Bank of Hawaii (BOH) 10-Q 23 Oct 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 17, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	BANK OF HAWAII CORP
Entity Central Index Key	46,195
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		42,478,643
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Income
Interest and Fees on Loans and Leases	$ 94,621	$ 83,489	$ 273,467	$ 246,707
Income on Investment Securities
Available-for-Sale	11,987	10,313	34,906	31,648
Held-to-Maturity	20,334	19,315	59,958	59,874
Deposits	5	1	12	7
Funds Sold	1,579	695	3,165	2,066
Other	235	166	673	531
Total Interest Income	128,761	113,979	372,181	340,833
Interest Expense
Deposits	6,663	3,232	15,352	9,199
Securities Sold Under Agreements to Repurchase	4,664	5,713	14,928	18,000
Funds Purchased	0	3	42	9
Short-term Borrowings	0	0	64	0
Other Debt	1,117	1,119	3,327	3,139
Total Interest Expense	12,444	10,067	33,713	30,347
Net Interest Income	116,317	103,912	338,468	310,486
Provision for Credit Losses	4,000	2,500	12,650	1,500
Net Interest Income After Provision for Credit Losses	112,317	101,412	325,818	308,986
Noninterest Income
Trust and Asset Management	11,050	11,008	34,325	34,971
Mortgage Banking	3,237	6,362	10,356	13,639
Service Charges on Deposit Accounts	8,188	8,524	24,522	25,117
Fees, Exchange, and Other Service Charges	13,764	14,023	41,061	41,445
Investment Securities Gains (Losses), Net	(566)	(328)	11,047	10,540
Annuity and Insurance	1,429	1,653	5,585	5,560
Bank-Owned Life Insurance	1,861	1,911	4,908	5,010
Other	3,447	4,961	11,758	14,558
Total Noninterest Income	42,410	48,114	143,562	150,840
Noninterest Expense
Salaries and Benefits	51,626	49,725	153,341	150,528
Net Occupancy	7,727	8,510	24,026	22,671
Net Equipment	5,417	4,913	16,624	15,387
Data Processing	3,882	3,620	11,173	11,543
Professional Fees	3,044	2,396	8,415	7,082
FDIC Insurance	2,107	2,104	6,413	6,600
Other	14,795	16,264	45,363	47,178
Total Noninterest Expense	88,598	87,532	265,355	260,989
Income Before Provision for Income Taxes	66,129	61,994	204,025	198,837
Provision for Income Taxes	20,248	18,501	62,306	60,889
Net Income	$ 45,881	$ 43,493	$ 141,719	$ 137,948
Basic Earnings Per Share (in dollars per share)	$ 1.09	$ 1.02	$ 3.35	$ 3.23
Diluted Earnings Per Share (in dollars per share)	1.08	1.02	3.32	3.21
Dividends Declared Per Share (in dollars per share)	$ 0.52	$ 0.48	$ 1.52	$ 1.41
Basic Weighted Average Shares (in shares)	42,251,541	42,543,122	42,336,441	42,730,571
Diluted Weighted Average Shares (in shares)	42,565,364	42,778,346	42,662,163	42,947,059

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 45,881	$ 43,493	$ 141,719	$ 137,948
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) on Investment Securities	444	(5,528)	8,444	8,323
Defined Benefit Plans	146	140	439	422
Total Other Comprehensive Income (Loss)	590	(5,388)	8,883	8,745
Comprehensive Income	$ 46,471	$ 38,105	$ 150,602	$ 146,693

Consolidated Statements of Cond

Consolidated Statements of Condition (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Interest-Bearing Deposits in Other Banks	$ 3,161	$ 3,187
Funds Sold	512,868	707,343
Investment Securities
Available-for-Sale	2,322,668	2,186,041
Held-to-Maturity (Fair Value of $3,960,956 and $3,827,527)	3,960,598	3,832,997
Loans Held for Sale	9,752	62,499
Loans and Leases	9,573,956	8,949,785
Allowance for Loan and Lease Losses	(106,881)	(104,273)
Net Loans and Leases	9,467,075	8,845,512
Total Earning Assets	16,276,122	15,637,579
Cash and Due From Banks	245,487	169,077
Premises and Equipment, Net	125,162	113,505
Accrued Interest Receivable	51,526	46,444
Foreclosed Real Estate	1,393	1,686
Mortgage Servicing Rights	24,436	23,663
Goodwill	31,517	31,517
Bank-Owned Life Insurance	278,425	274,188
Other Assets	234,234	194,708
Total Assets	17,268,302	16,492,367
Deposits
Noninterest-Bearing Demand	4,825,643	4,772,727
Interest-Bearing Demand	2,896,559	2,934,107
Savings	5,363,866	5,395,699
Time	1,962,092	1,217,707
Total Deposits	15,048,160	14,320,240
Funds Purchased	0	9,616
Securities Sold Under Agreements to Repurchase	505,293	523,378
Other Debt	267,887	267,938
Retirement Benefits Payable	38,308	48,451
Accrued Interest Payable	6,717	5,334
Taxes Payable and Deferred Taxes	31,360	21,674
Other Liabilities	142,684	134,199
Total Liabilities	16,040,409	15,330,830
Shareholders’ Equity
Common Stock ($.01 par value; authorized 500,000,000 shares; issued / outstanding: September 30, 2017 - 57,958,200 / 42,513,348 and December 31, 2016 - 57,856,672 / 42,635,978)	576	576
Capital Surplus	558,530	551,628
Accumulated Other Comprehensive Loss	(25,023)	(33,906)
Retained Earnings	1,491,830	1,415,440
Treasury Stock, at Cost (Shares: September 30, 2017 - 15,444,852 and December 31, 2016 - 15,220,694)	(798,020)	(772,201)
Total Shareholders’ Equity	1,227,893	1,161,537
Total Liabilities and Shareholders’ Equity	$ 17,268,302	$ 16,492,367

Consolidated Statements of Con5

Consolidated Statements of Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Held-to-Maturity: Fair Value	$ 3,960,956	$ 3,827,527
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	57,958,200	57,856,672
Common Stock, outstanding shares	42,513,348	42,635,978
Treasury Stock, Shares	15,444,852	15,220,694

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Balance at Beginning of Period at Dec. 31, 2015	$ 1,116,260	$ 575	$ 542,041	$ (23,557)	$ 1,316,260	$ (719,059)
Beginning Balance (in shares) at Dec. 31, 2015		43,282,153
Increase (decrease) in shareholders' equity
Net Income	137,948				137,948
Other Comprehensive Income	8,745			8,745
Share-Based Compensation	5,020		5,020
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	7,914	$ 1	2,003		(314)	6,224
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		224,018
Common Stock Repurchased	(51,365)					(51,365)
Common Stock Repurchased (in shares)		(772,658)
Cash Dividends Declared (per share)	(60,663)				(60,663)
Balance at End of Period at Sep. 30, 2016	1,163,859	$ 576	549,064	(14,812)	1,393,231	(764,200)
Ending Balance (in shares) at Sep. 30, 2016		42,733,513
Balance at Beginning of Period at Jun. 30, 2016				(9,424)
Increase (decrease) in shareholders' equity
Net Income	43,493
Other Comprehensive Income	(5,388)			(5,388)
Balance at End of Period at Sep. 30, 2016	1,163,859	$ 576	549,064	(14,812)	1,393,231	(764,200)
Ending Balance (in shares) at Sep. 30, 2016		42,733,513
Balance at Beginning of Period at Dec. 31, 2016	$ 1,161,537	$ 576	551,628	(33,906)	1,415,440	(772,201)
Beginning Balance (in shares) at Dec. 31, 2016	42,635,978	42,635,978
Increase (decrease) in shareholders' equity
Net Income	$ 141,719				141,719
Other Comprehensive Income	8,883			8,883
Share-Based Compensation	5,332		5,332
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits	11,739	$ 0	1,570		(383)	10,552
Common Stock Issued under Purchase and Equity Compensation Plans and Related Tax Benefits (in shares)		319,377
Common Stock Repurchased	(36,371)					(36,371)
Common Stock Repurchased (in shares)		(442,007)
Cash Dividends Declared (per share)	(64,946)				(64,946)
Balance at End of Period at Sep. 30, 2017	$ 1,227,893	$ 576	558,530	(25,023)	1,491,830	(798,020)
Ending Balance (in shares) at Sep. 30, 2017	42,513,348	42,513,348
Balance at Beginning of Period at Jun. 30, 2017				(25,613)
Increase (decrease) in shareholders' equity
Net Income	$ 45,881
Other Comprehensive Income	590			590
Balance at End of Period at Sep. 30, 2017	$ 1,227,893	$ 576	$ 558,530	$ (25,023)	$ 1,491,830	$ (798,020)
Ending Balance (in shares) at Sep. 30, 2017	42,513,348	42,513,348

Consolidated Statements of Sha7

Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividends Declared Per Share (in dollars per share)	$ 0.52	$ 0.48	$ 1.52	$ 1.41

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net Income	$ 141,719	$ 137,948
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	12,650	1,500
Depreciation and Amortization	9,832	9,734
Amortization of Deferred Loan and Lease Fees	(744)	(1,089)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	29,685	33,234
Share-Based Compensation	5,332	5,020
Benefit Plan Contributions	(11,098)	(929)
Deferred Income Taxes	3,871	6,465
Net Gains on Sales of Loans and Leases	(5,615)	(8,061)
Net Gains on Sales of Investment Securities	(11,047)	(10,540)
Proceeds from Sales of Loans Held for Sale	238,137	152,185
Originations of Loans Held for Sale	(231,464)	(187,117)
Net Tax Benefit from Share-Based Compensation	2,515	0
Excess Tax Benefits from Share-Based Compensation	0	(916)
Net Change in Other Assets and Other Liabilities	(37,405)	(14,297)
Net Cash Provided by Operating Activities	146,368	123,137
Investment Securities Available-for-Sale:
Proceeds from Prepayments and Maturities	278,719	288,928
Proceeds from Sales	11,052	10,766
Purchases	(417,899)	(248,839)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	654,484	545,133
Purchases	(795,272)	(394,547)
Net Change in Loans and Leases	(722,352)	(954,616)
Proceeds from Sales of Loans	137,717	118,089
Premises and Equipment, Net	(21,489)	(8,823)
Net Cash Used in Investing Activities	(875,040)	(643,909)
Financing Activities
Net Change in Deposits	727,920	557,262
Net Change in Short-Term Borrowings	(27,701)	(74,891)
Proceeds from Long-Term Debt	0	75,000
Repayments of Long-Term Debt	0	(50,000)
Excess Tax Benefits from Share-Based Compensation	0	916
Proceeds from Issuance of Common Stock	11,679	6,903
Repurchase of Common Stock	(36,371)	(51,365)
Cash Dividends Paid	(64,946)	(60,663)
Net Cash Provided by Financing Activities	610,581	403,162
Net Change in Cash and Cash Equivalents	(118,091)	(117,610)
Cash and Cash Equivalents at End of Period	761,516	638,111
Cash and Cash Equivalents at Beginning of Period	879,607	755,721
Supplemental Information
Cash Paid for Interest	32,331	28,952
Cash Paid for Income Taxes	49,957	51,257
Non-Cash Investing Activities:
Transfer from Loans to Foreclosed Real Estate	2,559	1,058
Transfers from Loans to Loans Held for Sale	$ 86,625	$ 140,439

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
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 accompanying consolidated financial statements include the accounts of the Parent and its subsidiaries. The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”). The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, reflect all adjustments necessary for a fair presentation of the results for the interim periods. All such adjustments are of a normal recurring nature. Intercompany accounts and transactions have been eliminated in consolidation. Certain prior period information has been reclassified to conform to the current period presentation. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full fiscal year or for any future period. The accompanying consolidated financial statements 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 and 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, 2016 . 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. Variable Interest Entities Variable interests are defined as contractual ownership or other interests in an entity that change with fluctuations in an entity’s net asset value. The primary beneficiary consolidates the variable interest entity (“VIE”). The primary beneficiary is defined as the enterprise that has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could be significant to the VIE. The Company has limited partnership interests in several low-income housing partnerships. These partnerships provide funds for the construction and operation of apartment complexes that provide affordable housing to lower-income households. If these developments successfully attract a specified percentage of residents falling in that lower-income range, state and/or federal income tax credits are made available to the partners. The tax credits are generally recognized over 10 years. In order to continue receiving the tax credits each year over the life of the partnership, the low-income residency targets must be maintained. Prior to January 1, 2015, the Company utilized the effective yield method whereby the Company recognized tax credits generally over 10 years and amortized the initial cost of the investment to provide a constant effective yield over the period that tax credits are allocated to the Company. On January 1, 2015, the Company adopted ASU No. 2014-01, “Accounting for Investments in Qualified Affordable Housing Projects” prospectively for new investments. 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. As permitted by ASU No. 2014-01, the Company elected to continue to utilize the effective yield method for investments made prior to January 1, 2015. Unfunded commitments to fund these low-income housing partnerships were $26.5 million and $16.2 million as of September 30, 2017 and December 31, 2016 , respectively. These unfunded commitments are unconditional and legally binding and are recorded in other liabilities in the consolidated statements of condition. See Note 5 Affordable Housing Projects Tax Credit Partnerships for more information. The Company also has limited partnership interests in solar energy tax credit partnership investments. These partnerships develop, build, own and operate solar renewable energy projects. Over the course of these investments, the Company expects to receive federal and state tax credits, tax-related benefits, and excess cash available for distribution, if any. The Company may be called to sell its interest in the limited partnerships through a call option once all investment tax credits have been recognized. Tax benefits associated with these investments are generally recognized over six years. These entities meet the definition of a VIE; however, the Company is not the primary beneficiary of the entities as the general partner has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership agreements allow the limited partners, through a majority vote, to remove the general partner, this right is not deemed to be substantive as the general partner can only be removed for cause. The investments in these entities are initially recorded at cost, which approximates the maximum exposure to loss as a result of the Company’s involvement with these unconsolidated entities. The balance of the Company’s investments in these entities was $83.3 million and $78.9 million as of September 30, 2017 and December 31, 2016 , respectively, and is included in other assets in the consolidated statements of condition. Correction of an Immaterial Error to the Financial Statements The Company determined during the fourth quarter of 2016 the proceeds from the sale of residential mortgage loans transferred from portfolio to held for sale were incorrectly reported on the consolidated statements of cash flows. The consolidated statement of cash flows for the nine months ended September 30, 2016 was adjusted to decrease the originations of loans held for sale by $136.7 million , decrease the proceeds from sales of loans held for sale by $116.6 million , and decrease the net change in other assets and other liabilities by $0.1 million . The net result was a $20.1 million increase to the net cash provided by operating activities. In addition, the net change in loans and leases was increased by $138.2 million , and a new line item, proceeds from sales of loans, was inserted for $118.1 million , resulting in a $20.1 million increase to net cash used in investing activities. Lastly, listed in the Supplemental Information section as a non-cash investing activity, transfers from loans to loans held for sale was decreased by $3.5 million . These corrections did not impact the consolidated statements of income or the consolidated statements of condition. The Company evaluated the effect of the incorrect presentation of the consolidated statements of cash flows, both qualitatively and quantitatively, and concluded it did not materially misstate the Company’s previously issued financial statements. Accounting Standards Adopted in 2017 In March 2016, the FASB issued ASU No. 2016-09, “Improvements to Employee Share-Based Payment Accounting.” This ASU includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. Some of the key provisions of this new ASU include: (1) companies will no longer record excess tax benefits and certain tax deficiencies in additional paid-in capital (“APIC”). Instead, they will record all excess tax benefits and tax deficiencies as income tax expense or benefit in the income statement, and APIC pools will be eliminated. The guidance also eliminates the requirement that excess tax benefits be realized before companies can recognize them. In addition, the guidance requires companies to present excess tax benefits as an operating activity on the statement of cash flows rather than as a financing activity; (2) increase the amount an employer can withhold to cover income taxes on awards and still qualify for the exception to liability classification for shares used to satisfy the employer’s statutory income tax withholding obligation. The new guidance will also require an employer to classify the cash paid to a tax authority when shares are withheld to satisfy its statutory income tax withholding obligation as a financing activity on its statement of cash flows (current guidance did not specify how these cash flows should be classified); and (3) permit companies to make an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. ASU No. 2016-09 is effective for interim and annual reporting periods beginning after December 15, 2016. The Company adopted ASU No. 2016-09 on January 1, 2017 and elected to recognize forfeitures as they occur. As allowed by the ASU, the Company’s adoption was prospective; therefore, prior periods have not been adjusted. The adoption of ASU No. 2016-09 could result in increased volatility to reported income tax expense related to excess tax benefits and tax deficiencies for employee share-based transactions. However, the actual amounts recognized in income tax expense will be dependent on the amount of employee share-based transactions and the stock price at the time of vesting or exercise. For the first nine months of 2017 , the adoption of ASU No. 2016-09 resulted in a decrease to the provision for income taxes primarily due to the tax benefit from the exercise of stock options and the vesting of restricted stock. In May 2017, the FASB issued ASU No. 2017-09, “Stock Compensation, Scope of Modification Accounting.” This ASU clarifies when changes to the terms of conditions of a share-based payment award must be accounted for as modifications. Companies will apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. The new guidance should reduce diversity in practice and result in fewer changes to the terms of an award being accounted for as modifications, as the guidance will allow companies to make certain non-substantive changes to awards without accounting for them as modifications. It does not change the accounting for modifications. ASU No. 2017-09 is effective for interim and annual reporting periods beginning after December 15, 2017; early adoption is permitted. The Company elected to early adopt ASU No. 2017-09 in 2017. ASU No. 2017-09 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 consisted of 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 was initially effective for public entities for interim and annual reporting periods beginning after December 15, 2016; early adoption was not permitted. However, in August 2015, the FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers - Deferral of the Effective Date” which deferred the effective date by one year (i.e., to interim and annual reporting periods beginning after December 15, 2017). 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. In addition, the FASB has begun to issue targeted updates to clarify specific implementation issues of ASU 2014-09. These updates include ASU No. 2016-08, “Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU No. 2016-10, “Identifying Performance Obligations and Licensing,” ASU No. 2016-12, “Narrow-Scope Improvements and Practical Expedients,” and ASU No. 2016-20 “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers.” Since the guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, the Company does not expect the new guidance to have a material impact on revenue most closely associated with financial instruments, including interest income and expense. The Company is substantially complete with its overall assessment of revenue streams and reviewing of related contracts potentially affected by the ASU, including trust and asset management fees, deposit related fees, interchange fees, merchant income, and annuity and insurance commissions. The Company’s assessment suggests that adoption of this ASU should not materially change the method in which we currently recognize revenue for these revenue streams. The Company is also substantially complete with its evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue (i.e., gross vs. net). In addition, the Company is evaluating the ASU’s expanded disclosure requirements. The Company plans to adopt ASU No. 2014-09 on January 1, 2018 utilizing the modified retrospective approach with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be material. In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” This ASU addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments by making targeted improvements to GAAP as follows: (1) require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer; (2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value; (3) eliminate the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; (4) eliminate the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (5) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (6) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (7) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (8) clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU No. 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Although the Company has not finalized its evaluation of the impact of adopting ASU No. 2016-01, adoption is not expected to have a material impact on the Company’s Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, “Leases.” Under the new guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases): 1) a lease liability, which is the present value of a lessee’s obligation to make lease payments, and 2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting under the new guidance remains largely unchanged as it is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. Leveraged leases have been eliminated, although lessors can continue to account for existing leveraged leases using the current accounting guidance. Other limited changes were made to align lessor accounting with the lessee accounting model and the new revenue recognition standard . All entities will classify leases to determine how to recognize lease-related revenue and expense. Quantitative and qualitative disclosures will be required by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The intention is to require enough information to supplement the amounts recorded in the financial statements so that users can understand more about the nature of an entity’s leasing activities. ASU No. 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. All entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. They have the option to use certain relief; full retrospective application is prohibited. The Company has several lease agreements, such as branch locations, which are currently considered operating leases, and therefore, not recognized on the Company’s consolidated statements of condition. The Company expects the new guidance will require these lease agreements to now be recognized on the consolidated statements of condition as a right-of-use asset and a corresponding lease liability. Therefore, the Company’s preliminary evaluation indicates the provisions of ASU No. 2016-02 are expected to impact the Company’s consolidated statements of condition, along with our regulatory capital ratios. However, the Company continues to evaluate the extent of potential impact the new guidance will have on the Company’s Consolidated Financial Statements. In addition, the Company is considering obtaining new software to aid in the transition to the new leasing guidance. In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments.” This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren’t measured at fair value through net income. In issuing the standard, the FASB is responding to criticism that today’s guidance delays recognition of credit losses. The standard will replace today’s “incurred loss” approach with an “expected loss” model. The new model, referred to as the current expected credit loss (“CECL”) model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. The CECL model does not apply to available-for-sale (“AFS”) debt securities. For AFS debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a result, entities will recognize improvements to estimated credit losses immediately in earnings rather than as interest income over time, as they do today. The ASU also simplifies the accounting model for purchased credit-impaired debt securities and loans. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU No. 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company is continuing its implementation efforts through its Company-wide implementation team. This team has assigned roles and responsibilities, key tasks to complete, and a general timeline to be followed. The implementation team meets periodically to discuss the latest developments and ensure progress is being made. The team also keeps current on evolving interpretations and industry practices related to ASU 2016-13 via webcasts, publications, conferences, and peer bank meetings. Currently the team is in the process of gathering and reviewing historical data and evaluating different loss methodologies. The Company’s preliminary evaluation indicates the provisions of ASU No. 2016-13 are expected to impact the Company’s Consolidated Financial Statements, in particular the level of the reserve for credit losses. However, the Company continues to evaluate the extent of the potential impact. In August 2016, the FASB issued ASU No. 2016-15, “Classification of Certain Cash Receipts and Cash Payments.” Current GAAP is unclear or does not include specific guidance on how to classify certain transactions in the statement of cash flows. This ASU is intended to reduce diversity in practice in how eight particular transactions are classified in the statement of cash flows. ASU No. 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted, provided that all of the amendments are adopted in the same period. Entities will be required to apply the guidance retrospectively. If it is impracticable to apply the guidance retrospectively for an issue, the amendments related to that issue would be applied prospectively. As this guidance only affects the classification within the statement of cash flows, ASU No. 2016-15 is not expected to have a material impact on the Company’s Consolidated Financial Statements. In January 2017, the FASB issued ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. ASU No. 2017-04 is effective for interim and annual reporting periods beginning after December 15, 2019, applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017. The Company expects to early adopt upon the next goodwill impairment test in 2017. ASU No. 2017-04 is not expected to have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” Under the new guidance, employers will present the service cost component of the net periodic benefit cost in the same income statement line item (e.g., Salaries and Benefits) as other employee compensation costs arising from services rendered during the period. In addition, only the service cost component will be eligible for capitalization in assets. Employers will present the other components separately (e.g., Other Noninterest Expense) from the line item that includes the service cost. ASU No. 2017-07 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted: however, the Company has decided not to early adopt. Employers will apply the guidance on the presentation of the components of net periodic benefit cost in the income statement retrospectively. The guidance limiting the capitalization of net periodic benefit cost in assets to the service cost component will be applied prospectively. The Company expects to utilize the ASU’s practical expedient allowing entities to estimate amounts for comparative periods using the information previously disclosed in their pension and other postretirement benefit plan footnote. ASU No. 2017-07 is not expected to have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-08, “Premium Amortization on Purchased Callable Debt Securities.” This ASU shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, entities generally amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be amortized to maturity. ASU No. 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company is currently evaluating the provisions of ASU No. 2017-08 to determine the potential impact the new standard will have on the Company’s Consolidated Financial Statements. In August 2017, the FASB issued ASU No. 2017-12, “Targeted Improvements to Accounting for Hedging Activities.” This ASU’s objectives are to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities; and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. ASU No. 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The Company currently does not designate any derivative financial instruments as formal hedging relationships, and therefore, does not utilize hedge accounting. However, the Company is currently evaluating this ASU to determine whether its provisions will enhance the Company’s ability to employ risk management strategies, while improving the transparency and understanding of those strategies for financial statement users.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 were as follows: (dollars in thousands) Amortized Cost Gross Gross Fair Value September 30, 2017 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 446,205 $ 3,952 $ (953 ) $ 449,204 Debt Securities Issued by States and Political Subdivisions 624,203 17,783 (23 ) 641,963 Debt Securities Issued by Corporations 268,013 138 (2,305 ) 265,846 Mortgage-Backed Securities: Residential - Government Agencies 247,418 3,605 (1,047 ) 249,976 Residential - U.S. Government-Sponsored Enterprises 646,013 1,056 (4,956 ) 642,113 Commercial - Government Agencies 76,260 — (2,694 ) 73,566 Total Mortgage-Backed Securities 969,691 4,661 (8,697 ) 965,655 Total $ 2,308,112 $ 26,534 $ (11,978 ) $ 2,322,668 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 425,086 $ 380 $ (735 ) $ 424,731 Debt Securities Issued by States and Political Subdivisions 239,462 14,283 — 253,745 Debt Securities Issued by Corporations 123,660 478 (1,156 ) 122,982 Mortgage-Backed Securities: Residential - Government Agencies 2,168,568 14,781 (21,313 ) 2,162,036 Residential - U.S. Government-Sponsored Enterprises 795,992 1,637 (6,918 ) 790,711 Commercial - Government Agencies 207,830 1,972 (3,051 ) 206,751 Total Mortgage-Backed Securities 3,172,390 18,390 (31,282 ) 3,159,498 Total $ 3,960,598 $ 33,531 $ (33,173 ) $ 3,960,956 December 31, 2016 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 407,478 $ 2,531 $ (1,294 ) $ 408,715 Debt Securities Issued by States and Political Subdivisions 662,231 11,455 (1,887 ) 671,799 Debt Securities Issued by Corporations 273,044 5 (3,870 ) 269,179 Mortgage-Backed Securities: Residential - Government Agencies 240,412 4,577 (1,145 ) 243,844 Residential - U.S. Government-Sponsored Enterprises 511,234 971 (5,218 ) 506,987 Commercial - Government Agencies 89,544 — (4,027 ) 85,517 Total Mortgage-Backed Securities 841,190 5,548 (10,390 ) 836,348 Total $ 2,183,943 $ 19,539 $ (17,441 ) $ 2,186,041 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 530,149 $ 1,562 $ (771 ) $ 530,940 Debt Securities Issued by States and Political Subdivisions 242,295 9,991 — 252,286 Debt Securities Issued by Corporations 135,620 416 (1,528 ) 134,508 Mortgage-Backed Securities: Residential - Government Agencies 1,940,076 20,567 (23,861 ) 1,936,782 Residential - U.S. Government-Sponsored Enterprises 752,768 798 (10,919 ) 742,647 Commercial - Government Agencies 232,089 940 (2,665 ) 230,364 Total Mortgage-Backed Securities 2,924,933 22,305 (37,445 ) 2,909,793 Total $ 3,832,997 $ 34,274 $ (39,744 ) $ 3,827,527 The table below presents an analysis of the contractual maturities of the Company’s investment securities as of September 30, 2017 . 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 $ 79,756 $ 80,005 Due After One Year Through Five Years 622,846 628,796 Due After Five Years Through Ten Years 164,664 172,362 Due After Ten Years 25,501 27,186 892,767 908,349 Debt Securities Issued by Government Agencies 445,654 448,664 Mortgage-Backed Securities: Residential - Government Agencies 247,418 249,976 Residential - U.S. Government-Sponsored Enterprises 646,013 642,113 Commercial - Government Agencies 76,260 73,566 Total Mortgage-Backed Securities 969,691 965,655 Total $ 2,308,112 $ 2,322,668 Held-to-Maturity: Due in One Year or Less $ 240,105 $ 239,988 Due After One Year Through Five Years 255,274 257,753 Due After Five Years Through Ten Years 254,585 262,701 Due After Ten Years 38,244 41,016 788,208 801,458 Mortgage-Backed Securities: Residential - Government Agencies 2,168,568 2,162,036 Residential - U.S. Government-Sponsored Enterprises 795,992 790,711 Commercial - Government Agencies 207,830 206,751 Total Mortgage-Backed Securities 3,172,390 3,159,498 Total $ 3,960,598 $ 3,960,956 Investment securities with carrying values of $2.7 billion and $2.4 billion as of September 30, 2017 and December 31, 2016 , 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 and nine months ended September 30, 2017 and 2016 . Three Months Ended Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Gross Gains on Sales of Investment Securities $ — $ — $ 12,467 $ 11,180 Gross Losses on Sales of Investment Securities (566 ) (328 ) (1,420 ) (640 ) Net Gains (Losses) on Sales of Investment Securities $ (566 ) $ (328 ) $ 11,047 $ 10,540 The losses during the three and nine months ended September 30, 2017 and 2016 were due to fees paid to the counterparties of our prior Visa Class B share sale transactions. The Company’s investment securities in an unrealized loss position, segregated by continuous length of loss, 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 September 30, 2017 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 77,995 $ (420 ) $ 152,914 $ (533 ) $ 230,909 $ (953 ) Debt Securities Issued by States and Political Subdivisions 11,064 (20 ) 746 (3 ) 11,810 (23 ) Debt Securities Issued by Corporations 22,995 (8 ) 202,713 (2,297 ) 225,708 (2,305 ) Mortgage-Backed Securities: Residential - Government Agencies 17,046 (4 ) 12,048 (1,043 ) 29,094 (1,047 ) Residential - U.S. Government-Sponsored Enterprises 389,869 (3,512 ) 55,238 (1,444 ) 445,107 (4,956 ) Commercial - Government Agencies — — 73,566 (2,694 ) 73,566 (2,694 ) Total Mortgage-Backed Securities 406,915 (3,516 ) 140,852 (5,181 ) 547,767 (8,697 ) Total $ 518,969 $ (3,964 ) $ 497,225 $ (8,014 ) $ 1,016,194 $ (11,978 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 159,956 $ (238 ) $ 49,804 $ (497 ) $ 209,760 $ (735 ) Debt Securities Issued by Corporations 46,726 (716 ) 14,589 (440 ) 61,315 (1,156 ) Mortgage-Backed Securities: Residential - Government Agencies 897,044 (6,532 ) 516,479 (14,781 ) 1,413,523 (21,313 ) Residential - U.S. Government-Sponsored Enterprises 508,545 (4,881 ) 59,202 (2,037 ) 567,747 (6,918 ) Commercial - Government Agencies 32,799 (573 ) 55,820 (2,478 ) 88,619 (3,051 ) Total Mortgage-Backed Securities 1,438,388 (11,986 ) 631,501 (19,296 ) 2,069,889 (31,282 ) Total $ 1,645,070 $ (12,940 ) $ 695,894 $ (20,233 ) $ 2,340,964 $ (33,173 ) December 31, 2016 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 143,715 $ (562 ) $ 89,211 $ (732 ) $ 232,926 $ (1,294 ) Debt Securities Issued by States and Political Subdivisions 211,188 (1,873 ) 6,725 (14 ) 217,913 (1,887 ) Debt Securities Issued by Corporations 67,332 (714 ) 196,838 (3,156 ) 264,170 (3,870 ) Mortgage-Backed Securities: Residential - Government Agencies 38,355 (89 ) 11,185 (1,056 ) 49,540 (1,145 ) Residential - U.S. Government-Sponsored Enterprises 397,385 (5,218 ) — — 397,385 (5,218 ) Commercial - Government Agencies 5,097 (164 ) 80,420 (3,863 ) 85,517 (4,027 ) Total Mortgage-Backed Securities 440,837 (5,471 ) 91,605 (4,919 ) 532,442 (10,390 ) Total $ 863,072 $ (8,620 ) $ 384,379 $ (8,821 ) $ 1,247,451 $ (17,441 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury $ 169,926 $ (771 ) $ — $ — $ 169,926 $ (771 ) Debt Securities Issued by Corporations 69,601 (971 ) 15,933 (557 ) 85,534 (1,528 ) Mortgage-Backed Securities: Residential - Government Agencies 835,227 (15,313 ) 231,377 (8,548 ) 1,066,604 (23,861 ) Residential - U.S. Government-Sponsored Enterprises 693,047 (10,919 ) — — 693,047 (10,919 ) Commercial - Government Agencies 87,586 (2,597 ) 18,653 (68 ) 106,239 (2,665 ) Total Mortgage-Backed Securities 1,615,860 (28,829 ) 250,030 (8,616 ) 1,865,890 (37,445 ) Total $ 1,855,387 $ (30,571 ) $ 265,963 $ (9,173 ) $ 2,121,350 $ (39,744 ) The Company does not believe that the investment securities that were in an unrealized loss position as of September 30, 2017 , which were comprised of 306 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 September 30, 2017 and December 31, 2016 , the gross unrealized losses reported for mortgage-backed securities were mostly 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 and nine months ended September 30, 2017 and 2016 were as follows: Three Months Ended Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Taxable $ 27,441 $ 24,558 $ 79,949 $ 76,112 Non-Taxable 4,880 5,070 14,915 15,410 Total Interest Income from Investment Securities $ 32,321 $ 29,628 $ 94,864 $ 91,522 As of September 30, 2017 , included in the Company’s investment securities portfolio were debt securities issued by political subdivisions within the State of Hawaii of $510.3 million , representing 57% of the total fair value of the Company’s municipal debt securities. Of the entire Hawaii municipal bond portfolio, 95% were credit-rated Aa2 or better by Moody’s while the remaining Hawaii municipal bonds were credit-rated A2 or better by at least one nationally recognized statistical rating organization. Of the Company’s total Hawaii municipal bond holdings, 78% were general obligation issuances. As of September 30, 2017 , 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 September 30, 2017 and December 31, 2016 , the carrying value of the Company’s Federal Home Loan Bank of Des Moines stock and Federal Reserve Bank stock was as follows: (dollars in thousands) September 30, December 31, Federal Home Loan Bank Stock $ 20,000 $ 20,000 Federal Reserve Bank Stock 20,645 20,063 Total $ 40,645 $ 40,063 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. 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, including the Company. Visa funded an escrow account from its initial public offering to settle these litigation claims. Should this escrow account be insufficient 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 September 30, 2017 , the conversion ratio was 1.6483 . During the first quarter of 2017 , the Company recorded a $12.5 million gain on the sale of 90,000 Visa Class B shares. Concurrent with every sale of Visa Class B shares, the Company has 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 the Visa litigation mentioned above, the remaining 90,914 Class B shares ( 149,854 Class A equivalents) that the Company owns as of September 30, 2017 are carried at a zero cost basis.

Loans and Leases and the Allowa

Loans and Leases and the Allowance for Loan and Lease Losses	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 : (dollars in thousands) September 30, December 31, Commercial Commercial and Industrial $ 1,252,238 $ 1,249,791 Commercial Mortgage 2,050,998 1,889,551 Construction 232,487 270,018 Lease Financing 204,240 208,332 Total Commercial 3,739,963 3,617,692 Consumer Residential Mortgage 3,366,634 3,163,073 Home Equity 1,528,353 1,334,163 Automobile 506,102 454,333 Other 1 432,904 380,524 Total Consumer 5,833,993 5,332,093 Total Loans and Leases $ 9,573,956 $ 8,949,785 1 Comprised of other revolving credit, installment, and lease financing. The majority 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 $1.4 million and $3.6 million for the three months ended September 30, 2017 and 2016 , respectively, and $4.6 million and $9.8 million for the nine months ended September 30, 2017 and 2016 , respectively. Allowance for Loan and Lease Losses (the “Allowance”) The following presents by portfolio segment, the activity in the Allowance for the three and nine months ended September 30, 2017 and 2016 . 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 September 30, 2017 and 2016 . (dollars in thousands) Commercial Consumer Total Three Months Ended September 30, 2017 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 66,182 $ 40,171 $ 106,353 Loans and Leases Charged-Off (611 ) (5,607 ) (6,218 ) Recoveries on Loans and Leases Previously Charged-Off 598 2,148 2,746 Net Loans and Leases Recovered (Charged-Off) (13 ) (3,459 ) (3,472 ) Provision for Credit Losses 295 3,705 4,000 Balance at End of Period $ 66,464 $ 40,417 $ 106,881 Nine Months Ended September 30, 2017 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 65,680 $ 38,593 $ 104,273 Loans and Leases Charged-Off (909 ) (16,500 ) (17,409 ) Recoveries on Loans and Leases Previously Charged-Off 1,200 6,167 7,367 Net Loans and Leases Recovered (Charged-Off) 291 (10,333 ) (10,042 ) Provision for Credit Losses 493 12,157 12,650 Balance at End of Period $ 66,464 $ 40,417 $ 106,881 As of September 30, 2017 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 136 $ 3,762 $ 3,898 Collectively Evaluated for Impairment 66,328 36,655 102,983 Total $ 66,464 $ 40,417 $ 106,881 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 21,738 $ 39,385 $ 61,123 Collectively Evaluated for Impairment 3,718,225 5,794,608 9,512,833 Total $ 3,739,963 $ 5,833,993 $ 9,573,956 Three Months Ended September 30, 2016 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 62,029 $ 41,903 $ 103,932 Loans and Leases Charged-Off (209 ) (4,707 ) (4,916 ) Recoveries on Loans and Leases Previously Charged-Off 296 2,221 2,517 Net Loans and Leases Recovered (Charged-Off) 87 (2,486 ) (2,399 ) Provision for Credit Losses 442 2,058 2,500 Balance at End of Period $ 62,558 $ 41,475 $ 104,033 Nine Months Ended September 30, 2016 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 60,714 $ 42,166 $ 102,880 Loans and Leases Charged-Off (670 ) (12,888 ) (13,558 ) Recoveries on Loans and Leases Previously Charged-Off 7,619 5,592 13,211 Net Loans and Leases Recovered (Charged-Off) 6,949 (7,296 ) (347 ) Provision for Credit Losses (5,105 ) 6,605 1,500 Balance at End of Period $ 62,558 $ 41,475 $ 104,033 As of September 30, 2016 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 11 $ 3,436 $ 3,447 Collectively Evaluated for Impairment 62,547 38,039 100,586 Total $ 62,558 $ 41,475 $ 104,033 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 21,793 $ 38,450 $ 60,243 Collectively Evaluated for Impairment 3,467,761 5,166,093 8,633,854 Total $ 3,489,554 $ 5,204,543 $ 8,694,097 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. 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 generally 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 September 30, 2017 and December 31, 2016 . September 30, 2017 (dollars in thousands) Commercial and Industrial Commercial Mortgage Construction Lease Financing Total Commercial Pass $ 1,206,294 $ 1,997,523 $ 231,033 $ 203,806 $ 3,638,656 Special Mention 18,593 30,744 13 — 49,350 Classified 27,351 22,731 1,441 434 51,957 Total $ 1,252,238 $ 2,050,998 $ 232,487 $ 204,240 $ 3,739,963 (dollars in thousands) Residential Mortgage Home Equity Automobile Other 1 Total Consumer Pass $ 3,357,447 $ 1,521,919 $ 505,296 $ 432,211 $ 5,816,873 Special Mention — 1,764 — — 1,764 Classified 9,187 4,670 806 693 15,356 Total $ 3,366,634 $ 1,528,353 $ 506,102 $ 432,904 $ 5,833,993 Total Recorded Investment in Loans and Leases $ 9,573,956 December 31, 2016 (dollars in thousands) Commercial and Industrial Commercial Mortgage Construction Lease Financing Total Commercial Pass $ 1,203,025 $ 1,792,119 $ 264,287 $ 207,386 $ 3,466,817 Special Mention 20,253 66,734 4,218 5 91,210 Classified 26,513 30,698 1,513 941 59,665 Total $ 1,249,791 $ 1,889,551 $ 270,018 $ 208,332 $ 3,617,692 (dollars in thousands) Residential Mortgage Home Equity Automobile Other 1 Total Consumer Pass $ 3,149,294 $ 1,327,676 $ 453,439 $ 379,793 $ 5,310,202 Special Mention — 2,964 — — 2,964 Classified 13,779 3,523 894 731 18,927 Total $ 3,163,073 $ 1,334,163 $ 454,333 $ 380,524 $ 5,332,093 Total Recorded Investment in Loans and Leases $ 8,949,785 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 September 30, 2017 and December 31, 2016 . (dollars in thousands) 30 - 59 Days Past Due 60 - 89 Days Past Due Past Due 90 Days or More Non-Accrual Total Past Due and Non-Accrual Current Total Loans and Leases Non-Accrual Loans and Leases that are Current 2 As of September 30, 2017 Commercial Commercial and Industrial $ 2,063 $ 206 $ 5 $ 901 $ 3,175 $ 1,249,063 $ 1,252,238 $ 162 Commercial Mortgage 1,321 619 — 1,425 3,365 2,047,633 2,050,998 404 Construction — — — — — 232,487 232,487 — Lease Financing — — — — — 204,240 204,240 — Total Commercial 3,384 825 5 2,326 6,540 3,733,423 3,739,963 566 Consumer Residential Mortgage 3,838 1,456 2,933 9,188 17,415 3,349,219 3,366,634 1,517 Home Equity 2,588 1,017 1,392 4,128 9,125 1,519,228 1,528,353 1,300 Automobile 9,743 1,623 806 — 12,172 493,930 506,102 — Other 1 2,772 1,912 1,528 — 6,212 426,692 432,904 — Total Consumer 18,941 6,008 6,659 13,316 44,924 5,789,069 5,833,993 2,817 Total $ 22,325 $ 6,833 $ 6,664 $ 15,642 $ 51,464 $ 9,522,492 $ 9,573,956 $ 3,383 As of December 31, 2016 Commercial Commercial and Industrial $ 10,698 $ 1,016 $ — $ 151 $ 11,865 $ 1,237,926 $ 1,249,791 $ — Commercial Mortgage 128 17 — 997 1,142 1,888,409 1,889,551 416 Construction — — — — — 270,018 270,018 — Lease Financing — — — — — 208,332 208,332 — Total Commercial 10,826 1,033 — 1,148 13,007 3,604,685 3,617,692 416 Consumer Residential Mortgage 6,491 106 3,127 13,780 23,504 3,139,569 3,163,073 1,628 Home Equity 3,063 2,244 1,457 3,147 9,911 1,324,252 1,334,163 1,015 Automobile 11,692 2,162 894 — 14,748 439,585 454,333 — Other 1 3,200 1,532 1,592 — 6,324 374,200 380,524 — Total Consumer 24,446 6,044 7,070 16,927 54,487 5,277,606 5,332,093 2,643 Total $ 35,272 $ 7,077 $ 7,070 $ 18,075 $ 67,494 $ 8,882,291 $ 8,949,785 $ 3,059 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 September 30, 2017 and December 31, 2016 . (dollars in thousands) Recorded Investment Unpaid Principal Balance Related Allowance for Loan Losses September 30, 2017 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,967 $ 16,279 $ — Commercial Mortgage 9,450 12,950 — Construction 1,441 1,440 — Total Commercial 19,858 30,669 — Total Impaired Loans with No Related Allowance Recorded $ 19,858 $ 30,669 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 656 $ 656 $ 14 Commercial Mortgage 1,224 1,224 122 Total Commercial 1,880 1,880 136 Consumer Residential Mortgage 21,401 26,140 3,117 Home Equity 1,810 1,810 267 Automobile 13,612 13,612 304 Other 1 2,562 2,562 74 Total Consumer 39,385 44,124 3,762 Total Impaired Loans with an Allowance Recorded $ 41,265 $ 46,004 $ 3,898 Impaired Loans: Commercial $ 21,738 $ 32,549 $ 136 Consumer 39,385 44,124 3,762 Total Impaired Loans $ 61,123 $ 76,673 $ 3,898 December 31, 2016 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 9,556 $ 16,518 $ — Commercial Mortgage 9,373 12,873 — Construction 1,513 1,513 — Total Commercial 20,442 30,904 — Total Impaired Loans with No Related Allowance Recorded $ 20,442 $ 30,904 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 765 $ 765 $ 24 Commercial Mortgage 365 365 21 Total Commercial 1,130 1,130 45 Consumer Residential Mortgage 25,625 30,615 3,224 Home Equity 1,516 1,516 15 Automobile 9,660 9,660 206 Other 1 2,325 2,325 65 Total Consumer 39,126 44,116 3,510 Total Impaired Loans with an Allowance Recorded $ 40,256 $ 45,246 $ 3,555 Impaired Loans: Commercial $ 21,572 $ 32,034 $ 45 Consumer 39,126 44,116 3,510 Total Impaired Loans $ 60,698 $ 76,150 $ 3,555 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 and nine months ended September 30, 2017 and 2016 . Three Months Ended Three Months Ended (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,592 $ 106 $ 9,762 $ 115 Commercial Mortgage 9,512 61 9,848 90 Construction 1,453 23 1,548 25 Total Commercial 19,557 190 21,158 230 Total Impaired Loans with No Related Allowance Recorded $ 19,557 $ 190 $ 21,158 $ 230 Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 640 $ 11 $ 681 $ 27 Commercial Mortgage 771 31 194 5 Total Commercial 1,411 42 875 32 Consumer Residential Mortgage 21,674 209 27,172 235 Home Equity 1,773 20 1,428 15 Automobile 12,895 217 7,908 129 Other 1 2,615 52 2,064 44 Total Consumer 38,957 498 38,572 423 Total Impaired Loans with an Allowance Recorded $ 40,368 $ 540 $ 39,447 $ 455 Impaired Loans: Commercial $ 20,968 $ 232 $ 22,033 $ 262 Consumer 38,957 498 38,572 423 Total Impaired Loans $ 59,925 $ 730 $ 60,605 $ 685 Nine Months Ended Nine Months Ended (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,989 $ 248 $ 11,061 $ 333 Commercial Mortgage 9,390 223 10,040 252 Construction 1,477 71 1,570 76 Total Commercial 19,856 542 22,671 661 Total Impaired Loans with No Related Allowance Recorded $ 19,856 $ 542 $ 22,671 $ 661 Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 684 $ 31 $ 983 $ 59 Commercial Mortgage 562 39 97 5 Total Commercial 1,246 70 1,080 64 Consumer Residential Mortgage 23,331 635 27,889 736 Home Equity 1,642 57 1,365 50 Automobile 11,592 581 7,553 376 Other 1 2,553 162 1,922 126 Total Consumer 39,118 1,435 38,729 1,288 Total Impaired Loans with an Allowance Recorded $ 40,364 $ 1,505 $ 39,809 $ 1,352 Impaired Loans: Commercial $ 21,102 $ 612 $ 23,751 $ 725 Consumer 39,118 1,435 38,729 1,288 Total Impaired Loans $ 60,220 $ 2,047 $ 62,480 $ 2,013 1 Comprised of other revolving credit and installment financing. For the three and nine months ended September 30, 2017 and 2016 , 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 and nine months ended September 30, 2017 and 2016 , 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 $59.2 million and $60.0 million as of September 30, 2017 and December 31, 2016 , respectively. As of September 30, 2017 , there were no commitments to lend additional funds on loans modified in a TDR. As of December 31, 2016 , there were $0.4 million of commitments to lend additional funds on loans modified in a TDR. 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 are 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 loan modifications usually involve 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 and nine months ended September 30, 2017 and 2016 . Loans Modified as a TDR for the Loans Modified as a TDR for the 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 1 $ 198 $ — 4 $ 97 $ 1 Commercial Mortgage 2 1,307 93 1 208 2 Total Commercial 3 1,505 93 5 305 3 Consumer Residential Mortgage — — — 3 547 258 Home Equity 2 203 1 — — — Automobile 123 2,636 59 79 1,678 38 Other 2 34 383 9 62 510 14 Total Consumer 159 3,222 69 144 2,735 310 Total 162 $ 4,727 $ 162 149 $ 3,040 $ 313 Loans Modified as a TDR for the Loans Modified as a TDR for the 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 12 $ 7,485 $ 12 6 $ 3,084 $ 1 Commercial Mortgage 3 2,007 93 1 208 2 Total Commercial 15 9,492 105 7 3,292 3 Consumer Residential Mortgage — — — 8 3,025 274 Home Equity 3 442 5 1 476 5 Automobile 326 6,657 149 184 3,617 82 Other 2 136 1,131 28 155 1,127 31 Total Consumer 465 8,230 182 348 8,245 392 Total 480 $ 17,722 $ 287 355 $ 11,537 $ 395 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 and nine months ended September 30, 2017 and 2016 , 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 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 Automobile 15 $ 373 1 $ 3 Other 2 13 83 — — Total Consumer 28 456 1 3 Total 28 $ 456 1 $ 3 Nine Months Ended Nine Months Ended 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 Commercial Commercial and Industrial 1 $ 49 — $ — Total Commercial 1 49 — — Consumer Residential Mortgage — — 3 1,044 Home Equity — — 1 158 Automobile 23 551 3 47 Other 2 33 184 18 110 Total Consumer 56 735 25 1,359 Total 57 $ 784 25 $ 1,359 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 $5.5 million as of September 30, 2017 .

Mortgage Servicing Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2017
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 $2.9 billion as of September 30, 2017 and $2.7 billion as of December 31, 2016 . 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 Fair Value of Assets and Liabilities 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 $1.8 million and $1.7 million for the three months ended September 30, 2017 and 2016 , respectively, and $5.3 million and $5.2 million for the nine months ended September 30, 2017 and 2016 , respectively. 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 and nine months ended September 30, 2017 and 2016 , 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 Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Balance at Beginning of Period $ 1,548 $ 1,819 $ 1,655 $ 1,970 Change in Fair Value: Due to Payoffs (39 ) (79 ) (146 ) (230 ) Total Changes in Fair Value of Mortgage Servicing Rights (39 ) (79 ) (146 ) (230 ) Balance at End of Period $ 1,509 $ 1,740 $ 1,509 $ 1,740 For the three and nine months ended September 30, 2017 and 2016 , 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 Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Balance at Beginning of Period $ 22,923 $ 17,812 $ 22,008 $ 21,032 Servicing Rights that Resulted From Asset Transfers 900 1,670 3,176 2,441 Amortization (739 ) (780 ) (2,047 ) (2,093 ) Valuation Allowance Provision (157 ) 549 (210 ) (2,129 ) Balance at End of Period $ 22,927 $ 19,251 $ 22,927 $ 19,251 Valuation Allowance: Balance at Beginning of Period $ (53 ) $ (2,699 ) $ — $ (21 ) Valuation Allowance Provision (157 ) 549 (210 ) (2,129 ) Balance at End of Period $ (210 ) $ (2,150 ) $ (210 ) $ (2,150 ) Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method Beginning of Period $ 25,479 $ 17,812 $ 25,148 $ 24,804 End of Period $ 23,761 $ 19,177 $ 23,761 $ 19,177 The key data and assumptions used in estimating the fair value of the Company’s mortgage servicing rights as of September 30, 2017 and December 31, 2016 were as follows: September 30, December 31, 2016 Weighted-Average Constant Prepayment Rate 1 9.21 % 8.13 % Weighted-Average Life (in years) 6.88 7.43 Weighted-Average Note Rate 4.06 % 4.10 % Weighted-Average Discount Rate 2 8.89 % 9.33 % 1 Represents annualized loan repayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield 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 September 30, 2017 and December 31, 2016 is presented in the following table. (dollars in thousands) September 30, December 31, Constant Prepayment Rate Decrease in fair value from 25 basis points (“bps”) adverse change $ (284 ) $ (321 ) Decrease in fair value from 50 bps adverse change (563 ) (636 ) Discount Rate Decrease in fair value from 25 bps adverse change (255 ) (288 ) Decrease in fair value from 50 bps adverse change (504 ) (570 ) 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 P

Low Income Housing Tax Credit Partnerships	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Low Income Housing Tax Credit Partnerships	Affordable Housing Projects Tax Credit Partnerships The Company makes 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 limited partnership. Each limited partnership is managed by an unrelated third party general partner who exercises significant 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 the limited partner(s) relating to the approval of 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 are recognized using the proportional amortization method. The Company’s net affordable housing tax credit investments and related unfunded commitments were $73.5 million and $66.6 million as of September 30, 2017 and December 31, 2016 , respectively, and are included in other assets in the consolidated statements of condition. Unfunded Commitments As of September 30, 2017 , the expected payments for unfunded affordable housing commitments were as follows: (dollars in thousands) Amount 2017 $ 8,760 2018 14,164 2019 2,382 2020 51 2021 37 Thereafter 1,065 Total Unfunded Commitments $ 26,459 The following table presents tax credits and other tax benefits recognized and amortization expense related to affordable housing for the three and nine months ended September 30, 2017 and 2016 . Three Months Ended Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Effective Yield Method Tax credits and other tax benefits recognized $ 3,414 $ 3,352 $ 10,282 $ 10,384 Amortization Expense in Provision for Income Taxes 2,105 1,319 6,403 5,667 Proportional Amortization Method Tax credits and other tax benefits recognized $ 440 $ 259 $ 1,201 $ 777 Amortization Expense in Provision for Income Taxes 358 200 969 600 There were no impairment losses related to LIHTC investments during the nine months ended September 30, 2017 and 2016 .

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2017
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 cash or marketable securities, is posted by the party (i.e., the Company or the financial institution counterparty) with net liability positions in accordance with contract thresholds. The Company had net liability positions with its financial institution counterparties totaling $4.8 million and $5.5 million as of September 30, 2017 and December 31, 2016 , respectively. See Note 11 Derivative Financial Instruments for more information. Parties to a centrally cleared over-the-counter derivative exchange daily payments that reflect the daily change in value of the derivative. Effective 2017, these payments, commonly referred to as variation margin, will be recorded as settlements of the derivatives’ mark-to-market exposure rather than collateral against the exposures. During the second quarter of 2017, the Company executed its first centrally cleared swap agreements. This rule change effectively results in any centrally cleared derivative having a fair value that approximates zero on a daily basis, and therefore, these swap agreements were not included in the offsetting table at the end of this section. See Note 11 Derivative Financial Instruments 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 sales and subsequent repurchases 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 pledged by the Company would be used to settle the fair value of the repurchase agreement should the Company be in default (e.g., fail 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 Company is required by the counterparty to maintain adequate collateral levels. In the event the collateral fair value falls below stipulated levels, the Company will pledge additional securities. The Company closely monitors collateral levels to ensure adequate levels are maintained, while mitigating the potential risk of over-collateralization in the event of counterparty default. The following table presents the remaining contractual maturities of the Company’s repurchase agreements as of September 30, 2017 and December 31, 2016 , disaggregated by the class of collateral pledged. Remaining Contractual Maturity of Repurchase Agreements (dollars in thousands) Up to 91-365 days 1-3 Years After Total September 30, 2017 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 69,717 $ 243,168 $ 312,885 Debt Securities Issued by States and Political Subdivisions 1,198 3,300 — — 4,498 Mortgage-Backed Securities: Residential - Government Agencies 795 — — 98,253 99,048 Residential - U.S. Government-Sponsored Enterprises — — 5,283 83,579 88,862 Total $ 1,993 $ 3,300 $ 75,000 $ 425,000 $ 505,293 December 31, 2016 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 200,000 $ 104,681 $ 304,681 Debt Securities Issued by States and Political Subdivisions 22,050 590 — — 22,640 Mortgage-Backed Securities: Residential - Government Agencies 738 — — 97,281 98,019 Residential - U.S. Government-Sponsored Enterprises — — — 98,038 98,038 Total $ 22,788 $ 590 $ 200,000 $ 300,000 $ 523,378 The following table presents the assets and liabilities subject to an enforceable master netting arrangement, or repurchase agreements, as of September 30, 2017 and December 31, 2016 . 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. As previously mentioned, centrally cleared swap agreements between the Company and institutional counterparties are also excluded from this table. (i) (ii) (iii) = (i)-(ii) (iv) (v) = (iii)-(iv) Gross Amounts Recognized in the Statements of Condition Gross Amounts Offset in the Statements of Condition Net Amounts Presented in the Statements of Condition Gross Amounts Not Offset in the Statements of Condition (dollars in thousands) Netting Adjustments per Master Netting Arrangements Fair Value of Collateral Pledged 1 Net Amount September 30, 2017 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 4,168 $ — $ 4,168 $ 4,168 $ — $ — Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 5,998 — 5,998 4,168 1,830 — Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 5,293 — 5,293 — 5,293 — $ 505,293 $ — $ 505,293 $ — $ 505,293 $ — December 31, 2016 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 5,094 $ — $ 5,094 $ 5,094 $ — $ — Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 6,489 — 6,489 5,094 500 895 Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 23,378 — 23,378 — 23,378 — $ 523,378 $ — $ 523,378 $ — $ 523,378 $ — 1 The application of collateral cannot reduce the net amount below zero. Therefore, excess collateral is not reflected in this column. For swap agreements with institutional counterparties, the fair value of investment securities pledged was $6.0 million as of September 30, 2017. For repurchase agreements with private institutions, the fair value of investment securities pledged was $567.3 million and $599.3 million as of September 30, 2017 and December 31, 2016 , respectively. For repurchase agreements with government entities, the fair value of investment securities pledged was $7.0 million and $28.9 million as of September 30, 2017 and December 31, 2016 , respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : (dollars in thousands) Before Tax Tax Effect Net of Tax Three Months Ended September 30, 2017 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ 236 $ 93 $ 143 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 497 196 301 Net Unrealized Gains (Losses) on Investment Securities 733 289 444 Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 322 127 195 Amortization of Prior Service Credit (81 ) (32 ) (49 ) Defined Benefit Plans, Net 241 95 146 Other Comprehensive Income (Loss) $ 974 $ 384 $ 590 Three Months Ended September 30, 2016 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (9,420 ) $ (3,719 ) $ (5,701 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 286 113 173 Net Unrealized Gains (Losses) on Investment Securities (9,134 ) (3,606 ) (5,528 ) Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 314 124 190 Amortization of Prior Service Credit (81 ) (31 ) (50 ) Defined Benefit Plans, Net 233 93 140 Other Comprehensive Income (Loss) $ (8,901 ) $ (3,513 ) $ (5,388 ) Nine Months Ended September 30, 2017 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ 12,458 $ 4,917 $ 7,541 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 1,492 589 903 Net Unrealized Gains (Losses) on Investment Securities 13,950 5,506 8,444 Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 967 382 585 Amortization of Prior Service Credit (242 ) (96 ) (146 ) Defined Benefit Plans, Net 725 286 439 Other Comprehensive Income (Loss) $ 14,675 $ 5,792 $ 8,883 Nine Months Ended September 30, 2016 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ 12,804 $ 5,055 $ 7,749 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 949 375 574 Net Unrealized Gains (Losses) on Investment Securities 13,753 5,430 8,323 Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 940 371 569 Amortization of Prior Service Credit (242 ) (95 ) (147 ) Defined Benefit Plans, Net 698 276 422 Other Comprehensive Income (Loss) $ 14,451 $ 5,706 $ 8,745 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 and nine months ended September 30, 2017 and 2016 : (dollars in thousands) Investment Securities-Available-for-Sale Investment Securities-Held-to-Maturity Defined Benefit Plans Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, 2017 Balance at Beginning of Period $ 8,668 $ (5,682 ) $ (28,599 ) $ (25,613 ) Other Comprehensive Income (Loss) Before Reclassifications 143 — — 143 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 301 146 447 Total Other Comprehensive Income (Loss) 143 301 146 590 Balance at End of Period $ 8,811 $ (5,381 ) $ (28,453 ) $ (25,023 ) Three Months Ended September 30, 2016 Balance at Beginning of Period $ 26,009 $ (6,854 ) $ (28,579 ) $ (9,424 ) Other Comprehensive Income (Loss) Before Reclassifications (5,701 ) — — (5,701 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 173 140 313 Total Other Comprehensive Income (Loss) (5,701 ) 173 140 (5,388 ) Balance at End of Period $ 20,308 $ (6,681 ) $ (28,439 ) $ (14,812 ) Nine Months Ended September 30, 2017 Balance at Beginning of Period $ 1,270 $ (6,284 ) $ (28,892 ) $ (33,906 ) Other Comprehensive Income (Loss) Before Reclassifications 7,541 — — 7,541 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 903 439 1,342 Total Other Comprehensive Income (Loss) 7,541 903 439 8,883 Balance at End of Period $ 8,811 $ (5,381 ) $ (28,453 ) $ (25,023 ) Nine Months Ended September 30, 2016 Balance at Beginning of Period $ 12,559 $ (7,255 ) $ (28,861 ) $ (23,557 ) Other Comprehensive Income (Loss) Before Reclassifications 7,749 — — 7,749 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 574 422 996 Total Other Comprehensive Income (Loss) 7,749 574 422 8,745 Balance at End of Period $ 20,308 $ (6,681 ) $ (28,439 ) $ (14,812 ) The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2017 and 2016 : Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 1 Affected Line Item in the Statement Where Net Income Is Presented Three Months Ended September 30, (dollars in thousands) 2017 2016 Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity $ (497 ) $ (286 ) Interest Income 196 113 Provision for Income Tax (301 ) (173 ) Net of Tax Amortization of Defined Benefit Plan Items Prior Service Credit 2 81 81 Net Actuarial Losses 2 (322 ) (314 ) (241 ) (233 ) Total Before Tax 95 93 Provision for Income Tax (146 ) (140 ) Net of Tax Total Reclassifications for the Period $ (447 ) $ (313 ) Net of Tax Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 1 Affected Line Item in the Statement Where Net Income Is Presented Nine Months Ended September 30, (dollars in thousands) 2017 2016 Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity $ (1,492 ) $ (949 ) Interest Income 589 375 Provision for Income Tax (903 ) (574 ) Net of Tax Amortization of Defined Benefit Plan Items Prior Service Credit 2 242 242 Net Actuarial Losses 2 (967 ) (940 ) (725 ) (698 ) Total Before Tax 286 276 Provision for Income Tax (439 ) (422 ) Net of Tax Total Reclassifications for the Period $ (1,342 ) $ (996 ) 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 Pension Plans and Postretirement Benefit Plan for additional details).

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Three Months Ended Nine Months Ended 2017 2016 2017 2016 Denominator for Basic Earnings Per Share 42,251,541 42,543,122 42,336,441 42,730,571 Dilutive Effect of Equity Based Awards 313,823 235,224 325,722 216,488 Denominator for Diluted Earnings Per Share 42,565,364 42,778,346 42,662,163 42,947,059 Antidilutive Stock Options and Restricted Stock Outstanding 1,070 — 363 —

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Business Segments	Business Segments The Company’s business segments are defined as Retail Banking, Commercial Banking, Investment Services and Private Banking, 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 the process used by 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 income 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 income 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 income 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 some types of consumer insurance products. Products and services from Retail Banking are delivered to customers through 69 branch locations and 388 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. In addition, Commercial Banking offers deposit products to government entities in Hawaii. 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 customers. Investment Services and Private Banking Investment Services and Private Banking includes private banking and international client banking services, 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 groups assist 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 offer 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, 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 and nine months ended September 30, 2017 and 2016 were as follows: (dollars in thousands) Retail Banking Commercial Banking Investment Services and Private Banking Treasury and Other Consolidated Total Three Months Ended September 30, 2017 Net Interest Income $ 67,128 $ 43,438 $ 7,321 $ (1,570 ) $ 116,317 Provision for Credit Losses 3,512 (35 ) (5 ) 528 4,000 Net Interest Income After Provision for Credit Losses 63,616 43,473 7,326 (2,098 ) 112,317 Noninterest Income 21,287 5,137 13,593 2,393 42,410 Noninterest Expense (51,507 ) (17,721 ) (14,925 ) (4,445 ) (88,598 ) Income Before Provision for Income Taxes 33,396 30,889 5,994 (4,150 ) 66,129 Provision for Income Taxes (11,908 ) (10,891 ) (2,218 ) 4,769 (20,248 ) Net Income $ 21,488 $ 19,998 $ 3,776 $ 619 $ 45,881 Total Assets as of September 30, 2017 $ 5,758,799 $ 3,695,606 $ 305,015 $ 7,508,882 $ 17,268,302 Three Months Ended September 30, 2016 Net Interest Income $ 61,747 $ 38,613 $ 6,029 $ (2,477 ) $ 103,912 Provision for Credit Losses 2,574 (168 ) (7 ) 101 2,500 Net Interest Income After Provision for Credit Losses 59,173 38,781 6,036 (2,578 ) 101,412 Noninterest Income 24,786 6,977 13,662 2,689 48,114 Noninterest Expense (51,892 ) (17,449 ) (14,579 ) (3,612 ) (87,532 ) Income Before Provision for Income Taxes 32,067 28,309 5,119 (3,501 ) 61,994 Provision for Income Taxes (11,329 ) (10,073 ) (1,894 ) 4,795 (18,501 ) Net Income $ 20,738 $ 18,236 $ 3,225 $ 1,294 $ 43,493 Total Assets as of September 30, 2016 $ 5,206,442 $ 3,428,424 $ 290,207 $ 7,089,570 $ 16,014,643 Nine Months Ended September 30, 2017 Net Interest Income $ 198,633 $ 127,106 $ 20,685 $ (7,956 ) $ 338,468 Provision for Credit Losses 10,413 (355 ) (16 ) 2,608 12,650 Net Interest Income After Provision for Credit Losses 188,220 127,461 20,701 (10,564 ) 325,818 Noninterest Income 64,132 16,451 43,389 19,590 143,562 Noninterest Expense (155,786 ) (54,483 ) (45,692 ) (9,394 ) (265,355 ) Income Before Provision for Income Taxes 96,566 89,429 18,398 (368 ) 204,025 Provision for Income Taxes (34,323 ) (31,472 ) (6,807 ) 10,296 (62,306 ) Net Income $ 62,243 $ 57,957 $ 11,591 $ 9,928 $ 141,719 Total Assets as of September 30, 2017 $ 5,758,799 $ 3,695,606 $ 305,015 $ 7,508,882 $ 17,268,302 Nine Months Ended September 30, 2016 Net Interest Income $ 179,798 $ 115,112 $ 18,518 $ (2,942 ) $ 310,486 Provision for Credit Losses 7,415 (7,052 ) (18 ) 1,155 1,500 Net Interest Income After Provision for Credit Losses 172,383 122,164 18,536 (4,097 ) 308,986 Noninterest Income 67,364 21,015 43,632 18,829 150,840 Noninterest Expense (155,391 ) (52,479 ) (44,786 ) (8,333 ) (260,989 ) Income Before Provision for Income Taxes 84,356 90,700 17,382 6,399 198,837 Provision for Income Taxes (29,958 ) (32,337 ) (6,431 ) 7,837 (60,889 ) Net Income $ 54,398 $ 58,363 $ 10,951 $ 14,236 $ 137,948 Total Assets as of September 30, 2016 $ 5,206,442 $ 3,428,424 $ 290,207 $ 7,089,570 $ 16,014,643

Pension Plans and Postretiremen

Pension Plans and Postretirement Benefit Plan	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 . Pension Benefits Postretirement Benefits (dollars in thousands) 2017 2016 2017 2016 Three Months Ended September 30, Service Cost $ — $ — $ 123 $ 137 Interest Cost 1,161 1,210 272 294 Expected Return on Plan Assets (1,238 ) (1,282 ) — — Amortization of: Prior Service Credit — — (81 ) (81 ) Net Actuarial Losses (Gains) 433 389 (111 ) (75 ) Net Periodic Benefit Cost $ 356 $ 317 $ 203 $ 275 Nine Months Ended September 30, Service Cost $ — $ — $ 369 $ 411 Interest Cost 3,483 3,628 816 882 Expected Return on Plan Assets (3,714 ) (3,844 ) — — Amortization of: Prior Service Credit — — (242 ) (242 ) Net Actuarial Losses (Gains) 1,298 1,166 (331 ) (226 ) Net Periodic Benefit Cost $ 1,067 $ 950 $ 612 $ 825 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 and nine months ended September 30, 2017 , the Company contributed $10.2 million and $10.4 million , respectively, to the pension plans and $0.2 million and $0.7 million , respectively, to the postretirement benefit plan. The Company expects to contribute a total of $10.5 million to the pension plans and $1.0 million to the postretirement benefit plan for the year ending December 31, 2017 .

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 were as follows: September 30, 2017 December 31, 2016 (dollars in thousands) Notional Amount Fair Value Notional Amount Fair Value Interest Rate Lock Commitments $ 50,050 $ 958 $ 55,223 $ 1,067 Forward Commitments 51,263 19 104,962 847 Interest Rate Swap Agreements Receive Fixed/Pay Variable Swaps 378,618 2,187 357,441 1,381 Pay Fixed/Receive Variable Swaps 378,618 (1,830 ) 357,441 (1,395 ) Foreign Exchange Contracts 56,130 (677 ) 38,172 (757 ) The following table presents the Company’s derivative financial instruments, their fair values, and their location in the consolidated statements of condition as of September 30, 2017 and December 31, 2016 : Derivative Financial Instruments September 30, 2017 December 31, 2016 Not Designated as Hedging Instruments 1 Asset Liability Asset Liability (dollars in thousands) Derivatives Derivatives Derivatives Derivatives Interest Rate Lock Commitments $ 962 $ 4 $ 1,236 $ 169 Forward Commitments 76 57 873 26 Interest Rate Swap Agreements 10,522 10,165 11,569 11,583 Foreign Exchange Contracts 26 703 53 810 Total $ 11,586 $ 10,929 $ 13,731 $ 12,588 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 or losses recognized in the consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 : Location of Derivative Financial Instruments Net Gains (Losses) Three Months Ended Nine Months Ended Not Designated as Hedging Instruments Recognized in the September 30, September 30, (dollars in thousands) Statements of Income 2017 2016 2017 2016 Interest Rate Lock Commitments Mortgage Banking $ 1,550 $ 4,154 $ 4,472 $ 8,113 Forward Commitments Mortgage Banking (434 ) (934 ) (1,322 ) (2,430 ) Interest Rate Swap Agreements Other Noninterest Income 10 1,595 690 2,416 Foreign Exchange Contracts Other Noninterest Income 754 772 2,600 2,245 Total $ 1,880 $ 5,587 $ 6,440 $ 10,344 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 September 30, 2017 and December 31, 2016 , 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 interest rate 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 cash or marketable securities, is posted by the counterparty with net liability positions in accordance with contract thresholds. See Note 6 Balance Sheet Offsetting for more information. The Company’s interest rate swap agreements with financial institution counterparties may contain credit-risk-related contingent features tied to a specified credit rating of the Company. Under these provisions, should the Company’s specified rating fall below a particular level (e.g., investment grade rating), or if the Company no longer obtains the specified rating, the counterparty may require the Company to pledge collateral on an immediate and ongoing basis (subject to the requirement that such swaps are in a net liability position beyond the level specified in the contract), or require immediate settlement of the swap agreement. Other credit-risk-related contingent features may also allow the counterparty to require immediate settlement of the swap agreement if the Company fails to maintain a specified minimum level of capitalization. With regard to derivative contracts not centrally cleared through a clearinghouse, new regulations require collateral to be posted by the party with a net liability position (i.e., the threshold for posting collateral was reduced to zero, subject to certain minimum transfer amounts). The requirements generally apply to new derivative contracts entered into after the applicable compliance date of the regulation (March 1, 2017 for the Company), although certain counterparties may elect to apply lower thresholds to existing contracts. Parties to a centrally cleared over-the-counter derivative exchange daily payments that reflect the daily change in value of the derivative. These payments are commonly referred to as variation margin. Historically, variation margin payments have typically been treated as collateral against the derivative position. Effective 2017, the Chicago Mercantile Exchange and LCH.Clearnet Limited (collectively, the “clearinghouses”) amended their rulebooks to legally characterize variation margin payments for over-the-counter derivatives they clear as settlements of the derivatives’ mark-to-market exposure rather than collateral against the exposures. This rule change effectively results in any derivative cleared through the clearinghouses to have a fair value that approximates zero on a daily basis. During the second quarter of 2017, the Company executed its first swap agreements cleared through the clearinghouses. As of September 30, 2017 , the application of the rule change reduced the swap agreement liability by $0.4 million , as reflected in the table above. Going forward, the Company expects most of the swap agreements executed with third party financial institutions will be required to be cleared through the clearinghouses. The uncleared swap agreements executed with third party financial institutions will remain subject to the collateral requirements and credit-risk-related contingent features described in the previous paragraphs, and therefore, are not subject to the variation margin rule change. Likewise, the swap agreements executed with the Company’s commercial banking customers will remain uncleared and will also not be subject to the variation margin rule change. 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. As each sale of Visa Class B restricted shares was completed, the Company entered 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. As of September 30, 2017 , the conversion rate swap agreement was valued at zero (i.e., no contingent liability recorded) as further reductions to the conversion ratio were deemed neither probable nor reasonably estimable by management. See Note 2 Investment Securities for more information.

Commitments, Contingencies, and

Commitments, Contingencies, and Guarantees	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies, and Guarantees	Commitments, Contingencies, and Guarantees The Company’s credit commitments as of September 30, 2017 and December 31, 2016 were as follows: (dollars in thousands) September 30, December 31, Unfunded Commitments to Extend Credit $ 2,793,531 $ 2,732,734 Standby Letters of Credit 122,137 112,830 Commercial Letters of Credit 18,601 16,269 Total Credit Commitments $ 2,934,269 $ 2,861,833 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 within 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 claims against the Company will not be materially in excess of such amounts reserved by the Company. However, in the event of unexpected future developments, it is possible that the ultimate resolution of these 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 September 30, 2017 , 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 not met. Some agreements may require the Company to repurchase delinquent loans. 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. During the nine months ended September 30, 2017 , there was one residential mortgage loan repurchased with an aggregate unpaid principal balance of $0.2 million as a result of the representation and warranty provisions contained in these contracts. As of September 30, 2017 , there were no pending repurchase requests 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 nine months ended September 30, 2017 , there were no loans repurchased related to loan servicing activities. As of September 30, 2017 , 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 September 30, 2017 , 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 September 30, 2017 , 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 Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2017
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. 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 September 30, 2017 and December 31, 2016 , 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 the significant assumptions and valuation methodologies used by the service. 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 held for sale, 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 a market yield 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 agreements represent 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 date. As of September 30, 2017 and December 31, 2016 , the conversion rate swap agreements were valued at zero as reductions to the conversion ratio were neither probable nor reasonably estimable by management. See Note 11 Derivative Financial Instruments 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 September 30, 2017 and December 31, 2016 : Quoted Prices in Active Markets for Identical Assets or Liabilities Significant Other Observable Inputs Significant Unobservable Inputs (dollars in thousands) (Level 1) (Level 2) (Level 3) Total September 30, 2017 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 541 $ 448,663 $ — $ 449,204 Debt Securities Issued by States and Political Subdivisions — 641,963 — 641,963 Debt Securities Issued by Corporations — 265,846 — 265,846 Mortgage-Backed Securities: Residential - Government Agencies — 249,976 — 249,976 Residential - U.S. Government-Sponsored Enterprises — 642,113 — 642,113 Commercial - Government Agencies — 73,566 — 73,566 Total Mortgage-Backed Securities — 965,655 — 965,655 Total Investment Securities Available-for-Sale 541 2,322,127 — 2,322,668 Loans Held for Sale — 9,752 — 9,752 Mortgage Servicing Rights — — 1,509 1,509 Other Assets 28,064 — — 28,064 Derivatives 1 — 102 11,484 11,586 Total Assets Measured at Fair Value on a $ 28,605 $ 2,331,981 $ 12,993 $ 2,373,579 Liabilities: Derivatives 1 $ — $ 760 $ 10,169 $ 10,929 Total Liabilities Measured at Fair Value on a $ — $ 760 $ 10,169 $ 10,929 December 31, 2016 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 539 $ 408,176 $ — $ 408,715 Debt Securities Issued by States and Political Subdivisions — 671,799 — 671,799 Debt Securities Issued by Corporations — 269,179 — 269,179 Mortgage-Backed Securities: Residential - Government Agencies — 243,844 — 243,844 Residential - U.S. Government-Sponsored Enterprises — 506,987 — 506,987 Commercial - Government Agencies — 85,517 — 85,517 Total Mortgage-Backed Securities — 836,348 — 836,348 Total Investment Securities Available-for-Sale 539 2,185,502 — 2,186,041 Loans Held for Sale — 62,499 — 62,499 Mortgage Servicing Rights — — 1,655 1,655 Other Assets 21,952 — — 21,952 Derivatives 1 — 926 12,805 13,731 Total Assets Measured at Fair Value on a $ 22,491 $ 2,248,927 $ 14,460 $ 2,285,878 Liabilities: Derivatives 1 $ — $ 836 $ 11,752 $ 12,588 Total Liabilities Measured at Fair Value on a $ — $ 836 $ 11,752 $ 12,588 1 The fair value of each class of derivatives is shown in Note 11 Derivative Financial Instruments . For the three and nine months ended September 30, 2017 and 2016 , the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (dollars in thousands) Mortgage Servicing Rights 1 Net Derivative Assets and Liabilities 2 Three Months Ended September 30, 2017 Balance as of July 1, 2017 $ 1,548 $ 1,369 Realized and Unrealized Net Gains (Losses): Included in Net Income (39 ) 1,561 Transfers to Loans Held for Sale — (1,631 ) Variation Margin Payments — 16 Balance as of September 30, 2017 $ 1,509 $ 1,315 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 1,315 Three Months Ended September 30, 2016 Balance as of July 1, 2016 $ 1,819 $ 1,908 Realized and Unrealized Net Gains (Losses): Included in Net Income (79 ) 4,149 Transfers to Loans Held for Sale — (3,696 ) Balance as of September 30, 2016 $ 1,740 $ 2,361 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 2,361 Nine Months Ended September 30, 2017 Balance as of January 1, 2017 $ 1,655 $ 1,053 Realized and Unrealized Net Gains (Losses): Included in Net Income (146 ) 4,469 Transfers to Loans Held for Sale — (4,581 ) Variation Margin Payments — 374 Balance as of September 30, 2017 $ 1,509 $ 1,315 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 1,315 Nine Months Ended September 30, 2016 Balance as of January 1, 2016 $ 1,970 $ 240 Realized and Unrealized Net Gains (Losses): Included in Net Income (230 ) 8,003 Transfers to Loans Held for Sale — (5,882 ) Balance as of September 30, 2016 $ 1,740 $ 2,361 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 2,361 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 September 30, 2017 and December 31, 2016 , the significant unobservable inputs used in the fair value measurements were as follows: Significant Unobservable Inputs (weighted-average) Fair Value (dollars in thousands) Valuation Technique Description Sept. 30, Dec. 31, Sept. 30, Dec. 31, Mortgage Servicing Rights Discounted Cash Flow Constant Prepayment Rate 1 9.21 % 8.13 % $ 25,270 $ 26,803 Discount Rate 2 8.89 % 9.33 % Net Derivative Assets and Liabilities: Interest Rate Lock Commitments Pricing Model Closing Ratio 93.40 % 92.26 % $ 958 $ 1,067 Interest Rate Swap Agreements Discounted Cash Flow Credit Factor 0.16 % 0.13 % $ 357 $ (14 ) 1 Represents annualized loan repayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield 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 comparing the model’s results 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 September 30, 2017 . There were no assets measured at fair value on a nonrecurring basis as of December 31, 2016 . (dollars in thousands) Fair Value Hierarchy Net Carrying Amount Valuation Allowance September 30, 2017 Mortgage Servicing Rights - amortization method Level 3 $ 22,927 $ 210 The write-down of mortgage servicing rights accounted for under the amortization method 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. Fair Value Option The Company elects the fair value option for all residential mortgage loans held for sale. 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 September 30, 2017 and December 31, 2016 . (dollars in thousands) Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Unpaid Principal September 30, 2017 Loans Held for Sale $ 9,752 $ 9,458 $ 294 December 31, 2016 Loans Held for Sale $ 62,499 $ 61,782 $ 717 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 and nine months ended September 30, 2017 and 2016 , 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. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments. Time Deposits The fair value of the Company’s time deposits was calculated using discounted cash flow analyses, applying discount rates based on market yield curve rates for similar 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 based on market yield curve rates for similar maturities. Other Debt The fair value of the Company’s other debt was calculated using a discounted cash flow analyses, applying discount rates based on market yield curve rates for similar maturities. 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 September 30, 2017 and December 31, 2016 . 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 in Active Markets for Identical Assets or Liabilities Significant Other Observable Inputs Significant Unobservable Inputs (dollars in thousands) Amount Fair Value (Level 1) (Level 2) (Level 3) September 30, 2017 Financial Instruments - Assets Investment Securities Held-to-Maturity $ 3,960,598 $ 3,960,956 $ 424,731 $ 3,536,225 $ — Loans 1 9,193,837 9,361,879 — — 9,361,879 Financial Instruments - Liabilities Time Deposits 1,962,092 1,956,957 — 1,956,957 — Securities Sold Under Agreements to Repurchase 505,293 505,278 — 505,278 — Other Debt 2 257,153 256,548 — 256,548 — December 31, 2016 Financial Instruments - Assets Investment Securities Held-to-Maturity $ 3,832,997 $ 3,827,527 $ 530,940 $ 3,296,587 $ — Loans 1 8,583,726 8,743,191 — — 8,743,191 Financial Instruments - Liabilities Time Deposits 1,217,707 1,213,705 — 1,213,705 — Securities Sold Under Agreements to Repurchase 523,378 523,374 — 523,374 — Other Debt 2 257,153 256,718 — 256,718 — 1 Net of unearned income and the Allowance. 2 Excludes capitalized lease obligations.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	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 accompanying consolidated financial statements include the accounts of the Parent and its subsidiaries. The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”). The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, reflect all adjustments necessary for a fair presentation of the results for the interim periods. All such adjustments are of a normal recurring nature. Intercompany accounts and transactions have been eliminated in consolidation. Certain prior period information has been reclassified to conform to the current period presentation. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full fiscal year or for any future period. The accompanying consolidated financial statements 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 and 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, 2016 .
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.
Variable Interest Entities	Variable Interest Entities Variable interests are defined as contractual ownership or other interests in an entity that change with fluctuations in an entity’s net asset value. The primary beneficiary consolidates the variable interest entity (“VIE”). The primary beneficiary is defined as the enterprise that has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could be significant to the VIE. The Company has limited partnership interests in several low-income housing partnerships. These partnerships provide funds for the construction and operation of apartment complexes that provide affordable housing to lower-income households. If these developments successfully attract a specified percentage of residents falling in that lower-income range, state and/or federal income tax credits are made available to the partners. The tax credits are generally recognized over 10 years. In order to continue receiving the tax credits each year over the life of the partnership, the low-income residency targets must be maintained. Prior to January 1, 2015, the Company utilized the effective yield method whereby the Company recognized tax credits generally over 10 years and amortized the initial cost of the investment to provide a constant effective yield over the period that tax credits are allocated to the Company. On January 1, 2015, the Company adopted ASU No. 2014-01, “Accounting for Investments in Qualified Affordable Housing Projects” prospectively for new investments. 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. As permitted by ASU No. 2014-01, the Company elected to continue to utilize the effective yield method for investments made prior to January 1, 2015. Unfunded commitments to fund these low-income housing partnerships were $26.5 million and $16.2 million as of September 30, 2017 and December 31, 2016 , respectively. These unfunded commitments are unconditional and legally binding and are recorded in other liabilities in the consolidated statements of condition. See Note 5 Affordable Housing Projects Tax Credit Partnerships for more information. The Company also has limited partnership interests in solar energy tax credit partnership investments. These partnerships develop, build, own and operate solar renewable energy projects. Over the course of these investments, the Company expects to receive federal and state tax credits, tax-related benefits, and excess cash available for distribution, if any. The Company may be called to sell its interest in the limited partnerships through a call option once all investment tax credits have been recognized. Tax benefits associated with these investments are generally recognized over six years. These entities meet the definition of a VIE; however, the Company is not the primary beneficiary of the entities as the general partner has both the power to direct the activities that most significantly impact the economic performance of the entities and the obligation to absorb losses or the right to receive benefits that could be significant to the entities. While the partnership agreements allow the limited partners, through a majority vote, to remove the general partner, this right is not deemed to be substantive as the general partner can only be removed for cause. The investments in these entities are initially recorded at cost, which approximates the maximum exposure to loss as a result of the Company’s involvement with these unconsolidated entities. The balance of the Company’s investments in these entities was $83.3 million and $78.9 million as of September 30, 2017 and December 31, 2016 , respectively, and is included in other assets in the consolidated statements of condition.
Accounting Standards Adopted in the Current Year or Pending Adoption	Accounting Standards Adopted in 2017 In March 2016, the FASB issued ASU No. 2016-09, “Improvements to Employee Share-Based Payment Accounting.” This ASU includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. Some of the key provisions of this new ASU include: (1) companies will no longer record excess tax benefits and certain tax deficiencies in additional paid-in capital (“APIC”). Instead, they will record all excess tax benefits and tax deficiencies as income tax expense or benefit in the income statement, and APIC pools will be eliminated. The guidance also eliminates the requirement that excess tax benefits be realized before companies can recognize them. In addition, the guidance requires companies to present excess tax benefits as an operating activity on the statement of cash flows rather than as a financing activity; (2) increase the amount an employer can withhold to cover income taxes on awards and still qualify for the exception to liability classification for shares used to satisfy the employer’s statutory income tax withholding obligation. The new guidance will also require an employer to classify the cash paid to a tax authority when shares are withheld to satisfy its statutory income tax withholding obligation as a financing activity on its statement of cash flows (current guidance did not specify how these cash flows should be classified); and (3) permit companies to make an accounting policy election for the impact of forfeitures on the recognition of expense for share-based payment awards. Forfeitures can be estimated, as required today, or recognized when they occur. ASU No. 2016-09 is effective for interim and annual reporting periods beginning after December 15, 2016. The Company adopted ASU No. 2016-09 on January 1, 2017 and elected to recognize forfeitures as they occur. As allowed by the ASU, the Company’s adoption was prospective; therefore, prior periods have not been adjusted. The adoption of ASU No. 2016-09 could result in increased volatility to reported income tax expense related to excess tax benefits and tax deficiencies for employee share-based transactions. However, the actual amounts recognized in income tax expense will be dependent on the amount of employee share-based transactions and the stock price at the time of vesting or exercise. For the first nine months of 2017 , the adoption of ASU No. 2016-09 resulted in a decrease to the provision for income taxes primarily due to the tax benefit from the exercise of stock options and the vesting of restricted stock. In May 2017, the FASB issued ASU No. 2017-09, “Stock Compensation, Scope of Modification Accounting.” This ASU clarifies when changes to the terms of conditions of a share-based payment award must be accounted for as modifications. Companies will apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. The new guidance should reduce diversity in practice and result in fewer changes to the terms of an award being accounted for as modifications, as the guidance will allow companies to make certain non-substantive changes to awards without accounting for them as modifications. It does not change the accounting for modifications. ASU No. 2017-09 is effective for interim and annual reporting periods beginning after December 15, 2017; early adoption is permitted. The Company elected to early adopt ASU No. 2017-09 in 2017. ASU No. 2017-09 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 consisted of 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 was initially effective for public entities for interim and annual reporting periods beginning after December 15, 2016; early adoption was not permitted. However, in August 2015, the FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers - Deferral of the Effective Date” which deferred the effective date by one year (i.e., to interim and annual reporting periods beginning after December 15, 2017). 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. In addition, the FASB has begun to issue targeted updates to clarify specific implementation issues of ASU 2014-09. These updates include ASU No. 2016-08, “Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” ASU No. 2016-10, “Identifying Performance Obligations and Licensing,” ASU No. 2016-12, “Narrow-Scope Improvements and Practical Expedients,” and ASU No. 2016-20 “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers.” Since the guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, the Company does not expect the new guidance to have a material impact on revenue most closely associated with financial instruments, including interest income and expense. The Company is substantially complete with its overall assessment of revenue streams and reviewing of related contracts potentially affected by the ASU, including trust and asset management fees, deposit related fees, interchange fees, merchant income, and annuity and insurance commissions. The Company’s assessment suggests that adoption of this ASU should not materially change the method in which we currently recognize revenue for these revenue streams. The Company is also substantially complete with its evaluation of certain costs related to these revenue streams to determine whether such costs should be presented as expenses or contra-revenue (i.e., gross vs. net). In addition, the Company is evaluating the ASU’s expanded disclosure requirements. The Company plans to adopt ASU No. 2014-09 on January 1, 2018 utilizing the modified retrospective approach with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be material. In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” This ASU addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments by making targeted improvements to GAAP as follows: (1) require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. However, an entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer; (2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value; (3) eliminate the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities; (4) eliminate the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (5) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (6) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; (7) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (8) clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU No. 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Although the Company has not finalized its evaluation of the impact of adopting ASU No. 2016-01, adoption is not expected to have a material impact on the Company’s Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, “Leases.” Under the new guidance, lessees will be required to recognize the following for all leases (with the exception of short-term leases): 1) a lease liability, which is the present value of a lessee’s obligation to make lease payments, and 2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting under the new guidance remains largely unchanged as it is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. Leveraged leases have been eliminated, although lessors can continue to account for existing leveraged leases using the current accounting guidance. Other limited changes were made to align lessor accounting with the lessee accounting model and the new revenue recognition standard . All entities will classify leases to determine how to recognize lease-related revenue and expense. Quantitative and qualitative disclosures will be required by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The intention is to require enough information to supplement the amounts recorded in the financial statements so that users can understand more about the nature of an entity’s leasing activities. ASU No. 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. All entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. They have the option to use certain relief; full retrospective application is prohibited. The Company has several lease agreements, such as branch locations, which are currently considered operating leases, and therefore, not recognized on the Company’s consolidated statements of condition. The Company expects the new guidance will require these lease agreements to now be recognized on the consolidated statements of condition as a right-of-use asset and a corresponding lease liability. Therefore, the Company’s preliminary evaluation indicates the provisions of ASU No. 2016-02 are expected to impact the Company’s consolidated statements of condition, along with our regulatory capital ratios. However, the Company continues to evaluate the extent of potential impact the new guidance will have on the Company’s Consolidated Financial Statements. In addition, the Company is considering obtaining new software to aid in the transition to the new leasing guidance. In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments.” This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren’t measured at fair value through net income. In issuing the standard, the FASB is responding to criticism that today’s guidance delays recognition of credit losses. The standard will replace today’s “incurred loss” approach with an “expected loss” model. The new model, referred to as the current expected credit loss (“CECL”) model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held-to-maturity securities, loan commitments, and financial guarantees. The CECL model does not apply to available-for-sale (“AFS”) debt securities. For AFS debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a result, entities will recognize improvements to estimated credit losses immediately in earnings rather than as interest income over time, as they do today. The ASU also simplifies the accounting model for purchased credit-impaired debt securities and loans. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU No. 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company is continuing its implementation efforts through its Company-wide implementation team. This team has assigned roles and responsibilities, key tasks to complete, and a general timeline to be followed. The implementation team meets periodically to discuss the latest developments and ensure progress is being made. The team also keeps current on evolving interpretations and industry practices related to ASU 2016-13 via webcasts, publications, conferences, and peer bank meetings. Currently the team is in the process of gathering and reviewing historical data and evaluating different loss methodologies. The Company’s preliminary evaluation indicates the provisions of ASU No. 2016-13 are expected to impact the Company’s Consolidated Financial Statements, in particular the level of the reserve for credit losses. However, the Company continues to evaluate the extent of the potential impact. In August 2016, the FASB issued ASU No. 2016-15, “Classification of Certain Cash Receipts and Cash Payments.” Current GAAP is unclear or does not include specific guidance on how to classify certain transactions in the statement of cash flows. This ASU is intended to reduce diversity in practice in how eight particular transactions are classified in the statement of cash flows. ASU No. 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted, provided that all of the amendments are adopted in the same period. Entities will be required to apply the guidance retrospectively. If it is impracticable to apply the guidance retrospectively for an issue, the amendments related to that issue would be applied prospectively. As this guidance only affects the classification within the statement of cash flows, ASU No. 2016-15 is not expected to have a material impact on the Company’s Consolidated Financial Statements. In January 2017, the FASB issued ASU No. 2017-04, “Simplifying the Test for Goodwill Impairment.” The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. ASU No. 2017-04 is effective for interim and annual reporting periods beginning after December 15, 2019, applied prospectively. Early adoption is permitted for any impairment tests performed after January 1, 2017. The Company expects to early adopt upon the next goodwill impairment test in 2017. ASU No. 2017-04 is not expected to have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” Under the new guidance, employers will present the service cost component of the net periodic benefit cost in the same income statement line item (e.g., Salaries and Benefits) as other employee compensation costs arising from services rendered during the period. In addition, only the service cost component will be eligible for capitalization in assets. Employers will present the other components separately (e.g., Other Noninterest Expense) from the line item that includes the service cost. ASU No. 2017-07 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted: however, the Company has decided not to early adopt. Employers will apply the guidance on the presentation of the components of net periodic benefit cost in the income statement retrospectively. The guidance limiting the capitalization of net periodic benefit cost in assets to the service cost component will be applied prospectively. The Company expects to utilize the ASU’s practical expedient allowing entities to estimate amounts for comparative periods using the information previously disclosed in their pension and other postretirement benefit plan footnote. ASU No. 2017-07 is not expected to have a material impact on the Company’s Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-08, “Premium Amortization on Purchased Callable Debt Securities.” This ASU shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, entities generally amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be amortized to maturity. ASU No. 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company is currently evaluating the provisions of ASU No. 2017-08 to determine the potential impact the new standard will have on the Company’s Consolidated Financial Statements. In August 2017, the FASB issued ASU No. 2017-12, “Targeted Improvements to Accounting for Hedging Activities.” This ASU’s objectives are to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities; and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. ASU No. 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The Company currently does not designate any derivative financial instruments as formal hedging relationships, and therefore, does not utilize hedge accounting. However, the Company is currently evaluating this ASU to determine whether its provisions will enhance the Company’s ability to employ risk management strategies, while improving the transparency and understanding of those strategies for financial statement users.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 were as follows: (dollars in thousands) Amortized Cost Gross Gross Fair Value September 30, 2017 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 446,205 $ 3,952 $ (953 ) $ 449,204 Debt Securities Issued by States and Political Subdivisions 624,203 17,783 (23 ) 641,963 Debt Securities Issued by Corporations 268,013 138 (2,305 ) 265,846 Mortgage-Backed Securities: Residential - Government Agencies 247,418 3,605 (1,047 ) 249,976 Residential - U.S. Government-Sponsored Enterprises 646,013 1,056 (4,956 ) 642,113 Commercial - Government Agencies 76,260 — (2,694 ) 73,566 Total Mortgage-Backed Securities 969,691 4,661 (8,697 ) 965,655 Total $ 2,308,112 $ 26,534 $ (11,978 ) $ 2,322,668 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 425,086 $ 380 $ (735 ) $ 424,731 Debt Securities Issued by States and Political Subdivisions 239,462 14,283 — 253,745 Debt Securities Issued by Corporations 123,660 478 (1,156 ) 122,982 Mortgage-Backed Securities: Residential - Government Agencies 2,168,568 14,781 (21,313 ) 2,162,036 Residential - U.S. Government-Sponsored Enterprises 795,992 1,637 (6,918 ) 790,711 Commercial - Government Agencies 207,830 1,972 (3,051 ) 206,751 Total Mortgage-Backed Securities 3,172,390 18,390 (31,282 ) 3,159,498 Total $ 3,960,598 $ 33,531 $ (33,173 ) $ 3,960,956 December 31, 2016 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 407,478 $ 2,531 $ (1,294 ) $ 408,715 Debt Securities Issued by States and Political Subdivisions 662,231 11,455 (1,887 ) 671,799 Debt Securities Issued by Corporations 273,044 5 (3,870 ) 269,179 Mortgage-Backed Securities: Residential - Government Agencies 240,412 4,577 (1,145 ) 243,844 Residential - U.S. Government-Sponsored Enterprises 511,234 971 (5,218 ) 506,987 Commercial - Government Agencies 89,544 — (4,027 ) 85,517 Total Mortgage-Backed Securities 841,190 5,548 (10,390 ) 836,348 Total $ 2,183,943 $ 19,539 $ (17,441 ) $ 2,186,041 Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 530,149 $ 1,562 $ (771 ) $ 530,940 Debt Securities Issued by States and Political Subdivisions 242,295 9,991 — 252,286 Debt Securities Issued by Corporations 135,620 416 (1,528 ) 134,508 Mortgage-Backed Securities: Residential - Government Agencies 1,940,076 20,567 (23,861 ) 1,936,782 Residential - U.S. Government-Sponsored Enterprises 752,768 798 (10,919 ) 742,647 Commercial - Government Agencies 232,089 940 (2,665 ) 230,364 Total Mortgage-Backed Securities 2,924,933 22,305 (37,445 ) 2,909,793 Total $ 3,832,997 $ 34,274 $ (39,744 ) $ 3,827,527
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 September 30, 2017 . 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 $ 79,756 $ 80,005 Due After One Year Through Five Years 622,846 628,796 Due After Five Years Through Ten Years 164,664 172,362 Due After Ten Years 25,501 27,186 892,767 908,349 Debt Securities Issued by Government Agencies 445,654 448,664 Mortgage-Backed Securities: Residential - Government Agencies 247,418 249,976 Residential - U.S. Government-Sponsored Enterprises 646,013 642,113 Commercial - Government Agencies 76,260 73,566 Total Mortgage-Backed Securities 969,691 965,655 Total $ 2,308,112 $ 2,322,668 Held-to-Maturity: Due in One Year or Less $ 240,105 $ 239,988 Due After One Year Through Five Years 255,274 257,753 Due After Five Years Through Ten Years 254,585 262,701 Due After Ten Years 38,244 41,016 788,208 801,458 Mortgage-Backed Securities: Residential - Government Agencies 2,168,568 2,162,036 Residential - U.S. Government-Sponsored Enterprises 795,992 790,711 Commercial - Government Agencies 207,830 206,751 Total Mortgage-Backed Securities 3,172,390 3,159,498 Total $ 3,960,598 $ 3,960,956
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 and nine months ended September 30, 2017 and 2016 . Three Months Ended Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Gross Gains on Sales of Investment Securities $ — $ — $ 12,467 $ 11,180 Gross Losses on Sales of Investment Securities (566 ) (328 ) (1,420 ) (640 ) Net Gains (Losses) on Sales of Investment Securities $ (566 ) $ (328 ) $ 11,047 $ 10,540
Schedule of investment securities in an unrealized loss position	The Company’s investment securities in an unrealized loss position, segregated by continuous length of loss, 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 September 30, 2017 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 77,995 $ (420 ) $ 152,914 $ (533 ) $ 230,909 $ (953 ) Debt Securities Issued by States and Political Subdivisions 11,064 (20 ) 746 (3 ) 11,810 (23 ) Debt Securities Issued by Corporations 22,995 (8 ) 202,713 (2,297 ) 225,708 (2,305 ) Mortgage-Backed Securities: Residential - Government Agencies 17,046 (4 ) 12,048 (1,043 ) 29,094 (1,047 ) Residential - U.S. Government-Sponsored Enterprises 389,869 (3,512 ) 55,238 (1,444 ) 445,107 (4,956 ) Commercial - Government Agencies — — 73,566 (2,694 ) 73,566 (2,694 ) Total Mortgage-Backed Securities 406,915 (3,516 ) 140,852 (5,181 ) 547,767 (8,697 ) Total $ 518,969 $ (3,964 ) $ 497,225 $ (8,014 ) $ 1,016,194 $ (11,978 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 159,956 $ (238 ) $ 49,804 $ (497 ) $ 209,760 $ (735 ) Debt Securities Issued by Corporations 46,726 (716 ) 14,589 (440 ) 61,315 (1,156 ) Mortgage-Backed Securities: Residential - Government Agencies 897,044 (6,532 ) 516,479 (14,781 ) 1,413,523 (21,313 ) Residential - U.S. Government-Sponsored Enterprises 508,545 (4,881 ) 59,202 (2,037 ) 567,747 (6,918 ) Commercial - Government Agencies 32,799 (573 ) 55,820 (2,478 ) 88,619 (3,051 ) Total Mortgage-Backed Securities 1,438,388 (11,986 ) 631,501 (19,296 ) 2,069,889 (31,282 ) Total $ 1,645,070 $ (12,940 ) $ 695,894 $ (20,233 ) $ 2,340,964 $ (33,173 ) December 31, 2016 Available-for-Sale: Debt Securities Issued by the U.S. Treasury and Government Agencies $ 143,715 $ (562 ) $ 89,211 $ (732 ) $ 232,926 $ (1,294 ) Debt Securities Issued by States and Political Subdivisions 211,188 (1,873 ) 6,725 (14 ) 217,913 (1,887 ) Debt Securities Issued by Corporations 67,332 (714 ) 196,838 (3,156 ) 264,170 (3,870 ) Mortgage-Backed Securities: Residential - Government Agencies 38,355 (89 ) 11,185 (1,056 ) 49,540 (1,145 ) Residential - U.S. Government-Sponsored Enterprises 397,385 (5,218 ) — — 397,385 (5,218 ) Commercial - Government Agencies 5,097 (164 ) 80,420 (3,863 ) 85,517 (4,027 ) Total Mortgage-Backed Securities 440,837 (5,471 ) 91,605 (4,919 ) 532,442 (10,390 ) Total $ 863,072 $ (8,620 ) $ 384,379 $ (8,821 ) $ 1,247,451 $ (17,441 ) Held-to-Maturity: Debt Securities Issued by the U.S. Treasury $ 169,926 $ (771 ) $ — $ — $ 169,926 $ (771 ) Debt Securities Issued by Corporations 69,601 (971 ) 15,933 (557 ) 85,534 (1,528 ) Mortgage-Backed Securities: Residential - Government Agencies 835,227 (15,313 ) 231,377 (8,548 ) 1,066,604 (23,861 ) Residential - U.S. Government-Sponsored Enterprises 693,047 (10,919 ) — — 693,047 (10,919 ) Commercial - Government Agencies 87,586 (2,597 ) 18,653 (68 ) 106,239 (2,665 ) Total Mortgage-Backed Securities 1,615,860 (28,829 ) 250,030 (8,616 ) 1,865,890 (37,445 ) Total $ 1,855,387 $ (30,571 ) $ 265,963 $ (9,173 ) $ 2,121,350 $ (39,744 )
Schedule of interest income from taxable and non-taxable investment securities	Interest income from taxable and non-taxable investment securities for the three and nine months ended September 30, 2017 and 2016 were as follows: Three Months Ended Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Taxable $ 27,441 $ 24,558 $ 79,949 $ 76,112 Non-Taxable 4,880 5,070 14,915 15,410 Total Interest Income from Investment Securities $ 32,321 $ 29,628 $ 94,864 $ 91,522
Schedule of carrying value of company's Federal Home Loan Bank and Federal Reserve Bank	As of September 30, 2017 and December 31, 2016 , the carrying value of the Company’s Federal Home Loan Bank of Des Moines stock and Federal Reserve Bank stock was as follows: (dollars in thousands) September 30, December 31, Federal Home Loan Bank Stock $ 20,000 $ 20,000 Federal Reserve Bank Stock 20,645 20,063 Total $ 40,645 $ 40,063

Loans and Leases and the Allo24

Loans and Leases and the Allowance for Loan and Lease Losses (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 : (dollars in thousands) September 30, December 31, Commercial Commercial and Industrial $ 1,252,238 $ 1,249,791 Commercial Mortgage 2,050,998 1,889,551 Construction 232,487 270,018 Lease Financing 204,240 208,332 Total Commercial 3,739,963 3,617,692 Consumer Residential Mortgage 3,366,634 3,163,073 Home Equity 1,528,353 1,334,163 Automobile 506,102 454,333 Other 1 432,904 380,524 Total Consumer 5,833,993 5,332,093 Total Loans and Leases $ 9,573,956 $ 8,949,785 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 and nine months ended September 30, 2017 and 2016 . 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 September 30, 2017 and 2016 . (dollars in thousands) Commercial Consumer Total Three Months Ended September 30, 2017 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 66,182 $ 40,171 $ 106,353 Loans and Leases Charged-Off (611 ) (5,607 ) (6,218 ) Recoveries on Loans and Leases Previously Charged-Off 598 2,148 2,746 Net Loans and Leases Recovered (Charged-Off) (13 ) (3,459 ) (3,472 ) Provision for Credit Losses 295 3,705 4,000 Balance at End of Period $ 66,464 $ 40,417 $ 106,881 Nine Months Ended September 30, 2017 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 65,680 $ 38,593 $ 104,273 Loans and Leases Charged-Off (909 ) (16,500 ) (17,409 ) Recoveries on Loans and Leases Previously Charged-Off 1,200 6,167 7,367 Net Loans and Leases Recovered (Charged-Off) 291 (10,333 ) (10,042 ) Provision for Credit Losses 493 12,157 12,650 Balance at End of Period $ 66,464 $ 40,417 $ 106,881 As of September 30, 2017 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 136 $ 3,762 $ 3,898 Collectively Evaluated for Impairment 66,328 36,655 102,983 Total $ 66,464 $ 40,417 $ 106,881 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 21,738 $ 39,385 $ 61,123 Collectively Evaluated for Impairment 3,718,225 5,794,608 9,512,833 Total $ 3,739,963 $ 5,833,993 $ 9,573,956 Three Months Ended September 30, 2016 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 62,029 $ 41,903 $ 103,932 Loans and Leases Charged-Off (209 ) (4,707 ) (4,916 ) Recoveries on Loans and Leases Previously Charged-Off 296 2,221 2,517 Net Loans and Leases Recovered (Charged-Off) 87 (2,486 ) (2,399 ) Provision for Credit Losses 442 2,058 2,500 Balance at End of Period $ 62,558 $ 41,475 $ 104,033 Nine Months Ended September 30, 2016 Allowance for Loan and Lease Losses: Balance at Beginning of Period $ 60,714 $ 42,166 $ 102,880 Loans and Leases Charged-Off (670 ) (12,888 ) (13,558 ) Recoveries on Loans and Leases Previously Charged-Off 7,619 5,592 13,211 Net Loans and Leases Recovered (Charged-Off) 6,949 (7,296 ) (347 ) Provision for Credit Losses (5,105 ) 6,605 1,500 Balance at End of Period $ 62,558 $ 41,475 $ 104,033 As of September 30, 2016 Allowance for Loan and Lease Losses: Individually Evaluated for Impairment $ 11 $ 3,436 $ 3,447 Collectively Evaluated for Impairment 62,547 38,039 100,586 Total $ 62,558 $ 41,475 $ 104,033 Recorded Investment in Loans and Leases: Individually Evaluated for Impairment $ 21,793 $ 38,450 $ 60,243 Collectively Evaluated for Impairment 3,467,761 5,166,093 8,633,854 Total $ 3,489,554 $ 5,204,543 $ 8,694,097
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 September 30, 2017 and December 31, 2016 . September 30, 2017 (dollars in thousands) Commercial and Industrial Commercial Mortgage Construction Lease Financing Total Commercial Pass $ 1,206,294 $ 1,997,523 $ 231,033 $ 203,806 $ 3,638,656 Special Mention 18,593 30,744 13 — 49,350 Classified 27,351 22,731 1,441 434 51,957 Total $ 1,252,238 $ 2,050,998 $ 232,487 $ 204,240 $ 3,739,963 (dollars in thousands) Residential Mortgage Home Equity Automobile Other 1 Total Consumer Pass $ 3,357,447 $ 1,521,919 $ 505,296 $ 432,211 $ 5,816,873 Special Mention — 1,764 — — 1,764 Classified 9,187 4,670 806 693 15,356 Total $ 3,366,634 $ 1,528,353 $ 506,102 $ 432,904 $ 5,833,993 Total Recorded Investment in Loans and Leases $ 9,573,956 December 31, 2016 (dollars in thousands) Commercial and Industrial Commercial Mortgage Construction Lease Financing Total Commercial Pass $ 1,203,025 $ 1,792,119 $ 264,287 $ 207,386 $ 3,466,817 Special Mention 20,253 66,734 4,218 5 91,210 Classified 26,513 30,698 1,513 941 59,665 Total $ 1,249,791 $ 1,889,551 $ 270,018 $ 208,332 $ 3,617,692 (dollars in thousands) Residential Mortgage Home Equity Automobile Other 1 Total Consumer Pass $ 3,149,294 $ 1,327,676 $ 453,439 $ 379,793 $ 5,310,202 Special Mention — 2,964 — — 2,964 Classified 13,779 3,523 894 731 18,927 Total $ 3,163,073 $ 1,334,163 $ 454,333 $ 380,524 $ 5,332,093 Total Recorded Investment in Loans and Leases $ 8,949,785 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 September 30, 2017 and December 31, 2016 . (dollars in thousands) 30 - 59 Days Past Due 60 - 89 Days Past Due Past Due 90 Days or More Non-Accrual Total Past Due and Non-Accrual Current Total Loans and Leases Non-Accrual Loans and Leases that are Current 2 As of September 30, 2017 Commercial Commercial and Industrial $ 2,063 $ 206 $ 5 $ 901 $ 3,175 $ 1,249,063 $ 1,252,238 $ 162 Commercial Mortgage 1,321 619 — 1,425 3,365 2,047,633 2,050,998 404 Construction — — — — — 232,487 232,487 — Lease Financing — — — — — 204,240 204,240 — Total Commercial 3,384 825 5 2,326 6,540 3,733,423 3,739,963 566 Consumer Residential Mortgage 3,838 1,456 2,933 9,188 17,415 3,349,219 3,366,634 1,517 Home Equity 2,588 1,017 1,392 4,128 9,125 1,519,228 1,528,353 1,300 Automobile 9,743 1,623 806 — 12,172 493,930 506,102 — Other 1 2,772 1,912 1,528 — 6,212 426,692 432,904 — Total Consumer 18,941 6,008 6,659 13,316 44,924 5,789,069 5,833,993 2,817 Total $ 22,325 $ 6,833 $ 6,664 $ 15,642 $ 51,464 $ 9,522,492 $ 9,573,956 $ 3,383 As of December 31, 2016 Commercial Commercial and Industrial $ 10,698 $ 1,016 $ — $ 151 $ 11,865 $ 1,237,926 $ 1,249,791 $ — Commercial Mortgage 128 17 — 997 1,142 1,888,409 1,889,551 416 Construction — — — — — 270,018 270,018 — Lease Financing — — — — — 208,332 208,332 — Total Commercial 10,826 1,033 — 1,148 13,007 3,604,685 3,617,692 416 Consumer Residential Mortgage 6,491 106 3,127 13,780 23,504 3,139,569 3,163,073 1,628 Home Equity 3,063 2,244 1,457 3,147 9,911 1,324,252 1,334,163 1,015 Automobile 11,692 2,162 894 — 14,748 439,585 454,333 — Other 1 3,200 1,532 1,592 — 6,324 374,200 380,524 — Total Consumer 24,446 6,044 7,070 16,927 54,487 5,277,606 5,332,093 2,643 Total $ 35,272 $ 7,077 $ 7,070 $ 18,075 $ 67,494 $ 8,882,291 $ 8,949,785 $ 3,059 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 September 30, 2017 and December 31, 2016 . (dollars in thousands) Recorded Investment Unpaid Principal Balance Related Allowance for Loan Losses September 30, 2017 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,967 $ 16,279 $ — Commercial Mortgage 9,450 12,950 — Construction 1,441 1,440 — Total Commercial 19,858 30,669 — Total Impaired Loans with No Related Allowance Recorded $ 19,858 $ 30,669 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 656 $ 656 $ 14 Commercial Mortgage 1,224 1,224 122 Total Commercial 1,880 1,880 136 Consumer Residential Mortgage 21,401 26,140 3,117 Home Equity 1,810 1,810 267 Automobile 13,612 13,612 304 Other 1 2,562 2,562 74 Total Consumer 39,385 44,124 3,762 Total Impaired Loans with an Allowance Recorded $ 41,265 $ 46,004 $ 3,898 Impaired Loans: Commercial $ 21,738 $ 32,549 $ 136 Consumer 39,385 44,124 3,762 Total Impaired Loans $ 61,123 $ 76,673 $ 3,898 December 31, 2016 Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 9,556 $ 16,518 $ — Commercial Mortgage 9,373 12,873 — Construction 1,513 1,513 — Total Commercial 20,442 30,904 — Total Impaired Loans with No Related Allowance Recorded $ 20,442 $ 30,904 $ — Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 765 $ 765 $ 24 Commercial Mortgage 365 365 21 Total Commercial 1,130 1,130 45 Consumer Residential Mortgage 25,625 30,615 3,224 Home Equity 1,516 1,516 15 Automobile 9,660 9,660 206 Other 1 2,325 2,325 65 Total Consumer 39,126 44,116 3,510 Total Impaired Loans with an Allowance Recorded $ 40,256 $ 45,246 $ 3,555 Impaired Loans: Commercial $ 21,572 $ 32,034 $ 45 Consumer 39,126 44,116 3,510 Total Impaired Loans $ 60,698 $ 76,150 $ 3,555 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 and nine months ended September 30, 2017 and 2016 . Three Months Ended Three Months Ended (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,592 $ 106 $ 9,762 $ 115 Commercial Mortgage 9,512 61 9,848 90 Construction 1,453 23 1,548 25 Total Commercial 19,557 190 21,158 230 Total Impaired Loans with No Related Allowance Recorded $ 19,557 $ 190 $ 21,158 $ 230 Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 640 $ 11 $ 681 $ 27 Commercial Mortgage 771 31 194 5 Total Commercial 1,411 42 875 32 Consumer Residential Mortgage 21,674 209 27,172 235 Home Equity 1,773 20 1,428 15 Automobile 12,895 217 7,908 129 Other 1 2,615 52 2,064 44 Total Consumer 38,957 498 38,572 423 Total Impaired Loans with an Allowance Recorded $ 40,368 $ 540 $ 39,447 $ 455 Impaired Loans: Commercial $ 20,968 $ 232 $ 22,033 $ 262 Consumer 38,957 498 38,572 423 Total Impaired Loans $ 59,925 $ 730 $ 60,605 $ 685 Nine Months Ended Nine Months Ended (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Impaired Loans with No Related Allowance Recorded: Commercial Commercial and Industrial $ 8,989 $ 248 $ 11,061 $ 333 Commercial Mortgage 9,390 223 10,040 252 Construction 1,477 71 1,570 76 Total Commercial 19,856 542 22,671 661 Total Impaired Loans with No Related Allowance Recorded $ 19,856 $ 542 $ 22,671 $ 661 Impaired Loans with an Allowance Recorded: Commercial Commercial and Industrial $ 684 $ 31 $ 983 $ 59 Commercial Mortgage 562 39 97 5 Total Commercial 1,246 70 1,080 64 Consumer Residential Mortgage 23,331 635 27,889 736 Home Equity 1,642 57 1,365 50 Automobile 11,592 581 7,553 376 Other 1 2,553 162 1,922 126 Total Consumer 39,118 1,435 38,729 1,288 Total Impaired Loans with an Allowance Recorded $ 40,364 $ 1,505 $ 39,809 $ 1,352 Impaired Loans: Commercial $ 21,102 $ 612 $ 23,751 $ 725 Consumer 39,118 1,435 38,729 1,288 Total Impaired Loans $ 60,220 $ 2,047 $ 62,480 $ 2,013 1 Comprised of other revolving credit and installment financing.
Schedule of Loans Modified in a TDR and TDRs that Defaulted During the Period Within 12 mos of Modification Date	The following presents by class, information related to loans modified in a TDR during the three and nine months ended September 30, 2017 and 2016 . Loans Modified as a TDR for the Loans Modified as a TDR for the 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 1 $ 198 $ — 4 $ 97 $ 1 Commercial Mortgage 2 1,307 93 1 208 2 Total Commercial 3 1,505 93 5 305 3 Consumer Residential Mortgage — — — 3 547 258 Home Equity 2 203 1 — — — Automobile 123 2,636 59 79 1,678 38 Other 2 34 383 9 62 510 14 Total Consumer 159 3,222 69 144 2,735 310 Total 162 $ 4,727 $ 162 149 $ 3,040 $ 313 Loans Modified as a TDR for the Loans Modified as a TDR for the 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 12 $ 7,485 $ 12 6 $ 3,084 $ 1 Commercial Mortgage 3 2,007 93 1 208 2 Total Commercial 15 9,492 105 7 3,292 3 Consumer Residential Mortgage — — — 8 3,025 274 Home Equity 3 442 5 1 476 5 Automobile 326 6,657 149 184 3,617 82 Other 2 136 1,131 28 155 1,127 31 Total Consumer 465 8,230 182 348 8,245 392 Total 480 $ 17,722 $ 287 355 $ 11,537 $ 395 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 and nine months ended September 30, 2017 and 2016 , 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 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 Automobile 15 $ 373 1 $ 3 Other 2 13 83 — — Total Consumer 28 456 1 3 Total 28 $ 456 1 $ 3 Nine Months Ended Nine Months Ended 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 Commercial Commercial and Industrial 1 $ 49 — $ — Total Commercial 1 49 — — Consumer Residential Mortgage — — 3 1,044 Home Equity — — 1 158 Automobile 23 551 3 47 Other 2 33 184 18 110 Total Consumer 56 735 25 1,359 Total 57 $ 784 25 $ 1,359 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)	9 Months Ended
	Sep. 30, 2017
Transfers and Servicing of Financial Assets [Abstract]
Analysis of mortgage servicing rights accounted for under the fair value measurement method	For the three and nine months ended September 30, 2017 and 2016 , 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 Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Balance at Beginning of Period $ 1,548 $ 1,819 $ 1,655 $ 1,970 Change in Fair Value: Due to Payoffs (39 ) (79 ) (146 ) (230 ) Total Changes in Fair Value of Mortgage Servicing Rights (39 ) (79 ) (146 ) (230 ) Balance at End of Period $ 1,509 $ 1,740 $ 1,509 $ 1,740
Analysis of mortgage servicing rights accounted for under the amortization method	For the three and nine months ended September 30, 2017 and 2016 , 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 Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Balance at Beginning of Period $ 22,923 $ 17,812 $ 22,008 $ 21,032 Servicing Rights that Resulted From Asset Transfers 900 1,670 3,176 2,441 Amortization (739 ) (780 ) (2,047 ) (2,093 ) Valuation Allowance Provision (157 ) 549 (210 ) (2,129 ) Balance at End of Period $ 22,927 $ 19,251 $ 22,927 $ 19,251 Valuation Allowance: Balance at Beginning of Period $ (53 ) $ (2,699 ) $ — $ (21 ) Valuation Allowance Provision (157 ) 549 (210 ) (2,129 ) Balance at End of Period $ (210 ) $ (2,150 ) $ (210 ) $ (2,150 ) Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method Beginning of Period $ 25,479 $ 17,812 $ 25,148 $ 24,804 End of Period $ 23,761 $ 19,177 $ 23,761 $ 19,177
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 September 30, 2017 and December 31, 2016 were as follows: September 30, December 31, 2016 Weighted-Average Constant Prepayment Rate 1 9.21 % 8.13 % Weighted-Average Life (in years) 6.88 7.43 Weighted-Average Note Rate 4.06 % 4.10 % Weighted-Average Discount Rate 2 8.89 % 9.33 % 1 Represents annualized loan repayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield 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 September 30, 2017 and December 31, 2016 is presented in the following table. (dollars in thousands) September 30, December 31, Constant Prepayment Rate Decrease in fair value from 25 basis points (“bps”) adverse change $ (284 ) $ (321 ) Decrease in fair value from 50 bps adverse change (563 ) (636 ) Discount Rate Decrease in fair value from 25 bps adverse change (255 ) (288 ) Decrease in fair value from 50 bps adverse change (504 ) (570 )

Low Income Housing Tax Credit26

Low Income Housing Tax Credit Partnerships (Tables)	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	As of September 30, 2017 , the expected payments for unfunded affordable housing commitments were as follows: (dollars in thousands) Amount 2017 $ 8,760 2018 14,164 2019 2,382 2020 51 2021 37 Thereafter 1,065 Total Unfunded Commitments $ 26,459 The following table presents tax credits and other tax benefits recognized and amortization expense related to affordable housing for the three and nine months ended September 30, 2017 and 2016 . Three Months Ended Nine Months Ended (dollars in thousands) 2017 2016 2017 2016 Effective Yield Method Tax credits and other tax benefits recognized $ 3,414 $ 3,352 $ 10,282 $ 10,384 Amortization Expense in Provision for Income Taxes 2,105 1,319 6,403 5,667 Proportional Amortization Method Tax credits and other tax benefits recognized $ 440 $ 259 $ 1,201 $ 777 Amortization Expense in Provision for Income Taxes 358 200 969 600

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2017
Offsetting [Abstract]
Schedule of Repurchase Agreements - by maturity date and collateral type	The following table presents the remaining contractual maturities of the Company’s repurchase agreements as of September 30, 2017 and December 31, 2016 , disaggregated by the class of collateral pledged. Remaining Contractual Maturity of Repurchase Agreements (dollars in thousands) Up to 91-365 days 1-3 Years After Total September 30, 2017 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 69,717 $ 243,168 $ 312,885 Debt Securities Issued by States and Political Subdivisions 1,198 3,300 — — 4,498 Mortgage-Backed Securities: Residential - Government Agencies 795 — — 98,253 99,048 Residential - U.S. Government-Sponsored Enterprises — — 5,283 83,579 88,862 Total $ 1,993 $ 3,300 $ 75,000 $ 425,000 $ 505,293 December 31, 2016 Class of Collateral Pledged: Debt Securities Issued by the U.S. Treasury and Government Agencies $ — $ — $ 200,000 $ 104,681 $ 304,681 Debt Securities Issued by States and Political Subdivisions 22,050 590 — — 22,640 Mortgage-Backed Securities: Residential - Government Agencies 738 — — 97,281 98,019 Residential - U.S. Government-Sponsored Enterprises — — — 98,038 98,038 Total $ 22,788 $ 590 $ 200,000 $ 300,000 $ 523,378
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 September 30, 2017 and December 31, 2016 . 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. As previously mentioned, centrally cleared swap agreements between the Company and institutional counterparties are also excluded from this table. (i) (ii) (iii) = (i)-(ii) (iv) (v) = (iii)-(iv) Gross Amounts Recognized in the Statements of Condition Gross Amounts Offset in the Statements of Condition Net Amounts Presented in the Statements of Condition Gross Amounts Not Offset in the Statements of Condition (dollars in thousands) Netting Adjustments per Master Netting Arrangements Fair Value of Collateral Pledged 1 Net Amount September 30, 2017 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 4,168 $ — $ 4,168 $ 4,168 $ — $ — Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 5,998 — 5,998 4,168 1,830 — Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 5,293 — 5,293 — 5,293 — $ 505,293 $ — $ 505,293 $ — $ 505,293 $ — December 31, 2016 Assets: Interest Rate Swap Agreements: Institutional Counterparties $ 5,094 $ — $ 5,094 $ 5,094 $ — $ — Liabilities: Interest Rate Swap Agreements: Institutional Counterparties 6,489 — 6,489 5,094 500 895 Repurchase Agreements: Private Institutions 500,000 — 500,000 — 500,000 — Government Entities 23,378 — 23,378 — 23,378 — $ 523,378 $ — $ 523,378 $ — $ 523,378 $ — 1 The application of collateral cannot reduce the net amount below zero. Therefore, excess collateral is not reflected in this column. For swap agreements with institutional counterparties, the fair value of investment securities pledged was $6.0 million as of September 30, 2017. For repurchase agreements with private institutions, the fair value of investment securities pledged was $567.3 million and $599.3 million as of September 30, 2017 and December 31, 2016 , respectively. For repurchase agreements with government entities, the fair value of investment securities pledged was $7.0 million and $28.9 million as of September 30, 2017 and December 31, 2016 , respectively.

Accumulated Other Comprehensi28

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : (dollars in thousands) Before Tax Tax Effect Net of Tax Three Months Ended September 30, 2017 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ 236 $ 93 $ 143 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 497 196 301 Net Unrealized Gains (Losses) on Investment Securities 733 289 444 Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 322 127 195 Amortization of Prior Service Credit (81 ) (32 ) (49 ) Defined Benefit Plans, Net 241 95 146 Other Comprehensive Income (Loss) $ 974 $ 384 $ 590 Three Months Ended September 30, 2016 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ (9,420 ) $ (3,719 ) $ (5,701 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 286 113 173 Net Unrealized Gains (Losses) on Investment Securities (9,134 ) (3,606 ) (5,528 ) Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 314 124 190 Amortization of Prior Service Credit (81 ) (31 ) (50 ) Defined Benefit Plans, Net 233 93 140 Other Comprehensive Income (Loss) $ (8,901 ) $ (3,513 ) $ (5,388 ) Nine Months Ended September 30, 2017 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ 12,458 $ 4,917 $ 7,541 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 1,492 589 903 Net Unrealized Gains (Losses) on Investment Securities 13,950 5,506 8,444 Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 967 382 585 Amortization of Prior Service Credit (242 ) (96 ) (146 ) Defined Benefit Plans, Net 725 286 439 Other Comprehensive Income (Loss) $ 14,675 $ 5,792 $ 8,883 Nine Months Ended September 30, 2016 Net Unrealized Gains (Losses) on Investment Securities: Net Unrealized Gains (Losses) Arising During the Period $ 12,804 $ 5,055 $ 7,749 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1 949 375 574 Net Unrealized Gains (Losses) on Investment Securities 13,753 5,430 8,323 Defined Benefit Plans: Amortization of Net Actuarial Losses (Gains) 940 371 569 Amortization of Prior Service Credit (242 ) (95 ) (147 ) Defined Benefit Plans, Net 698 276 422 Other Comprehensive Income (Loss) $ 14,451 $ 5,706 $ 8,745 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 and nine months ended September 30, 2017 and 2016 : (dollars in thousands) Investment Securities-Available-for-Sale Investment Securities-Held-to-Maturity Defined Benefit Plans Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, 2017 Balance at Beginning of Period $ 8,668 $ (5,682 ) $ (28,599 ) $ (25,613 ) Other Comprehensive Income (Loss) Before Reclassifications 143 — — 143 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 301 146 447 Total Other Comprehensive Income (Loss) 143 301 146 590 Balance at End of Period $ 8,811 $ (5,381 ) $ (28,453 ) $ (25,023 ) Three Months Ended September 30, 2016 Balance at Beginning of Period $ 26,009 $ (6,854 ) $ (28,579 ) $ (9,424 ) Other Comprehensive Income (Loss) Before Reclassifications (5,701 ) — — (5,701 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 173 140 313 Total Other Comprehensive Income (Loss) (5,701 ) 173 140 (5,388 ) Balance at End of Period $ 20,308 $ (6,681 ) $ (28,439 ) $ (14,812 ) Nine Months Ended September 30, 2017 Balance at Beginning of Period $ 1,270 $ (6,284 ) $ (28,892 ) $ (33,906 ) Other Comprehensive Income (Loss) Before Reclassifications 7,541 — — 7,541 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 903 439 1,342 Total Other Comprehensive Income (Loss) 7,541 903 439 8,883 Balance at End of Period $ 8,811 $ (5,381 ) $ (28,453 ) $ (25,023 ) Nine Months Ended September 30, 2016 Balance at Beginning of Period $ 12,559 $ (7,255 ) $ (28,861 ) $ (23,557 ) Other Comprehensive Income (Loss) Before Reclassifications 7,749 — — 7,749 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 574 422 996 Total Other Comprehensive Income (Loss) 7,749 574 422 8,745 Balance at End of Period $ 20,308 $ (6,681 ) $ (28,439 ) $ (14,812 )
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 and nine months ended September 30, 2017 and 2016 : Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 1 Affected Line Item in the Statement Where Net Income Is Presented Three Months Ended September 30, (dollars in thousands) 2017 2016 Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity $ (497 ) $ (286 ) Interest Income 196 113 Provision for Income Tax (301 ) (173 ) Net of Tax Amortization of Defined Benefit Plan Items Prior Service Credit 2 81 81 Net Actuarial Losses 2 (322 ) (314 ) (241 ) (233 ) Total Before Tax 95 93 Provision for Income Tax (146 ) (140 ) Net of Tax Total Reclassifications for the Period $ (447 ) $ (313 ) Net of Tax Details about Accumulated Other Comprehensive Income (Loss) Components Amount Reclassified from Accumulated Other Comprehensive Income (Loss) 1 Affected Line Item in the Statement Where Net Income Is Presented Nine Months Ended September 30, (dollars in thousands) 2017 2016 Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity $ (1,492 ) $ (949 ) Interest Income 589 375 Provision for Income Tax (903 ) (574 ) Net of Tax Amortization of Defined Benefit Plan Items Prior Service Credit 2 242 242 Net Actuarial Losses 2 (967 ) (940 ) (725 ) (698 ) Total Before Tax 286 276 Provision for Income Tax (439 ) (422 ) Net of Tax Total Reclassifications for the Period $ (1,342 ) $ (996 ) 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 Pension Plans and Postretirement Benefit Plan for additional details).

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Three Months Ended Nine Months Ended 2017 2016 2017 2016 Denominator for Basic Earnings Per Share 42,251,541 42,543,122 42,336,441 42,730,571 Dilutive Effect of Equity Based Awards 313,823 235,224 325,722 216,488 Denominator for Diluted Earnings Per Share 42,565,364 42,778,346 42,662,163 42,947,059 Antidilutive Stock Options and Restricted Stock Outstanding 1,070 — 363 —

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Selected Business Segment Financial Information	Selected business segment financial information as of and for the three and nine months ended September 30, 2017 and 2016 were as follows: (dollars in thousands) Retail Banking Commercial Banking Investment Services and Private Banking Treasury and Other Consolidated Total Three Months Ended September 30, 2017 Net Interest Income $ 67,128 $ 43,438 $ 7,321 $ (1,570 ) $ 116,317 Provision for Credit Losses 3,512 (35 ) (5 ) 528 4,000 Net Interest Income After Provision for Credit Losses 63,616 43,473 7,326 (2,098 ) 112,317 Noninterest Income 21,287 5,137 13,593 2,393 42,410 Noninterest Expense (51,507 ) (17,721 ) (14,925 ) (4,445 ) (88,598 ) Income Before Provision for Income Taxes 33,396 30,889 5,994 (4,150 ) 66,129 Provision for Income Taxes (11,908 ) (10,891 ) (2,218 ) 4,769 (20,248 ) Net Income $ 21,488 $ 19,998 $ 3,776 $ 619 $ 45,881 Total Assets as of September 30, 2017 $ 5,758,799 $ 3,695,606 $ 305,015 $ 7,508,882 $ 17,268,302 Three Months Ended September 30, 2016 Net Interest Income $ 61,747 $ 38,613 $ 6,029 $ (2,477 ) $ 103,912 Provision for Credit Losses 2,574 (168 ) (7 ) 101 2,500 Net Interest Income After Provision for Credit Losses 59,173 38,781 6,036 (2,578 ) 101,412 Noninterest Income 24,786 6,977 13,662 2,689 48,114 Noninterest Expense (51,892 ) (17,449 ) (14,579 ) (3,612 ) (87,532 ) Income Before Provision for Income Taxes 32,067 28,309 5,119 (3,501 ) 61,994 Provision for Income Taxes (11,329 ) (10,073 ) (1,894 ) 4,795 (18,501 ) Net Income $ 20,738 $ 18,236 $ 3,225 $ 1,294 $ 43,493 Total Assets as of September 30, 2016 $ 5,206,442 $ 3,428,424 $ 290,207 $ 7,089,570 $ 16,014,643 Nine Months Ended September 30, 2017 Net Interest Income $ 198,633 $ 127,106 $ 20,685 $ (7,956 ) $ 338,468 Provision for Credit Losses 10,413 (355 ) (16 ) 2,608 12,650 Net Interest Income After Provision for Credit Losses 188,220 127,461 20,701 (10,564 ) 325,818 Noninterest Income 64,132 16,451 43,389 19,590 143,562 Noninterest Expense (155,786 ) (54,483 ) (45,692 ) (9,394 ) (265,355 ) Income Before Provision for Income Taxes 96,566 89,429 18,398 (368 ) 204,025 Provision for Income Taxes (34,323 ) (31,472 ) (6,807 ) 10,296 (62,306 ) Net Income $ 62,243 $ 57,957 $ 11,591 $ 9,928 $ 141,719 Total Assets as of September 30, 2017 $ 5,758,799 $ 3,695,606 $ 305,015 $ 7,508,882 $ 17,268,302 Nine Months Ended September 30, 2016 Net Interest Income $ 179,798 $ 115,112 $ 18,518 $ (2,942 ) $ 310,486 Provision for Credit Losses 7,415 (7,052 ) (18 ) 1,155 1,500 Net Interest Income After Provision for Credit Losses 172,383 122,164 18,536 (4,097 ) 308,986 Noninterest Income 67,364 21,015 43,632 18,829 150,840 Noninterest Expense (155,391 ) (52,479 ) (44,786 ) (8,333 ) (260,989 ) Income Before Provision for Income Taxes 84,356 90,700 17,382 6,399 198,837 Provision for Income Taxes (29,958 ) (32,337 ) (6,431 ) 7,837 (60,889 ) Net Income $ 54,398 $ 58,363 $ 10,951 $ 14,236 $ 137,948 Total Assets as of September 30, 2016 $ 5,206,442 $ 3,428,424 $ 290,207 $ 7,089,570 $ 16,014,643

Pension Plans and Postretirem31

Pension Plans and Postretirement Benefit Plan (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 . Pension Benefits Postretirement Benefits (dollars in thousands) 2017 2016 2017 2016 Three Months Ended September 30, Service Cost $ — $ — $ 123 $ 137 Interest Cost 1,161 1,210 272 294 Expected Return on Plan Assets (1,238 ) (1,282 ) — — Amortization of: Prior Service Credit — — (81 ) (81 ) Net Actuarial Losses (Gains) 433 389 (111 ) (75 ) Net Periodic Benefit Cost $ 356 $ 317 $ 203 $ 275 Nine Months Ended September 30, Service Cost $ — $ — $ 369 $ 411 Interest Cost 3,483 3,628 816 882 Expected Return on Plan Assets (3,714 ) (3,844 ) — — Amortization of: Prior Service Credit — — (242 ) (242 ) Net Actuarial Losses (Gains) 1,298 1,166 (331 ) (226 ) Net Periodic Benefit Cost $ 1,067 $ 950 $ 612 $ 825

Derivative Financial Instrume32

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 were as follows: September 30, 2017 December 31, 2016 (dollars in thousands) Notional Amount Fair Value Notional Amount Fair Value Interest Rate Lock Commitments $ 50,050 $ 958 $ 55,223 $ 1,067 Forward Commitments 51,263 19 104,962 847 Interest Rate Swap Agreements Receive Fixed/Pay Variable Swaps 378,618 2,187 357,441 1,381 Pay Fixed/Receive Variable Swaps 378,618 (1,830 ) 357,441 (1,395 ) Foreign Exchange Contracts 56,130 (677 ) 38,172 (757 )
Derivative financial instruments, their fair values, and balance sheet location	The following table presents the Company’s derivative financial instruments, their fair values, and their location in the consolidated statements of condition as of September 30, 2017 and December 31, 2016 : Derivative Financial Instruments September 30, 2017 December 31, 2016 Not Designated as Hedging Instruments 1 Asset Liability Asset Liability (dollars in thousands) Derivatives Derivatives Derivatives Derivatives Interest Rate Lock Commitments $ 962 $ 4 $ 1,236 $ 169 Forward Commitments 76 57 873 26 Interest Rate Swap Agreements 10,522 10,165 11,569 11,583 Foreign Exchange Contracts 26 703 53 810 Total $ 11,586 $ 10,929 $ 13,731 $ 12,588 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 or losses recognized in the consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 : Location of Derivative Financial Instruments Net Gains (Losses) Three Months Ended Nine Months Ended Not Designated as Hedging Instruments Recognized in the September 30, September 30, (dollars in thousands) Statements of Income 2017 2016 2017 2016 Interest Rate Lock Commitments Mortgage Banking $ 1,550 $ 4,154 $ 4,472 $ 8,113 Forward Commitments Mortgage Banking (434 ) (934 ) (1,322 ) (2,430 ) Interest Rate Swap Agreements Other Noninterest Income 10 1,595 690 2,416 Foreign Exchange Contracts Other Noninterest Income 754 772 2,600 2,245 Total $ 1,880 $ 5,587 $ 6,440 $ 10,344

Commitments, Contingencies, a33

Commitments, Contingencies, and Guarantees (Tables)	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Credit commitments	The Company’s credit commitments as of September 30, 2017 and December 31, 2016 were as follows: (dollars in thousands) September 30, December 31, Unfunded Commitments to Extend Credit $ 2,793,531 $ 2,732,734 Standby Letters of Credit 122,137 112,830 Commercial Letters of Credit 18,601 16,269 Total Credit Commitments $ 2,934,269 $ 2,861,833

Fair Value of Assets and Liab34

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 : Quoted Prices in Active Markets for Identical Assets or Liabilities Significant Other Observable Inputs Significant Unobservable Inputs (dollars in thousands) (Level 1) (Level 2) (Level 3) Total September 30, 2017 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 541 $ 448,663 $ — $ 449,204 Debt Securities Issued by States and Political Subdivisions — 641,963 — 641,963 Debt Securities Issued by Corporations — 265,846 — 265,846 Mortgage-Backed Securities: Residential - Government Agencies — 249,976 — 249,976 Residential - U.S. Government-Sponsored Enterprises — 642,113 — 642,113 Commercial - Government Agencies — 73,566 — 73,566 Total Mortgage-Backed Securities — 965,655 — 965,655 Total Investment Securities Available-for-Sale 541 2,322,127 — 2,322,668 Loans Held for Sale — 9,752 — 9,752 Mortgage Servicing Rights — — 1,509 1,509 Other Assets 28,064 — — 28,064 Derivatives 1 — 102 11,484 11,586 Total Assets Measured at Fair Value on a $ 28,605 $ 2,331,981 $ 12,993 $ 2,373,579 Liabilities: Derivatives 1 $ — $ 760 $ 10,169 $ 10,929 Total Liabilities Measured at Fair Value on a $ — $ 760 $ 10,169 $ 10,929 December 31, 2016 Assets: Investment Securities Available-for-Sale Debt Securities Issued by the U.S. Treasury and Government Agencies $ 539 $ 408,176 $ — $ 408,715 Debt Securities Issued by States and Political Subdivisions — 671,799 — 671,799 Debt Securities Issued by Corporations — 269,179 — 269,179 Mortgage-Backed Securities: Residential - Government Agencies — 243,844 — 243,844 Residential - U.S. Government-Sponsored Enterprises — 506,987 — 506,987 Commercial - Government Agencies — 85,517 — 85,517 Total Mortgage-Backed Securities — 836,348 — 836,348 Total Investment Securities Available-for-Sale 539 2,185,502 — 2,186,041 Loans Held for Sale — 62,499 — 62,499 Mortgage Servicing Rights — — 1,655 1,655 Other Assets 21,952 — — 21,952 Derivatives 1 — 926 12,805 13,731 Total Assets Measured at Fair Value on a $ 22,491 $ 2,248,927 $ 14,460 $ 2,285,878 Liabilities: Derivatives 1 $ — $ 836 $ 11,752 $ 12,588 Total Liabilities Measured at Fair Value on a $ — $ 836 $ 11,752 $ 12,588 1 The fair value of each class of derivatives is shown in Note 11 Derivative Financial Instruments .
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis	For the three and nine months ended September 30, 2017 and 2016 , the changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows: (dollars in thousands) Mortgage Servicing Rights 1 Net Derivative Assets and Liabilities 2 Three Months Ended September 30, 2017 Balance as of July 1, 2017 $ 1,548 $ 1,369 Realized and Unrealized Net Gains (Losses): Included in Net Income (39 ) 1,561 Transfers to Loans Held for Sale — (1,631 ) Variation Margin Payments — 16 Balance as of September 30, 2017 $ 1,509 $ 1,315 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 1,315 Three Months Ended September 30, 2016 Balance as of July 1, 2016 $ 1,819 $ 1,908 Realized and Unrealized Net Gains (Losses): Included in Net Income (79 ) 4,149 Transfers to Loans Held for Sale — (3,696 ) Balance as of September 30, 2016 $ 1,740 $ 2,361 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 2,361 Nine Months Ended September 30, 2017 Balance as of January 1, 2017 $ 1,655 $ 1,053 Realized and Unrealized Net Gains (Losses): Included in Net Income (146 ) 4,469 Transfers to Loans Held for Sale — (4,581 ) Variation Margin Payments — 374 Balance as of September 30, 2017 $ 1,509 $ 1,315 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 1,315 Nine Months Ended September 30, 2016 Balance as of January 1, 2016 $ 1,970 $ 240 Realized and Unrealized Net Gains (Losses): Included in Net Income (230 ) 8,003 Transfers to Loans Held for Sale — (5,882 ) Balance as of September 30, 2016 $ 1,740 $ 2,361 Total Unrealized Net Gains (Losses) Included in Net Income $ — $ 2,361 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 September 30, 2017 and December 31, 2016 , the significant unobservable inputs used in the fair value measurements were as follows: Significant Unobservable Inputs (weighted-average) Fair Value (dollars in thousands) Valuation Technique Description Sept. 30, Dec. 31, Sept. 30, Dec. 31, Mortgage Servicing Rights Discounted Cash Flow Constant Prepayment Rate 1 9.21 % 8.13 % $ 25,270 $ 26,803 Discount Rate 2 8.89 % 9.33 % Net Derivative Assets and Liabilities: Interest Rate Lock Commitments Pricing Model Closing Ratio 93.40 % 92.26 % $ 958 $ 1,067 Interest Rate Swap Agreements Discounted Cash Flow Credit Factor 0.16 % 0.13 % $ 357 $ (14 ) 1 Represents annualized loan repayment rate assumption. 2 Derived from multiple interest rate scenarios that incorporate a spread to a market yield 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 September 30, 2017 . There were no assets measured at fair value on a nonrecurring basis as of December 31, 2016 . (dollars in thousands) Fair Value Hierarchy Net Carrying Amount Valuation Allowance September 30, 2017 Mortgage Servicing Rights - amortization method Level 3 $ 22,927 $ 210
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 September 30, 2017 and December 31, 2016 . (dollars in thousands) Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Unpaid Principal September 30, 2017 Loans Held for Sale $ 9,752 $ 9,458 $ 294 December 31, 2016 Loans Held for Sale $ 62,499 $ 61,782 $ 717
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 September 30, 2017 and December 31, 2016 . 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 in Active Markets for Identical Assets or Liabilities Significant Other Observable Inputs Significant Unobservable Inputs (dollars in thousands) Amount Fair Value (Level 1) (Level 2) (Level 3) September 30, 2017 Financial Instruments - Assets Investment Securities Held-to-Maturity $ 3,960,598 $ 3,960,956 $ 424,731 $ 3,536,225 $ — Loans 1 9,193,837 9,361,879 — — 9,361,879 Financial Instruments - Liabilities Time Deposits 1,962,092 1,956,957 — 1,956,957 — Securities Sold Under Agreements to Repurchase 505,293 505,278 — 505,278 — Other Debt 2 257,153 256,548 — 256,548 — December 31, 2016 Financial Instruments - Assets Investment Securities Held-to-Maturity $ 3,832,997 $ 3,827,527 $ 530,940 $ 3,296,587 $ — Loans 1 8,583,726 8,743,191 — — 8,743,191 Financial Instruments - Liabilities Time Deposits 1,217,707 1,213,705 — 1,213,705 — Securities Sold Under Agreements to Repurchase 523,378 523,374 — 523,374 — Other Debt 2 257,153 256,718 — 256,718 — 1 Net of unearned income and the Allowance. 2 Excludes capitalized lease obligations.

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Variable Interest Entities) (Details 1) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Unfunded commitments to fund low-income housing partnerships	$ 26,459
Other Assets
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	83,300	$ 78,900
Other Liabilities
Variable Interest Entity [Line Items]
Unfunded commitments to fund low-income housing partnerships	$ 26,500	$ 16,200
Low-income housing partnerships
Variable Interest Entity [Line Items]
Period over which tax credits or benefits are generally recognized (in years)	10 years
Solar energy partnerships
Variable Interest Entity [Line Items]
Period over which tax credits or benefits are generally recognized (in years)	6 years

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Correction of an Immaterial Error to the Financial Statements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Decrease in loans held-for-sale	$ (231,464)	$ (187,117)
Decrease in proceeds from sales of loans held for sale	(238,137)	(152,185)
Decrease in net change in other assets and liabilities	(37,405)	(14,297)
Decrease in net cash provided by operating activities	146,368	123,137
Loans and Leases	9,573,956	8,694,097	$ 8,949,785
Proceeds from Sales of Loans	137,717	118,089
Increase to net cash used in investing activities	(875,040)	(643,909)
Decrease in transfers from loans to loans held for sale	86,625	$ 140,439
Adjustment For Error Correction, YTD 2016 | Immaterial Error From Amounts Incorrectly Reported In Prior Period
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Decrease in loans held-for-sale	136,700
Decrease in proceeds from sales of loans held for sale	116,600
Decrease in net change in other assets and liabilities	100
Decrease in net cash provided by operating activities	20,100
Loans and Leases	138,200
Proceeds from Sales of Loans	118,100
Increase to net cash used in investing activities	20,100
Decrease in transfers from loans to loans held for sale	$ (3,500)

Investment Securities (Amortiza

Investment Securities (Amortization Cost, Gross Unrealized Gains/Losses, and Fair Value) (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 2,308,112	$ 2,183,943
Available-for-Sale: Gross Unrealized Gains	26,534	19,539
Available-for-Sale: Gross Unrealized Losses	(11,978)	(17,441)
Available-for-Sale	2,322,668	2,186,041
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	3,960,598	3,832,997
Held-to-Maturity: Gross Unrealized Gains	33,531	34,274
Held-to-Maturity: Gross Unrealized Losses	(33,173)	(39,744)
Held-to-Maturity: Fair Value	3,960,956	3,827,527
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	446,205	407,478
Available-for-Sale: Gross Unrealized Gains	3,952	2,531
Available-for-Sale: Gross Unrealized Losses	(953)	(1,294)
Available-for-Sale	449,204	408,715
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	624,203	662,231
Available-for-Sale: Gross Unrealized Gains	17,783	11,455
Available-for-Sale: Gross Unrealized Losses	(23)	(1,887)
Available-for-Sale	641,963	671,799
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	268,013	273,044
Available-for-Sale: Gross Unrealized Gains	138	5
Available-for-Sale: Gross Unrealized Losses	(2,305)	(3,870)
Available-for-Sale	265,846	269,179
Residential - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	247,418	240,412
Available-for-Sale: Gross Unrealized Gains	3,605	4,577
Available-for-Sale: Gross Unrealized Losses	(1,047)	(1,145)
Available-for-Sale	249,976	243,844
Residential - U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	646,013	511,234
Available-for-Sale: Gross Unrealized Gains	1,056	971
Available-for-Sale: Gross Unrealized Losses	(4,956)	(5,218)
Available-for-Sale	642,113	506,987
Commercial - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	76,260	89,544
Available-for-Sale: Gross Unrealized Gains	0	0
Available-for-Sale: Gross Unrealized Losses	(2,694)	(4,027)
Available-for-Sale	73,566	85,517
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	969,691	841,190
Available-for-Sale: Gross Unrealized Gains	4,661	5,548
Available-for-Sale: Gross Unrealized Losses	(8,697)	(10,390)
Available-for-Sale	965,655	836,348
Debt Securities Issued by the U.S. Treasury and Government Agencies
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	425,086	530,149
Held-to-Maturity: Gross Unrealized Gains	380	1,562
Held-to-Maturity: Gross Unrealized Losses	(735)	(771)
Held-to-Maturity: Fair Value	424,731	530,940
Debt Securities Issued by States and Political Subdivisions
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	239,462	242,295
Held-to-Maturity: Gross Unrealized Gains	14,283	9,991
Held-to-Maturity: Gross Unrealized Losses	0	0
Held-to-Maturity: Fair Value	253,745	252,286
Debt Securities Issued by Corporations
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	123,660	135,620
Held-to-Maturity: Gross Unrealized Gains	478	416
Held-to-Maturity: Gross Unrealized Losses	(1,156)	(1,528)
Held-to-Maturity: Fair Value	122,982	134,508
Residential - Government Agencies
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	2,168,568	1,940,076
Held-to-Maturity: Gross Unrealized Gains	14,781	20,567
Held-to-Maturity: Gross Unrealized Losses	(21,313)	(23,861)
Held-to-Maturity: Fair Value	2,162,036	1,936,782
Residential - U.S. Government-Sponsored Enterprises
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	795,992	752,768
Held-to-Maturity: Gross Unrealized Gains	1,637	798
Held-to-Maturity: Gross Unrealized Losses	(6,918)	(10,919)
Held-to-Maturity: Fair Value	790,711	742,647
Commercial - Government Agencies
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	207,830	232,089
Held-to-Maturity: Gross Unrealized Gains	1,972	940
Held-to-Maturity: Gross Unrealized Losses	(3,051)	(2,665)
Held-to-Maturity: Fair Value	206,751	230,364
Mortgage-Backed Securities
Held-to-maturity Securities [Abstract]
Held-to-Maturity: Amortized Cost	3,172,390	2,924,933
Held-to-Maturity: Gross Unrealized Gains	18,390	22,305
Held-to-Maturity: Gross Unrealized Losses	(31,282)	(37,445)
Held-to-Maturity: Fair Value	$ 3,159,498	$ 2,909,793

Investment Securities (Contract

Investment Securities (Contractual Maturities and Narrative) (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity[Abstract]
Due in One Year or Less	$ 79,756
Due After One Year Through Five Years	622,846
Due After Five Years Through Ten Years	164,664
Due After Ten Years	25,501
Amortized Cost, Total	892,767
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Due in One Year or Less	80,005
Due After One Year Through Five Years	628,796
Due After Five Years Through Ten Years	172,362
Due After Ten Years	27,186
Fair Value, Total	908,349
Available-for-Sale: Amortized Cost	2,308,112	$ 2,183,943
Available-for-Sale: Fair Value	2,322,668	2,186,041
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract]
Due in One Year or Less	240,105
Due After One Year Through Five Years	255,274
Due After Five Years Through Ten Years	254,585
Due After Ten Years	38,244
Amortized Cost, Total	788,208
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Due in One Year or Less	239,988
Due After One Year Through Five Years	257,753
Due After Five Years Through Ten Years	262,701
Due After Ten Years	41,016
Fair Value, Total	801,458
Held-to-Maturity: Amortized Cost	3,960,598
Held-to-Maturity: Fair Value	3,960,956	3,827,527
Carrying value of investment securities which were pledged to secure deposits of gov't entities and repos	2,700,000	2,400,000
Debt Securities Issued by Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	445,654
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	448,664
Residential - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	247,418
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	249,976
Available-for-Sale: Amortized Cost	247,418	240,412
Available-for-Sale: Fair Value	249,976	243,844
Residential - U.S. Government-Sponsored Enterprises
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	646,013
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	642,113
Available-for-Sale: Amortized Cost	646,013	511,234
Available-for-Sale: Fair Value	642,113	506,987
Commercial - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	76,260
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	73,566
Available-for-Sale: Amortized Cost	76,260	89,544
Available-for-Sale: Fair Value	73,566	85,517
Mortgage-Backed Securities
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Amortized Cost	969,691
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	965,655
Available-for-Sale: Amortized Cost	969,691	841,190
Available-for-Sale: Fair Value	965,655	836,348
Residential - Government Agencies
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	2,168,568
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	2,162,036
Held-to-Maturity: Fair Value	2,162,036	1,936,782
Residential - U.S. Government-Sponsored Enterprises
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	795,992
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	790,711
Held-to-Maturity: Fair Value	790,711	742,647
Commercial - Government Agencies
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	207,830
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	206,751
Held-to-Maturity: Fair Value	206,751	230,364
Mortgage-Backed Securities
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	3,172,390
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	3,159,498
Held-to-Maturity: Fair Value	$ 3,159,498	$ 2,909,793

Investment Securities (Gains an

Investment Securities (Gains and Losses on Sales) (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Gross Gains on Sales of Investment Securities	$ 0	$ 0	$ 12,467	$ 11,180
Gross Losses on Sales of Investment Securities	(566)	(328)	(1,420)	(640)
Net Gains (Losses) on Sales of Investment Securities	$ (566)	$ (328)	$ 11,047	$ 10,540

Investment Securities (Unrealiz

Investment Securities (Unrealized Position - Less than 12 Mos., 12 Mos. or Longer) (Details 4) $ in Thousands	Sep. 30, 2017USD ($)security	Dec. 31, 2016USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	$ 518,969	$ 863,072
Less Than 12 Months, Gross Unrealized Losses	(3,964)	(8,620)
12 Months or Longer, Fair Value	497,225	384,379
12 Months or Longer, Gross Unrealized Losses	(8,014)	(8,821)
Total Fair Value	1,016,194	1,247,451
Total Gross Unrealized Losses	(11,978)	(17,441)
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	1,645,070	1,855,387
Less Than 12 Months, Gross Unrealized Losses	(12,940)	(30,571)
12 Months or Longer, Fair Value	695,894	265,963
12 Months or Longer, Gross Unrealized Losses	(20,233)	(9,173)
Total Fair Value	2,340,964	2,121,350
Total Gross Unrealized Losses	$ (33,173)	(39,744)
Number of Investment Securities in an Unrealized Loss Position | security	306
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	$ 77,995	143,715
Less Than 12 Months, Gross Unrealized Losses	(420)	(562)
12 Months or Longer, Fair Value	152,914	89,211
12 Months or Longer, Gross Unrealized Losses	(533)	(732)
Total Fair Value	230,909	232,926
Total Gross Unrealized Losses	(953)	(1,294)
Debt Securities Issued by States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	11,064	211,188
Less Than 12 Months, Gross Unrealized Losses	(20)	(1,873)
12 Months or Longer, Fair Value	746	6,725
12 Months or Longer, Gross Unrealized Losses	(3)	(14)
Total Fair Value	11,810	217,913
Total Gross Unrealized Losses	(23)	(1,887)
Debt Securities Issued by Corporations
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	22,995	67,332
Less Than 12 Months, Gross Unrealized Losses	(8)	(714)
12 Months or Longer, Fair Value	202,713	196,838
12 Months or Longer, Gross Unrealized Losses	(2,297)	(3,156)
Total Fair Value	225,708	264,170
Total Gross Unrealized Losses	(2,305)	(3,870)
Residential - Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	17,046	38,355
Less Than 12 Months, Gross Unrealized Losses	(4)	(89)
12 Months or Longer, Fair Value	12,048	11,185
12 Months or Longer, Gross Unrealized Losses	(1,043)	(1,056)
Total Fair Value	29,094	49,540
Total Gross Unrealized Losses	(1,047)	(1,145)
Residential - U.S. Government-Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	389,869	397,385
Less Than 12 Months, Gross Unrealized Losses	(3,512)	(5,218)
12 Months or Longer, Fair Value	55,238	0
12 Months or Longer, Gross Unrealized Losses	(1,444)	0
Total Fair Value	445,107	397,385
Total Gross Unrealized Losses	(4,956)	(5,218)
Commercial - Government Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	0	5,097
Less Than 12 Months, Gross Unrealized Losses	0	(164)
12 Months or Longer, Fair Value	73,566	80,420
12 Months or Longer, Gross Unrealized Losses	(2,694)	(3,863)
Total Fair Value	73,566	85,517
Total Gross Unrealized Losses	(2,694)	(4,027)
Mortgage-Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	406,915	440,837
Less Than 12 Months, Gross Unrealized Losses	(3,516)	(5,471)
12 Months or Longer, Fair Value	140,852	91,605
12 Months or Longer, Gross Unrealized Losses	(5,181)	(4,919)
Total Fair Value	547,767	532,442
Total Gross Unrealized Losses	(8,697)	(10,390)
Debt Securities Issued by the U.S. Treasury and Government Agencies
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	159,956	169,926
Less Than 12 Months, Gross Unrealized Losses	(238)	(771)
12 Months or Longer, Fair Value	49,804	0
12 Months or Longer, Gross Unrealized Losses	(497)	0
Total Fair Value	209,760	169,926
Total Gross Unrealized Losses	(735)	(771)
Debt Securities Issued by Corporations
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	46,726	69,601
Less Than 12 Months, Gross Unrealized Losses	(716)	(971)
12 Months or Longer, Fair Value	14,589	15,933
12 Months or Longer, Gross Unrealized Losses	(440)	(557)
Total Fair Value	61,315	85,534
Total Gross Unrealized Losses	(1,156)	(1,528)
Residential - Government Agencies
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	897,044	835,227
Less Than 12 Months, Gross Unrealized Losses	(6,532)	(15,313)
12 Months or Longer, Fair Value	516,479	231,377
12 Months or Longer, Gross Unrealized Losses	(14,781)	(8,548)
Total Fair Value	1,413,523	1,066,604
Total Gross Unrealized Losses	(21,313)	(23,861)
Residential - U.S. Government-Sponsored Enterprises
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	508,545	693,047
Less Than 12 Months, Gross Unrealized Losses	(4,881)	(10,919)
12 Months or Longer, Fair Value	59,202	0
12 Months or Longer, Gross Unrealized Losses	(2,037)	0
Total Fair Value	567,747	693,047
Total Gross Unrealized Losses	(6,918)	(10,919)
Commercial - Government Agencies
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	32,799	87,586
Less Than 12 Months, Gross Unrealized Losses	(573)	(2,597)
12 Months or Longer, Fair Value	55,820	18,653
12 Months or Longer, Gross Unrealized Losses	(2,478)	(68)
Total Fair Value	88,619	106,239
Total Gross Unrealized Losses	(3,051)	(2,665)
Mortgage-Backed Securities
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months, Fair Value	1,438,388	1,615,860
Less Than 12 Months, Gross Unrealized Losses	(11,986)	(28,829)
12 Months or Longer, Fair Value	631,501	250,030
12 Months or Longer, Gross Unrealized Losses	(19,296)	(8,616)
Total Fair Value	2,069,889	1,865,890
Total Gross Unrealized Losses	$ (31,282)	$ (37,445)

(Interest Income - Taxable_Non-

(Interest Income - Taxable/Non-Taxable Invest. Sec.) (Details 5) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Interest Income from Investment Securities, Taxable	$ 27,441	$ 24,558	$ 79,949	$ 76,112
Interest Income from Investment Securities, Non-Taxable	4,880	5,070	14,915	15,410
Total Interest Income from Investment Securities	$ 32,321	$ 29,628	$ 94,864	$ 91,522

Investment Securities (Municipa

Investment Securities (Municipal Bonds Narrative) (Details 6) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
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]
Debt Securities Issued by State and Political Subdivision, State of Hawaii	$ 510.3
Municipal Debt Securities | Geographic Concentration Risk | HAWAII | Debt Securities Issued by States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Concentration Risk, Percentage	57.00%
Hawaiian Municipal Debt Securities | Investment Concentration Risk | HAWAII | General Obligation Bond
Schedule of Available-for-sale Securities [Line Items]
Concentration Risk, Percentage	78.00%
Moody's, Aa2 or Better Rating | Hawaiian Municipal Debt Securities | Investment Concentration Risk | HAWAII | Debt Securities Issued by States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Concentration Risk, Percentage	95.00%

(FHLB and FRB Stocks) (Details

(FHLB and FRB Stocks) (Details 7) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank Stock	$ 20,000	$ 20,000
Federal Reserve Bank Stock	20,645	20,063
Total	$ 40,645	$ 40,063

Investment Securities (Visa Cla

Investment Securities (Visa Class B Restricted Shares Narrative) (Details 8) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)shares	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)shares	Sep. 30, 2016USD ($)
Net Investment Income [Line Items]
Gain on Sale of Investment Securities | $	$ 0	$ 0	$ 12,467	$ 11,180
Visa Class B Restricted Securities
Net Investment Income [Line Items]
Conversion Ratio to Class A shares	1.6483		1.6483
Gain on Sale of Investment Securities | $	$ 12,500
Sale of investment securities, shares	90,000
Equity securities remaining, shares	90,914		90,914
Visa Class A Unrestricted Securities
Net Investment Income [Line Items]
Equity securities remaining, shares	149,854		149,854

Loans and Leases and the Allo45

Loans and Leases and the Allowance for Loan and Lease Losses (Loans and Leases Portfolio and Narrative) (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loan and lease portfolio
Loans and Leases	$ 9,573,956	$ 8,694,097	$ 9,573,956	$ 8,694,097	$ 8,949,785
Net Gains Related to Sales of Residential Mortgage Loans	1,400	3,600	4,600	9,800
Commercial
Loan and lease portfolio
Loans and Leases	3,739,963	3,489,554	3,739,963	3,489,554	3,617,692
Commercial | Commercial and Industrial
Loan and lease portfolio
Loans and Leases	1,252,238		1,252,238		1,249,791
Commercial | Commercial Mortgage
Loan and lease portfolio
Loans and Leases	2,050,998		2,050,998		1,889,551
Commercial | Construction
Loan and lease portfolio
Loans and Leases	232,487		232,487		270,018
Commercial | Lease Financing
Loan and lease portfolio
Loans and Leases	204,240		204,240		208,332
Consumer
Loan and lease portfolio
Loans and Leases	5,833,993	$ 5,204,543	5,833,993	$ 5,204,543	5,332,093
Consumer | Residential Mortgage
Loan and lease portfolio
Loans and Leases	3,366,634		3,366,634		3,163,073
Consumer | Home Equity
Loan and lease portfolio
Loans and Leases	1,528,353		1,528,353		1,334,163
Consumer | Automobile
Loan and lease portfolio
Loans and Leases	506,102		506,102		454,333
Consumer | Other
Loan and lease portfolio
Loans and Leases	$ 432,904		$ 432,904		$ 380,524

Loans and Leases and the Allo46

Loans and Leases and the Allowance for Loan and Lease Losses (Allowance for Loan and Lease Losses) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Allowance for Loan and Lease Losses:
Balance at Beginning of Period	$ 106,353	$ 103,932	$ 104,273	$ 102,880
Loans and Leases Charged-Off	(6,218)	(4,916)	(17,409)	(13,558)
Recoveries on Loans and Leases Previously Charged-Off	2,746	2,517	7,367	13,211
Net Loans and Leases Recovered (Charged-Off)	(3,472)	(2,399)	(10,042)	(347)
Provision for Credit Losses	4,000	2,500	12,650	1,500
Balance at End of Period	106,881	104,033	106,881	104,033
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment					$ 3,898		$ 3,447
Collectively Evaluated for Impairment					102,983		100,586
Total	106,353	103,932	104,273	102,880	106,881	$ 104,273	104,033
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment					61,123		60,243
Collectively Evaluated for Impairment					9,512,833		8,633,854
Total Loans and Leases					9,573,956	8,949,785	8,694,097
Commercial
Allowance for Loan and Lease Losses:
Balance at Beginning of Period	66,182	62,029	65,680	60,714
Loans and Leases Charged-Off	(611)	(209)	(909)	(670)
Recoveries on Loans and Leases Previously Charged-Off	598	296	1,200	7,619
Net Loans and Leases Recovered (Charged-Off)	(13)	87	291	6,949
Provision for Credit Losses	295	442	493	(5,105)
Balance at End of Period	66,464	62,558	66,464	62,558
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment					136		11
Collectively Evaluated for Impairment					66,328		62,547
Total	66,182	62,029	65,680	60,714	66,464	65,680	62,558
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment					21,738		21,793
Collectively Evaluated for Impairment					3,718,225		3,467,761
Total Loans and Leases					3,739,963	3,617,692	3,489,554
Consumer
Allowance for Loan and Lease Losses:
Balance at Beginning of Period	40,171	41,903	38,593	42,166
Loans and Leases Charged-Off	(5,607)	(4,707)	(16,500)	(12,888)
Recoveries on Loans and Leases Previously Charged-Off	2,148	2,221	6,167	5,592
Net Loans and Leases Recovered (Charged-Off)	(3,459)	(2,486)	(10,333)	(7,296)
Provision for Credit Losses	3,705	2,058	12,157	6,605
Balance at End of Period	40,417	41,475	40,417	41,475
Allowance for Loan and Lease Losses:
Individually Evaluated for Impairment					3,762		3,436
Collectively Evaluated for Impairment					36,655		38,039
Total	$ 40,171	$ 41,903	$ 38,593	$ 42,166	40,417	38,593	41,475
Recorded Investment in Loans and Leases:
Individually Evaluated for Impairment					39,385		38,450
Collectively Evaluated for Impairment					5,794,608		5,166,093
Total Loans and Leases					$ 5,833,993	$ 5,332,093	$ 5,204,543

Loans and Leases and the Allo47

Loans and Leases and the Allowance for Loan and Lease Losses (Credit Quality Indicators & Narrative) (Details 3) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	$ 9,573,956	$ 8,949,785	$ 8,694,097
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
Residential Mortgage | Classified
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%
Home Equity | Classified
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%
Commercial
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	$ 3,739,963	3,617,692	3,489,554
Commercial | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	3,638,656	3,466,817
Commercial | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	49,350	91,210
Commercial | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	51,957	59,665
Commercial | Commercial and Industrial
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,252,238	1,249,791
Commercial | Commercial and Industrial | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,206,294	1,203,025
Commercial | Commercial and Industrial | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	18,593	20,253
Commercial | Commercial and Industrial | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	27,351	26,513
Commercial | Commercial Mortgage
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	2,050,998	1,889,551
Commercial | Commercial Mortgage | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,997,523	1,792,119
Commercial | Commercial Mortgage | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	30,744	66,734
Commercial | Commercial Mortgage | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	22,731	30,698
Commercial | Construction
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	232,487	270,018
Commercial | Construction | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	231,033	264,287
Commercial | Construction | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	13	4,218
Commercial | Construction | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,441	1,513
Commercial | Lease Financing
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	204,240	208,332
Commercial | Lease Financing | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	203,806	207,386
Commercial | Lease Financing | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	0	5
Commercial | Lease Financing | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	434	941
Consumer
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	5,833,993	5,332,093	$ 5,204,543
Consumer | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	5,816,873	5,310,202
Consumer | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	$ 1,764	2,964
Consumer | Classified
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	$ 15,356	18,927
Consumer | Residential Mortgage
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	3,366,634	3,163,073
Consumer | Residential Mortgage | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	3,357,447	3,149,294
Consumer | Residential Mortgage | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	0	0
Consumer | Residential Mortgage | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	9,187	13,779
Consumer | Home Equity
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,528,353	1,334,163
Consumer | Home Equity | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,521,919	1,327,676
Consumer | Home Equity | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	1,764	2,964
Consumer | Home Equity | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	4,670	3,523
Consumer | Automobile
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	506,102	454,333
Consumer | Automobile | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	505,296	453,439
Consumer | Automobile | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	0	0
Consumer | Automobile | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	806	894
Consumer | Other
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	432,904	380,524
Consumer | Other | Pass
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	432,211	379,793
Consumer | Other | Special Mention
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	0	0
Consumer | Other | Classified
Recorded Investment in Loans and Leases by Class and by Credit Quality Indicator
Total Recorded Investment in Loans and Leases	$ 693	$ 731

Loans and Leases and the Allo48

Loans and Leases and the Allowance for Loan and Lease Losses (Aging Analysis) (Details 4) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	$ 15,642	$ 18,075
Total Past Due and Non-Accrual	51,464	67,494
Current	9,522,492	8,882,291
Total Loans and Leases	9,573,956	8,949,785	$ 8,694,097
Non-Accrual Loans and Leases that are Current	$ 3,383	3,059
Number of days non-accrual loans are not past due	30 days
30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 22,325	35,272
60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,833	7,077
Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,664	7,070
Commercial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	2,326	1,148
Total Past Due and Non-Accrual	6,540	13,007
Current	3,733,423	3,604,685
Total Loans and Leases	3,739,963	3,617,692	3,489,554
Non-Accrual Loans and Leases that are Current	566	416
Commercial | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	3,384	10,826
Commercial | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	825	1,033
Commercial | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5	0
Commercial | Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	901	151
Total Past Due and Non-Accrual	3,175	11,865
Current	1,249,063	1,237,926
Total Loans and Leases	1,252,238	1,249,791
Non-Accrual Loans and Leases that are Current	162	0
Commercial | Commercial and Industrial | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,063	10,698
Commercial | Commercial and Industrial | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	206	1,016
Commercial | Commercial and Industrial | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	5	0
Commercial | Commercial Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	1,425	997
Total Past Due and Non-Accrual	3,365	1,142
Current	2,047,633	1,888,409
Total Loans and Leases	2,050,998	1,889,551
Non-Accrual Loans and Leases that are Current	404	416
Commercial | Commercial Mortgage | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,321	128
Commercial | Commercial Mortgage | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	619	17
Commercial | Commercial Mortgage | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	232,487	270,018
Total Loans and Leases	232,487	270,018
Non-Accrual Loans and Leases that are Current	0	0
Commercial | Construction | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Construction | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Construction | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Lease Financing
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	0	0
Current	204,240	208,332
Total Loans and Leases	204,240	208,332
Non-Accrual Loans and Leases that are Current	0	0
Commercial | Lease Financing | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Lease Financing | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Commercial | Lease Financing | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	0	0
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	13,316	16,927
Total Past Due and Non-Accrual	44,924	54,487
Current	5,789,069	5,277,606
Total Loans and Leases	5,833,993	5,332,093	$ 5,204,543
Non-Accrual Loans and Leases that are Current	2,817	2,643
Consumer | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	18,941	24,446
Consumer | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,008	6,044
Consumer | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	6,659	7,070
Consumer | Residential Mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	9,188	13,780
Total Past Due and Non-Accrual	17,415	23,504
Current	3,349,219	3,139,569
Total Loans and Leases	3,366,634	3,163,073
Non-Accrual Loans and Leases that are Current	1,517	1,628
Consumer | Residential Mortgage | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	3,838	6,491
Consumer | Residential Mortgage | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,456	106
Consumer | Residential Mortgage | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,933	3,127
Consumer | Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	4,128	3,147
Total Past Due and Non-Accrual	9,125	9,911
Current	1,519,228	1,324,252
Total Loans and Leases	1,528,353	1,334,163
Non-Accrual Loans and Leases that are Current	1,300	1,015
Consumer | Home Equity | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,588	3,063
Consumer | Home Equity | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,017	2,244
Consumer | Home Equity | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,392	1,457
Consumer | Automobile
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	12,172	14,748
Current	493,930	439,585
Total Loans and Leases	506,102	454,333
Non-Accrual Loans and Leases that are Current	0	0
Consumer | Automobile | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	9,743	11,692
Consumer | Automobile | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,623	2,162
Consumer | Automobile | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	806	894
Consumer | Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Non-Accrual	0	0
Total Past Due and Non-Accrual	6,212	6,324
Current	426,692	374,200
Total Loans and Leases	432,904	380,524
Non-Accrual Loans and Leases that are Current	0	0
Consumer | Other | 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	2,772	3,200
Consumer | Other | 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	1,912	1,532
Consumer | Other | Past Due 90 Days or More
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Days Past Due	$ 1,528	$ 1,592

Loans and Leases and the Allo49

Loans and Leases and the Allowance for Loan and Lease Losses (Impaired Loans) (Details 5) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 19,858		$ 19,858		$ 20,442
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	30,669		30,669		30,904
Impaired Financing Receivable, with Related Allowance, Recorded Investment	41,265		41,265		40,256
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	46,004		46,004		45,246
Related Allowance for Loan Losses	3,898		3,898		3,555
Recorded Investment	61,123		61,123		60,698
Unpaid Principal Balance	76,673		76,673		76,150
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	19,557	$ 21,158	19,856	$ 22,671
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized, Accrual Method	190	230	542	661
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	40,368	39,447	40,364	39,809
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	540	455	1,505	1,352
Impaired Loans Average Recorded Investment	59,925	60,605	60,220	62,480
Impaired Loans Interest Income Recognized	730	685	2,047	2,013
Commercial
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	19,858		19,858		20,442
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	30,669		30,669		30,904
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,880		1,880		1,130
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,880		1,880		1,130
Related Allowance for Loan Losses	136		136		45
Recorded Investment	21,738		21,738		21,572
Unpaid Principal Balance	32,549		32,549		32,034
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	19,557	21,158	19,856	22,671
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized, Accrual Method	190	230	542	661
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,411	875	1,246	1,080
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	42	32	70	64
Impaired Loans Average Recorded Investment	20,968	22,033	21,102	23,751
Impaired Loans Interest Income Recognized	232	262	612	725
Commercial | Commercial and Industrial
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,967		8,967		9,556
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	16,279		16,279		16,518
Impaired Financing Receivable, with Related Allowance, Recorded Investment	656		656		765
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	656		656		765
Related Allowance for Loan Losses	14		14		24
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	8,592	9,762	8,989	11,061
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized, Accrual Method	106	115	248	333
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	640	681	684	983
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	11	27	31	59
Commercial | Commercial Mortgage
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,450		9,450		9,373
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,950		12,950		12,873
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,224		1,224		365
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,224		1,224		365
Related Allowance for Loan Losses	122		122		21
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,512	9,848	9,390	10,040
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized, Accrual Method	61	90	223	252
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	771	194	562	97
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	31	5	39	5
Commercial | Construction
Impaired Loans Information:
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,441		1,441		1,513
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,440		1,440		1,513
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,453	1,548	1,477	1,570
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized, Accrual Method	23	25	71	76
Consumer
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	39,385		39,385		39,126
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	44,124		44,124		44,116
Related Allowance for Loan Losses	3,762		3,762		3,510
Recorded Investment	39,385		39,385		39,126
Unpaid Principal Balance	44,124		44,124		44,116
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	38,957	38,572	39,118	38,729
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	498	423	1,435	1,288
Impaired Loans Average Recorded Investment	38,957	38,572	39,118	38,729
Impaired Loans Interest Income Recognized	498	423	1,435	1,288
Consumer | Residential Mortgage
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	21,401		21,401		25,625
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	26,140		26,140		30,615
Related Allowance for Loan Losses	3,117		3,117		3,224
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	21,674	27,172	23,331	27,889
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	209	235	635	736
Consumer | Home Equity
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,810		1,810		1,516
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,810		1,810		1,516
Related Allowance for Loan Losses	267		267		15
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,773	1,428	1,642	1,365
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	20	15	57	50
Consumer | Automobile
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	13,612		13,612		9,660
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	13,612		13,612		9,660
Related Allowance for Loan Losses	304		304		206
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,895	7,908	11,592	7,553
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	217	129	581	376
Consumer | Other
Impaired Loans Information:
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,562		2,562		2,325
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,562		2,562		2,325
Related Allowance for Loan Losses	74		74		$ 65
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,615	2,064	2,553	1,922
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized, Accrual Method	$ 52	$ 44	$ 162	$ 126

Loans and Leases and the Allo50

Loans and Leases and the Allowance for Loan and Lease Losses (Troubled Debt Restructuring & Narrative) (Details 6) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract	Dec. 31, 2016USD ($)
Information related to loans modified as a TDR
Recorded Investment	$ 59,200		$ 59,200		$ 60,000
Available Commitments to Lend Additional Funds on Loans Modified as TDR			$ 0		$ 400
Number of Contracts | contract	162	149	480	355
Recorded Investment (as of period end)	$ 4,727	$ 3,040	$ 17,722	$ 11,537
Increase in Allowance (as of period end)	$ 162	$ 313	$ 287	$ 395
Residential Mortgage | Maximum
Information related to loans modified as a TDR
Period of Time Loan Being Fully Amortized			40 years
Land Loan | Maximum
Information related to loans modified as a TDR
Period of Time Loan Being Fully Amortized			360 months
Extending Balloon Payments			5 years
Commercial
Information related to loans modified as a TDR
Number of Contracts | contract	3	5	15	7
Recorded Investment (as of period end)	$ 1,505	$ 305	$ 9,492	$ 3,292
Increase in Allowance (as of period end)	$ 93	$ 3	$ 105	$ 3
Commercial | Commercial and Industrial
Information related to loans modified as a TDR
Number of Contracts | contract	1	4	12	6
Recorded Investment (as of period end)	$ 198	$ 97	$ 7,485	$ 3,084
Increase in Allowance (as of period end)	$ 0	$ 1	$ 12	$ 1
Commercial | Commercial Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	2	1	3	1
Recorded Investment (as of period end)	$ 1,307	$ 208	$ 2,007	$ 208
Increase in Allowance (as of period end)	$ 93	$ 2	$ 93	$ 2
Consumer
Information related to loans modified as a TDR
Number of Contracts | contract	159	144	465	348
Recorded Investment (as of period end)	$ 3,222	$ 2,735	$ 8,230	$ 8,245
Increase in Allowance (as of period end)	$ 69	$ 310	$ 182	$ 392
Consumer | Residential Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	0	3	0	8
Recorded Investment (as of period end)	$ 0	$ 547	$ 0	$ 3,025
Increase in Allowance (as of period end)	$ 0	$ 258	$ 0	$ 274
Consumer | Home Equity
Information related to loans modified as a TDR
Number of Contracts | contract	2	0	3	1
Recorded Investment (as of period end)	$ 203	$ 0	$ 442	$ 476
Increase in Allowance (as of period end)	$ 1	$ 0	$ 5	$ 5
Consumer | Automobile
Information related to loans modified as a TDR
Number of Contracts | contract	123	79	326	184
Recorded Investment (as of period end)	$ 2,636	$ 1,678	$ 6,657	$ 3,617
Increase in Allowance (as of period end)	$ 59	$ 38	$ 149	$ 82
Consumer | Other
Information related to loans modified as a TDR
Number of Contracts | contract	34	62	136	155
Recorded Investment (as of period end)	$ 383	$ 510	$ 1,131	$ 1,127
Increase in Allowance (as of period end)	$ 9	$ 14	$ 28	$ 31

Loans and Leases and the Allo51

Loans and Leases and the Allowance for Loan and Lease Losses (Troubled Debt Restructuring's that Defaulted During the Period) (Details 7) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2016USD ($)contract
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract	28	1	57	25
Recorded Investment (as of period ended), TDRs that Defaulted | $	$ 456	$ 3	$ 784	$ 1,359
Minimum
Information related to loans modified as a TDR
Default Period Past Due Following Modification of Loans in TDR (in days)			60 days
Commercial
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract			1	0
Recorded Investment (as of period ended), TDRs that Defaulted | $			$ 49	$ 0
Commercial | Commercial and Industrial
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract			1	0
Recorded Investment (as of period ended), TDRs that Defaulted | $			$ 49	$ 0
Consumer
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract	28	1	56	25
Recorded Investment (as of period ended), TDRs that Defaulted | $	$ 456	$ 3	$ 735	$ 1,359
Consumer | Residential Mortgage
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract			0	3
Recorded Investment (as of period ended), TDRs that Defaulted | $			$ 0	$ 1,044
Consumer | Home Equity
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract			0	1
Recorded Investment (as of period ended), TDRs that Defaulted | $			$ 0	$ 158
Consumer | Automobile
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract	15	1	23	3
Recorded Investment (as of period ended), TDRs that Defaulted | $	$ 373	$ 3	$ 551	$ 47
Consumer | Other
Information related to loans modified as a TDR
Number of Contracts, TDRs that Defaulted | contract	13	0	33	18
Recorded Investment (as of period ended), TDRs that Defaulted | $	$ 83	$ 0	$ 184	$ 110

Loans and Leases and the Allo52

Loans and Leases and the Allowance for Loan and Lease Losses (Foreclosure Proceedings Narrative) (Details 8) $ in Millions	Sep. 30, 2017USD ($)
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	$ 5.5

Mortgage Servicing Rights (Narr

Mortgage Servicing Rights (Narrative) (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract]
Residential mortgage loans serviced for third parties	$ 2,900		$ 2,900		$ 2,700
Servicing income, including late and ancillary fees	$ 1.8	$ 1.7	$ 5.3	$ 5.2

Mortgage Servicing Rights (Fair

Mortgage Servicing Rights (Fair value method rollforward) (Details 2) - Mortgage Servicing Rights - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Mortgage servicing rights accounted for under the fair value measurement method [Rollforward]
Balance at Beginning of Period	$ 1,548	$ 1,819	$ 1,655	$ 1,970
Due to Payoffs	(39)	(79)	(146)	(230)
Total Changes in Fair Value of Mortgage Servicing Rights	(39)	(79)	(146)	(230)
Balance at End of Period	$ 1,509	$ 1,740	$ 1,509	$ 1,740

Mortgage Servicing Rights (Amor

Mortgage Servicing Rights (Amortization method rollforward) (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Valuation Allowance for Impairment of Mortgage Servicing Rights Accounted for under the Amortization Method [Roll Forward]
Balance at End of Period	$ (210)		$ (210)
Mortgage Servicing Rights
Mortgage Servicing Rights Accounted for Under the Amortization Method {Rollforward)
Balance at Beginning of Period	22,923	$ 17,812	22,008	$ 21,032
Servicing Rights that Resulted From Asset Transfers	900	1,670	3,176	2,441
Amortization	(739)	(780)	(2,047)	(2,093)
Valuation Allowance Provision	(157)	549	(210)	(2,129)
Balance at End of Period	22,927	19,251	22,927	19,251
Valuation Allowance for Impairment of Mortgage Servicing Rights Accounted for under the Amortization Method [Roll Forward]
Balance at Beginning of Period	(53)	(2,699)	0	(21)
Valuation Allowance Provision	(157)	549	(210)	(2,129)
Balance at End of Period	(210)	(2,150)	(210)	(2,150)
Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method
Beginning of Period	25,479	17,812	25,148	24,804
End of Period	$ 23,761	$ 19,177	$ 23,761	$ 19,177

Mortgage Servicing Rights (Key

Mortgage Servicing Rights (Key assumptions) (Details 4) - Mortgage Servicing Rights	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Key data and assumptions used in estimating the fair value of mortgage servicing rights
Weighted-Average Constant Prepayment Rate (as a percent)	9.21%	8.13%
Weighted-Average Life (in years)	6 years 10 months 17 days	7 years 5 months 4 days
Weighted-Average Note Rate (as a percent)	4.06%	4.10%
Weighted-Average Discount Rate (as a percent)	8.89%	9.33%

Mortgage Servicing Rights (Sens

Mortgage Servicing Rights (Sensitivity analysis) (Details 5) - Mortgage Servicing Rights - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Constant Prepayment Rate
Decrease in fair value from 25 basis points (“bps”) adverse change	$ (284)	$ (321)
Decrease in fair value from 50 bps adverse change	(563)	(636)
Discount Rate
Decrease in fair value from 25 bps adverse change	(255)	(288)
Decrease in fair value from 50 bps adverse change	$ (504)	$ (570)

Low Income Housing Tax Credit58

Low Income Housing Tax Credit Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Affordable Housing Tax Credit Investments, Unfunded Commitment [Abstract]
2,017	$ 8,760		$ 8,760
2,018	14,164		14,164
2,019	2,382		2,382
2,020	51		51
2,021	37		37
Thereafter	1,065		1,065
Total Unfunded Commitments	26,459		26,459
Effective Yield Method
Tax credits and other tax benefits recognized	3,414	$ 3,352	10,282	$ 10,384
Amortization Expense in Provision for Income Taxes	2,105	1,319	6,403	5,667
Proportional Amortization Method
Tax credits and other tax benefits recognized	440	259	1,201	777
Amortization Expense in Provision for Income Taxes	358	$ 200	969	600
Net affordable housing tax credit investments and related unfunded commitments	$ 73,500		73,500		$ 66,600
Write down from impairment of LIHTC Investments			$ 0	$ 0

Balance Sheet Offsetting (Repos

Balance Sheet Offsetting (Repos - by maturity date and collateral type) (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	$ 505,293	$ 523,378
Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	312,885	304,681
Debt Securities Issued by States and Political Subdivisions
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	4,498	22,640
Mortgage-Backed Securities: Residential - Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	99,048	98,019
Mortgage-Backed Securities: Residential - U.S. Government-Sponsored Enterprises
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	88,862	98,038
Maturity Up To 90 Days [Member]
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	1,993	22,788
Maturity Up To 90 Days [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity Up To 90 Days [Member] | Debt Securities Issued by States and Political Subdivisions
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	1,198	22,050
Maturity Up To 90 Days [Member] | Mortgage-Backed Securities: Residential - Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	795	738
Maturity Up To 90 Days [Member] | Mortgage-Backed Securities: Residential - U.S. Government-Sponsored Enterprises
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity 91 To 365 Days [Member]
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	3,300	590
Maturity 91 To 365 Days [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity 91 To 365 Days [Member] | Debt Securities Issued by States and Political Subdivisions
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	3,300	590
Maturity 91 To 365 Days [Member] | Mortgage-Backed Securities: Residential - Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity 91 To 365 Days [Member] | Mortgage-Backed Securities: Residential - U.S. Government-Sponsored Enterprises
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity 1 To 3 Years [Member]
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	75,000	200,000
Maturity 1 To 3 Years [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	69,717	200,000
Maturity 1 To 3 Years [Member] | Debt Securities Issued by States and Political Subdivisions
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity 1 To 3 Years [Member] | Mortgage-Backed Securities: Residential - Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity 1 To 3 Years [Member] | Mortgage-Backed Securities: Residential - U.S. Government-Sponsored Enterprises
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	5,283	0
Maturity After 3 Years [Member]
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	425,000	300,000
Maturity After 3 Years [Member] | Debt Securities Issued by the U.S. Treasury and Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	243,168	104,681
Maturity After 3 Years [Member] | Debt Securities Issued by States and Political Subdivisions
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	0	0
Maturity After 3 Years [Member] | Mortgage-Backed Securities: Residential - Government Agencies
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	98,253	97,281
Maturity After 3 Years [Member] | Mortgage-Backed Securities: Residential - U.S. Government-Sponsored Enterprises
Securities Sold Under Agreements to Repurchase
Securities Sold under Agreements to Repurchase	$ 83,579	$ 98,038

Balance Sheet Offsetting (Asset

Balance Sheet Offsetting (Assets and liabilities subject to MNA, or repurchase agreements) (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	$ 505,293	$ 523,378
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	505,293	523,378
Repurchase Agreements, Fair Value of Collateral Pledged	505,293	523,378
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	4,800	5,500
Institutional Counterparties | Interest Rate Swap Agreements
Offsetting Assets and Liabilities [Line items]
Derivative Liability, Fair Value of Collateral	6,000
Assets:
Gross Amounts of Recognized Assets	4,168	5,094
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	4,168	5,094
Netting Adjustments per Master Netting Arrangements	4,168	5,094
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	5,998	6,489
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	5,998	6,489
Derivative Liability, Netting Adjustments per Master Netting Arrangements	4,168	5,094
Derivative, Collateral, Right to Reclaim Securities	1,830	500
Derivative Liabilities, Net Amount	0	895
Private Institutions
Offsetting Assets and Liabilities [Line items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	567,300	599,300
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	500,000	500,000
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	500,000	500,000
Repurchase Agreements, Fair Value of Collateral Pledged	500,000	500,000
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	0	0
Government Entities
Offsetting Assets and Liabilities [Line items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	7,000	28,900
Liabilities:
Repurchase Agreements, Gross Amounts of Recognized Liabilities	5,293	23,378
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	5,293	23,378
Repurchase Agreements, Fair Value of Collateral Pledged	5,293	23,378
Securities Sold under Agreements to Repurchase, Net Amount Offset Against Collateral	$ 0	$ 0

Accumulated Other Comprehensi61

Accumulated Other Comprehensive Income (Loss) (AOCI Components Pre Post & Tax Effect) (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income (Loss), Before Tax:
Net Unrealized Gains (Losses) Arising During the Period	$ 236	$ (9,420)	$ 12,458	$ 12,804
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	497	286	1,492	949
Net Unrealized Gains (Losses) on Investment Securities	733	(9,134)	13,950	13,753
Amortization of Net Actuarial Losses (Gains)	322	314	967	940
Amortization of Prior Service Credit	(81)	(81)	(242)	(242)
Defined Benefit Plans, Net	241	233	725	698
Other Comprehensive Income (Loss)	974	(8,901)	14,675	14,451
Other Comprehensive Income (Loss), Tax Effect:
Net Unrealized Gains (Losses) Arising During the Period	93	(3,719)	4,917	5,055
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	196	113	589	375
Net Unrealized Gains (Losses) on Investment Securities	289	(3,606)	5,506	5,430
Amortization of Net Actuarial Losses (Gains)	127	124	382	371
Amortization of Prior Service Credit	(32)	(31)	(96)	(95)
Defined Benefit Plans, Net	95	93	286	276
Other Comprehensive Income (Loss)	384	(3,513)	5,792	5,706
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) Arising During the Period	143	(5,701)	7,541	7,749
Amortization of Unrealized Holding (Gains) Losses on HTM Securities	301	173	903	574
Net Unrealized Gains (Losses) on Investment Securities	444	(5,528)	8,444	8,323
Amortization of Net Actuarial Losses (Gains)	195	190	585	569
Amortization of Prior Service Credit	(49)	(50)	(146)	(147)
Defined Benefit Plans, Net	146	140	439	422
Total Other Comprehensive Income (Loss)	$ 590	$ (5,388)	$ 8,883	$ 8,745

Accumulated Other Comprehensi62

Accumulated Other Comprehensive Income (Loss) (Change in AOCI Components net of tax) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period			$ 1,161,537	$ 1,116,260
Total Other Comprehensive Income (Loss)	$ 590	$ (5,388)	8,883	8,745
Balance at End of Period	1,227,893	1,163,859	1,227,893	1,163,859
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(28,599)	(28,579)	(28,892)	(28,861)
Other Comprehensive Income (Loss) Before Reclassifications	0	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	146	140	439	422
Total Other Comprehensive Income (Loss)	146	140	439	422
Balance at End of Period	(28,453)	(28,439)	(28,453)	(28,439)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(25,613)	(9,424)	(33,906)	(23,557)
Other Comprehensive Income (Loss) Before Reclassifications	143	(5,701)	7,541	7,749
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	447	313	1,342	996
Total Other Comprehensive Income (Loss)	590	(5,388)	8,883	8,745
Balance at End of Period	(25,023)	(14,812)	(25,023)	(14,812)
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	8,668	26,009	1,270	12,559
Other Comprehensive Income (Loss) Before Reclassifications	143	(5,701)	7,541	7,749
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	0	0
Total Other Comprehensive Income (Loss)	143	(5,701)	7,541	7,749
Balance at End of Period	8,811	20,308	8,811	20,308
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	(5,682)	(6,854)	(6,284)	(7,255)
Other Comprehensive Income (Loss) Before Reclassifications	0	0	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	301	173	903	574
Total Other Comprehensive Income (Loss)	301	173	903	574
Balance at End of Period	$ (5,381)	$ (6,681)	$ (5,381)	$ (6,681)

Accumulated Other Comprehensi63

Accumulated Other Comprehensive Income (Loss) (AOCI Reclass to IS) (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	$ (51,626)	$ (49,725)	$ (153,341)	$ (150,528)
Tax Benefit (Expense)	(20,248)	(18,501)	(62,306)	(60,889)
Net Income	45,881	43,493	141,719	137,948
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Income	(447)	(313)	(1,342)	(996)
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	(497)	(286)	(1,492)	(949)
Tax Benefit (Expense)	196	113	589	375
Net Income	(301)	(173)	(903)	(574)
Amortization of Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	(241)	(233)	(725)	(698)
Tax Benefit (Expense)	95	93	286	276
Net Income	(146)	(140)	(439)	(422)
Prior Service Credit | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	81	81	242	242
Net Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Salaries and Benefits	$ (322)	$ (314)	$ (967)	$ (940)

Earnings Per Share (Details)

Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of Diluted Shares
Denominator for Basic Earnings Per Share (in shares)	42,251,541	42,543,122	42,336,441	42,730,571
Dilutive Effect of Equity Based Awards (in shares)	313,823	235,224	325,722	216,488
Denominator for Diluted Earnings Per Share (in shares)	42,565,364	42,778,346	42,662,163	42,947,059
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	1,070	0	363	0

Business Segments (Business Seg

Business Segments (Business Segments Financial Information and Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)atmbranch	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Business segment financial information
Federal and State effective tax rate used for segment reporting			37.00%
Net Interest Income	$ 116,317	$ 103,912	$ 338,468	$ 310,486
Provision for Credit Losses	4,000	2,500	12,650	1,500
Net Interest Income After Provision for Credit Losses	112,317	101,412	325,818	308,986
Noninterest Income	42,410	48,114	143,562	150,840
Noninterest Expense	(88,598)	(87,532)	(265,355)	(260,989)
Income Before Provision for Income Taxes	66,129	61,994	204,025	198,837
Provision for Income Taxes	(20,248)	(18,501)	(62,306)	(60,889)
Net Income	45,881	43,493	141,719	137,948
Total Assets	17,268,302	16,014,643	$ 17,268,302	16,014,643	$ 16,492,367
Retail Banking
Business segment financial information
Number of branch locations through which products and services are delivered to customers | branch			69
Number of ATM's through which products and services are delivered to customers | atm			388
Net Interest Income	67,128	61,747	$ 198,633	179,798
Provision for Credit Losses	3,512	2,574	10,413	7,415
Net Interest Income After Provision for Credit Losses	63,616	59,173	188,220	172,383
Noninterest Income	21,287	24,786	64,132	67,364
Noninterest Expense	(51,507)	(51,892)	(155,786)	(155,391)
Income Before Provision for Income Taxes	33,396	32,067	96,566	84,356
Provision for Income Taxes	(11,908)	(11,329)	(34,323)	(29,958)
Net Income	21,488	20,738	62,243	54,398
Total Assets	5,758,799	5,206,442	5,758,799	5,206,442
Commercial Banking
Business segment financial information
Net Interest Income	43,438	38,613	127,106	115,112
Provision for Credit Losses	(35)	(168)	(355)	(7,052)
Net Interest Income After Provision for Credit Losses	43,473	38,781	127,461	122,164
Noninterest Income	5,137	6,977	16,451	21,015
Noninterest Expense	(17,721)	(17,449)	(54,483)	(52,479)
Income Before Provision for Income Taxes	30,889	28,309	89,429	90,700
Provision for Income Taxes	(10,891)	(10,073)	(31,472)	(32,337)
Net Income	19,998	18,236	57,957	58,363
Total Assets	3,695,606	3,428,424	3,695,606	3,428,424
Investment Services and Private Banking
Business segment financial information
Net Interest Income	7,321	6,029	20,685	18,518
Provision for Credit Losses	(5)	(7)	(16)	(18)
Net Interest Income After Provision for Credit Losses	7,326	6,036	20,701	18,536
Noninterest Income	13,593	13,662	43,389	43,632
Noninterest Expense	(14,925)	(14,579)	(45,692)	(44,786)
Income Before Provision for Income Taxes	5,994	5,119	18,398	17,382
Provision for Income Taxes	(2,218)	(1,894)	(6,807)	(6,431)
Net Income	3,776	3,225	11,591	10,951
Total Assets	305,015	290,207	305,015	290,207
Treasury and Other
Business segment financial information
Net Interest Income	(1,570)	(2,477)	(7,956)	(2,942)
Provision for Credit Losses	528	101	2,608	1,155
Net Interest Income After Provision for Credit Losses	(2,098)	(2,578)	(10,564)	(4,097)
Noninterest Income	2,393	2,689	19,590	18,829
Noninterest Expense	(4,445)	(3,612)	(9,394)	(8,333)
Income Before Provision for Income Taxes	(4,150)	(3,501)	(368)	6,399
Provision for Income Taxes	4,769	4,795	10,296	7,837
Net Income	619	1,294	9,928	14,236
Total Assets	$ 7,508,882	$ 7,089,570	$ 7,508,882	$ 7,089,570

Pension Plans and Postretirem66

Pension Plans and Postretirement Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Benefits
Net periodic benefit cost for pension plans and the postretirement benefit plan
Service Cost	$ 0	$ 0	$ 0	$ 0
Interest Cost	1,161	1,210	3,483	3,628
Expected Return on Plan Assets	(1,238)	(1,282)	(3,714)	(3,844)
Amortization of Prior Service Credit	0	0	0	0
Amortization of Net Actuarial Losses (Gains)	433	389	1,298	1,166
Net Periodic Benefit Cost	356	317	1,067	950
Employer Contributions	10,200		10,400
Estimated Future Employer Contributions in Current Fiscal Year			10,500
Postretirement Benefits
Net periodic benefit cost for pension plans and the postretirement benefit plan
Service Cost	123	137	369	411
Interest Cost	272	294	816	882
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Credit	(81)	(81)	(242)	(242)
Amortization of Net Actuarial Losses (Gains)	(111)	(75)	(331)	(226)
Net Periodic Benefit Cost	203	$ 275	612	$ 825
Employer Contributions	$ 200		700
Estimated Future Employer Contributions in Current Fiscal Year			$ 1,000

Derivative Financial Instrume67

Derivative Financial Instruments (Notional Amounts) (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Interest Rate Lock Commitments
Derivative [Line Items]
Notional Amount	$ 50,050	$ 55,223
Fair Value	958	1,067
Forward Commitments
Derivative [Line Items]
Notional Amount	51,263	104,962
Fair Value	19	847
Receive Fixed / Pay Variable Swap
Derivative [Line Items]
Notional Amount	378,618	357,441
Fair Value	2,187	1,381
Pay Fixed / Receive Variable Swap
Derivative [Line Items]
Notional Amount	378,618	357,441
Fair Value	(1,830)	(1,395)
Foreign Exchange Contracts
Derivative [Line Items]
Notional Amount	56,130	38,172
Fair Value	$ (677)	$ (757)

Derivative Financial Instrume68

Derivative Financial Instruments (Assets and liabilities) (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	$ 11,586	$ 13,731
Liability Derivatives	10,929	12,588
Interest Rate Lock Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	962	1,236
Liability Derivatives	4	169
Forward Commitments
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	76	873
Liability Derivatives	57	26
Interest Rate Swap Agreements
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	10,522	11,569
Liability Derivatives	10,165	11,583
Foreign Exchange Contracts
Derivative Financial Instruments Not Designated as Hedging Instruments
Asset Derivatives	26	53
Liability Derivatives	$ 703	$ 810

Derivative Financial Instrume69

Derivative Financial Instruments (Net gains or losses) (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in the statements of income	$ 1,880	$ 5,587	$ 6,440	$ 10,344
Interest Rate Lock Commitments | Mortgage Banking Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in the statements of income	1,550	4,154	4,472	8,113
Forward Commitments | Mortgage Banking Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in the statements of income	(434)	(934)	(1,322)	(2,430)
Interest Rate Swap Agreements | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in the statements of income	10	1,595	690	2,416
Foreign Exchange Contracts | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recognized in the statements of income	$ 754	$ 772	$ 2,600	$ 2,245

Derivative Financial Instrume70

Derivative Financial Instruments (Narrative) (Details 4) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Reduction of swap liabilities caused by variation margin payments	$ 400
Liability Derivatives	10,929	$ 12,588
Visa Conversion Rate Swap Agreement
Derivative [Line Items]
Liability Derivatives	$ 0

Commitments, Contingencies, a71

Commitments, Contingencies, and Guarantees (Credit Commitments) (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Credit Commitments [Line Items]
Credit Commitments	$ 2,934,269	$ 2,861,833
Unfunded Commitments to Extend Credit
Credit Commitments [Line Items]
Credit Commitments	2,793,531	2,732,734
Standby Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	122,137	112,830
Commercial Letters of Credit
Credit Commitments [Line Items]
Credit Commitments	$ 18,601	$ 16,269

Commitments, Contingencies, a72

Commitments, Contingencies, and Guarantees (Narrative) (Details 2) - Residential Mortgage $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)Loan
Representations and Warranties [Line Items]
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding | $	$ 2,700
Number of Mortgage Loans Repurchased	1
Unpaid principal balance of repurchased mortgage loans | $	$ 0.2
Number of Mortgage Loans Repurchased, Pending	0
Number of Mortgage Loans Repurchased due to Loan Servicing Activities	0
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 Liab73

Fair Value of Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Liability Derivatives	$ 10,929	$ 12,588
Visa Conversion Rate Swap Agreement
Derivative [Line Items]
Liability Derivatives	$ 0

Fair Value of Assets and Liab74

Fair Value of Assets and Liabilities (Fair value on recurring basis) (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Available-for-Sale: Fair Value	$ 2,322,668	$ 2,186,041
Loans Held for Sale	9,752	62,499
Fair Value, Measurements, Recurring
Assets:
Available-for-Sale: Fair Value	2,322,668	2,186,041
Loans Held for Sale	9,752	62,499
Mortgage Servicing Rights	1,509	1,655
Other Assets	28,064	21,952
Derivatives	11,586	13,731
Total Assets Measured at Fair Value on a Recurring Basis	2,373,579	2,285,878
Liabilites:
Derivatives	10,929	12,588
Total Liabilities Measured at Fair Value on a Recurring Basis	10,929	12,588
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale: Fair Value	449,204	408,715
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	641,963	671,799
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	265,846	269,179
Fair Value, Measurements, Recurring | Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	965,655	836,348
Fair Value, Measurements, Recurring | Residential - Government Agencies
Assets:
Available-for-Sale: Fair Value	249,976	243,844
Fair Value, Measurements, Recurring | Residential - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	642,113	506,987
Fair Value, Measurements, Recurring | Commercial - Government Agencies
Assets:
Available-for-Sale: Fair Value	73,566	85,517
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale: Fair Value	541	539
Loans Held for Sale	0	0
Mortgage Servicing Rights	0	0
Other Assets	28,064	21,952
Derivatives	0	0
Total Assets Measured at Fair Value on a Recurring Basis	28,605	22,491
Liabilites:
Derivatives	0	0
Total Liabilities Measured at Fair Value on a Recurring Basis	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale: Fair Value	541	539
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - Government Agencies
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial - Government Agencies
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale: Fair Value	2,322,127	2,185,502
Loans Held for Sale	9,752	62,499
Mortgage Servicing Rights	0	0
Other Assets	0	0
Derivatives	102	926
Total Assets Measured at Fair Value on a Recurring Basis	2,331,981	2,248,927
Liabilites:
Derivatives	760	836
Total Liabilities Measured at Fair Value on a Recurring Basis	760	836
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale: Fair Value	448,663	408,176
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	641,963	671,799
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	265,846	269,179
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	965,655	836,348
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies
Assets:
Available-for-Sale: Fair Value	249,976	243,844
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	642,113	506,987
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies
Assets:
Available-for-Sale: Fair Value	73,566	85,517
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3)
Assets:
Available-for-Sale: Fair Value	0	0
Loans Held for Sale	0	0
Mortgage Servicing Rights	1,509	1,655
Other Assets	0	0
Derivatives	11,484	12,805
Total Assets Measured at Fair Value on a Recurring Basis	12,993	14,460
Liabilites:
Derivatives	10,169	11,752
Total Liabilities Measured at Fair Value on a Recurring Basis	10,169	11,752
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Residential - Government Agencies
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Residential - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Commercial - Government Agencies
Assets:
Available-for-Sale: Fair Value	$ 0	$ 0

Fair Value of Assets and Liab75

Fair Value of Assets and Liabilities (FV on recurring basis-Level 3 rollforward) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Mortgage Servicing Rights, Beginning Balance	$ 1,548	$ 1,819	$ 1,655	$ 1,970
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income	(39)	(79)	(146)	(230)
Fair Value, Mortgage Servicing Rights, Ending Balance	1,509	1,740	1,509	1,740
Fair Value, Mortgage Service Rights, Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Net Derivative Assets and Liabilities, Beginning Balance	1,369	1,908	1,053	240
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income	1,561	4,149	4,469	8,003
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale	(1,631)	(3,696)	(4,581)	(5,882)
Variation margin payments for swap liabilities	16		374
Fair Value, Net Derivative Assets and Liabilities, Ending Balance	1,315	2,361	1,315	2,361
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held	$ 1,315	$ 2,361	$ 1,315	$ 2,361

Fair Value of Assets and Liab76

Fair Value of Assets and Liabilities (FV on recurring or nonrecurring basis-level 3 inputs) (Details 3) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
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)	93.40%	92.26%
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 958	$ 1,067
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)	0.16%	0.13%
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 357	$ (14)
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)	9.21%	8.13%
Weighted Average Discount Rate (as a percent)	8.89%	9.33%
Mortgage Servicing Rights, at Fair Value	$ 25,270	$ 26,803

Fair Value of Assets and Liab77

Fair Value of Assets and Liabilities (Fair value on a nonrecurring basis) (Details 4) $ in Thousands	Sep. 30, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage Servicing Rights accounted for under the amortization method, valuation allowance	$ 210
Fair Value, Measurements, Nonrecurring | 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	$ 22,927

Fair Value of Assets and Liab78

Fair Value of Assets and Liabilities (FV option) (Details 5) - Residential mortgage loans held for sale - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Option
Aggregate Fair Value	$ 9,752	$ 62,499
Aggregate Unpaid Principal	9,458	61,782
Aggregate Fair Value Less Aggregate Unpaid Principal	$ 294	$ 717

Fair Value of Assets and Liab79

Fair Value of Assets and Liabilities (Financial instruments not recorded at FV on recurring basis) (Details 6) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 3,960,956	$ 3,827,527
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	3,960,598	3,832,997
Loans	9,193,837	8,583,726
Financial Instruments - Liabilities
Time Deposits	1,962,092	1,217,707
Securities Sold Under Agreements to Repurchase	505,293	523,378
Other Debt	257,153	257,153
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	3,960,956	3,827,527
Loans	9,361,879	8,743,191
Financial Instruments - Liabilities
Time Deposits	1,956,957	1,213,705
Securities Sold Under Agreements to Repurchase	505,278	523,374
Other Debt	256,548	256,718
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments - Assets
Held-to-Maturity: Fair Value	424,731	530,940
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	0	0
Fair Value | Significant Other Observable Inputs (Level 2)
Financial Instruments - Assets
Held-to-Maturity: Fair Value	3,536,225	3,296,587
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	1,956,957	1,213,705
Securities Sold Under Agreements to Repurchase	505,278	523,374
Other Debt	256,548	256,718
Fair Value | Significant Other Unobservable Inputs (Level 3)
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	9,361,879	8,743,191
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	$ 0	$ 0