agreements by entering into equal and offsetting interest rate swap agreements with highly rated third party financial institutions.  The interest rate swap agreements are free-standing derivatives and are recorded at fair value in the Company's consolidated statements of condition. Fair value changes are recorded in other noninterest income in the Company’s consolidated statements of income.  The Company is party to master netting arrangements with its financial institution counterparties; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes.  Collateral, usually in the form of marketable securities, is posted by the counterparty with net liability positions in accordance with contract thresholds.  See Note 6 to the Consolidated Financial Statements for more information.
	The Company’s interest rate swap agreements with institutional counterparties contain credit-risk-related contingent features tied to the Company’s debt ratings or capitalization levels.  Under these provisions, if the Company’s debt rating falls below investment grade or if the Company’s capitalization levels fall below stipulated thresholds, certain counterparties may require immediate and ongoing collateralization on interest rate swaps in net liability positions, or may require immediate settlement of the contracts.  As of March 31, 2015, the Company’s debt ratings and capital levels were in excess of these minimum requirements.
	The Company utilizes foreign exchange contracts to offset risks related to transactions executed on behalf of customers.  The foreign exchange contracts are free-standing derivatives which are carried at fair value with changes included in other noninterest income in the Company’s consolidated statements of income.
	Whenever the Company sells Visa Class B restricted shares, the Company enters into a conversion rate swap agreement with the buyer that requires payment to the buyer in the event Visa further reduces the conversion ratio of Class B into Class A unrestricted common shares.  In the event of Visa increasing the conversion ratio, the buyer would be required to make payment to the Company.  This conversion rate swap agreement is usually valued at zero (i.e., no contingent liability recorded) as a drop in the conversion ratio is deemed by the Company to be neither probable nor reasonably estimable.  However, in September 2014, Visa announced a reduction of the conversion ratio. As a result, the Company recorded a $0.1 million liability in September 2014 which represented the amount paid to the buyer in October 2014.  As of March 31, 2015, the conversion rate swap agreement was valued at zero as further reductions to the conversion ratio were deemed neither probable nor reasonably estimable by management. See Note 2 to the Consolidated Financial Statements for more information.

Commitments_Contingencies_and_

Commitments, Contingencies, and Guarantees	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies, and Guarantees	Commitments, Contingencies, and Guarantees
	The Company’s credit commitments as of March 31, 2015 and December 31, 2014 were as follows:
	(dollars in thousands)	March 31,		December 31,
		2015		2014
	Unfunded Commitments to Extend Credit	$	2,439,684	$	2,388,432
	Standby Letters of Credit	46,812		48,157
	Commercial Letters of Credit	17,327		14,130
	Total Credit Commitments	$	2,503,823	$	2,450,719
	Unfunded Commitments to Extend Credit
	Commitments to extend credit are agreements to lend to a customer as long as there is no violation of the terms or conditions established in the contract.  Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee.  Since commitments may expire without being drawn, the total commitment amount does not necessarily represent future cash requirements.
	Standby and Commercial Letters of Credit
	Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party.  Standby letters of credit generally become payable upon the failure of the customer to perform according to the terms of the underlying contract with the third party, while commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and a third party.  The contractual amount of these letters of credit represents the maximum potential future payments guaranteed by the Company.  The Company has recourse against the customer for any amount it is required to pay to a third party under a standby letter of credit, and generally holds cash or deposits as collateral on those standby letters of credit for which collateral is deemed necessary.
	Contingencies
	The Company is subject to various pending and threatened legal proceedings arising out of the normal course of business or operations. On at least a quarterly basis, the Company assesses its liabilities and contingencies in connection with outstanding legal proceedings utilizing the most recent information available. On a case-by-case basis, reserves are established for those legal claims for which it is probable that a loss will be incurred and the amount of such loss can be reasonably estimated. Based on information currently available, management believes that the eventual outcome of these other actions against the Company will not be materially in excess of such amounts accrued by the Company. However, in the event of unexpected future developments, it is possible that the ultimate resolution of those matters may result in a loss that materially exceeds the reserves established by the Company.
	Risks Related to Representation and Warranty Provisions
	The Company sells residential mortgage loans in the secondary market primarily to the Federal National Mortgage Association ("Fannie Mae"). The Company also pools Federal Housing Administration (“FHA”) insured and U.S. Department of Veterans Affairs (“VA”) guaranteed residential mortgage loans for sale to the Government National Mortgage Corporation ("Ginnie Mae"). These pools of FHA-insured and VA-guaranteed residential mortgage loans are securitized by Ginnie Mae. The agreements under which the Company sells residential mortgage loans to Fannie Mae or Ginnie Mae and the insurance or guaranty agreements with FHA and VA contain provisions that include various representations and warranties regarding the origination and characteristics of the residential mortgage loans. Although the specific representations and warranties vary among investors, insurance or guarantee agreements, they typically cover ownership of the loan, validity of the lien securing the loan, the absence of delinquent taxes or liens against the property securing the loan, compliance with loan criteria set forth in the applicable agreement, compliance with applicable federal, state, and local laws, and other matters. As of March 31, 2015, the unpaid principal balance of residential mortgage loans sold by the Company was $2.7 billion. The agreements under which the Company sells residential mortgage loans require delivery of various documents to the investor or its document custodian. Although these loans are primarily sold on a non-recourse basis, the Company may be obligated to repurchase residential mortgage loans or reimburse investors for losses incurred if a loan review reveals that underwriting and documentation standards were potentially not met. Upon receipt of a repurchase request, the Company works with investors or insurers to arrive at a mutually agreeable resolution. Repurchase demands are typically reviewed on an individual loan by loan basis to validate the claims made by the investor or insurer and to determine if a contractually required repurchase event has occurred. The Company manages the risk associated with potential repurchases or other forms of settlement through its underwriting and quality assurance practices and by servicing mortgage loans to meet investor and secondary market standards. For the three months ended March 31, 2015, there were no residential mortgage loans repurchased as a result of the representation and warranty provisions contained in these contracts. As of March 31, 2015, there was one pending repurchase request for $0.3 million related to representation and warranty provisions.
	Risks Relating to Residential Mortgage Loan Servicing Activities
	In addition to servicing loans in the Company's portfolio, substantially all of the loans the Company sells to investors are sold with servicing rights retained. The Company also services loans originated by other mortgage loan originators. As servicer, the Company's primary duties are to: (1) collect payments due from borrowers; (2) advance certain delinquent payments of principal and interest; (3) maintain and administer any hazard, title, or primary mortgage insurance policies relating to the mortgage loans; (4) maintain any required escrow accounts for payment of taxes and insurance and administer escrow payments; and (5) foreclose on defaulted mortgage loans or, to the extent consistent with the documents governing a securitization, consider alternatives to foreclosure, such as loan modifications or short sales. Each agreement under which the Company acts as servicer generally specifies a standard of responsibility for actions taken by the Company in such capacity and provides protection against expenses and liabilities incurred by the Company when acting in compliance with the respective servicing agreements. However, if the Company commits a material breach of obligations as servicer, the Company may be subject to termination if the breach is not cured within a specified period following notice. The standards governing servicing and the possible remedies for violations of such standards vary by investor. These standards and remedies are determined by servicing guides issued by the investors as well as the contract provisions established between the investors and the Company. Remedies could include repurchase of an affected loan. For the three months ended March 31, 2015, there were no loans repurchased related to loan servicing activities. As of March 31, 2015, there were no pending repurchase requests related to loan servicing activities.
	Although to date repurchase requests related to representation and warranty provisions and servicing activities have been limited, it is possible that requests to repurchase mortgage loans may increase in frequency as investors more aggressively pursue all means of recovering losses on their purchased loans. However, as of March 31, 2015, management believes that this exposure is not material due to the historical level of repurchase requests and loss trends and thus has not established a liability for losses related to mortgage loan repurchases. As of March 31, 2015, 99% of the Company's residential mortgage loans serviced for investors were current. The Company maintains ongoing communications with investors and continues to evaluate this exposure by monitoring the level and number of repurchase requests as well as the delinquency rates in the loans sold to investors.

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities
	Fair Value Hierarchy
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for an asset or liability in an orderly transaction between market participants at the measurement date.  GAAP established a fair value hierarchy that prioritizes the use of inputs used in valuation methodologies into the following three levels:
	Level 1:	Inputs to the valuation methodology are quoted prices, unadjusted, for identical assets or liabilities in active markets.  A quoted price in an active market provides the most reliable evidence of fair value and is used to measure fair value whenever available.  A contractually binding sales price also provides reliable evidence of fair value.
	Level 2:	Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets; inputs to the valuation methodology include quoted prices for identical or similar assets or liabilities in markets that are not active; or inputs to the valuation methodology that utilize model-based techniques for which all significant assumptions are observable in the market.
	Level 3:	Inputs to the valuation methodology are unobservable and significant to the fair value measurement; inputs to the valuation methodology that utilize model-based techniques for which significant assumptions are not observable in the market; or inputs to the valuation methodology that require significant management judgment or estimation, some of which may be internally developed.
	Management maximizes the use of observable inputs and minimizes the use of unobservable inputs when determining fair value measurements.  Management reviews and updates the fair value hierarchy classifications of the Company’s assets and liabilities on a quarterly basis.
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	Investment Securities Available-for-Sale
	Fair values of investment securities available-for-sale were primarily measured using information from a third-party pricing service.  This service provides pricing information by utilizing evaluated pricing models supported with market data information.  Standard inputs include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data from market research publications.  Level 1 investment securities are comprised of debt securities issued by the U.S. Treasury.  As quoted prices were available, unadjusted, for identical securities in active markets, these securities were classified as Level 1 measurements.  Level 2 investment securities were primarily comprised of debt securities issued by the Small Business Administration, states and municipalities, corporations, as well as mortgage-backed securities issued by government agencies and government-sponsored enterprises.  Fair values were estimated primarily by obtaining quoted prices for similar assets in active markets or through the use of pricing models.  In cases where there may be limited or less transparent information provided by the Company’s third-party pricing service, fair value may be estimated by the use of secondary pricing services or through the use of non-binding third-party broker quotes.
	On a quarterly basis, management reviews the pricing information received from the Company’s third-party pricing service.  This review process includes a comparison to non-binding third-party broker quotes, as well as a review of market-related conditions impacting the information provided by the Company’s third-party pricing service.  Management primarily identifies investment securities which may have traded in illiquid or inactive markets by identifying instances of a significant decrease in the volume or frequency of trades relative to historical levels, as well as instances of a significant widening of the bid-ask spread in the brokered markets.  Investment securities that are deemed to have been trading in illiquid or inactive markets may require the use of significant unobservable inputs to determine fair value.  As of March 31, 2015 and December 31, 2014, management did not make adjustments to prices provided by the third-party pricing service as a result of illiquid or inactive markets.  On a quarterly basis, management also reviews a sample of securities priced by the Company’s third-party pricing service to review significant assumptions and valuation methodologies used.  Based on this review, management determines whether the current placement of the security in the fair value hierarchy is appropriate or whether transfers may be warranted.  The Company’s third-party pricing service has also established processes for us to submit inquiries regarding quoted prices.  Periodically, we will challenge the quoted prices provided by our third-party pricing service.  The Company’s third-party pricing service will review the inputs to the evaluation in light of the new market data presented by us.  The Company’s third-party pricing service may then affirm the original quoted price or may update the evaluation on a going forward basis.
	Loans Held for Sale
	The fair value of the Company’s residential mortgage loans held for sale was determined based on quoted prices for similar loans in active markets, and therefore, is classified as a Level 2 measurement.
	Mortgage Servicing Rights
	Mortgage servicing rights do not trade in an active market with readily observable market data.  As a result, the Company estimates the fair value of mortgage servicing rights by using a discounted cash flow model to calculate the present value of estimated future net servicing income.  The Company stratifies its mortgage servicing portfolio on the basis of loan type.  The assumptions used in the discounted cash flow model are those that we believe market participants would use in estimating future net servicing income.  Significant assumptions in the valuation of mortgage servicing rights include estimated loan repayment rates, the discount rate, servicing costs, and the timing of cash flows, among other factors.  Mortgage servicing rights are classified as Level 3 measurements due to the use of significant unobservable inputs, as well as significant management judgment and estimation.
	Other Assets
	Other assets recorded at fair value on a recurring basis are primarily comprised of investments related to deferred compensation arrangements.  Quoted prices for these investments, primarily in mutual funds, are available in active markets.  Thus, the Company’s investments related to deferred compensation arrangements are classified as Level 1 measurements in the fair value hierarchy.
	Derivative Financial Instruments
	Derivative financial instruments recorded at fair value on a recurring basis are comprised of interest rate lock commitments (“IRLCs”), forward commitments, interest rate swap agreements, foreign exchange contracts, and Visa Class B to Class A shares conversion rate swap agreements.  The fair values of IRLCs are calculated based on the value of the underlying loan, which in turn is based on quoted prices for similar loans in the secondary market.  However, this value is adjusted by a factor which considers the likelihood that the loan in a locked position will ultimately close.  This factor, the closing ratio, is derived from the Bank’s internal data and is adjusted using significant management judgment.  As such, IRLCs are classified as Level 3 measurements.  Forward commitments are classified as Level 2 measurements as they are primarily based on quoted prices from the secondary market based on the settlement date of the contracts, interpolated or extrapolated, if necessary, to estimate a fair value as of the end of the reporting period.  The fair values of interest rate swap agreements are calculated using a discounted cash flow approach and utilize Level 2 observable inputs such as the LIBOR swap curve, effective date, maturity date, notional amount, and stated interest rate.  In addition, the Company includes in its fair value calculation a credit factor adjustment which is based primarily on management judgment.  Thus, interest rate swap agreements are classified as a Level 3 measurement.  The fair values of foreign exchange contracts are calculated using the Bank’s multi-currency accounting system which utilizes contract specific information such as currency, maturity date, contractual amount, and strike price, along with market data information such as the spot rates of specific currency and yield curves.  Foreign exchange contracts are classified as Level 2 measurements because while they are valued using the Bank’s multi-currency accounting system, significant management judgment or estimation is not required. The fair value of the Visa Class B restricted shares to Class A unrestricted common shares conversion rate swap agreement represents the amount owed by the Company to the buyer of the Visa Class B shares as a result of a reduction of the conversion ratio subsequent to the sales dates. As of March 31, 2015 and December 31, 2014, the conversion rate swap agreement was valued at zero as reductions to the conversion ratio were neither probable nor reasonably estimable by management. This conversion rate swap agreement is classified as a Level 2 measurement. See Note 11 to the Consolidated Financial Statements for more information.
	The Company is exposed to credit risk if borrowers or counterparties fail to perform.  The Company seeks to minimize credit risk through credit approvals, limits, monitoring procedures, and collateral requirements.  The Company generally enters into transactions with borrowers and counterparties that carry high quality credit ratings.  Credit risk associated with borrowers or counterparties as well as the Company’s non-performance risk is factored into the determination of the fair value of derivative financial instruments.
	The table below presents the balances of assets and liabilities measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
		Quoted Prices				Significant				Significant
		in Active				Other				Unobservable
		Markets for				Observable				Inputs
		Identical Assets				Inputs
		or Liabilities
	(dollars in thousands)	(Level 1)				(Level 2)				(Level 3)				Total
	31-Mar-15
	Assets:
	Investment Securities Available-for-Sale
	Debt Securities Issued by the U.S. Treasury	$	61,106			$	294,545			$	—			$	355,651
	and Government Agencies
	Debt Securities Issued by States and Political Subdivisions	—				752,468				—				752,468
	Debt Securities Issued by Corporations	—				285,945				—				285,945
	Mortgage-Backed Securities:
	Residential - Government Agencies	—				427,391				—				427,391
	Residential - U.S. Government-Sponsored Enterprises	—				283,574				—				283,574
	Commercial - Government Agencies	—				166,157				—				166,157
	Total Mortgage-Backed Securities	—				877,122				—				877,122
	Total Investment Securities Available-for-Sale	61,106				2,210,080				—				2,271,186
	Loans Held for Sale	—				1,951				—				1,951
	Mortgage Servicing Rights	—				—				2,277				2,277
	Other Assets	19,577				—				—				19,577
	Derivatives 1	—				18				16,455				16,473
	Total Assets Measured at Fair Value on a	$	80,683			$	2,212,049			$	18,732			$	2,311,464
	Recurring Basis as of March 31, 2015
	Liabilities:
	Derivatives 1	$	—			$	135			$	16,185			$	16,320
	Total Liabilities Measured at Fair Value on a	$	—			$	135			$	16,185			$	16,320
	Recurring Basis as of March 31, 2015
	31-Dec-14
	Assets:
	Investment Securities Available-for-Sale
	Debt Securities Issued by the U.S. Treasury	$	61,271			$	269,987			$	—			$	331,258
	and Government Agencies
	Debt Securities Issued by States and Political Subdivisions	—				743,970				—				743,970
	Debt Securities Issued by Corporations	—				294,833				—				294,833
	Mortgage-Backed Securities:
	Residential - Government Agencies	—				462,436				—				462,436
	Residential - U.S. Government-Sponsored Enterprises	—				278,461				—				278,461
	Commercial - Government Agencies	—				178,232				—				178,232
	Total Mortgage-Backed Securities	—				919,129				—				919,129
	Total Investment Securities Available-for-Sale	61,271				2,227,919				—				2,289,190
	Loans Held for Sale	—				5,136				—				5,136
Mortgage Servicing Rights	—				—				2,604				2,604
Other Assets	18,794				—				—				18,794
Derivatives 1	—				101				16,414				16,515
Total Assets Measured at Fair Value on a	$	80,065			$	2,233,156			$	19,018			$	2,332,239
Recurring Basis as of December 31, 2014
Liabilities:
Derivatives 1	$	—			$	459			$	16,296			$	16,755
Total Liabilities Measured at Fair Value on a	$	—			$	459			$	16,296			$	16,755
Recurring Basis as of December 31, 2014
1	The fair value of each class of derivatives is shown in Note 11 to the Consolidated Financial Statements.
For the three months ended March 31, 2015 and 2014, the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows:
(dollars in thousands)	Mortgage				Net Derivative
	Servicing Rights 1				Assets and
					Liabilities 2
Three Months Ended March 31, 2015
Balance as of January 1, 2015	$	2,604			$	118
Realized and Unrealized Net Gains (Losses):
Included in Net Income	(327		)		587
Transfers to Loans Held for Sale	—				(435		)
Balance as of March 31, 2015	$	2,277			$	270
Total Unrealized Net Gains (Losses) Included in Net Income	$	(251	)		$	270
Related to Assets Still Held as of March 31, 2015
Three Months Ended March 31, 2014
Balance as of January 1, 2014	$	3,826			$	379
Realized and Unrealized Net Gains (Losses):
Included in Net Income	(445		)		1,104
Transfers to Loans Held for Sale	—				(1,194		)
Balance as of March 31, 2014	$	3,381			$	289
Total Unrealized Net Gains (Losses) Included in Net Income	$	(349	)		$	289
Related to Assets Still Held as of March 31, 2014
1	Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of mortgage banking income in the Company’s consolidated statements of income.
2	Realized and unrealized gains and losses related to interest rate lock commitments are reported as a component of mortgage banking income in the Company’s consolidated statements of income.  Realized and unrealized gains and losses related to interest rate swap agreements are reported as a component of other noninterest income in the Company’s consolidated statements of income.
For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2015 and December 31, 2014, the significant unobservable inputs used in the fair value measurements were as follows:
				Significant Unobservable Inputs								Fair Value
				(weighted-average)
(dollars in thousands)		Valuation		Description		Mar. 31,			Dec. 31,			Mar. 31,			Dec. 31,
		Technique				2015			2014			2015			2014
Mortgage Servicing Rights		Discounted Cash Flow		Constant Prepayment Rate 1		12.96	%		11.62	%		$	23,708		$	25,441
				Discount Rate 2		10.32	%		10.61	%
Net Derivative Assets and Liabilities:
Interest Rate Lock Commitments		Pricing Model		Closing Ratio		93.42	%		93.85	%		$	303		$	152
Interest Rate Swap Agreements		Discounted Cash Flow		Credit Factor		0.21	%		0.21	%		$	(33	)	$	(34	)
1	Represents annualized loan repayment rate assumption.
2	Derived from multiple interest rate scenarios that incorporate a spread to the London Interbank Offered Rate swap curve and market volatilities.
The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights are the weighted-average constant prepayment rate and weighted-average discount rate. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement.  Although the constant prepayment rate and the discount rate are not directly interrelated, they generally move in opposite directions of each other.
The Company estimates the fair value of mortgage servicing rights by using a discounted cash flow model to calculate the present value of estimated future net servicing income.  The Company’s Treasury Division enters observable and unobservable inputs into the model to arrive at an estimated fair value.  To assess the reasonableness of the fair value measurement, the Treasury Division performs a back-test by applying the model to historical prepayment data.  The fair value and constant prepayment rate are also compared to forward-looking estimates to assess reasonableness.  The Treasury Division also compares the fair value of the Company’s mortgage servicing rights to a value calculated by an independent third party.  Discussions are held with members from the Treasury, Mortgage Banking, and Controllers Divisions, along with the independent third party to discuss and reconcile the fair value estimates and key assumptions used by the respective parties in arriving at those estimates.  A subcommittee of the Company’s Asset/Liability Management Committee is responsible for providing oversight over the valuation methodology and key assumptions.
The significant unobservable input used in the fair value measurement of the Company’s IRLCs is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close.  Generally, the fair value of an IRLC is positive (negative) if the prevailing interest rate is lower (higher) than the IRLC rate.  Therefore, an increase in the closing ratio (i.e., higher percentage of loans are estimated to close) will increase the gain or loss.  The closing ratio is largely dependent on the loan processing stage that a loan is currently in and the change in prevailing interest rates from the time of the rate lock.  The closing ratio is computed by our secondary marketing system using historical data and the ratio is periodically reviewed by the Company’s Secondary Marketing Department of the Mortgage Banking Division for reasonableness.
The unobservable input used in the fair value measurement of the Company’s interest rate swap agreements is the credit factor.  This factor represents the risk that a counterparty is either unable or unwilling to settle a transaction in accordance with the underlying contractual terms.  A significant increase (decrease) in the credit factor could result in a significantly lower (higher) fair value measurement.  The credit factor is determined by the Treasury Division based on the risk rating assigned to each counterparty in which the Company holds a net asset position.  The Company’s Credit Policy Committee periodically reviews and approves the Expected Default Frequency of the Economic Capital Model for Credit Risk.  The Expected Default Frequency is used as the credit factor for interest rate swap agreements.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
The Company may be required periodically to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP.  These adjustments to fair value usually result from the application of lower-of-cost-or-fair value accounting or impairment write-downs of individual assets.  The following table represents the assets measured at fair value on a nonrecurring basis as of March 31, 2015 and December 31, 2014.
(dollars in thousands)	Fair Value		Net Carrying				Valuation
	Hierarchy		Amount				Allowance
31-Mar-15
Mortgage Servicing Rights - amortization method	Level 3		$	21,366			$	77
Foreclosed Real Estate	Level 3		2,095				354
31-Dec-14
Mortgage Servicing Rights - amortization method	Level 3		$	22,091			$	57
Foreclosed Real Estate	Level 3		2,311				89
The write-down of mortgage servicing rights was primarily due to changes in certain key assumptions used to estimate fair value. As previously mentioned, all of the Company's mortgage servicing rights are classified as Level 3 measurements due to the use of significant unobservable inputs, as well as significant management judgment and estimation. In addition, the Company's foreclosed real estate was reduced by an impairment charge related to the Company's revised fair value estimate, deemed a Level 3 measurement, of one commercial property based on a recent appraisal and management judgment.
Fair Value Option
The Company elected the fair value option for all residential mortgage loans held for sale originated on or after October 1, 2011.  This election allows for a more effective offset of the changes in fair values of the loans held for sale and the derivative financial instruments used to financially hedge them without having to apply complex hedge accounting requirements.  As noted above, the fair value of the Company’s residential mortgage loans held for sale was determined based on quoted prices for similar loans in active markets.
The following table reflects the difference between the aggregate fair value and the aggregate unpaid principal balance of the Company’s residential mortgage loans held for sale as of March 31, 2015 and December 31, 2014.
(dollars in thousands)	Aggregate Fair Value				Aggregate Unpaid Principal					Aggregate Fair Value
										Less Aggregate
										Unpaid Principal
31-Mar-15
Loans Held for Sale	$	1,951				$	1,831				$	120
31-Dec-14
Loans Held for Sale	$	5,136				$	4,740				$	396
Changes in the estimated fair value of residential mortgage loans held for sale are reported as a component of mortgage banking income in the Company’s consolidated statements of income.  For the three months ended March 31, 2015 and 2014, the net gains or losses from the change in fair value of the Company’s residential mortgage loans held for sale were not material.
Financial Instruments Not Recorded at Fair Value on a Recurring Basis
The assumptions used below are expected to approximate those that market participants would use in valuing these financial instruments.
Investment Securities Held-to-Maturity
The fair value of the Company’s investment securities held-to-maturity was primarily measured using information from a third-party pricing service.  Level 1 investment securities are comprised of debt securities issued by the U.S. Treasury as quoted prices were available, unadjusted, for identical securities in active markets.  If quoted prices were not available, fair values were estimated primarily by obtaining quoted prices for similar assets in active markets or through the use of pricing models.  In cases where there may be limited or less transparent information provided by the Company’s third-party pricing service, fair value may be estimated by the use of secondary pricing services or through the use of non-binding third-party broker quotes.
Loans
The fair value of the Company’s loans was estimated by discounting the expected future cash flows using the current interest rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities.  Loans were first segregated by type such as commercial, real estate, and consumer, and were then further segmented into fixed and variable rate and loan quality categories.  Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments.
Time Deposits
The fair values of the Company’s time deposits were estimated using discounted cash flow analyses.  The discount rates used were based on rates currently offered for deposits with similar remaining maturities.  The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value.
Securities Sold Under Agreements to Repurchase
The fair value of the Company’s securities sold under agreements to repurchase was calculated using discounted cash flow analyses, applying discount rates currently offered for new agreements with similar remaining maturities and considering the Company’s non-performance risk.
Other Debt
The fair value of the Company’s other debt was calculated using a discounted cash flow approach and applying discount rates currently offered for new notes with similar remaining maturities and considering the Company’s non-performance risk.
The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments not recorded at fair value on a recurring basis as of March 31, 2015 and December 31, 2014.  This table excludes financial instruments for which the carrying amount approximates fair value.  For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization.  For non-marketable equity securities such as Federal Home Loan Bank and Federal Reserve Bank stock, the carrying amount is a reasonable estimate of fair value as these securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution.  For financial liabilities such as noninterest-bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity.
									Fair Value Measurements
	Carrying								Quoted Prices				Significant			Significant
									in Active				Other			Unobservable
									Markets for				Observable			Inputs
									Identical				Inputs
									Assets or
									Liabilities
(dollars in thousands)	Amount				Fair Value				(Level 1)				(Level 2)			(Level 3)
31-Mar-15
Financial Instruments - Assets
Investment Securities Held-to-Maturity	$	4,306,353			$	4,378,007			$	523,372			$	3,854,635		$	—
Loans 1	6,825,344				7,373,867				—				—			7,373,867
Financial Instruments - Liabilities
Time Deposits	1,308,932				1,312,619				—				1,312,619			—
Securities Sold Under Agreements to Repurchase	672,329				744,649				—				744,649			—
Other Debt 2	163,005				164,269				—				164,269			—
31-Dec-14
Financial Instruments - Assets
Investment Securities Held-to-Maturity	$	4,466,679			$	4,504,495			$	499,616			$	4,004,879		$	—
Loans 1	6,542,719				7,048,757				—				—			7,048,757
Financial Instruments - Liabilities
Time Deposits	1,434,001				1,437,064				—				1,437,064			—
Securities Sold Under Agreements to Repurchase	688,601				758,781				—				758,781			—
Other Debt 2	163,005				163,911				—				163,911			—
1	Net of unearned income and the Allowance.
2	Excludes capitalized lease obligations.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X.  Accordingly, they do not include all of the information and accompanying notes required by GAAP for complete financial statements.  In the opinion of management, the consolidated financial statements reflect normal recurring adjustments necessary for a fair presentation of the results for the interim periods.
	Certain prior period information has been reclassified to conform to the current period presentation.
	These statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.  Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the year ending December 31, 2015.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes.  Actual results may differ from those estimates and such differences could be material to the financial statements.
Accounting Standards Adopted in the Current Year or Pending Adoption	Accounting Standards Adopted in 2015
	In January 2014, the FASB issued ASU No. 2014-01, "Accounting for Investments in Qualified Affordable Housing Projects." ASU No. 2014-01 permits 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. This new guidance also requires new disclosures for all investors in these projects (see Note 5 to the Consolidated Financial Statements). The Company adopted ASU No. 2014-01 effective January 1, 2015. Upon adoption, the guidance must be applied retrospectively to all periods presented. However, entities that used the effective yield method to account for investments in these projects before adoption may continue to do so for these pre-existing investments. Prior to adoption of ASU No. 2014-01, the Company accounted for such investments using the effective yield method and continued to do so for these pre-existing investments after adopting ASU No. 2014-01. The Company expects future investments to meet the criteria required for the proportional amortization method and plans to make such an accounting policy election. There were no new investments made since the adoption of ASU No. 2014-01 on January 1, 2015, and therefore, the adoption of ASU No. 2014-01 did not have a material impact on the Company's Consolidated Financial Statements.
	In January 2014, the FASB issued ASU No. 2014-04, "Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure." The objective of this guidance 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. ASU No. 2014-04 states that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (1) The creditor obtaining legal title to the residential real estate property upon completion of a foreclosure; or (2) The borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, ASU No. 2014-04 requires interim and annual disclosure of both: (1) The amount of foreclosed residential real estate property held by the creditor; and (2) The recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The Company adopted ASU No. 2014-04 effective January 1, 2015. The adoption of ASU No. 2014-04 did not have a material impact on the Company's Consolidated Financial Statements.
	In June 2014, the FASB issued ASU No. 2014-11, "Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The new guidance aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as repurchase financings with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. The amendments in the ASU require a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The amendments in the ASU also require expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The Company adopted the amendments in this ASU effective January 1, 2015. In addition, the expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings is effective for the Company’s reporting period ending June 30, 2015. As of March 31, 2015, all of the Company's repurchase agreements were typical in nature (i.e., not repurchase-to-maturity transactions or repurchase agreements executed as a repurchase financing) and are accounted for as secured borrowings. As such, the adoption of ASU No. 2014-11 did not have a material impact on the Company's Consolidated Financial Statements.
	In June 2014, the FASB issued ASU No. 2014-12, "Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period." The amendments in the ASU require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance in Topic 718, Compensation - Stock Compensation, as it relates to awards with performance conditions that affect vesting to account for such awards. The performance target should not be reflected in estimating the grant-date fair value of the award. However, compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. The Company adopted ASU No. 2014-12 effective January 1, 2015. Entities may apply the amendments in this ASU either: (1) prospectively to all awards granted or modified after the effective date; or (2) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. As of March 31, 2015, the Company did not have any share-based payment awards that included performance targets that could be achieved after the requisite service period. As such, the adoption of ASU No. 2014-12 did not have a material impact on the Company's Consolidated Financial Statements.
	In August 2014, the FASB issued ASU No. 2014-14, “Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure.” The objective of this guidance is to reduce diversity in practice related to how creditors classify government-guaranteed mortgage loans, including FHA or VA guaranteed loans, upon foreclosure. Some creditors reclassify those loans to real estate consistent with other foreclosed loans that do not have guarantees; others reclassify the loans to other receivables. The amendments in this guidance require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) The loan has a government guarantee that is not separable from the loan before foreclosure; (2) At the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (3) At the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The Company adopted ASU No. 2014-14 effective January 1, 2015. The adoption of ASU No. 2014-14 did not have a material impact on the Company's Consolidated Financial Statements.
	Accounting Standards Pending Adoption
	In May 2014, the FASB and the International Accounting Standards Board (the "IASB") jointly issued a comprehensive new revenue recognition standard that will supersede nearly all existing revenue recognition guidance under GAAP and International Financial Reporting Standards ("IFRS"). Previous revenue recognition guidance in GAAP comprised broad revenue recognition concepts together with numerous revenue requirements for particular industries or transactions, which sometimes resulted in different accounting for economically similar transactions. In contrast, IFRS provided limited revenue recognition guidance and, consequently, could be difficult to apply to complex transactions. Accordingly, the FASB and the IASB initiated a joint project to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS that would: (1) Remove inconsistencies and weaknesses in revenue requirements; (2) Provide a more robust framework for addressing revenue issues; (3) Improve comparability of revenue recognition practices across entities, industries, jurisdictions, and capital markets; (4) Provide more useful information to users of financial statements through improved disclosure requirements; and (5) Simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer. To meet those objectives, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies generally will be required to use more judgment and make more estimates than under current guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The standard is effective for public entities for interim and annual reporting periods beginning after December 15, 2016; early adoption is not permitted. For financial reporting purposes, the standard allows for either full retrospective adoption, meaning the standard is applied to all of the periods presented, or modified retrospective adoption, meaning the standard is applied only to the most current period presented in the financial statements with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company is currently evaluating the provisions of ASU No. 2014-09 and will be closely monitoring developments and additional guidance to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements.
	In February 2015, the FASB issued ASU No. 2015-02, “Amendments to the Consolidation Analysis.” This ASU affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. Specifically, the amendments: (1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (“VIEs”) or voting interest entities; (2) Eliminate the presumption that a general partner should consolidate a limited partnership; (3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships; and (4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. ASU No. 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently evaluating the provisions of ASU No. 2015-02 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements.
	In April 2015, the FASB issued ASU No. 2015-05, “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” This ASU provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The new guidance does not change the accounting for a customer’s accounting for service contracts. ASU No. 2015-05 is effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently evaluating the provisions of ASU No. 2015-05 to determine the potential impact the new standard will have on the Company's Consolidated Financial Statements.

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains and losses, and fair value of investment securities	The amortized cost, gross unrealized gains and losses, and fair value of the Company’s investment securities as of March 31, 2015 and December 31, 2014 were as follows:
	(dollars in thousands)	Amortized Cost		Gross			Gross			Fair Value
				Unrealized Gains			Unrealized Losses
	31-Mar-15
	Available-for-Sale:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	350,177	$	5,610		$	(136	)	$	355,651
	Debt Securities Issued by States and Political Subdivisions	727,980		25,068			(580		)	752,468
	Debt Securities Issued by Corporations	288,225		665			(2,945		)	285,945
	Mortgage-Backed Securities:
	Residential - Government Agencies	417,962		10,325			(896		)	427,391
	Residential - U.S. Government-Sponsored Enterprises	279,708		3,866			—			283,574
	Commercial - Government Agencies	172,040		—			(5,883		)	166,157
	Total Mortgage-Backed Securities	869,710		14,191			(6,779		)	877,122
	Total	$	2,236,092	$	45,534		$	(10,440	)	$	2,271,186
	Held-to-Maturity:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	518,849	$	4,592		$	(69	)	$	523,372
	Debt Securities Issued by States and Political Subdivisions	248,674		16,435			—			265,109
	Debt Securities Issued by Corporations	162,867		1,948			(913		)	163,902
	Mortgage-Backed Securities:
	Residential - Government Agencies	2,706,237		50,307			(10,118		)	2,746,426
	Residential - U.S. Government-Sponsored Enterprises	361,273		6,145			—			367,418
	Commercial - Government Agencies	308,453		4,052			(725		)	311,780
	Total Mortgage-Backed Securities	3,375,963		60,504			(10,843		)	3,425,624
	Total	$	4,306,353	$	83,479		$	(11,825	)	$	4,378,007
	31-Dec-14
	Available-for-Sale:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	325,365	$	5,933		$	(40	)	$	331,258
	Debt Securities Issued by States and Political Subdivisions	723,474		21,941			(1,445		)	743,970
	Debt Securities Issued by Corporations	298,272		546			(3,985		)	294,833
	Mortgage-Backed Securities:
	Residential - Government Agencies	452,493		10,986			(1,043		)	462,436
	Residential - U.S. Government-Sponsored Enterprises	276,390		2,262			(191		)	278,461
	Commercial - Government Agencies	186,813		—			(8,581		)	178,232
	Total Mortgage-Backed Securities	915,696		13,248			(9,815		)	919,129
	Total	$	2,262,807	$	41,668		$	(15,285	)	$	2,289,190
	Held-to-Maturity:
	Debt Securities Issued by the U.S. Treasury and Government Agencies	$	498,767	$	2,008		$	(1,159	)	$	499,616
	Debt Securities Issued by States and Political Subdivisions	249,559		15,459			—			265,018
	Debt Securities Issued by Corporations	166,686		109			(3,442		)	163,353
	Mortgage-Backed Securities:
	Residential - Government Agencies	2,862,369		45,407			(20,636		)	2,887,140
	Residential - U.S. Government-Sponsored Enterprises	379,365		3,635			(15		)	382,985
	Commercial - Government Agencies	309,933		241			(3,791		)	306,383
	Total Mortgage-Backed Securities	3,551,667		49,283			(24,442		)	3,576,508
	Total	$	4,466,679	$	66,859		$	(29,043	)	$	4,504,495
Analysis of the contractual maturities of investment securities	The table below presents an analysis of the contractual maturities of the Company’s investment securities as of March 31, 2015.  Debt securities issued by government agencies (Small Business Administration securities) and mortgage-backed securities are disclosed separately in the table below as these investment securities may prepay prior to their scheduled contractual maturity dates.
	(dollars in thousands)	Amortized Cost		Fair Value
	Available-for-Sale:
	Due in One Year or Less	$	90,025	$	90,886
	Due After One Year Through Five Years	349,765		351,442
	Due After Five Years Through Ten Years	541,657		554,898
	Due After Ten Years	95,040		102,294
		1,076,487		1,099,520
	Debt Securities Issued by Government Agencies	289,895		294,544
	Mortgage-Backed Securities:
	Residential - Government Agencies	417,962		427,391
	Residential - U.S. Government-Sponsored Enterprises	279,708		283,574
	Commercial - Government Agencies	172,040		166,157
	Total Mortgage-Backed Securities	869,710		877,122
	Total	$	2,236,092	$	2,271,186
	Held-to-Maturity:
	Due in One Year or Less	$	89,760	$	90,447
	Due After One Year Through Five Years	439,937		444,139
	Due After Five Years Through Ten Years	224,823		232,586
	Due After Ten Years	175,870		185,211
		930,390		952,383
	Mortgage-Backed Securities:
	Residential - Government Agencies	2,706,237		2,746,426
	Residential - U.S. Government-Sponsored Enterprises	361,273		367,418
	Commercial - Government Agencies	308,453		311,780
	Total Mortgage-Backed Securities	3,375,963		3,425,624
	Total	$	4,306,353	$	4,378,007
Schedule of Gains (Losses) on Sale of Investment Securities	The table below presents the gains and losses from the sales of investment securities for the three months ended March 31, 2015 and 2014.
		Three Months Ended
		March 31,
	(dollars in thousands)	2015		2014
	Gross Gains on Sales of Investment Securities	$	10,231	$	2,160
	Gross Losses on Sales of Investment Securities	—		—
	Net Gains on Sales of Investment Securities	$	10,231	$	2,160
Schedule of investment securities in an unrealized loss position	The Company’s investment securities in an unrealized loss position, segregated by continuous length of impairment, were as follows:
		Less Than 12 Months					12 Months or Longer						Total
	(dollars in thousands)	Fair Value		Gross Unrealized Losses			Fair Value			Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	31-Mar-15
	Available-for-Sale:
	Debt Securities Issued by the U.S. Treasury	$	30,513	$	(106	)	$	5,335		$	(30	)	$	35,848	$	(136	)
	and Government Agencies
	Debt Securities Issued by States	98,931		(580		)	—			—			98,931		(580		)
	and Political Subdivisions
	Debt Securities Issued by Corporations	24,260		(740		)	167,931			(2,205		)	192,191		(2,945		)
	Mortgage-Backed Securities:
	Residential - Government Agencies	12,826		(9		)	11,598			(887		)	24,424		(896		)
	Commercial - Government Agencies	—		—			166,157			(5,883		)	166,157		(5,883		)
	Total Mortgage-Backed Securities	12,826		(9		)	177,755			(6,770		)	190,581		(6,779		)
	Total	$	166,530	$	(1,435	)	$	351,021		$	(9,005	)	$	517,551	$	(10,440	)
	Held-to-Maturity:
	Debt Securities Issued by the U.S. Treasury	$	19,980	$	(3	)	$	30,205		$	(66	)	$	50,185	$	(69	)
	and Government Agencies
	Debt Securities Issued by Corporations	—		—			77,905			(913		)	77,905		(913		)
	Mortgage-Backed Securities:
	Residential - Government Agencies	331,511		(1,507		)	502,727			(8,611		)	834,238		(10,118		)
	Commercial - Government Agencies	—		—			103,151			(725		)	103,151		(725		)
	Total Mortgage-Backed Securities	331,511		(1,507		)	605,878			(9,336		)	937,389		(10,843		)
	Total	$	351,491	$	(1,510	)	$	713,988		$	(10,315	)	$	1,065,479	$	(11,825	)
	31-Dec-14
	Available-for-Sale:
	Debt Securities Issued by the U.S. Treasury	$	1,729	$	(2	)	$	5,546		$	(38	)	$	7,275	$	(40	)
	and Government Agencies
	Debt Securities Issued by States	78,068		(305		)	94,543			(1,140		)	172,611		(1,445		)
	and Political Subdivisions
	Debt Securities Issued by Corporations	73,829		(1,171		)	180,335			(2,814		)	254,164		(3,985		)
	Mortgage-Backed Securities:
	Residential - Government Agencies	3,025		(8		)	12,215			(1,035		)	15,240		(1,043		)
	Residential - U.S. Government-Sponsored Enterprises	103,824		(191		)	—			—			103,824		(191		)
	Commercial - Government Agencies	—		—			178,232			(8,581		)	178,232		(8,581		)
	Total Mortgage-Backed Securities	106,849		(199		)	190,447			(9,616		)	297,296		(9,815		)
	Total	$	260,475	$	(1,677	)	$	470,871		$	(13,608	)	$	731,346	$	(15,285	)
	Held-to-Maturity:
	Debt Securities Issued by the U.S. Treasury	$	70,016	$	(134	)	$	144,222		$	(1,025	)	$	214,238	$	(1,159	)
	and Government Agencies
	Debt Securities Issued by Corporations	46,196		(349		)	82,109			(3,093		)	128,305		(3,442		)
	Mortgage-Backed Securities:
	Residential - Government Agencies	280,967		(1,207		)	845,911			(19,429		)	1,126,878		(20,636		)
	Residential - U.S. Government-Sponsored Enterprises	45,754		(15		)	—			—			45,754		(15		)
	Commercial - Government Agencies	124,594		(179		)	171,091			(3,612		)	295,685		(3,791		)
	Total Mortgage-Backed Securities	451,315		(1,401		)	1,017,002			(23,041		)	1,468,317		(24,442		)
	Total	$	567,527	$	(1,884	)	$	1,243,333		$	(27,159	)	$	1,810,860	$	(29,043	)
Schedule of interest income from taxable and non-taxable investment securities	Interest income from taxable and non-taxable investment securities for the three months ended March 31, 2015 and 2014 were as follows:
		Three Months Ended
		March 31,
	(dollars in thousands)	2015		2014
	Taxable	$	29,292	$	33,427
	Non-Taxable	5,313		5,222
	Total Interest Income from Investment Securities	$	34,605	$	38,649
Schedule of carrying value of company's Federal Home Loan Bank and Federal Reserve Bank	As of March 31, 2015, the carrying value of the Company’s Federal Home Loan Bank of Seattle ("FHLB Seattle") and Federal Reserve Bank stock was as follows:
	(dollars in thousands)	March 31,		December 31,
		2015		2014
	Federal Home Loan Bank Stock	$	44,463	$	47,075
	Federal Reserve Bank Stock	19,419		19,299
	Total	$	63,882	$	66,374

Loans_and_Leases_and_the_Allow1

Loans and Leases and the Allowance for Loan and Lease Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Schedule of loan and lease portfolio	The Company’s loan and lease portfolio was comprised of the following as of March 31, 2015 and December 31, 2014:
	(dollars in thousands)	March 31,				December 31,
		2015				2014
	Commercial
	Commercial and Industrial	$	1,141,408			$	1,055,243
	Commercial Mortgage	1,477,902				1,437,513
	Construction	111,381				109,183
	Lease Financing	224,419				226,189
	Total Commercial	2,955,110				2,828,128
	Consumer
	Residential Mortgage	2,699,434				2,571,090
	Home Equity	884,742				866,688
	Automobile	339,686				323,848
	Other 1	299,656				307,835
	Total Consumer	4,223,518				4,069,461
	Total Loans and Leases	$	7,178,628			$	6,897,589
	1	Comprised of other revolving credit, installment, and lease financing.
Schedule of portfolio segment and balance in Allowance disaggregated on the basis of impairment measurement method	The following presents by portfolio segment, the activity in the Allowance for the three months ended March 31, 2015 and 2014.  The following also presents by portfolio segment, the balance in the Allowance disaggregated on the basis of the Company’s impairment measurement method and the related recorded investment in loans and leases as of March 31, 2015 and 2014.
	(dollars in thousands)	Commercial				Consumer				Total
	Three Months Ended March 31, 2015
	Allowance for Loan and Lease Losses:
	Balance at Beginning of Period	$	64,551			$	44,137			$	108,688
	Loans and Leases Charged-Off	(235		)		(3,853		)		(4,088		)
	Recoveries on Loans and Leases Previously Charged-Off	736				2,125				2,861
	Net Loans and Leases Recovered (Charged-Off)	501				(1,728		)		(1,227		)
	Provision for Credit Losses	782				(782		)		—
	Balance at End of Period	$	65,834			$	41,627			$	107,461
	As of March 31, 2015
	Allowance for Loan and Lease Losses:
	Individually Evaluated for Impairment	$	2,212			$	3,534			$	5,746
	Collectively Evaluated for Impairment	63,622				38,093				101,715
	Total	$	65,834			$	41,627			$	107,461
	Recorded Investment in Loans and Leases:
	Individually Evaluated for Impairment	$	26,084			$	39,453			$	65,537
	Collectively Evaluated for Impairment	2,929,026				4,184,065				7,113,091
	Total	$	2,955,110			$	4,223,518			$	7,178,628
	Three Months Ended March 31, 2014
	Allowance for Loan and Lease Losses:
	Balance at Beginning of Period	$	71,446			$	44,008			$	115,454
	Loans and Leases Charged-Off	(819		)		(3,219		)		(4,038		)
	Recoveries on Loans and Leases Previously Charged-Off	941				1,769				2,710
	Net Loans and Leases Recovered (Charged-Off)	122				(1,450		)		(1,328		)
	Provision for Credit Losses	(178		)		178				—
	Balance at End of Period	$	71,390			$	42,736			$	114,126
	As of March 31, 2014
	Allowance for Loan and Lease Losses:
	Individually Evaluated for Impairment	$	8,903			$	3,699			$	12,602
	Collectively Evaluated for Impairment	62,487				39,037				101,524
	Total	$	71,390			$	42,736			$	114,126
	Recorded Investment in Loans and Leases:
	Individually Evaluated for Impairment	$	29,815			$	37,780			$	67,595
	Collectively Evaluated for Impairment	2,542,348				3,599,914				6,142,262
	Total	$	2,572,163			$	3,637,694			$	6,209,857
Schedule of recorded investment in loans and leases by class and by credit quality indicator	The following presents by class and by credit quality indicator, the recorded investment in the Company’s loans and leases as of March 31, 2015 and December 31, 2014.
		31-Mar-15
	(dollars in thousands)	Commercial				Commercial				Construction				Lease				Total
		and Industrial				Mortgage								Financing				Commercial
	Pass	$	1,096,131			$	1,400,719			$	109,608			$	223,942			$	2,830,400
	Special Mention	14,982				33,841				—				91				48,914
	Classified	30,295				43,342				1,773				386				75,796
	Total	$	1,141,408			$	1,477,902			$	111,381			$	224,419			$	2,955,110
	(dollars in thousands)	Residential				Home				Automobile				Other 1				Total
		Mortgage				Equity												Consumer
	Pass	$	2,684,218			$	880,349			$	339,149			$	298,894			$	4,202,610
	Classified	15,216				4,393				537				762				20,908
	Total	$	2,699,434			$	884,742			$	339,686			$	299,656			$	4,223,518
	Total Recorded Investment in Loans and Leases																	$	7,178,628
		31-Dec-14
	(dollars in thousands)	Commercial				Commercial				Construction				Lease				Total
		and Industrial				Mortgage								Financing				Commercial
	Pass	$	1,001,474			$	1,358,812			$	107,381			$	225,783			$	2,693,450
	Special Mention	17,364				45,082				—				17				62,463
	Classified	36,405				33,619				1,802				389				72,215
	Total	$	1,055,243			$	1,437,513			$	109,183			$	226,189			$	2,828,128
	(dollars in thousands)	Residential				Home				Automobile				Other 1				Total
		Mortgage				Equity												Consumer
	Pass	$	2,556,140			$	862,258			$	323,232			$	307,123			$	4,048,753
	Classified	14,950				4,430				616				712				20,708
	Total	$	2,571,090			$	866,688			$	323,848			$	307,835			$	4,069,461
	Total Recorded Investment in Loans and Leases																	$	6,897,589
	1	Comprised of other revolving credit, installment, and lease financing.
Schedule of aging analysis by class of loan and lease portfolio	The following presents by class, an aging analysis of the Company’s loan and lease portfolio as of March 31, 2015 and December 31, 2014.
	(dollars in thousands)	30 - 59				60 - 89				Past Due				Non-				Total				Current		Total		Non-Accrual
		Days				Days				90 Days				Accrual				Past Due and						Loans and		Loans and
		Past Due				Past Due				or More								Non-Accrual						Leases		Leases that
																										are Current 2
	As of March 31, 2015
	Commercial
	Commercial and Industrial	$	2,852			$	180			$	—			$	8,641			$	11,673			$	1,129,735	$	1,141,408	$	7,402
	Commercial Mortgage	1,126				34				—				732				1,892				1,476,010		1,477,902		508
	Construction	—				—				—				—				—				111,381		111,381		—
	Lease Financing	—				—				—				—				—				224,419		224,419		—
	Total Commercial	3,978				214				—				9,373				13,565				2,941,545		2,955,110		7,910
	Consumer
	Residential Mortgage	6,702				2,208				3,914				14,344				27,168				2,672,266		2,699,434		1,515
	Home Equity	3,804				1,378				2,425				2,965				10,572				874,170		884,742		965
	Automobile	6,126				963				537				—				7,626				332,060		339,686		—
	Other 1	2,122				1,200				1,078				—				4,400				295,256		299,656		—
	Total Consumer	18,754				5,749				7,954				17,309				49,766				4,173,752		4,223,518		2,480
	Total	$	22,732			$	5,963			$	7,954			$	26,682			$	63,331			$	7,115,297	$	7,178,628	$	10,390
	As of December 31, 2014
	Commercial
	Commercial and Industrial	$	992			$	356			$	2			$	9,088			$	10,438			$	1,044,805	$	1,055,243	$	7,819
	Commercial Mortgage	458				—				—				745				1,203				1,436,310		1,437,513		—
	Construction	—				—				—				—				—				109,183		109,183		—
	Lease Financing	—				—				—				—				—				226,189		226,189		—
	Total Commercial	1,450				356				2				9,833				11,641				2,816,487		2,828,128		7,819
	Consumer
	Residential Mortgage	4,907				2,107				4,506				14,841				26,361				2,544,729		2,571,090		632
	Home Equity	3,461				2,661				2,596				3,097				11,815				854,873		866,688		375
	Automobile	7,862				1,483				616				—				9,961				313,887		323,848		—
	Other 1	2,416				1,049				941				—				4,406				303,429		307,835		—
	Total Consumer	18,646				7,300				8,659				17,938				52,543				4,016,918		4,069,461		1,007
	Total	$	20,096			$	7,656			$	8,661			$	27,771			$	64,184			$	6,833,405	$	6,897,589	$	8,826
	1	Comprised of other revolving credit, installment, and lease financing.
	2	Represents non-accrual loans that are not past due 30 days or more; however, full payment of principal and interest is still not expected.
Schedule of information related to impaired loans	The following presents by class, information related to impaired loans as of March 31, 2015 and December 31, 2014.
	(dollars in thousands)	Recorded				Unpaid				Related
		Investment				Principal				Allowance for
						Balance				Loan Losses
	31-Mar-15
	Impaired Loans with No Related Allowance Recorded:
	Commercial
	Commercial and Industrial	$	11,798			$	17,102
	Commercial Mortgage	6,407				6,407
	Construction	1,668				1,668
	Total Commercial	19,873				25,177				—
	Total Impaired Loans with No Related Allowance Recorded	$	19,873			$	25,177			$	—
	Impaired Loans with an Allowance Recorded:
	Commercial
	Commercial and Industrial	$	6,211			$	12,811			$	2,212
	Total Commercial	6,211				12,811				2,212
	Consumer
	Residential Mortgage	31,725				37,786				3,408
	Home Equity	1,203				1,203				18
	Automobile	5,546				5,546				76
	Other 1	979				979				32
	Total Consumer	39,453				45,514				3,534
	Total Impaired Loans with an Allowance Recorded	$	45,664			$	58,325			$	5,746
	Impaired Loans:
	Commercial	$	26,084			$	37,988			$	2,212
	Consumer	39,453				45,514				3,534
	Total Impaired Loans	$	65,537			$	83,502			$	5,746
	31-Dec-14
	Impaired Loans with No Related Allowance Recorded:
	Commercial
	Commercial and Industrial	$	9,763			$	15,013			$	—
	Commercial Mortgage	6,480				6,480				—
	Construction	1,689				1,689				—
	Total Commercial	17,932				23,182				—
	Total Impaired Loans with No Related Allowance Recorded	$	17,932			$	23,182			$	—
	Impaired Loans with an Allowance Recorded:
	Commercial
	Commercial and Industrial	$	7,184			$	13,784			$	2,387
	Total Commercial	7,184				13,784				2,387
	Consumer
	Residential Mortgage	32,331				37,989				3,445
	Home Equity	1,012				1,012				16
	Automobile	5,375				5,375				66
	Other 1	913				913				34
	Total Consumer	39,631				45,289				3,561
	Total Impaired Loans with an Allowance Recorded	$	46,815			$	59,073			$	5,948
	Impaired Loans:
	Commercial	$	25,116			$	36,966			$	2,387
	Consumer	39,631				45,289				3,561
	Total Impaired Loans	$	64,747			$	82,255			$	5,948
	1 Comprised of other revolving credit and installment financing.
Schedule of the average recorded investment and interest income recognized on impaired loans	The following presents by class, information related to the average recorded investment and interest income recognized on impaired loans for the three months ended March 31, 2015 and 2014.
		Three Months Ended								Three Months Ended
		31-Mar-15								31-Mar-14
	(dollars in thousands)	Average Recorded				Interest Income				Average Recorded				Interest Income
		Investment				Recognized				Investment				Recognized
	Impaired Loans with No Related Allowance Recorded:
	Commercial
	Commercial and Industrial	$	10,781			$	98			$	12,875			$	92
	Commercial Mortgage	6,444				65				11,036				55
	Construction	1,679				27				1,056				16
	Total Commercial	18,904				190				24,967				163
	Consumer
	Other 1	—				—				6				—
	Total Consumer	—				—				6				—
	Total Impaired Loans with No Related Allowance Recorded	$	18,904			$	190			$	24,973			$	163
	Impaired Loans with an Allowance Recorded:
	Commercial
	Commercial and Industrial	$	6,698			$	26			$	9,176			$	28
	Total Commercial	6,698				26				9,176				28
	Consumer
	Residential Mortgage	32,028				267				31,841				236
	Home Equity	1,108				8				876				5
	Automobile	5,461				104				5,124				107
	Other 1	946				22				367				8
	Total Consumer	39,543				401				38,208				356
	Total Impaired Loans with an Allowance Recorded	$	46,241			$	427			$	47,384			$	384
	Impaired Loans:
	Commercial	$	25,602			$	216			$	34,143			$	191
	Consumer	39,543				401				38,214				356
	Total Impaired Loans	$	65,145			$	617			$	72,357			$	547
	1	Comprised of other revolving credit and installment financing.
Schedule of loans modified in a TDR	The following presents by class, information related to loans modified in a TDR during the three months ended March 31, 2015 and 2014.
		Loans Modified as a TDR for the											Loans Modified as a TDR for the
		Three Months Ended March 31, 2015											Three Months Ended March 31, 2014
					Recorded				Increase in							Recorded				Increase in
	Troubled Debt Restructurings	Number of			Investment				Allowance				Number of			Investment				Allowance
	(dollars in thousands)	Contracts		(as of period end)1				(as of period end)					Contracts		(as of period end)1				(as of period end)
	Commercial
	Commercial and Industrial	17			$	2,687			$	1			18			$	5,883			$	120
	Commercial Mortgage	1			507				—				1			365				—
	Total Commercial	18			3,194				1				19			6,248				120
	Consumer
	Residential Mortgage	5			2,122				61				2			733				23
	Home Equity	2			203				3				1			74				1
	Automobile	35			780				11				37			626				9
	Other 2	22			151				5				10			95				3
	Total Consumer	64			3,256				80				50			1,528				36
	Total	82			$	6,450			$	81			69			$	7,776			$	156
	1	The period end balances reflect all paydowns and charge-offs since the modification date.  TDRs fully paid-off, charged-off, or foreclosed upon by period end are not included.
	2	Comprised of other revolving credit and installment financing.
Schedule of loans modified in a TDR that defaulted during the period, and within twelve months of their modification date by class	The following presents by class, all loans modified in a TDR that defaulted during the three months ended March 31, 2015 and 2014, and within twelve months of their modification date.  A TDR is considered to be in default once it becomes 60 days or more past due following a modification.
		Three Months Ended							Three Months Ended
		31-Mar-15							31-Mar-14
	TDRs that Defaulted During the Period,				Recorded				Recorded
	Within Twelve Months of their Modification Date	Number of			Investment				Number of			Investment
	(dollars in thousands)	Contracts			(as of period end)1				Contracts			(as of period end)1
	Consumer
	Residential Mortgage	1			$	306			2			$	517
	Automobile	7			152				4			53
	Other 2	8			61				3			21
	Total Consumer	16			519				9			591
	Total	16			$	519			9			$	591
	1	The period end balances reflect all paydowns and charge-offs since the modification date.  TDRs fully paid-off, charged-off, or foreclosed upon by period end are not included.
	2	Comprised of other revolving credit and installment financing.

Mortgage_Servicing_Rights_Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2015
Transfers and Servicing of Financial Assets [Abstract]
Analysis of mortgage servicing rights accounted for under the fair value measurement method	For the three months ended March 31, 2015 and 2014, the change in the carrying value of the Company’s mortgage servicing rights accounted for under the fair value measurement method was as follows:
			Three Months Ended
			March 31,
	(dollars in thousands)		2015				2014
	Balance at Beginning of Period		$	2,604			$	3,826
	Change in Fair Value:
	Due to Change in Valuation Assumptions 1		(251		)		(349		)
	Due to Payoffs		(76		)		(96		)
	Total Changes in Fair Value of Mortgage Servicing Rights		(327		)		(445		)
	Balance at End of Period		$	2,277			$	3,381
	1	Principally represents changes in discount rates and loan repayment rate assumptions, mostly due to changes in interest rates.
Analysis of mortgage servicing rights accounted for under the amortization method	For the three months ended March 31, 2015 and 2014, the change in the carrying value of the Company’s mortgage servicing rights accounted for under the amortization method, net of valuation allowance, was as follows:
		Three Months Ended
		March 31,
	(dollars in thousands)	2015				2014
	Balance at Beginning of Period	$	22,091			$	24,297
	Servicing Rights that Resulted From Asset Transfers	134				354
	Amortization	(839		)		(654		)
	Valuation Allowance Provision	(20		)		—
	Balance at End of Period	$	21,366			$	23,997
	Valuation Allowance:
	Balance at Beginning of Period	$	(57	)		$	—
	Valuation Allowance Provision	(20		)		—
	Balance at End of Period	$	(77	)		$	—
	Fair Value of Mortgage Servicing Rights Accounted for
	Under the Amortization Method
	Beginning of Period	$	22,837			$	30,100
	End of Period	$	21,431			$	28,303
Schedule of key data and assumptions used in estimating the fair value of mortgage servicing rights	The key data and assumptions used in estimating the fair value of the Company’s mortgage servicing rights as of March 31, 2015 and December 31, 2014 were as follows:
		March 31,			31-Dec-14
		2015
	Weighted-Average Constant Prepayment Rate 1	12.96	%		11.62	%
	Weighted-Average Life (in years)	5.83			6.28
	Weighted-Average Note Rate	4.27	%		4.28	%
	Weighted-Average Discount Rate 2	10.32	%		10.61	%
	1	Represents annualized loan repayment rate assumption.
	2	Derived from multiple interest rate scenarios that incorporate a spread to the London Interbank Offered Rate swap curve and market volatilities.
Schedule of sensitivity analysis of the fair value of mortgage servicing rights	A sensitivity analysis of the Company’s fair value of mortgage servicing rights to changes in certain key assumptions as of March 31, 2015 and December 31, 2014 is presented in the following table.
	(dollars in thousands)	March 31,				December 31,
		2015				2014
	Constant Prepayment Rate
	Decrease in fair value from 25 basis points (“bps”) adverse change	$	(236	)		$	(265	)
	Decrease in fair value from 50 bps adverse change	(467		)		(524		)
	Discount Rate
	Decrease in fair value from 25 bps adverse change	(224		)		(250		)
	Decrease in fair value from 50 bps adverse change	(445		)		(495		)

Low_Income_Housing_Tax_Credit_1

Low Income Housing Tax Credit Partnerships (Tables)	3 Months Ended
	Mar. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Unfunded Commitments
	As of March 31, 2015, the expected payments for unfunded affordable housing commitments were as follows:
	(dollars in thousands)	Amount
	2015	$	12,426
	2016	13,865
	2017	471
	2018	15
	2019	75
	Thereafter	68
	Total Unfunded Commitments	$	26,920
	The following table presents tax credits and other tax benefits recognized and amortization expense related to affordable housing for the three months ended March 31, 2015 and 2014.
		Three Months Ended
		March 31,
	(dollars in thousands)	2015		2014
	Effective Yield Method
	Tax credits and other tax benefits recognized	$	3,389	$	2,711
	Amortization Expense in Provision for Income Taxes	1,893		1,402

Balance_Sheet_Offsetting_Table

Balance Sheet Offsetting (Tables)	3 Months Ended
	Mar. 31, 2015
Offsetting [Abstract]
Schedule of assets and liabilities subject to an enforceable master netting arrangement	The following table presents the assets and liabilities subject to an enforceable master netting arrangement, or repurchase agreements, as of March 31, 2015 and December 31, 2014. The swap agreements we have with our commercial banking customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.
		(i)		(ii)		(iii) =i)-(ii)		(iv)				(v) =iii)-(iv)
		Gross Amounts		Gross Amounts		Net Amounts		Gross Amounts Not Offset in the Statements of Condition
		Recognized in the		Offset in the		Presented in the
		Statements		Statements		Statements
	(dollars in thousands)	of Condition		of Condition		of Condition		Netting		Fair Value of Collateral		Net Amount
								Adjustments		Pledged 1
								per Master
								Netting
								Arrangements
	March 31, 2015
	Assets:
	Interest Rate Swap Agreements:
	Institutional Counterparties	$	—	$	—	$	—	$	—	$	—	$	—
	Liabilities:
	Interest Rate Swap Agreements:
	Institutional Counterparties	16,185		—		16,185		—		—		16,185
	Repurchase Agreements:
	Private Institutions	600,000		—		600,000		—		600,000		—
	Government Entities	72,329		—		72,329		—		72,329		—
		$	672,329	$	—	$	672,329	$	—	$	672,329	$	—
	December 31, 2014
	Assets:
	Interest Rate Swap Agreements:
	Institutional Counterparties	$	28	$	—	$	28	$	28	$	—	$	—
	Liabilities:
	Interest Rate Swap Agreements:
	Institutional Counterparties	16,268		—		16,268		28		—		16,240
	Repurchase Agreements:
	Private Institutions	600,000		—		600,000		—		600,000		—
	Government Entities	88,601		—		88,601		—		88,601		—
		$	688,601	$	—	$	688,601	$	—	$	688,601	$	—
	1 The application of collateral cannot reduce the net amount below zero. Therefore, excess collateral is not reflected in this table. For repurchase agreements with private institutions, the fair value of investment securities pledged was $0.7 billion as of March 31, 2015 and December 31, 2014. For repurchase agreements with government entities, the investment securities pledged to each government entity collectively secure both deposits as well as repurchase agreements. The Company had government entity deposits totaling $1.2 billion and $1.3 billion as of March 31, 2015 and December 31, 2014, respectively. The investment securities pledged as of March 31, 2015 and December 31, 2014 had a fair value of $1.9 billion and $2.1 billion, respectively.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Components of other comprehensive income	The following table presents the components of other comprehensive income (loss) for the three months ended March 31, 2015 and 2014:
	(dollars in thousands)	Before Tax				Tax Effect				Net of Tax
	Three Months Ended March 31, 2015
	Net Unrealized Gains (Losses) on Investment Securities:
	Net Unrealized Gains (Losses) Arising During the Period	$	8,711			$	3,435			$	5,276
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
	Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1	30				12				18
	Net Unrealized Gains (Losses) on Investment Securities	8,741				3,447				5,294
	Defined Benefit Plans:
	Amortization of Net Actuarial Losses (Gains)	443				174				269
	Amortization of Prior Service Credit	(81		)		(32		)		(49		)
	Defined Benefit Plans, Net	362				142				220
	Other Comprehensive Income (Loss)	$	9,103			$	3,589			$	5,514
	Three Months Ended March 31, 2014
	Net Unrealized Gains (Losses) on Investment Securities:
	Net Unrealized Gains (Losses) Arising During the Period	$	10,697			$	4,224			$	6,473
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
	Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1	(333		)		(131		)		(202		)
	Net Unrealized Gains (Losses) on Investment Securities	10,364				4,093				6,271
	Defined Benefit Plans:
	Amortization of Net Actuarial Losses (Gains)	339				134				205
	Amortization of Prior Service Credit	(81		)		(32		)		(49		)
	Defined Benefit Plans, Net	258				102				156
	Other Comprehensive Income (Loss)	$	10,622			$	4,195			$	6,427
	1	The amount relates to the amortization/accretion of unrealized net gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
Schedule of accumulated other comprehensive income (loss)	The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax, for the three months ended March 31, 2015 and 2014:
	(dollars in thousands)		Investment Securities-Available-for-Sale				Investment Securities-Held-to-Maturity				Defined Benefit Plans			Accumulated Other Comprehensive Income (Loss)
	Three Months Ended March 31, 2015
	Balance at Beginning of Period		$	15,984			$	(8,555	)		$	(34,115	)	$	(26,686	)
	Other Comprehensive Income (Loss) Before Reclassifications		5,276				—				—			5,276
	Amounts Reclassified from Accumulated Other		—				18				220			238
	Comprehensive Income (Loss)
	Total Other Comprehensive Income (Loss)		5,276				18				220			5,514
	Balance at End of Period		$	21,260			$	(8,537	)		$	(33,895	)	$	(21,172	)
	Three Months Ended March 31, 2014
	Balance at Beginning of Period		$	(1,300	)		$	(8,129	)		$	(22,394	)	$	(31,823	)
	Other Comprehensive Income (Loss) Before Reclassifications		6,473				—				—			6,473
	Amounts Reclassified from Accumulated Other		—				(202		)		156			(46		)
	Comprehensive Income (Loss)
	Total Other Comprehensive Income (Loss)		6,473				(202		)		156			6,427
	Balance at End of Period		$	5,173			$	(8,331	)		$	(22,238	)	$	(25,396	)
Reclassification out of accumulated other comprehensive income	The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three months ended March 31, 2015 and 2014:
	Details about Accumulated Other	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)1						Affected Line Item in the Statement Where Net Income Is Presented
	Comprehensive Income (Loss) Components
		Three Months Ended March 31,
	(dollars in thousands)	2015			2014
	Amortization of Unrealized Holding Gains (Losses) on	$	(30	)	$	333		Interest Income
	Investment Securities Held-to-Maturity
		12			(131		)	Provision for Income Tax
		(18		)	202			Net of Tax
	Amortization of Defined Benefit Plan Items
	Prior Service Credit 2	81			81
	Net Actuarial Losses 2	(443		)	(339		)
		(362		)	(258		)	Total Before Tax
		142			102			Provision for Income Tax
		(220		)	(156		)	Net of Tax
	Total Reclassifications for the Period	$	(238	)	$	46		Net of Tax
	1	Amounts in parentheses indicate reductions to net income.
	2	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in Salaries and Benefits on the consolidated statements of income (see Note 10 for additional details).

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Reconciliation of the weighted average number of common shares outstanding for computing diluted earnings per share and antidilutive stock options and restricted stock outstanding	The following is a reconciliation of the weighted average number of common shares outstanding for computing diluted earnings per share and antidilutive stock options and restricted stock outstanding for the three months ended March 31, 2015 and 2014:
		Three Months Ended
		March 31,
		2015	2014
	Denominator for Basic Earnings Per Share	43,386,402	44,193,267
	Dilutive Effect of Equity Based Awards	211,102	227,082
	Denominator for Diluted Earnings Per Share	43,597,504	44,420,349
	Antidilutive Stock Options and Restricted Stock Outstanding	—	862

Business_Segments_Tables

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Selected business segment financial information	Selected business segment financial information as of and for the three months ended March 31, 2015 and 2014 were as follows:
	(dollars in thousands)	Retail Banking			Commercial Banking			Investment Services			Treasury			Consolidated Total
											and Other
	Three Months Ended March 31, 2015
	Net Interest Income	$	48,015		$	35,927		$	2,977		$	9,851		$	96,770
	Provision for Credit Losses	1,723			(464		)	(8		)	(1,251		)	—
	Net Interest Income After Provision for Credit Losses	46,292			36,391			2,985			11,102			96,770
	Noninterest Income	19,073			5,599			14,717			12,918			52,307
	Noninterest Expense	(50,033		)	(18,188		)	(14,444		)	(4,250		)	(86,915		)
	Income Before Provision for Income Taxes	15,332			23,802			3,258			19,770			62,162
	Provision for Income Taxes	(5,447		)	(8,402		)	(1,205		)	(4,666		)	(19,720		)
	Net Income	$	9,885		$	15,400		$	2,053		$	15,104		$	42,442
	Total Assets as of March 31, 2015	$	4,239,641		$	2,910,258		$	188,399		$	7,800,881		$	15,139,179
	Three Months Ended March 31, 2014
	Net Interest Income	$	41,102		$	28,237		$	2,582		$	21,312		$	93,233
	Provision for Credit Losses	1,456			(61		)	(68		)	(1,327		)	—
	Net Interest Income After Provision for Credit Losses	39,646			28,298			2,650			22,639			93,233
	Noninterest Income	19,320			6,260			14,343			4,845			44,768
	Noninterest Expense	(49,096		)	(17,418		)	(14,235		)	(2,798		)	(83,547		)
	Income Before Provision for Income Taxes	9,870			17,140			2,758			24,686			54,454
	Provision for Income Taxes	(3,652		)	(5,879		)	(1,020		)	(5,311		)	(15,862		)
	Net Income	$	6,218		$	11,261		$	1,738		$	19,375		$	38,592
	Total Assets as of March 31, 2014	$	3,679,909		$	2,512,523		$	183,381		$	7,887,305		$	14,263,118

Pension_Plans_and_Postretireme1

Pension Plans and Postretirement Benefit Plan (Tables)	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of components of net periodic benefit cost	Components of net periodic benefit cost for the Company’s pension plans and the postretirement benefit plan are presented in the following table for the three months ended March 31, 2015 and 2014.
		Pension Benefits						Postretirement Benefits
	(dollars in thousands)	2015			2014			2015			2014
	Three Months Ended March 31,
	Service Cost	$	—		$	—		$	182		$	157
	Interest Cost	1,186			1,242			324			348
	Expected Return on Plan Assets	(1,304		)	(1,275		)	—			—
	Amortization of:
	Prior Service Credit	—			—			(81		)	(81		)
	Net Actuarial Losses (Gains)	443			352			—			(13		)
	Net Periodic Benefit Cost	$	325		$	319		$	425		$	411

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of the notional amount and fair value of the derivative financial instruments	The notional amount and fair value of the Company's derivative financial instruments as of March 31, 2015 and December 31, 2014 were as follows:
			31-Mar-15									31-Dec-14
	(dollars in thousands)	Notional Amount					Fair Value				Notional Amount					Fair Value
	Interest Rate Lock Commitments		$	4,967			$	303				$	2,354			$	152
	Forward Commitments		3,777				(7		)			5,404				(13		)
	Interest Rate Swap Agreements
	Receive Fixed/Pay Variable Swaps		175,728				16,152					183,283				16,206
	Pay Fixed/Receive Variable Swaps		175,728				(16,185		)			183,283				(16,240		)
	Foreign Exchange Contracts		144				(110		)			44,240				(345		)
Derivative financial instruments, their fair values, and balance sheet location	The following table presents the Company’s derivative financial instruments, their fair values, and balance sheet location as of March 31, 2015 and December 31, 2014:
	Derivative Financial Instruments	31-Mar-15								31-Dec-14
	Not Designated as Hedging Instruments 1	Asset				Liability				Asset				Liability
	(dollars in thousands)	Derivatives				Derivatives				Derivatives				Derivatives
	Interest Rate Lock Commitments	$	303			$	—			$	152			$	—
	Forward Commitments	1				8				—				13
	Interest Rate Swap Agreements	16,152				16,185				16,262				16,296
	Foreign Exchange Contracts	17				127				101				446
	Total	$	16,473			$	16,320			$	16,515			$	16,755
	1	Asset derivatives are included in other assets and liability derivatives are included in other liabilities in the consolidated statements of condition.
Derivative financial instruments and the amount and location of the net gains or losses recognized in the statements of income	The following table presents the Company’s derivative financial instruments and the amount and location of the net gains and losses recognized in the consolidated statements of income for the three months ended March 31, 2015 and 2014:
		Location of
	Derivative Financial Instruments	Net Gains (Losses)		Three Months Ended
	Not Designated as Hedging Instruments	Recognized in the		March 31,
	(dollars in thousands)	Statements of Income		2015				2014
	Interest Rate Lock Commitments	Mortgage Banking		$	587			$	1,101
	Forward Commitments	Mortgage Banking		22				(354		)
	Interest Rate Swap Agreements	Other Noninterest Income		—				4
	Foreign Exchange Contracts	Other Noninterest Income		649				799
	Total			$	1,258			$	1,550

Commitments_Contingencies_and_1

Commitments, Contingencies, and Guarantees (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Credit commitments	The Company’s credit commitments as of March 31, 2015 and December 31, 2014 were as follows:
	(dollars in thousands)	March 31,		December 31,
		2015		2014
	Unfunded Commitments to Extend Credit	$	2,439,684	$	2,388,432
	Standby Letters of Credit	46,812		48,157
	Commercial Letters of Credit	17,327		14,130
	Total Credit Commitments	$	2,503,823	$	2,450,719

Fair_Value_of_Assets_and_Liabi1

Fair Value of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Balances of assets and liabilities measured at fair value on a recurring basis	The table below presents the balances of assets and liabilities measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:
		Quoted Prices				Significant				Significant
		in Active				Other				Unobservable
		Markets for				Observable				Inputs
		Identical Assets				Inputs
		or Liabilities
	(dollars in thousands)	(Level 1)				(Level 2)				(Level 3)				Total
	31-Mar-15
	Assets:
	Investment Securities Available-for-Sale
	Debt Securities Issued by the U.S. Treasury	$	61,106			$	294,545			$	—			$	355,651
	and Government Agencies
	Debt Securities Issued by States and Political Subdivisions	—				752,468				—				752,468
	Debt Securities Issued by Corporations	—				285,945				—				285,945
	Mortgage-Backed Securities:
	Residential - Government Agencies	—				427,391				—				427,391
	Residential - U.S. Government-Sponsored Enterprises	—				283,574				—				283,574
	Commercial - Government Agencies	—				166,157				—				166,157
	Total Mortgage-Backed Securities	—				877,122				—				877,122
	Total Investment Securities Available-for-Sale	61,106				2,210,080				—				2,271,186
	Loans Held for Sale	—				1,951				—				1,951
	Mortgage Servicing Rights	—				—				2,277				2,277
	Other Assets	19,577				—				—				19,577
	Derivatives 1	—				18				16,455				16,473
	Total Assets Measured at Fair Value on a	$	80,683			$	2,212,049			$	18,732			$	2,311,464
	Recurring Basis as of March 31, 2015
	Liabilities:
	Derivatives 1	$	—			$	135			$	16,185			$	16,320
	Total Liabilities Measured at Fair Value on a	$	—			$	135			$	16,185			$	16,320
	Recurring Basis as of March 31, 2015
	31-Dec-14
	Assets:
	Investment Securities Available-for-Sale
	Debt Securities Issued by the U.S. Treasury	$	61,271			$	269,987			$	—			$	331,258
	and Government Agencies
	Debt Securities Issued by States and Political Subdivisions	—				743,970				—				743,970
	Debt Securities Issued by Corporations	—				294,833				—				294,833
	Mortgage-Backed Securities:
	Residential - Government Agencies	—				462,436				—				462,436
	Residential - U.S. Government-Sponsored Enterprises	—				278,461				—				278,461
	Commercial - Government Agencies	—				178,232				—				178,232
	Total Mortgage-Backed Securities	—				919,129				—				919,129
	Total Investment Securities Available-for-Sale	61,271				2,227,919				—				2,289,190
	Loans Held for Sale	—				5,136				—				5,136
	Mortgage Servicing Rights	—				—				2,604				2,604
	Other Assets	18,794				—				—				18,794
	Derivatives 1	—				101				16,414				16,515
	Total Assets Measured at Fair Value on a	$	80,065			$	2,233,156			$	19,018			$	2,332,239
	Recurring Basis as of December 31, 2014
	Liabilities:
	Derivatives 1	$	—			$	459			$	16,296			$	16,755
	Total Liabilities Measured at Fair Value on a	$	—			$	459			$	16,296			$	16,755
	Recurring Basis as of December 31, 2014
	1	The fair value of each class of derivatives is shown in Note 11 to the Consolidated Financial Statements.
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis	For the three months ended March 31, 2015 and 2014, the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows:
	(dollars in thousands)	Mortgage				Net Derivative
		Servicing Rights 1				Assets and
						Liabilities 2
	Three Months Ended March 31, 2015
	Balance as of January 1, 2015	$	2,604			$	118
	Realized and Unrealized Net Gains (Losses):
	Included in Net Income	(327		)		587
	Transfers to Loans Held for Sale	—				(435		)
	Balance as of March 31, 2015	$	2,277			$	270
	Total Unrealized Net Gains (Losses) Included in Net Income	$	(251	)		$	270
	Related to Assets Still Held as of March 31, 2015
	Three Months Ended March 31, 2014
	Balance as of January 1, 2014	$	3,826			$	379
	Realized and Unrealized Net Gains (Losses):
	Included in Net Income	(445		)		1,104
	Transfers to Loans Held for Sale	—				(1,194		)
	Balance as of March 31, 2014	$	3,381			$	289
	Total Unrealized Net Gains (Losses) Included in Net Income	$	(349	)		$	289
	Related to Assets Still Held as of March 31, 2014
	1	Realized and unrealized gains and losses related to mortgage servicing rights are reported as a component of mortgage banking income in the Company’s consolidated statements of income.
	2	Realized and unrealized gains and losses related to interest rate lock commitments are reported as a component of mortgage banking income in the Company’s consolidated statements of income.  Realized and unrealized gains and losses related to interest rate swap agreements are reported as a component of other noninterest income in the Company’s consolidated statements of income.
Summary of the significant unobservable inputs	For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2015 and December 31, 2014, the significant unobservable inputs used in the fair value measurements were as follows:
					Significant Unobservable Inputs								Fair Value
					(weighted-average)
	(dollars in thousands)		Valuation		Description		Mar. 31,			Dec. 31,			Mar. 31,			Dec. 31,
			Technique				2015			2014			2015			2014
	Mortgage Servicing Rights		Discounted Cash Flow		Constant Prepayment Rate 1		12.96	%		11.62	%		$	23,708		$	25,441
					Discount Rate 2		10.32	%		10.61	%
	Net Derivative Assets and Liabilities:
	Interest Rate Lock Commitments		Pricing Model		Closing Ratio		93.42	%		93.85	%		$	303		$	152
	Interest Rate Swap Agreements		Discounted Cash Flow		Credit Factor		0.21	%		0.21	%		$	(33	)	$	(34	)
	1	Represents annualized loan repayment rate assumption.
	2	Derived from multiple interest rate scenarios that incorporate a spread to the London Interbank Offered Rate swap curve and market volatilities.
Assets and liabilities measured at fair value on a nonrecurring basis	The following table represents the assets measured at fair value on a nonrecurring basis as of March 31, 2015 and December 31, 2014.
	(dollars in thousands)	Fair Value		Net Carrying				Valuation
		Hierarchy		Amount				Allowance
	31-Mar-15
	Mortgage Servicing Rights - amortization method	Level 3		$	21,366			$	77
	Foreclosed Real Estate	Level 3		2,095				354
	31-Dec-14
	Mortgage Servicing Rights - amortization method	Level 3		$	22,091			$	57
	Foreclosed Real Estate	Level 3		2,311				89
Schedule of difference between the aggregate fair value and the aggregate unpaid principal balance of the Company's residential mortgage loans held for sale	The following table reflects the difference between the aggregate fair value and the aggregate unpaid principal balance of the Company’s residential mortgage loans held for sale as of March 31, 2015 and December 31, 2014.
	(dollars in thousands)	Aggregate Fair Value				Aggregate Unpaid Principal					Aggregate Fair Value
											Less Aggregate
											Unpaid Principal
	31-Mar-15
	Loans Held for Sale	$	1,951				$	1,831				$	120
	31-Dec-14
	Loans Held for Sale	$	5,136				$	4,740				$	396
Schedule of carrying amount, fair value, and fair value hierarchy of financial instruments	The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments not recorded at fair value on a recurring basis as of March 31, 2015 and December 31, 2014.  This table excludes financial instruments for which the carrying amount approximates fair value.  For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization.  For non-marketable equity securities such as Federal Home Loan Bank and Federal Reserve Bank stock, the carrying amount is a reasonable estimate of fair value as these securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution or to another member institution.  For financial liabilities such as noninterest-bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity.
										Fair Value Measurements
		Carrying								Quoted Prices				Significant			Significant
										in Active				Other			Unobservable
										Markets for				Observable			Inputs
										Identical				Inputs
										Assets or
										Liabilities
	(dollars in thousands)	Amount				Fair Value				(Level 1)				(Level 2)			(Level 3)
	31-Mar-15
	Financial Instruments - Assets
	Investment Securities Held-to-Maturity	$	4,306,353			$	4,378,007			$	523,372			$	3,854,635		$	—
	Loans 1	6,825,344				7,373,867				—				—			7,373,867
	Financial Instruments - Liabilities
	Time Deposits	1,308,932				1,312,619				—				1,312,619			—
	Securities Sold Under Agreements to Repurchase	672,329				744,649				—				744,649			—
	Other Debt 2	163,005				164,269				—				164,269			—
	31-Dec-14
	Financial Instruments - Assets
	Investment Securities Held-to-Maturity	$	4,466,679			$	4,504,495			$	499,616			$	4,004,879		$	—
	Loans 1	6,542,719				7,048,757				—				—			7,048,757
	Financial Instruments - Liabilities
	Time Deposits	1,434,001				1,437,064				—				1,437,064			—
	Securities Sold Under Agreements to Repurchase	688,601				758,781				—				758,781			—
	Other Debt 2	163,005				163,911				—				163,911			—
	1	Net of unearned income and the Allowance.
	2	Excludes capitalized lease obligations.

Investment_Securities_Amort_co

Investment Securities (Amort cost, gross unrealized gains/losses, and fair value) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Available-for-Sale:
Amortized Cost	$2,236,092	$2,262,807
Gross Unrealized Gains	45,534	41,668
Gross Unrealized Losses	-10,440	-15,285
Available-for-Sale	2,271,186	2,289,190
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	4,306,353	4,466,679
Gross Unrealized Gains	83,479	66,859
Gross Unrealized Losses	-11,825	-29,043
Held-to-Maturity Securities, Fair Value	4,378,007	4,504,495
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Amortized Cost	350,177	325,365
Gross Unrealized Gains	5,610	5,933
Gross Unrealized Losses	-136	-40
Available-for-Sale	355,651	331,258
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	518,849	498,767
Gross Unrealized Gains	4,592	2,008
Gross Unrealized Losses	-69	-1,159
Held-to-Maturity Securities, Fair Value	523,372	499,616
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Amortized Cost	727,980	723,474
Gross Unrealized Gains	25,068	21,941
Gross Unrealized Losses	-580	-1,445
Available-for-Sale	752,468	743,970
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	248,674	249,559
Gross Unrealized Gains	16,435	15,459
Gross Unrealized Losses	0	0
Held-to-Maturity Securities, Fair Value	265,109	265,018
Debt Securities Issued by Corporations
Available-for-Sale:
Amortized Cost	288,225	298,272
Gross Unrealized Gains	665	546
Gross Unrealized Losses	-2,945	-3,985
Available-for-Sale	285,945	294,833
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	162,867	166,686
Gross Unrealized Gains	1,948	109
Gross Unrealized Losses	-913	-3,442
Held-to-Maturity Securities, Fair Value	163,902	163,353
Mortgage-Backed Securities
Available-for-Sale:
Amortized Cost	869,710	915,696
Gross Unrealized Gains	14,191	13,248
Gross Unrealized Losses	-6,779	-9,815
Available-for-Sale	877,122	919,129
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	3,375,963	3,551,667
Gross Unrealized Gains	60,504	49,283
Gross Unrealized Losses	-10,843	-24,442
Held-to-Maturity Securities, Fair Value	3,425,624	3,576,508
Residential - Government Agencies
Available-for-Sale:
Amortized Cost	417,962	452,493
Gross Unrealized Gains	10,325	10,986
Gross Unrealized Losses	-896	-1,043
Available-for-Sale	427,391	462,436
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	2,706,237	2,862,369
Gross Unrealized Gains	50,307	45,407
Gross Unrealized Losses	-10,118	-20,636
Held-to-Maturity Securities, Fair Value	2,746,426	2,887,140
Residential - U.S. Government Sponsored Enterprises
Available-for-Sale:
Amortized Cost	279,708	276,390
Gross Unrealized Gains	3,866	2,262
Gross Unrealized Losses	0	-191
Available-for-Sale	283,574	278,461
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	361,273	379,365
Gross Unrealized Gains	6,145	3,635
Gross Unrealized Losses	0	-15
Held-to-Maturity Securities, Fair Value	367,418	382,985
Commercial - Government Agencies
Available-for-Sale:
Amortized Cost	172,040	186,813
Gross Unrealized Gains	0	0
Gross Unrealized Losses	-5,883	-8,581
Available-for-Sale	166,157	178,232
Held-to-Maturity:
Held-to-maturity Securities, Amortized Cost	308,453	309,933
Gross Unrealized Gains	4,052	241
Gross Unrealized Losses	-725	-3,791
Held-to-Maturity Securities, Fair Value	$311,780	$306,383

Investment_Securities_by_Matur

Investment Securities (by Maturity buckets and narrative) (Details 2) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity[Abstract]
Due in One Year or Less	$90,025,000
Due After One Year Through Five Years	349,765,000
Due After Five Years Through Ten Years	541,657,000
Due After Ten Years	95,040,000
Amortized Cost, Total	1,076,487,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Due in One Year or Less	90,886,000
Due After One Year Through Five Years	351,442,000
Due After Five Years Through Ten Years	554,898,000
Due After Ten Years	102,294,000
Fair Value, Total	1,099,520,000
Available-for-sale Securities, Amortized Cost	2,236,092,000	2,262,807,000
Available-for-sale Securities, Fair Value	2,271,186,000	2,289,190,000
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract]
Due in One Year or Less	89,760,000
Due After One Year Through Five Years	439,937,000
Due After Five Years Through Ten Years	224,823,000
Due After Ten Years	175,870,000
Amortized Cost, Total	930,390,000
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Due in One Year or Less	90,447,000
Due After One Year Through Five Years	444,139,000
Due After Five Years Through Ten Years	232,586,000
Due After Ten Years	185,211,000
Fair Value, Total	952,383,000
Held-to-maturity Securities, Amortized Cost	4,306,353,000	4,466,679,000
Held-to-Maturity Securities, Fair Value	4,378,007,000	4,504,495,000
Carrying value of investment securities which are pledged	2,600,000,000	2,800,000,000
Debt Securities Issued by Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	289,895,000
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	294,544,000
Mortgage-Backed Securities
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	869,710,000
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	877,122,000
Available-for-sale Securities, Amortized Cost	869,710,000	915,696,000
Available-for-sale Securities, Fair Value	877,122,000	919,129,000
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-maturity Securities, Debt Maturities, Debt Maturities, without Single Maturity Date, Amortized Cost	3,375,963,000
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	3,425,624,000
Held-to-maturity Securities, Amortized Cost	3,375,963,000	3,551,667,000
Held-to-Maturity Securities, Fair Value	3,425,624,000	3,576,508,000
Residential - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	417,962,000
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	427,391,000
Available-for-sale Securities, Amortized Cost	417,962,000	452,493,000
Available-for-sale Securities, Fair Value	427,391,000	462,436,000
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-maturity Securities, Debt Maturities, Debt Maturities, without Single Maturity Date, Amortized Cost	2,706,237,000
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	2,746,426,000
Held-to-maturity Securities, Amortized Cost	2,706,237,000	2,862,369,000
Held-to-Maturity Securities, Fair Value	2,746,426,000	2,887,140,000
Residential - U.S. Government Sponsored Enterprises
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	279,708,000
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	283,574,000
Available-for-sale Securities, Amortized Cost	279,708,000	276,390,000
Available-for-sale Securities, Fair Value	283,574,000	278,461,000
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-maturity Securities, Debt Maturities, Debt Maturities, without Single Maturity Date, Amortized Cost	361,273,000
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	367,418,000
Held-to-maturity Securities, Amortized Cost	361,273,000	379,365,000
Held-to-Maturity Securities, Fair Value	367,418,000	382,985,000
Commercial - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	172,040,000
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	166,157,000
Available-for-sale Securities, Amortized Cost	172,040,000	186,813,000
Available-for-sale Securities, Fair Value	166,157,000	178,232,000
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-maturity Securities, Debt Maturities, Debt Maturities, without Single Maturity Date, Amortized Cost	308,453,000
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	311,780,000
Held-to-maturity Securities, Amortized Cost	308,453,000	309,933,000
Held-to-Maturity Securities, Fair Value	$311,780,000	$306,383,000

Investment_Securities_Gains_an

Investment Securities (Gains and Losses on Sales) (Details 3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Gross Gains on Sales of Investment Securities	$10,231	$2,160
Gross Losses on Sales of Investment Securities	0	0
Net Gains on Sales of Investment Securities	$10,231	$2,160

Investment_Securities_Fair_Val

Investment Securities (Fair Value, Gross Unrealized Losses, and Narrative) (Details 4) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	security
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	$166,530	$260,475
Less Than 12 Months, Gross Unrealized Losses	-1,435	-1,677
12 Months or Longer, Fair Value	351,021	470,871
12 Months or Longer, Gross Unrealized Losses	-9,005	-13,608
Total Fair Value	517,551	731,346
Total Gross Unrealized Losses	-10,440	-15,285
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	351,491	567,527
Less Than 12 Months, Gross Unrealized Losses	-1,510	-1,884
12 Months or Longer, Fair Value	713,988	1,243,333
12 Months or Longer, Gross Unrealized Losses	-10,315	-27,159
Total Fair Value	1,065,479	1,810,860
Total Gross Unrealized Losses	-11,825	-29,043
Number of investment securities that were in an unrealized loss position	119
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	30,513	1,729
Less Than 12 Months, Gross Unrealized Losses	-106	-2
12 Months or Longer, Fair Value	5,335	5,546
12 Months or Longer, Gross Unrealized Losses	-30	-38
Total Fair Value	35,848	7,275
Total Gross Unrealized Losses	-136	-40
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	19,980	70,016
Less Than 12 Months, Gross Unrealized Losses	-3	-134
12 Months or Longer, Fair Value	30,205	144,222
12 Months or Longer, Gross Unrealized Losses	-66	-1,025
Total Fair Value	50,185	214,238
Total Gross Unrealized Losses	-69	-1,159
Debt Securities Issued by States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	98,931	78,068
Less Than 12 Months, Gross Unrealized Losses	-580	-305
12 Months or Longer, Fair Value	0	94,543
12 Months or Longer, Gross Unrealized Losses	0	-1,140
Total Fair Value	98,931	172,611
Total Gross Unrealized Losses	-580	-1,445
Debt Securities Issued by Corporations
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	24,260	73,829
Less Than 12 Months, Gross Unrealized Losses	-740	-1,171
12 Months or Longer, Fair Value	167,931	180,335
12 Months or Longer, Gross Unrealized Losses	-2,205	-2,814
Total Fair Value	192,191	254,164
Total Gross Unrealized Losses	-2,945	-3,985
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	46,196
Less Than 12 Months, Gross Unrealized Losses	0	-349
12 Months or Longer, Fair Value	77,905	82,109
12 Months or Longer, Gross Unrealized Losses	-913	-3,093
Total Fair Value	77,905	128,305
Total Gross Unrealized Losses	-913	-3,442
Mortgage-Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	12,826	106,849
Less Than 12 Months, Gross Unrealized Losses	-9	-199
12 Months or Longer, Fair Value	177,755	190,447
12 Months or Longer, Gross Unrealized Losses	-6,770	-9,616
Total Fair Value	190,581	297,296
Total Gross Unrealized Losses	-6,779	-9,815
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	331,511	451,315
Less Than 12 Months, Gross Unrealized Losses	-1,507	-1,401
12 Months or Longer, Fair Value	605,878	1,017,002
12 Months or Longer, Gross Unrealized Losses	-9,336	-23,041
Total Fair Value	937,389	1,468,317
Total Gross Unrealized Losses	-10,843	-24,442
Residential - Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	12,826	3,025
Less Than 12 Months, Gross Unrealized Losses	-9	-8
12 Months or Longer, Fair Value	11,598	12,215
12 Months or Longer, Gross Unrealized Losses	-887	-1,035
Total Fair Value	24,424	15,240
Total Gross Unrealized Losses	-896	-1,043
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	331,511	280,967
Less Than 12 Months, Gross Unrealized Losses	-1,507	-1,207
12 Months or Longer, Fair Value	502,727	845,911
12 Months or Longer, Gross Unrealized Losses	-8,611	-19,429
Total Fair Value	834,238	1,126,878
Total Gross Unrealized Losses	-10,118	-20,636
Residential - U.S. Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value		103,824
Less Than 12 Months, Gross Unrealized Losses		-191
12 Months or Longer, Fair Value		0
12 Months or Longer, Gross Unrealized Losses		0
Total Fair Value		103,824
Total Gross Unrealized Losses		-191
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value		45,754
Less Than 12 Months, Gross Unrealized Losses		-15
12 Months or Longer, Fair Value		0
12 Months or Longer, Gross Unrealized Losses		0
Total Fair Value		45,754
Total Gross Unrealized Losses		-15
Commercial - Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Gross Unrealized Losses	0	0
12 Months or Longer, Fair Value	166,157	178,232
12 Months or Longer, Gross Unrealized Losses	-5,883	-8,581
Total Fair Value	166,157	178,232
Total Gross Unrealized Losses	-5,883	-8,581
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	124,594
Less Than 12 Months, Gross Unrealized Losses	0	-179
12 Months or Longer, Fair Value	103,151	171,091
12 Months or Longer, Gross Unrealized Losses	-725	-3,612
Total Fair Value	103,151	295,685
Total Gross Unrealized Losses	($725)	($3,791)

Investment_Securities_Int_Inc_

Investment Securities (Int Inc - Taxable/Non-Taxable Invest Sec) (Details 5) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Taxable And Non-Taxable Interest Income [Abstract]
Interest Income from Investment Securities, Taxable	$29,292	$33,427
Interest Income from Investment Securities, Non-Taxable	5,313	5,222
Total Interest Income from Investment Securities	$34,605	$38,649

Investment_Securities_Municipa

Investment Securities (Municipal bond narrative) (Details 6) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Municipal Debt Securities Issued by One Single State or Political Subdivision as Percentage of Total Fair Value of Entire Municipal Debt Securities Threshold	10.00%
HAWAII | Debt Securities Issued by States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Investments, Fair Value Disclosure	604.3
Municipal Debt Securities [Member] | Geographic Concentration Risk [Member] | HAWAII | Debt Securities Issued by States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Concentration Risk, Percentage	59.00%
Hawaiian Municipal Debt Securities [Member] | Investment Concentration Risk [Member] | HAWAII | General Obligation Bond
Schedule of Available-for-sale Securities [Line Items]
Concentration Risk, Percentage	77.00%
Moody's, Aa2 or Better Rating [Member] | Hawaiian Municipal Debt Securities [Member] | Investment Concentration Risk [Member] | HAWAII | Debt Securities Issued by States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Concentration Risk, Percentage	91.00%

Investment_Securities_FHLB_and

Investment Securities (FHLB and FRB) (Details 7) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank Stock	$44,463	$47,075
Federal Reserve Bank Stock	19,419	19,299
Total	$63,882	$66,374

Investment_Securities_Visa_Cla

Investment Securities (Visa Class B restricted Shares) (Details 8) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net Investment Income [Line Items]
Gain on sale of investment securities	$10,231	$2,160
Visa Class B Restricted Securities
Net Investment Income [Line Items]
Conversion ratio to Class A shares	1.6483
Gain on sale of investment securities	$10,100
Sale of investment securities, shares	95,000
Equity securities remaining, shares	297,814
Donation of Investment Securities, Shares	4,700
Visa Class A Unrestricted Securities
Net Investment Income [Line Items]
Equity securities remaining, shares	490,887

Loans_and_Leases_Portfolio_Det

Loans and Leases Portfolio (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Loan and lease portfolio
Loans and Leases	$7,178,628,000	$6,209,857,000	$6,897,589,000
Net gains related to sales of mortgage loans	500,000	700,000
Commercial
Loan and lease portfolio
Loans and Leases	2,955,110,000	2,572,163,000	2,828,128,000
Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,141,408,000		1,055,243,000
Commercial Mortgage
Loan and lease portfolio
Loans and Leases	1,477,902,000		1,437,513,000
Construction
Loan and lease portfolio
Loans and Leases	111,381,000		109,183,000
Lease Financing
Loan and lease portfolio
Loans and Leases	224,419,000		226,189,000
Consumer
Loan and lease portfolio
Loans and Leases	4,223,518,000	3,637,694,000	4,069,461,000
Residential Mortgage
Loan and lease portfolio
Loans and Leases	2,699,434,000		2,571,090,000
Home Equity
Loan and lease portfolio
Loans and Leases	884,742,000		866,688,000
Automobile
Loan and lease portfolio
Loans and Leases	339,686,000		323,848,000
Other
Loan and lease portfolio
Loans and Leases	$299,656,000		$307,835,000

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Allowance for Loan and Lease Losses:
Balance at the beginning of the period	$108,688	$115,454
Loans and Leases Charged-Off	-4,088	-4,038
Recoveries on Loans and Leases Previously Charged-Off	2,861	2,710
Net Loans and Leases Recovered (Charged-Off)	-1,227	-1,328
Provision for Loan and Lease Losses	0	0
Balance at end of the period	107,461	114,126
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment	5,746	12,602
Collectively Evaluated for Impairment	101,715	101,524
Total	107,461	114,126
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment	65,537	67,595
Collectively Evaluated for Impairment	7,113,091	6,142,262
Total Loans and Leases	7,178,628	6,209,857	6,897,589
Commercial
Allowance for Loan and Lease Losses:
Balance at the beginning of the period	64,551	71,446
Loans and Leases Charged-Off	-235	-819
Recoveries on Loans and Leases Previously Charged-Off	736	941
Net Loans and Leases Recovered (Charged-Off)	501	122
Provision for Loan and Lease Losses	782	-178
Balance at end of the period	65,834	71,390
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment	2,212	8,903
Collectively Evaluated for Impairment	63,622	62,487
Total	65,834	71,390
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment	26,084	29,815
Collectively Evaluated for Impairment	2,929,026	2,542,348
Total Loans and Leases	2,955,110	2,572,163	2,828,128
Consumer
Allowance for Loan and Lease Losses:
Balance at the beginning of the period	44,137	44,008
Loans and Leases Charged-Off	-3,853	-3,219
Recoveries on Loans and Leases Previously Charged-Off	2,125	1,769
Net Loans and Leases Recovered (Charged-Off)	-1,728	-1,450
Provision for Loan and Lease Losses	-782	178
Balance at end of the period	41,627	42,736
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment	3,534	3,699
Collectively Evaluated for Impairment	38,093	39,037
Total	41,627	42,736
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment	39,453	37,780
Collectively Evaluated for Impairment	4,184,065	3,599,914
Total Loans and Leases	$4,223,518	$3,637,694	$4,069,461

Loans_and_Leases_Credit_Qualit

Loans and Leases (Credit Quality Indicators & Narrative) (Details 3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	7,178,628	$6,897,589	$6,209,857
Commercial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	2,955,110	2,828,128	2,572,163
Commercial and Industrial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,141,408	1,055,243
Commercial Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,477,902	1,437,513
Construction
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	111,381	109,183
Lease Financing
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	224,419	226,189
Consumer
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	4,223,518	4,069,461	3,637,694
Residential Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	2,699,434	2,571,090
Home Equity
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	884,742	866,688
Automobile
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	339,686	323,848
Other
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	299,656	307,835
Pass | Commercial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	2,830,400	2,693,450
Pass | Commercial and Industrial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,096,131	1,001,474
Pass | Commercial Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,400,719	1,358,812
Pass | Construction
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	109,608	107,381
Pass | Lease Financing
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	223,942	225,783
Pass | Consumer
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	4,202,610	4,048,753
Pass | Residential Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	2,684,218	2,556,140
Pass | Home Equity
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	880,349	862,258
Pass | Automobile
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	339,149	323,232
Pass | Other
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	298,894	307,123
Special Mention | Commercial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	48,914	62,463
Special Mention | Commercial and Industrial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	14,982	17,364
Special Mention | Commercial Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	33,841	45,082
Special Mention | Construction
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	0	0
Special Mention | Lease Financing
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	91	17
Classified
Recorded investment in loans and leases by class and by credit quality indicator
Number of months up to which residential and home equity loans may be considered classified, even if they are current as to principal and interest	6 months
Classified | Commercial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	75,796	72,215
Classified | Commercial and Industrial
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	30,295	36,405
Classified | Commercial Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	43,342	33,619
Classified | Construction
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	1,773	1,802
Classified | Lease Financing
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	386	389
Classified | Consumer
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator	90 days
Total Recorded Investment in Loans and Leases	20,908	20,708
Classified | Residential Mortgage
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator	90 days
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
Total Recorded Investment in Loans and Leases	15,216	14,950
Classified | Home Equity
Recorded investment in loans and leases by class and by credit quality indicator
Number of days past due for loans and leases in classified credit quality indicator	90 days
Maximum current loan-to-value ratio for residential mortgage and home equity loans to be considered as pass (as a percent)	60.00%
Total Recorded Investment in Loans and Leases	4,393	4,430
Classified | Automobile
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	537	616
Classified | Other
Recorded investment in loans and leases by class and by credit quality indicator
Total Recorded Investment in Loans and Leases	762	$712

Loans_and_Leases_Aging_Analysi

Loans and Leases (Aging Analysis) (Details 4) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	$22,732	$20,096
60 - 89 Days Past Due	5,963	7,656
Past Due 90 Days or More	7,954	8,661
Non- Accrual	26,682	27,771
Total Past Due and Non-Accrual	63,331	64,184
Current	7,115,297	6,833,405
Total Loans and Leases	7,178,628	6,897,589	6,209,857
Non-Accrual Loans and Leases that are Current	10,390	8,826
Number of days non-accrual loans and leases are not past due	30 days
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	3,978	1,450
60 - 89 Days Past Due	214	356
Past Due 90 Days or More	0	2
Non- Accrual	9,373	9,833
Total Past Due and Non-Accrual	13,565	11,641
Current	2,941,545	2,816,487
Total Loans and Leases	2,955,110	2,828,128	2,572,163
Non-Accrual Loans and Leases that are Current	7,910	7,819
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	2,852	992
60 - 89 Days Past Due	180	356
Past Due 90 Days or More	0	2
Non- Accrual	8,641	9,088
Total Past Due and Non-Accrual	11,673	10,438
Current	1,129,735	1,044,805
Total Loans and Leases	1,141,408	1,055,243
Non-Accrual Loans and Leases that are Current	7,402	7,819
Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	1,126	458
60 - 89 Days Past Due	34	0
Past Due 90 Days or More	0	0
Non- Accrual	732	745
Total Past Due and Non-Accrual	1,892	1,203
Current	1,476,010	1,436,310
Total Loans and Leases	1,477,902	1,437,513
Non-Accrual Loans and Leases that are Current	508	0
Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Past Due 90 Days or More	0	0
Non- Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	111,381	109,183
Total Loans and Leases	111,381	109,183
Non-Accrual Loans and Leases that are Current	0	0
Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Past Due 90 Days or More	0	0
Non- Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	224,419	226,189
Total Loans and Leases	224,419	226,189
Non-Accrual Loans and Leases that are Current	0	0
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	18,754	18,646
60 - 89 Days Past Due	5,749	7,300
Past Due 90 Days or More	7,954	8,659
Non- Accrual	17,309	17,938
Total Past Due and Non-Accrual	49,766	52,543
Current	4,173,752	4,016,918
Total Loans and Leases	4,223,518	4,069,461	3,637,694
Non-Accrual Loans and Leases that are Current	2,480	1,007
Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	6,702	4,907
60 - 89 Days Past Due	2,208	2,107
Past Due 90 Days or More	3,914	4,506
Non- Accrual	14,344	14,841
Total Past Due and Non-Accrual	27,168	26,361
Current	2,672,266	2,544,729
Total Loans and Leases	2,699,434	2,571,090
Non-Accrual Loans and Leases that are Current	1,515	632
Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	3,804	3,461
60 - 89 Days Past Due	1,378	2,661
Past Due 90 Days or More	2,425	2,596
Non- Accrual	2,965	3,097
Total Past Due and Non-Accrual	10,572	11,815
Current	874,170	854,873
Total Loans and Leases	884,742	866,688
Non-Accrual Loans and Leases that are Current	965	375
Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	6,126	7,862
60 - 89 Days Past Due	963	1,483
Past Due 90 Days or More	537	616
Non- Accrual	0	0
Total Past Due and Non-Accrual	7,626	9,961
Current	332,060	313,887
Total Loans and Leases	339,686	323,848
Non-Accrual Loans and Leases that are Current	0	0
Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
30 - 59 Days Past Due	2,122	2,416
60 - 89 Days Past Due	1,200	1,049
Past Due 90 Days or More	1,078	941
Non- Accrual	0	0
Total Past Due and Non-Accrual	4,400	4,406
Current	295,256	303,429
Total Loans and Leases	299,656	307,835
Non-Accrual Loans and Leases that are Current	$0	$0

Loans_and_Leases_Impaired_Loan

Loans and Leases (Impaired Loans) (Details 5) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$19,873		$17,932
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	25,177		23,182
Impaired Financing Receivable, with Related Allowance, Recorded Investment	45,664		46,815
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	58,325		59,073
Related Allowance for Loan Losses	5,746		5,948
Recorded Investment	65,537		64,747
Unpaid Principal Balance	83,502		82,255
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18,904	24,973
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	190	163
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	46,241	47,384
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	427	384
Average Recorded Investment	65,145	72,357
Interest Income Recognized	617	547
Commercial
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	19,873		17,932
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	25,177		23,182
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,211		7,184
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,811		13,784
Related Allowance for Loan Losses	2,212		2,387
Recorded Investment	26,084		25,116
Unpaid Principal Balance	37,988		36,966
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18,904	24,967
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	190	163
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,698	9,176
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	26	28
Average Recorded Investment	25,602	34,143
Interest Income Recognized	216	191
Commercial and Industrial
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,798		9,763
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	17,102		15,013
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,211		7,184
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,811		13,784
Related Allowance for Loan Losses	2,212		2,387
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,781	12,875
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	98	92
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,698	9,176
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	26	28
Commercial Mortgage
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	6,407		6,480
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,407		6,480
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,444	11,036
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	65	55
Construction
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,668		1,689
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,668		1,689
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,679	1,056
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	27	16
Consumer
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	39,453		39,631
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	45,514		45,289
Related Allowance for Loan Losses	3,534		3,561
Recorded Investment	39,453		39,631
Unpaid Principal Balance	45,514		45,289
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	39,543	38,208
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	401	356
Average Recorded Investment	39,543	38,214
Interest Income Recognized	401	356
Residential Mortgage
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	31,725		32,331
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	37,786		37,989
Related Allowance for Loan Losses	3,408		3,445
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	32,028	31,841
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	267	236
Home Equity
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,203		1,012
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,203		1,012
Related Allowance for Loan Losses	18		16
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,108	876
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	8	5
Automobile
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,546		5,375
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,546		5,375
Related Allowance for Loan Losses	76		66
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,461	5,124
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	104	107
Other
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	979		913
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	979		913
Related Allowance for Loan Losses	32		34
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	946	367
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$22	$8

Loans_and_Leases_Troubled_Debt

Loans and Leases ( Troubled Debt Restructuring & Narrative) (Details 6) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	contract	contract
Loans and Leases and the Allowance for Loan and Lease Losses
Loans modified in a TDR	$61,800,000		$60,200,000
Available commitments under Revolving Credit Lines, Modified as TDR			0
Loans Modified as a TDR
Number of Contracts	82	69
Recorded Investment (as of period end)	6,450,000	7,776,000
Increase in Allowance (as of period end)	81,000	156,000
Land Loan | Maximum
Loans and Leases and the Allowance for Loan and Lease Losses
Period of Time Loan Being Fully Amortized	360 months
Extending Balloon Payments	5 years
Commercial
Loans Modified as a TDR
Number of Contracts	18	19
Recorded Investment (as of period end)	3,194,000	6,248,000
Increase in Allowance (as of period end)	1,000	120,000
Commercial and Industrial
Loans Modified as a TDR
Number of Contracts	17	18
Recorded Investment (as of period end)	2,687,000	5,883,000
Increase in Allowance (as of period end)	1,000	120,000
Commercial Mortgage
Loans Modified as a TDR
Number of Contracts	1	1
Recorded Investment (as of period end)	507,000	365,000
Increase in Allowance (as of period end)	0	0
Consumer
Loans Modified as a TDR
Number of Contracts	64	50
Recorded Investment (as of period end)	3,256,000	1,528,000
Increase in Allowance (as of period end)	80,000	36,000
Residential Mortgage
Loans Modified as a TDR
Number of Contracts	5	2
Recorded Investment (as of period end)	2,122,000	733,000
Increase in Allowance (as of period end)	61,000	23,000
Residential Mortgage | Maximum
Loans and Leases and the Allowance for Loan and Lease Losses
Period of Time Loan Being Fully Amortized	40 years
Home Equity
Loans Modified as a TDR
Number of Contracts	2	1
Recorded Investment (as of period end)	203,000	74,000
Increase in Allowance (as of period end)	3,000	1,000
Automobile
Loans Modified as a TDR
Number of Contracts	35	37
Recorded Investment (as of period end)	780,000	626,000
Increase in Allowance (as of period end)	11,000	9,000
Other
Loans Modified as a TDR
Number of Contracts	22	10
Recorded Investment (as of period end)	151,000	95,000
Increase in Allowance (as of period end)	$5,000	$3,000

Recovered_Sheet1

Loans and Leases (Troubled debt restructuring's that defaulted during the period) (Details 7) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	contract	contract
Information related to loans modified as a TDR
Number of Contracts	16	9
Recorded Investment (as of period end)	$519	$591
Consumer
Information related to loans modified as a TDR
Number of Contracts	16	9
Recorded Investment (as of period end)	519	591
Residential Mortgage
Information related to loans modified as a TDR
Number of Contracts	1	2
Recorded Investment (as of period end)	306	517
Automobile
Information related to loans modified as a TDR
Number of Contracts	7	4
Recorded Investment (as of period end)	152	53
Other
Information related to loans modified as a TDR
Number of Contracts	8	3
Recorded Investment (as of period end)	$61	$21
Minimum
Information related to loans modified as a TDR
Default period past due following modification of loans in TDR (in days)	60 days

Loans_and_Leases_and_the_Allow2

Loans and Leases and the Allowance for Loan and Lease Losses Loans and Leases (Foreclosure Proceedings) (Detail 8) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Loans and Leases and Allowance for Loan and Lease Losses [Abstract]
Consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$9.80

Mortgage_Servicing_Rights_Narr

Mortgage Servicing Rights (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Transfers and Servicing of Financial Assets [Abstract]
Residential mortgage loans serviced for third parties	$2,800,000,000		$2,900,000,000
Servicing income, including late and ancillary fees	$1,900,000	$2,000,000

Mortgage_Servicing_Rights_Fair

Mortgage Servicing Rights (Fair value method rollforward) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Change in carring value of the mortgage servicing rights accounted for under the fair value measurement method
Balance at Beginning of Period			$2,604
Change in Fair Value:
Balance at End of Period	2,277		2,604
Mortgage Servicing Rights
Change in carring value of the mortgage servicing rights accounted for under the fair value measurement method
Balance at Beginning of Period	2,604	3,826
Change in Fair Value:
Due to Change in Valuation Assumptions	-251	-349
Due to Payoffs	-76	-96
Total Changes in Fair Value of Mortgage Servicing Rights	-327	-445
Balance at End of Period	$2,277	$3,381

Mortgage_Servicing_Rights_Amor

Mortgage Servicing Rights (Amortization method rollforward) (Details) (Mortgage Servicing Rights, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Mortgage Servicing Rights
Change in Carrying Value of Mortgage Servicing Rights Accounted for Under the Amortization Method
Balance at Beginning of Period	$22,091	$24,297
Servicing Rights that Resulted From Asset Transfers	134	354
Amortization	-839	-654
Valuation Allowance Provision	-20	0
Balance at End of Period	21,366	23,997
Valuation Allowance for Impairment of Mortgage Servicing Rights Accounted for under the Amortization Method [Roll Forward]
Balance at Beginning of Period	-57	0
Valuation Allowance Provision	-20	0
Balance at End of Period	-77	0
Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method
Beginning of Period	22,837	30,100
End of Period	$21,431	$28,303

Mortgage_Servicing_Rights_Key_

Mortgage Servicing Rights (Key assumptions) (Details) (Mortgage Servicing Rights)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Mortgage Servicing Rights
Key data and assumptions used in estimating the fair value of mortgage servicing rights
Weighted-Average Constant Prepayment Rate (as a percent)	12.96%	11.62%
Weighted-Average Life (in years)	5 years 9 months 28 days	6 years 3 months 12 days
Weighted-Average Note Rate (as a percent)	4.27%	4.28%
Weighted-Average Discount Rate (as a percent)	10.32%	10.61%

Mortgage_Servicing_Rights_Sens

Mortgage Servicing Rights (Sensitivity analysis) (Details) (Mortgage Servicing Rights, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Mortgage Servicing Rights
Constant Prepayment Rate
Decrease in fair value from 25 basis points (“bps”) adverse change	($236)	($265)
Decrease in fair value from 50 bps adverse change	-467	-524
Discount Rate
Decrease in fair value from 25 bps adverse change	-224	-250
Decrease in fair value from 50 bps adverse change	($445)	($495)

Low_Income_Housing_Tax_Credit_2

Low Income Housing Tax Credit Partnerships (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Affordable Housing Tax Credit Investments and Related Unfunded Commitments [Abstract]
Net affordable housing tax credit investments	$66,600,000		$68,500,000
Affordable Housing Tax Credit Investments, Unfunded Commitment [Abstract]
2015	12,426,000
2016	13,865,000
2017	471,000
2018	15,000
2019	75,000
Thereafter	68,000
Total Unfunded Commitments	26,920,000
Affordable Housing Tax Credits and Other Tax Benefits, Recognized [Abstract]
Effective yield method, tax credits and other tax benefits recognized	3,389,000	2,711,000
Effective yield method, amortization expense in provision for income taxes	$1,893,000	$1,402,000

Balance_Sheet_Offsetting_Detai

Balance Sheet Offsetting (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Offsetting Assets and Liabilities [Line items]
Deposits, Government Entities	$12,979,616,000	$12,633,089,000
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	672,329,000	688,601,000
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	672,329,000	688,601,000
Repurchase Agreements, Fair Value of Collateral Pledged	672,329,000	688,601,000
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	0	0
Interest Rate Swap Agreements
Offsetting Assets and Liabilities [Line items]
Net liability positions, aggregate fair value	16,200,000	16,200,000
Institutional Counterparties | Interest Rate Swap Agreements
Assets:
Gross Amounts of Recognized Assets	0	28,000
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	0	28,000
Netting Adjustments per Master Netting Arrangements	0	28,000
Gross Amounts Not Offset in the Statements of Condition - FV of collateral pledged	0	0
Derivative Assets, Net Amount	0	0
Liabilities:
Gross Amounts of Recognized Liabilities	16,185,000	16,268,000
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	16,185,000	16,268,000
Derivative Liability, Netting Adjustments per Master Netting Arrangements	0	28,000
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Liabilities, Net Amount	16,185,000	16,240,000
Private Institutions
Offsetting Assets and Liabilities [Line items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	700,000,000	700,000,000
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	600,000,000	600,000,000
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	600,000,000	600,000,000
Repurchase Agreements, Fair Value of Collateral Pledged	600,000,000	600,000,000
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	0	0
Government Entities
Offsetting Assets and Liabilities [Line items]
Deposits, Government Entities	1,200,000,000	1,300,000,000
Fair Value of Investment Securities Pledged, Government Entities	1,900,000,000	2,100,000,000
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	72,329,000	88,601,000
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	72,329,000	88,601,000
Repurchase Agreements, Fair Value of Collateral Pledged	72,329,000	88,601,000
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	$0	$0

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (AOCI Components Pre Post & Tax Effect) (Details 1) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Loss, Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$8,711	$10,697
Other Comprehensive Income (Loss) Reclassification Adjustment for Amortization of Held To Maturity holding Gains before Tax	30	-333
Net Unrealized Gains (Losses) on Investment Securities	8,741	10,364
Amortization of Net Actuarial Losses	443	339
Amortization of Prior Service Credit	-81	-81
Defined Benefit Plans, Net	362	258
Other Comprehensive Income (Loss)	9,103	10,622
Other Comprehensive Loss, Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	3,435	4,224
The tax effect of other comprehensive income (loss) reclassification for amortization of holding gains/losses on HTM Securities, tax effect.	12	-131
Tax effect on Unrealized gain/loss on Investment Securities	3,447	4,093
Amortization of Net Actuarial Losses	174	134
Amortization of Prior Service Credit	-32	-32
Defined Benefit Plans, Net	142	102
Other Comprehensive Income (Loss)	3,589	4,195
Other Comprehensive Loss, Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	5,276	6,473
Other Comprehensive Income Reclassification Adjustment for Amortization of Gains on Held To Maturity Securities after Tax	18	-202
Net Unrealized Gains (Losses) on Investment Securities, net of tax	5,294	6,271
Amortization of Net Actuarial Losses	269	205
Amortization of Prior Service Credit	-49	-49
Defined Benefit Plans, Net	220	156
Total Other Comprehensive Income	$5,514	$6,427

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) (Change in AOCI Components net of tax) (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	($26,686)	($31,823)
Other Comprehensive Income (Loss) Before Reclassifications	5,276	6,473
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	238	-46
Total Other Comprehensive Income (Loss)	5,514	6,427
Balance at End of Period	-21,172	-25,396
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	-34,115	-22,394
Other Comprehensive Income (Loss) Before Reclassifications	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	220	156
Total Other Comprehensive Income (Loss)	220	156
Balance at End of Period	-33,895	-22,238
Available-for-sale Securities | Unrealized Gains and Losses on Net Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	15,984	-1,300
Other Comprehensive Income (Loss) Before Reclassifications	5,276	6,473
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Total Other Comprehensive Income (Loss)	5,276	6,473
Balance at End of Period	21,260	5,173
Held-to-maturity Securities | Unrealized Gains and Losses on Net Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	-8,555	-8,129
Other Comprehensive Income (Loss) Before Reclassifications	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	18	-202
Total Other Comprehensive Income (Loss)	18	-202
Balance at End of Period	($8,537)	($8,331)

Accumulated_Other_Comprehensiv4

Accumulated Other Comprehensive Income (Loss) (AOCI Reclass to IS) (Details 3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	($49,780)	($46,897)
Income Before Provision for Income Taxes	62,162	54,454
Tax Benefit (Expense)	-19,720	-15,862
Net Income	42,442	38,592
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Income	-238	46
Amortization of Unrealized Gains(Losses) of Investment Securities Transferred from AFS to HTM | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest Income	-30	333
Tax Benefit (Expense)	12	-131
Net Income	-18	202
Amortization of Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Income Before Provision for Income Taxes	-362	-258
Tax Benefit (Expense)	142	102
Net Income	-220	-156
Prior Service Credit | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	81	81
Net Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	($443)	($339)

Earnings_Per_Share_Details

Earnings Per Share (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of Diluted Shares
Denominator for Basic Earnings Per Share (in shares)	43,386,402	44,193,267
Dilutive Effect of Equity Based Awards (in shares)	211,102	227,082
Denominator for Diluted Earnings Per Share (in shares)	43,597,504	44,420,349
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	0	862

Business_Segments_Details

Business Segments (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting [Abstract]
Federal and State Effective Tax Rate Used for Segment Reporting	37.00%
Business segment financial information
Net Interest Income	$96,770	$93,233
Provision for Loan and Lease Losses	0	0
Net Interest Income After Provision for Credit Losses	96,770	93,233
Noninterest Income	52,307	44,768
Noninterest Expense	-86,915	-83,547
Income Before Provision for Income Taxes	62,162	54,454
Provision for Income Taxes	-19,720	-15,862
Net Income	42,442	38,592
Total Assets	15,139,179	14,263,118	14,787,208
Retail Banking
Business segment financial information
Number of branch locations through which products and services are delivered to customers	74
Number of ATM's through which products and services are delivered to customers	456
Net Interest Income	48,015	41,102
Provision for Loan and Lease Losses	1,723	1,456
Net Interest Income After Provision for Credit Losses	46,292	39,646
Noninterest Income	19,073	19,320
Noninterest Expense	-50,033	-49,096
Income Before Provision for Income Taxes	15,332	9,870
Provision for Income Taxes	-5,447	-3,652
Net Income	9,885	6,218
Total Assets	4,239,641	3,679,909
Commercial Banking
Business segment financial information
Net Interest Income	35,927	28,237
Provision for Loan and Lease Losses	-464	-61
Net Interest Income After Provision for Credit Losses	36,391	28,298
Noninterest Income	5,599	6,260
Noninterest Expense	-18,188	-17,418
Income Before Provision for Income Taxes	23,802	17,140
Provision for Income Taxes	-8,402	-5,879
Net Income	15,400	11,261
Total Assets	2,910,258	2,512,523
Investment Services
Business segment financial information
Net Interest Income	2,977	2,582
Provision for Loan and Lease Losses	-8	-68
Net Interest Income After Provision for Credit Losses	2,985	2,650
Noninterest Income	14,717	14,343
Noninterest Expense	-14,444	-14,235
Income Before Provision for Income Taxes	3,258	2,758
Provision for Income Taxes	-1,205	-1,020
Net Income	2,053	1,738
Total Assets	188,399	183,381
Treasury and Other
Business segment financial information
Net Interest Income	9,851	21,312
Provision for Loan and Lease Losses	-1,251	-1,327
Net Interest Income After Provision for Credit Losses	11,102	22,639
Noninterest Income	12,918	4,845
Noninterest Expense	-4,250	-2,798
Income Before Provision for Income Taxes	19,770	24,686
Provision for Income Taxes	-4,666	-5,311
Net Income	15,104	19,375
Total Assets	$7,800,881	$7,887,305

Pension_Plans_and_Postretireme2

Pension Plans and Postretirement Benefit Plan (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Pension Benefits
Net periodic benefit cost for pension plans and the postretirement benefit plan
Service Cost	$0	$0
Interest Cost	1,186,000	1,242,000
Expected Return on Plan Assets	-1,304,000	-1,275,000
Amortization of Prior Service Credit	0	0
Amortization of Net Actuarial Losses (Gains)	443,000	352,000
Net Periodic Benefit Cost	325,000	319,000
Employer Contributions	100,000
Estimated Future Employer Contributions in Current Fiscal Year	500,000
Postretirement Benefits
Net periodic benefit cost for pension plans and the postretirement benefit plan
Service Cost	182,000	157,000
Interest Cost	324,000	348,000
Expected Return on Plan Assets	0	0
Amortization of Prior Service Credit	-81,000	-81,000
Amortization of Net Actuarial Losses (Gains)	0	-13,000
Net Periodic Benefit Cost	425,000	411,000
Employer Contributions	500,000
Estimated Future Employer Contributions in Current Fiscal Year	$1,400,000

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Notional Amounts) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Interest Rate Lock Commitments
Derivative [Line Items]
Notional Amount	$4,967	$2,354
Fair Value	303	152
Forward Commitments
Derivative [Line Items]
Notional Amount	3,777	5,404
Fair Value	-7	-13
Receive Fixed or Pay Variable Swap
Derivative [Line Items]
Notional Amount	175,728	183,283
Fair Value	16,152	16,206
Pay Fixed or Receive Variable Swap
Derivative [Line Items]
Notional Amount	175,728	183,283
Fair Value	-16,185	-16,240
Foreign Exchange Contracts
Derivative [Line Items]
Notional Amount	144	44,240
Fair Value	($110)	($345)

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Assets and liabilities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	$16,473	$16,515
Liability Derivatives	16,320	16,755
Interest Rate Lock Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	303	152
Liability Derivatives	0	0
Forward Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	1	0
Liability Derivatives	8	13
Interest Rate Swap Agreements
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	16,152	16,262
Liability Derivatives	16,185	16,296
Foreign Exchange Contracts
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	17	101
Liability Derivatives	127	446
Conversion Rate Swap Agreement
Derivative Financial Instruments Not Designated as Hedging Instruments
Liability Derivatives			$100

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Net gains or losses) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in income	$1,258	$1,550
Interest Rate Lock Commitments | Mortgage Banking Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in income	587	1,101
Forward Commitments | Mortgage Banking Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in income	22	-354
Interest Rate Swap Agreements | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in income	0	4
Foreign Exchange Contracts | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in income	$649	$799

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Conversion Rate Swap Agreement narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified
Derivative [Line Items]
Liability Derivatives	$16,320	$16,755
Visa Class B Restricted Securities
Derivative [Line Items]
Conversion ratio to Class A shares	1.6483
Conversion Rate Swap Agreement
Derivative [Line Items]
Liability Derivatives			$100

Commitments_Contingencies_and_2

Commitments, Contingencies, and Guarantees (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Credit Commitments
Credit Commitments	$2,503,823	$2,450,719
Unfunded Commitments to Extend Credit
Credit Commitments
Credit Commitments	2,439,684	2,388,432
Standby Letters of Credit
Credit Commitments
Credit Commitments	46,812	48,157
Commercial Letters of Credit
Credit Commitments
Credit Commitments	$17,327	$14,130

Commitments_Contingencies_and_3

Commitments, Contingencies, and Guarantees - Narrative (Details) (Residential Mortgage, USD $)	3 Months Ended
	Mar. 31, 2015
	Loan
Residential Mortgage
Representations and Warranties [Line Items]
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	$2,700,000,000
Number of Mortgage Loans Repurchased	0
Number of Mortgage Loans Repurchased, Pending	1
Pending Repurchase Mortgage Loans, Unpaid Principal Balance	$300,000
Number of Mortgage Loans Repurchased due to Loan Servicing Activities, Pending	0
Current Residential Mortgage Loans Serviced for Third Parties as Percentage of Total	99.00%

Fair_Value_of_Assets_and_Liabi2

Fair Value of Assets and Liabilities (Fair value on recurring basis) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets:
Available-for-Sale	$2,271,186	$2,289,190
Loans Held for Sale	1,951	5,136
Mortgage Servicing Rights	2,277	2,604
Other Assets	19,577	18,794
Derivatives	16,473	16,515
Total Assets Measured at Fair Value on a Recurring Basis	2,311,464	2,332,239
Liabilites:
Derivatives	16,320	16,755
Total Liabilities Measured at Fair Value on a Recurring Basis	16,320	16,755
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	61,106	61,271
Loans Held for Sale	0	0
Mortgage Servicing Rights	0	0
Other Assets	19,577	18,794
Derivatives	0	0
Total Assets Measured at Fair Value on a Recurring Basis	80,683	80,065
Liabilites:
Derivatives	0	0
Total Liabilities Measured at Fair Value on a Recurring Basis	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	2,210,080	2,227,919
Loans Held for Sale	1,951	5,136
Mortgage Servicing Rights	0	0
Other Assets	0	0
Derivatives	18	101
Total Assets Measured at Fair Value on a Recurring Basis	2,212,049	2,233,156
Liabilites:
Derivatives	135	459
Total Liabilities Measured at Fair Value on a Recurring Basis	135	459
Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Loans Held for Sale	0	0
Mortgage Servicing Rights	2,277	2,604
Other Assets	0	0
Derivatives	16,455	16,414
Total Assets Measured at Fair Value on a Recurring Basis	18,732	19,018
Liabilites:
Derivatives	16,185	16,296
Total Liabilities Measured at Fair Value on a Recurring Basis	16,185	16,296
Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale	355,651	331,258
Debt Securities Issued by the U.S. Treasury and Government Agencies | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	61,106	61,271
Debt Securities Issued by the U.S. Treasury and Government Agencies | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	294,545	269,987
Debt Securities Issued by the U.S. Treasury and Government Agencies | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale	752,468	743,970
Debt Securities Issued by States and Political Subdivisions | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	0	0
Debt Securities Issued by States and Political Subdivisions | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	752,468	743,970
Debt Securities Issued by States and Political Subdivisions | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Debt Securities Issued by Corporations
Assets:
Available-for-Sale	285,945	294,833
Debt Securities Issued by Corporations | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	0	0
Debt Securities Issued by Corporations | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	285,945	294,833
Debt Securities Issued by Corporations | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Mortgage-Backed Securities
Assets:
Available-for-Sale	877,122	919,129
Mortgage-Backed Securities | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	0	0
Mortgage-Backed Securities | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	877,122	919,129
Mortgage-Backed Securities | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Residential - Government Agencies
Assets:
Available-for-Sale	427,391	462,436
Residential - Government Agencies | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	0	0
Residential - Government Agencies | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	427,391	462,436
Residential - Government Agencies | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Residential - U.S. Government Sponsored Enterprises
Assets:
Available-for-Sale	283,574	278,461
Residential - U.S. Government Sponsored Enterprises | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	0	0
Residential - U.S. Government Sponsored Enterprises | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	283,574	278,461
Residential - U.S. Government Sponsored Enterprises | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	0	0
Commercial - Government Agencies
Assets:
Available-for-Sale	166,157	178,232
Commercial - Government Agencies | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale	0	0
Commercial - Government Agencies | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale	166,157	178,232
Commercial - Government Agencies | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale	$0	$0

Fair_Value_of_Assets_and_Liabi3

Fair Value of Assets and Liabilities (FV on recurring basis-Level 3 rollforward) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Mortgage Servicing Rights, Beginning Balance	$2,604	$3,826
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income	-327	-445
Fair Value, Mortgage Servicing Rights, Ending Balance	2,277	3,381
Fair Value, Mortgage Service Rights, Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	-251	-349
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Net Derivative Assets and Liabilities, Beginning Balance	118	379
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income	587	1,104
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale	-435	-1,194
Fair Value, Net Derivative Assets and Liabilities, Ending Balance	270	289
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	$270	$289

Fair_Value_of_Assets_and_Liabi4

Fair Value of Assets and Liabilities (FV on recurring or nonrecurring basis-level 3 inputs) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Interest Rate Lock Commitments | Pricing Model
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Weighted Average Closing Ratio (as a percent)	93.42%	93.85%
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$303	$152
Interest Rate Swap Agreements | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Weighted Average Credit Factor (as a percent)	0.21%	0.21%
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	-33	-34
Mortgage Servicing Rights | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Weighted Average Constant Prepayment Rate (as a percent)	12.96%	11.62%
Weighted Average Discount Rate (as a percent)	10.32%	10.61%
Mortgage Servicing Rights, at Fair Value	$23,708	$25,441

Fair_Value_of_Assets_and_Liabi5

Fair Value of Assets and Liabilities (Fair value on a nonrecurring basis) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed Real Estate	$2,095	$2,311
Foreclosed Real Estate, Valuation Allowance	354	89
Significant Other Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed Real Estate	2,095	2,311
Mortgage Servicing Rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage Servicing Rights accounted for under the amortization method, valuation allowance	77	57	0	0
Mortgage Servicing Rights accounted for under the amortization method	21,366	22,091	23,997	24,297
Mortgage Servicing Rights | Significant Other Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage Servicing Rights accounted for under the amortization method	$21,366	$22,091

Fair_Value_of_Assets_and_Liabi6

Fair Value of Assets and Liabilities (FV option) (Details) (Residential mortgage loans held for sale, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Residential mortgage loans held for sale
Fair Value Option
Aggregate Fair Value	$1,951	$5,136
Aggregate Unpaid Principal	1,831	4,740
Aggregate Fair Value Less Aggregate Unpaid Principal	$120	$396

Fair_Value_of_Assets_and_Liabi7

Fair Value of Assets and Liabilities (Financial instruments not recorded at FV on recurring basis) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financial Instruments - Assets
Held-to-Maturity Securities	$4,378,007	$4,504,495
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity Securities	4,306,353	4,466,679
Loans	6,825,344	6,542,719
Financial Instruments - Liabilities
Time Deposits	1,308,932	1,434,001
Securities Sold Under Agreements to Repurchase	672,329	688,601
Long-Term Debt	163,005	163,005
Fair Value
Financial Instruments - Assets
Held-to-Maturity Securities	4,378,007	4,504,495
Loans	7,373,867	7,048,757
Financial Instruments - Liabilities
Time Deposits	1,312,619	1,437,064
Securities Sold Under Agreements to Repurchase	744,649	758,781
Long-Term Debt	164,269	163,911
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments - Assets
Held-to-Maturity Securities	523,372	499,616
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Long-Term Debt	0	0
Fair Value | Significant Other Observable Inputs (Level 2)
Financial Instruments - Assets
Held-to-Maturity Securities	3,854,635	4,004,879
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	1,312,619	1,437,064
Securities Sold Under Agreements to Repurchase	744,649	758,781
Long-Term Debt	164,269	163,911
Fair Value | Significant Other Unobservable Inputs (Level 3)
Financial Instruments - Assets
Held-to-Maturity Securities	0	0
Loans	7,373,867	7,048,757
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Long-Term Debt	$0	$0