1st Source (SRCE) 10-Q 19 Oct 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 13, 2017
Document and Entity Information
Entity Registrant Name	1ST SOURCE CORP
Entity Central Index Key	34,782
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	Accelerated Filer
Entity Common Stock, Shares Outstanding		25,936,130
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 64,636	$ 58,578
Federal funds sold and interest bearing deposits with other banks	34,788	49,726
Investment securities available-for-sale	893,973	850,467
Other investments	25,953	22,458
Mortgages held for sale	11,000	15,849
Loans and leases - net of unearned discount
Loans and leases	4,436,718	4,188,071
Reserve for loan and lease losses	(93,372)	(88,543)
Net loans and leases	4,343,346	4,099,528
Equipment owned under operating leases, net	145,975	118,793
Net premises and equipment	53,324	56,708
Goodwill and intangible assets	83,795	84,102
Accrued income and other assets	149,945	130,059
Total assets	5,806,735	5,486,268
Deposits:
Noninterest-bearing demand	1,019,106	991,256
Interest-bearing deposits:
Interest-bearing demand	1,493,187	1,471,526
Savings	825,147	814,326
Time	1,236,272	1,056,652
Total interest-bearing deposits	3,554,606	3,342,504
Total deposits	4,573,712	4,333,760
Short-term borrowings:
Federal funds purchased and securities sold under agreements to repurchase	148,001	162,913
Other short-term borrowings	168,764	129,030
Total short-term borrowings	316,765	291,943
Long-term debt and mandatorily redeemable securities	70,482	74,308
Subordinated notes	58,764	58,764
Accrued expenses and other liabilities	76,515	54,843
Total liabilities	5,096,238	4,813,618
SHAREHOLDERS' EQUITY
Preferred stock; no par value Authorized 10,000,000 shares; none issued or outstanding	0	0
Common stock; no par value Authorized 40,000,000 shares; issued 28,205,674 at September 30, 2017 and December 31, 2016	436,538	436,538
Retained earnings	327,149	290,824
Cost of common stock in treasury (2,269,544 shares at September 30, 2017 and 2,329,909 shares at December 31, 2016)	(54,643)	(56,056)
Accumulated other comprehensive income	1,453	1,344
Total shareholders' equity	710,497	672,650
Total liabilities and shareholders' equity	5,806,735	5,486,268
Commercial and agricultural
Loans and leases - net of unearned discount
Loans and leases	893,174	812,264
Reserve for loan and lease losses	(15,738)	(14,668)
Auto and light truck
Loans and leases - net of unearned discount
Loans and leases	505,126	411,764
Reserve for loan and lease losses	(10,963)	(8,064)
Medium and heavy duty truck
Loans and leases - net of unearned discount
Loans and leases	287,975	294,790
Reserve for loan and lease losses	(4,740)	(4,740)
Aircraft
Loans and leases - net of unearned discount
Loans and leases	816,120	802,414
Reserve for loan and lease losses	(33,530)	(34,352)
Construction equipment
Loans and leases - net of unearned discount
Loans and leases	541,838	495,925
Reserve for loan and lease losses	(9,251)	(8,207)
Commercial real estate
Loans and leases - net of unearned discount
Loans and leases	740,345	719,170
Reserve for loan and lease losses	(14,266)	(13,677)
Residential real estate and home equity
Loans and leases - net of unearned discount
Loans and leases	524,071	521,931
Reserve for loan and lease losses	(3,608)	(3,550)
Consumer
Loans and leases - net of unearned discount
Loans and leases	128,069	129,813
Reserve for loan and lease losses	$ (1,276)	$ (1,285)

CONSOLIDATED STATEMENTS OF FIN3

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock; no par value (in dollars per share)	$ 0	$ 0
Preferred stock, Authorized shares	10,000,000	10,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock; no par value (in dollars per share)	$ 0	$ 0
Common stock, Authorized shares	40,000,000	40,000,000
Common stock, issued shares	28,205,674	28,205,674
Cost of common stock in treasury, shares	2,269,544	2,329,909

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans and leases	$ 50,429	$ 44,965	$ 143,345	$ 131,592
Investment securities, taxable	3,048	2,384	9,932	8,504
Investment securities, tax-exempt	628	672	1,988	2,061
Other	325	279	935	879
Total interest income	54,430	48,300	156,200	143,036
Interest expense:
Deposits	5,186	3,879	13,431	11,440
Short-term borrowings	396	150	895	430
Subordinated notes	1,022	1,055	3,132	3,165
Long-term debt and mandatorily redeemable securities	597	522	1,925	1,725
Total interest expense	7,201	5,606	19,383	16,760
Net interest income	47,229	42,694	136,817	126,276
Provision for loan and lease losses	1,620	2,067	5,358	5,091
Net interest income after provision for loan and lease losses	45,609	40,627	131,459	121,185
Noninterest income:
Trust and wealth advisory	5,037	4,691	15,665	14,422
Service charges on deposit accounts	2,468	2,366	7,171	6,749
Debit card	2,983	2,745	8,719	8,160
Mortgage banking	1,486	1,334	3,737	3,495
Insurance commissions	1,429	1,350	4,506	4,146
Equipment rental	7,917	6,657	22,335	19,247
Gains on investment securities available-for-sale	1,007	989	2,757	790
Other	3,265	2,533	8,145	9,580
Total noninterest income	25,592	22,665	73,035	66,589
Noninterest expense:
Salaries and employee benefits	22,016	22,136	64,073	64,681
Net occupancy	2,806	2,435	7,768	7,243
Furniture and equipment	5,363	4,898	15,264	14,499
Depreciation - leased equipment	6,565	5,570	18,541	16,115
Professional fees	1,765	1,244	4,514	3,653
Supplies and communication	1,316	1,256	3,911	4,138
FDIC and other insurance	693	647	1,889	2,437
Business development and marketing	1,199	1,263	4,352	3,268
Loan and lease collection and repossession	1,093	324	2,058	1,136
Other	1,644	1,372	4,314	4,714
Total noninterest expense	44,460	41,145	126,684	121,884
Income before income taxes	26,741	22,147	77,810	65,890
Income tax expense	9,559	7,883	27,753	23,329
Net income	$ 17,182	$ 14,264	$ 50,057	$ 42,561
Per common share:
Basic net income per common share (in dollars per share)	$ 0.66	$ 0.55	$ 1.92	$ 1.63
Diluted net income per common share (in dollars per share)	0.66	0.55	1.92	1.63
Cash dividends (in dollars per share)	$ 0.19	$ 0.18	$ 0.56	$ 0.54
Basic weighted average common shares outstanding (in shares)	25,935,867	25,867,169	25,922,218	25,881,360
Diluted weighted average common shares outstanding (in shares)	25,935,867	25,867,169	25,922,218	25,881,360

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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	$ 17,182	$ 14,264	$ 50,057	$ 42,561
Other comprehensive income (loss):
Change in unrealized (depreciation) appreciation of available-for-sale securities	(568)	(905)	2,932	5,742
Reclassification adjustment for realized (gains) losses included in net income	(1,007)	(989)	(2,757)	(790)
Income tax effect	591	711	(66)	(1,859)
Other comprehensive (loss) income, net of tax	(984)	(1,183)	109	3,093
Comprehensive income	$ 16,198	$ 13,081	$ 50,166	$ 45,654

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Cost of Common Stock in Treasury	Accumulated Other Comprehensive Income (Loss), Net
Balance at Dec. 31, 2015	$ 644,053	$ 436,538	$ 251,812	$ (50,852)	$ 6,555
Increase (Decrease) in Shareholders' Equity
Net income	42,561		42,561
Other comprehensive income (loss)	3,093				3,093
Issuance of 61,265 and 109,887 common shares under stock based compensation awards for the nine months ended on September 30, 2017 and 2016, respectively	2,616		(4)	2,620
Cost of 900 and 270,378 shares of common stock acquired for treasury for the nine months ended on September 30, 2017 and 2016, respectively	(8,030)			(8,030)
Common stock dividend ($0.56 and $0.54 per share for the nine months ended on September 30, 2017 and 2016, respectively)	(14,034)		(14,034)
Balance at Sep. 30, 2016	670,259	436,538	280,335	(56,262)	9,648
Balance at Dec. 31, 2016	672,650	436,538	290,824	(56,056)	1,344
Cumulative-effect adjustment at Dec. 31, 2016	(65)		(65)
Balance, adjusted at Dec. 31, 2016	672,585	436,538	290,759	(56,056)	1,344
Increase (Decrease) in Shareholders' Equity
Net income	50,057		50,057
Other comprehensive income (loss)	109				109
Issuance of 61,265 and 109,887 common shares under stock based compensation awards for the nine months ended on September 30, 2017 and 2016, respectively	2,344		890	1,454
Cost of 900 and 270,378 shares of common stock acquired for treasury for the nine months ended on September 30, 2017 and 2016, respectively	(41)			(41)
Common stock dividend ($0.56 and $0.54 per share for the nine months ended on September 30, 2017 and 2016, respectively)	(14,557)		(14,557)
Balance at Sep. 30, 2017	$ 710,497	$ 436,538	$ 327,149	$ (54,643)	$ 1,453

CONSOLIDATED STATEMENTS OF SHA7

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Issuance of common shares under stock based compensation awards	61,265	109,887
Common stock acquired for treasury	900	270,378
Common stock dividend (in dollars per share)	$ 0.56	$ 0.54

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 50,057	$ 42,561
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	5,358	5,091
Depreciation of premises and equipment	4,309	3,897
Depreciation of equipment owned and leased to others	18,541	16,115
Stock-based compensation	2,158	2,036
Amortization of investment securities premiums and accretion of discounts, net	4,206	4,594
Amortization of mortgage servicing rights	821	1,133
Deferred income taxes	(4,230)	82
(Gains) losses on investment securities available-for-sale	(2,757)	(790)
Originations of loans held for sale, net of principal collected	(75,387)	(88,161)
Proceeds from the sales of loans held for sale	82,572	80,474
Net gain on sale of loans held for sale	(2,336)	(2,474)
Net loss (gain) on sale of other real estate and repossessions	48	(154)
Change in interest receivable	(2,863)	(1,204)
Change in interest payable	1,293	1,089
Change in other assets	(3,054)	(2,896)
Change in other liabilities	16,445	4,820
Other	3,499	(367)
Net change in operating activities	98,680	65,846
Investing activities:
Proceeds from sales of investment securities available-for-sale	2,927	5,139
Proceeds from maturities and paydowns of investment securities available-for-sale	133,541	158,178
Purchases of investment securities available-for-sale	(181,752)	(199,056)
Proceeds from liquidation of partnership investment	0	2,903
Net change in other investments	3,495	485
Loans sold or participated to others	13,049	0
Net change in loans and leases	(269,881)	(191,881)
Net change in equipment owned under operating leases	(45,723)	(23,627)
Purchases of premises and equipment	(2,801)	(5,532)
Proceeds from sales of other real estate and repossessions	2,761	1,523
Net change in investing activities	(351,374)	(252,838)
Financing activities:
Net change in demand deposits and savings accounts	60,332	211,917
Net change in time deposits	179,620	25,935
Net change in short-term borrowings	24,822	(17,222)
Proceeds from issuance of long-term debt	19,999	10,837
Payments on long-term debt	(26,015)	(5,928)
Stock issued under stock purchase plans	153	116
Acquisition of treasury stock	(41)	(8,030)
Cash dividends paid on common stock	(15,056)	(14,530)
Net change in financing activities	243,814	203,095
Net change in cash and cash equivalents	(8,880)	16,103
Cash and cash equivalents, beginning of year	108,304	79,721
Cash and cash equivalents, end of period	99,424	95,824
Non-cash transactions:
Loans transferred to other real estate and repossessed assets	7,656	2,850
Common stock matching contribution to Employee Stock Ownership and Profit Sharing Plan	$ 1,426	$ 800

Accounting Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies 1st Source Corporation is a bank holding company headquartered in South Bend, Indiana that provides, through its subsidiaries (collectively referred to as “1st Source” or “the Company”), a broad array of financial products and services. Basis of Presentation – The accompanying unaudited consolidated financial statements reflect all adjustments (all of which are normal and recurring in nature) which are, in the opinion of management, necessary for a fair presentation of the consolidated financial position, the results of operations, changes in comprehensive income, changes in shareholders’ equity, and cash flows for the periods presented. These unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission (SEC) and, therefore, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP) have been omitted. The Notes to the Consolidated Financial Statements appearing in 1st Source Corporation’s Annual Report on Form 10-K (2016 Annual Report), which include descriptions of significant accounting policies, should be read in conjunction with these interim financial statements. The Consolidated Statement of Financial Condition at December 31, 2016 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. Certain amounts in the prior period consolidated financial statements have been reclassified to conform to the current year presentation. Use of Estimates in the Preparation of Financial Statements – Financial statements prepared in accordance with GAAP require the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expense during the reporting period. Actual results could differ from those estimates. Loans and Leases – Loans are stated at the principal amount outstanding, net of unamortized deferred loan origination fees and costs and net of unearned income. Interest income is accrued as earned based on unpaid principal balances. Origination fees and direct loan and lease origination costs are deferred and the net amount amortized to interest income over the estimated life of the related loan or lease. Loan commitment fees are deferred and amortized into other income over the commitment period. Direct financing leases are carried at the aggregate of lease payments plus estimated residual value of the leased property, net of unamortized deferred lease origination fees and costs and unearned income. Interest income on direct financing leases is recognized over the term of the lease to achieve a constant periodic rate of return on the outstanding investment. The accrual of interest on loans and leases is discontinued when a loan or lease becomes contractually delinquent for 90 days, or when an individual analysis of a borrower’s credit worthiness indicates a credit should be placed on nonperforming status, except for residential mortgage loans and consumer loans that are well secured and in the process of collection. Residential mortgage loans are placed on nonaccrual at the time the loan is placed in foreclosure. When interest accruals are discontinued, interest credited to income in the current year is reversed and interest accrued in the prior year is charged to the reserve for loan and lease losses. However, in some cases, the Company may elect to continue the accrual of interest when the net realizable value of collateral is sufficient to cover the principal and accrued interest. When a loan or lease is classified as nonaccrual and the future collectibility of the recorded loan or lease balance is doubtful, collections on interest and principal are applied as a reduction to principal outstanding. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured, which is typically evidenced by a sustained repayment performance of at least six months . A loan or lease is considered impaired, based on current information and events, if it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan or lease agreement. Interest on impaired loans and leases, which are not classified as nonaccrual, is recognized on the accrual basis. The Company evaluates loans and leases exceeding $100,000 for impairment and establishes a specific reserve as a component of the reserve for loan and lease losses when it is probable all amounts due will not be collected pursuant to the contractual terms of the loan or lease and the recorded investment in the loan or lease exceeds its fair value. Loans and leases that have been modified and economic concessions have been granted to borrowers who have experienced financial difficulties are considered a troubled debt restructuring (TDR) and, by definition, are deemed an impaired loan. These concessions typically result from the Company’s loss mitigation activities and may include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. Certain TDRs are classified as nonperforming at the time of restructuring and typically are returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period of at least six months. When the Company modifies loans and leases in a TDR, it evaluates any possible impairment similar to other impaired loans based on the present value of expected future cash flows, discounted at the contractual interest rate of the original loan or lease agreement, or uses the current fair value of the collateral, less selling costs for collateral dependent loans. If the Company determines that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premium or discount), impairment is recognized through a reserve for loan and lease losses estimate or a charge-off to the reserve for loan and lease losses. In periods subsequent to modification, the Company evaluates all TDRs, including those that have payment defaults, for possible impairment and recognizes impairment through the reserve for loan and lease losses.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Share Based Payment Awards: In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2017-09 “ Compensation - Stock Compensation (Topic 718), Scope of Modification Accounting.” These amendments provide guidance on determining which changes to the terms and conditions of share-based payment awards require an entity to apply modification accounting under Topic 718. The guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. The amendments should be applied on a prospective basis to an award modified on or after the adoption date. The Company is assessing the impact of ASU 2017-09 and does not expect it to have a material impact on its accounting and disclosures. Premium Amortization: In March 2017, the FASB issued ASU No. 2017-08 “ Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities.” These amendments shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The guidance is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The amendments should be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company is assessing the impact of ASU 2017-08 on its accounting and disclosures. Sale of Nonfinancial Assets: In February 2017, the FASB issued ASU No. 2017-05 “ Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets.” 'The amendments clarify that a financial asset is within the scope of Subtopic 610-20 if it meets the definition of an in substance nonfinancial asset. The amendments also define the term in substance nonfinancial asset. The amendments clarify that nonfinancial assets within the scope of Subtopic 610-20 may include nonfinancial assets transferred within a legal entity to a counterparty. For example, a parent may transfer control of nonfinancial assets by transferring ownership interests in a consolidated subsidiary. A contract that includes the transfer of ownership interests in one or more consolidated subsidiaries is within the scope of Subtopic 610-20 if substantially all of the fair value of the assets that are promised to the counterparty in a contract is concentrated in nonfinancial assets. The amendments clarify that an entity should identify each distinct nonfinancial asset or in substance nonfinancial asset promised to a counterparty and derecognize each asset when a counterparty obtains control of it. The guidance is effective for public business entities for annual periods beginning after December 15, 2017 and interim periods therein. Entities may use either a full or modified approach to adopt the ASU. The Company is assessing ASU 2017-05 and does not expect it to have a material impact on its accounting and disclosures. Simplifying the Test for Goodwill Impairment: In January 2017, the FASB issued ASU No. 2017-04 “ Intangibles - Goodwill and Other (Topic 350) - Simplifying the Test for Goodwill Impairment.” These amendments eliminate Step 2 from the goodwill impairment test. The amendments also eliminate the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The guidance is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. ASU 2017-04 should be adopted on a prospective basis. The Company has assessed ASU 2017-04 and does not expect it to have a material impact on its accounting and disclosures. Business Combinations: In January 2017, the FASB issued ASU No. 2017-01 “ Business Combinations (Topic 805) - Clarifying the Definition of a Business.” ASU 2017-01 provides amendments to clarify the definition of a business and affect all companies and other reporting organizations that must determine whether they have acquired or sold a business. The amendments are intended to help companies and other organizations evaluate whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years and should be applied prospectively as of the beginning of the period of adoption. Early adoption is permitted under certain circumstances. The Company has assessed ASU 2017-01 and does not expect it to have a material impact on its accounting and disclosures. Restricted Cash: In November 2016, the FASB issued ASU No. 2016-18 “ Statement of Cash Flows (Topic 230) - Restricted Cash.” ASU 2016-18 provides amendments to cash flow statement classification and presentation to explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years and should be applied using a retrospective transition method to each period presented. Early adoption is permitted, including adoption in an interim period. The Company has assessed ASU 2016-18 and does not expect a material impact on its accounting and disclosures. Intra-Entity Transfers of Assets Other Than Inventory: In October 2016, the FASB issued ASU No. 2016-16 “ Income Taxes (Topic 740) - Intra-Entity Transfers of Assets Other Than Inventory.” The amendments in ASU 2016-16 require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The amendments eliminate the exception for an intra-entity transfer of an asset other than inventory. The amendments do not include new disclosure requirements; however existing disclosure requirements might be applicable when accounting for the current and deferred income taxes for an intra-entity transfer of an asset other than inventory. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years and should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. The Company has assessed ASU 2016-16 and does not expect a material impact on its accounting and disclosures. Classification of Certain Cash Receipts and Cash Payments: In August 2016, the FASB issued ASU No. 2016-15 “ Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 provides cash flow statement classification guidance for certain transactions including how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years and should be applied retrospectively. Early adoption is permitted, including adoption in an interim period. The Company has assessed ASU 2016-15 and does not expect a material impact on its accounting and disclosures. Measurement of Credit Losses on Financial Instruments: In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments-Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments.” The provisions of ASU 2016-13 were issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments that are not accounted for at fair value through net income, including loans held for investment, held-to-maturity debt securities, trade and other receivables, net investment in leases and other commitments to extend credit held by a reporting entity at each reporting date. ASU 2016-13 requires that financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The amendments in ASU 2016-13 eliminate the probable incurred loss recognition in current GAAP and reflect an entity’s current estimate of all expected credit losses. The measurement of expected credit losses is based upon historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the financial assets. For purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (“PCD assets”) that are measured at amortized cost, the initial allowance for credit losses is added to the purchase price rather than being reported as a credit loss expense. Subsequent changes in the allowance for credit losses on PCD assets are recognized through the statement of income as a credit loss expense. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses rather than as a direct write-down to the security. ASU 2016-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company has an implementation team working through the provisions of ASU 2016-13 including assessing the impact on its accounting and disclosures. Share Based Payment Accounting: In March 2016, the FASB issued ASU No. 2016-09 “ Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also allows an employer to repurchase more of an employee’s shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election for forfeitures as they occur. The guidance is effective for public business entities for fiscal years beginning after December 15, 2016, and interim periods within those years. Early adoption is permitted. The Company adopted ASU 2016-09 on January 1, 2017 on a modified retrospective method through a cumulative adjustment to retained earnings related to the policy election to account for forfeitures as they occur. The adoption of ASU 2016-09 did not have a material impact on its accounting and disclosures. Leases: In February 2016, the FASB issued ASU No. 2016-02 “ Leases (Topic 842).” ASU 2016-02 establishes a right of use model that requires a lessee to record a right of use asset and a lease liability for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. For lessors, the guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. A lease will be treated as sale if it transfers all of the risks and rewards, as well as control of the underlying asset, to the lessee. If risks and rewards are conveyed without the transfer of control, the lease is treated as a financing. If the lessor doesn’t convey risks and rewards or control, an operating lease results. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years for public business entities. 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, with certain practical expedients available. Early adoption is permitted. The Company has an implementation team working through the provisions of ASU 2016-02 including a review of all leases to assess the impact on its accounting, disclosures and the election of certain practical expedients. It is expected that the Company will recognize discounted right of use assets and lease liabilities (estimated between $12 and $15 million as of January 1, 2017) upon adoption on January 1, 2019. The estimates will change due to changes in the lease portfolio. Recognition and Measurement of Financial Instruments: In January 2016, the FASB issued ASU No. 2016-01 “ Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 is intended to improve the recognition and measurement of financial instruments by requiring equity investments to be measured at fair value with changes in fair value recognized in net income; requiring public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; requiring separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; eliminating 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 and amortized at cost on the balance sheet; and requiring a reporting organization 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 organization has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. ASU 2016-01 is effective for annual periods and interim periods within those annual periods, beginning after December 15, 2017. The amendments should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively to equity investments that exist as of the date of adoption. The Company is continuing to assess the impact of ASU 2016-01 on its accounting for equity investments, fair value disclosures and other disclosure requirements. Revenue from Contracts with Customers: In May 2014, the FASB issued ASU No. 2014-09 “ Revenue from Contracts with Customers (Topic 606).” The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. On July 9, 2015, the FASB approved amendments deferring the effective date by one year. ASU 2014-09 is now effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Early application is permitted but not before the original public entity effective date, i.e ., annual periods beginning after December 15, 2016. In March 2016, the FASB issued final amendments (ASU No. 2016-08 and ASU No. 2016-10) to clarify the implementation guidance for principal versus agent considerations, identifying performance obligations and the accounting for licenses of intellectual property. The amendments can be applied retrospectively to each prior reporting period or retrospectively with the cumulative effect of initially applying this Update recognized at the date of initial application. In May 2016, the FASB issued final amendments (ASU No. 2016-12 and ASU 2016-11) to address narrow-scope improvements to the guidance on collectibility, non-cash consideration, completed contracts at transition and to provide a practical expedient for contract modifications at transition and an accounting policy election related to the presentation of sales taxes and other similar taxes collected from customers. Additionally, the amendments included a rescission of SEC guidance because of ASU 2014-09 related to revenue and expense recognition for freight services in process, accounting for shipping and handling fees and costs, and accounting for consideration given by a vendor to a customer. In December 2016, the FASB issued final guidance (ASU 2016-20) that allows entities not to make quantitative disclosures about performance obligations in certain cases and requires entities that use any of the new or previously existing optional exemptions to expand their qualitative disclosures. It also makes 12 additional technical corrections and improvements to the new revenue standard. These amendments are effective upon the adoption of ASU 2014-09. The Company’s revenue is comprised of net interest income, which is explicitly excluded from the scope of ASU 2014-09, and noninterest income. ASU 2014-09 may require the Company to change how it recognizes certain recurring revenue streams related to noninterest income. The Company continues to follow the guidance from the FASB and the Transition Resource Group for Revenue Recognition related to noninterest income and expects the adoption of ASU 2014-09 on January 1, 2018 will not have a material impact on its accounting and disclosures.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Available-For-Sale The following table shows investment securities available-for-sale. (Dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value September 30, 2017 U.S. Treasury and Federal agencies securities $ 460,282 $ 453 $ (3,109 ) $ 457,626 U.S. States and political subdivisions securities 122,178 1,407 (459 ) 123,126 Mortgage-backed securities — Federal agencies 276,791 1,989 (1,923 ) 276,857 Corporate debt securities 31,599 48 (168 ) 31,479 Foreign government and other securities 200 2 — 202 Total debt securities 891,050 3,899 (5,659 ) 889,290 Marketable equity securities 598 4,098 (13 ) 4,683 Total investment securities available-for-sale $ 891,648 $ 7,997 $ (5,672 ) $ 893,973 December 31, 2016 U.S. Treasury and Federal agencies securities $ 424,495 $ 809 $ (4,471 ) $ 420,833 U.S. States and political subdivisions securities 133,509 1,036 (1,570 ) 132,975 Mortgage-backed securities — Federal agencies 252,981 2,175 (2,582 ) 252,574 Corporate debt securities 35,266 111 (301 ) 35,076 Foreign government and other securities 800 7 — 807 Total debt securities 847,051 4,138 (8,924 ) 842,265 Marketable equity securities 1,265 7,007 (70 ) 8,202 Total investment securities available-for-sale $ 848,316 $ 11,145 $ (8,994 ) $ 850,467 At September 30, 2017 and December 31, 2016 , the residential mortgage-backed securities held by the Company consisted primarily of GNMA, FNMA and FHLMC pass-through certificates which are guaranteed by those respective agencies of the United States government (Government Sponsored Enterprise, GSEs). The following table shows the contractual maturities of investments in debt securities available-for-sale at September 30, 2017 . Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. (Dollars in thousands) Amortized Cost Fair Value Due in one year or less $ 119,304 $ 119,624 Due after one year through five years 448,884 446,985 Due after five years through ten years 46,071 45,824 Due after ten years — — Mortgage-backed securities 276,791 276,857 Total debt securities available-for-sale $ 891,050 $ 889,290 The following table summarizes gross unrealized losses and fair value by investment category and age. Less than 12 Months 12 months or Longer Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2017 U.S. Treasury and Federal agencies securities $ 238,505 $ (1,482 ) $ 97,156 $ (1,627 ) $ 335,661 $ (3,109 ) U.S. States and political subdivisions securities 17,119 (107 ) 22,213 (352 ) 39,332 (459 ) Mortgage-backed securities - Federal agencies 108,863 (1,043 ) 59,233 (880 ) 168,096 (1,923 ) Corporate debt securities 9,789 (13 ) 8,134 (155 ) 17,923 (168 ) Foreign government and other securities — — — — — — Total debt securities 374,276 (2,645 ) 186,736 (3,014 ) 561,012 (5,659 ) Marketable equity securities 149 (12 ) 3 (1 ) 152 (13 ) Total investment securities available-for-sale $ 374,425 $ (2,657 ) $ 186,739 $ (3,015 ) $ 561,164 $ (5,672 ) December 31, 2016 U.S. Treasury and Federal agencies securities $ 263,680 $ (4,471 ) $ — $ — $ 263,680 $ (4,471 ) U.S. States and political subdivisions securities 74,129 (1,515 ) 3,337 (55 ) 77,466 (1,570 ) Mortgage-backed securities - Federal agencies 168,554 (2,341 ) 5,102 (241 ) 173,656 (2,582 ) Corporate debt securities 13,312 (301 ) — — 13,312 (301 ) Foreign government and other securities — — — — — — Total debt securities 519,675 (8,628 ) 8,439 (296 ) 528,114 (8,924 ) Marketable equity securities 280 (70 ) 4 — 284 (70 ) Total investment securities available-for-sale $ 519,955 $ (8,698 ) $ 8,443 $ (296 ) $ 528,398 $ (8,994 ) The initial indication of potential other-than-temporary-impairment (OTTI) for both debt and equity securities is a decline in fair value below amortized cost. Quarterly, the impaired securities are analyzed on a qualitative and quantitative basis in determining OTTI. Declines in the fair value of available-for-sale debt securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of impairment related to other factors is recognized in other comprehensive income. In estimating OTTI losses, the Company considers among other things, (i) the length of time and the extent to which fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) whether it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. At September 30, 2017 , the Company does not have the intent to sell any of the available-for-sale securities in the table above and believes that it is more likely than not, that it will not have to sell any such securities before an anticipated recovery of cost. Primarily the unrealized losses on debt securities are due to increases in market rates over the yields available at the time the underlying securities were purchased. The fair value is expected to recover on all debt securities as they approach their maturity date or re-pricing date or if market yields for such investments decline. The Company does not believe any of the securities are impaired due to reasons of credit quality. The following table shows the gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses of all securities are computed using the specific identification cost basis. Three Months Ended Nine Months Ended (Dollars in thousands) 2017 2016 2017 2016 Gross realized gains $ 1,007 $ 989 $ 2,947 $ 1,084 Gross realized losses — — — — OTTI losses — — (190 ) (294 ) Net realized gains (losses) $ 1,007 $ 989 $ 2,757 $ 790 At September 30, 2017 and December 31, 2016 , investment securities available-for-sale with carrying values of $279.99 million and $276.29 million , respectively, were pledged as collateral for security repurchase agreements and for other purposes.

Loan and Lease Financings

Loan and Lease Financings	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loan and Lease Financings	Loan and Lease Financings The Company evaluates loans and leases for credit quality at least annually but more frequently if certain circumstances occur (such as material new information which becomes available and indicates a potential change in credit risk). The Company uses two methods to assess credit risk: loan or lease credit quality grades and credit risk classifications. The purpose of the loan or lease credit quality grade is to document the degree of risk associated with individual credits as well as inform management of the degree of risk in the portfolio taken as a whole. Credit risk classifications are used to categorize loans by degree of risk and to designate individual or committee approval authorities for higher risk credits at the time of origination. Credit risk classifications include categories for: Acceptable, Marginal, Special Attention, Special Risk, Restricted by Policy, Regulated and Prohibited by Law. All loans and leases, except residential real estate and home equity loans and consumer loans, are assigned credit quality grades on a scale from 1 to 12 with grade 1 representing superior credit quality. The criteria used to assign grades to extensions of credit that exhibit potential problems or well-defined weaknesses are primarily based upon the degree of risk and the likelihood of orderly repayment, and their effect on the Company’s safety and soundness. Loans or leases graded 7 or weaker are considered “special attention” credits and, as such, relationships in excess of $100,000 are reviewed quarterly as part of management’s evaluation of the appropriateness of the reserve for loan and lease losses. Grade 7 credits are defined as “watch” and contain greater than average credit risk and are monitored to limit the exposure to increased risk; grade 8 credits are “special mention” and, following regulatory guidelines, are defined as having potential weaknesses that deserve management’s close attention. Credits that exhibit well-defined weaknesses and a distinct possibility of loss are considered “classified” and are graded 9 through 12 corresponding to the regulatory definitions of “substandard” (grades 9 and 10) and the more severe “doubtful” (grade 11) and “loss” (grade 12). The following table shows the credit quality grades of the recorded investment in loans and leases, segregated by class. Credit Quality Grades (Dollars in thousands) 1-6 7-12 Total September 30, 2017 Commercial and agricultural $ 869,111 $ 24,063 $ 893,174 Auto and light truck 490,765 14,361 505,126 Medium and heavy duty truck 282,200 5,775 287,975 Aircraft 794,533 21,587 816,120 Construction equipment 529,910 11,928 541,838 Commercial real estate 728,331 12,014 740,345 Total $ 3,694,850 $ 89,728 $ 3,784,578 December 31, 2016 Commercial and agricultural $ 784,811 $ 27,453 $ 812,264 Auto and light truck 407,931 3,833 411,764 Medium and heavy duty truck 291,558 3,232 294,790 Aircraft 772,802 29,612 802,414 Construction equipment 486,923 9,002 495,925 Commercial real estate 707,252 11,918 719,170 Total $ 3,451,277 $ 85,050 $ 3,536,327 For residential real estate and home equity and consumer loans, credit quality is based on the aging status of the loan and by payment activity. The following table shows the recorded investment in residential real estate and home equity and consumer loans by performing or nonperforming status. Nonperforming loans are those loans which are on nonaccrual status or are 90 days or more past due. (Dollars in thousands) Performing Nonperforming Total September 30, 2017 Residential real estate and home equity $ 521,928 $ 2,143 $ 524,071 Consumer 127,881 188 128,069 Total $ 649,809 $ 2,331 $ 652,140 December 31, 2016 Residential real estate and home equity $ 518,896 $ 3,035 $ 521,931 Consumer 129,585 228 129,813 Total $ 648,481 $ 3,263 $ 651,744 The following table shows the recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status. (Dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due and Accruing Total Accruing Loans Nonaccrual Total Financing Receivables September 30, 2017 Commercial and agricultural $ 888,356 $ 80 $ 31 $ — $ 888,467 $ 4,707 $ 893,174 Auto and light truck 502,339 489 34 — 502,862 2,264 505,126 Medium and heavy duty truck 287,975 — — — 287,975 — 287,975 Aircraft 805,389 8,503 — — 813,892 2,228 816,120 Construction equipment 541,279 367 — — 541,646 192 541,838 Commercial real estate 736,682 111 — — 736,793 3,552 740,345 Residential real estate and home equity 520,741 438 749 192 522,120 1,951 524,071 Consumer 127,240 502 139 16 127,897 172 128,069 Total $ 4,410,001 $ 10,490 $ 953 $ 208 $ 4,421,652 $ 15,066 $ 4,436,718 December 31, 2016 Commercial and agricultural $ 808,283 $ — $ — $ — $ 808,283 $ 3,981 $ 812,264 Auto and light truck 411,300 298 — — 411,598 166 411,764 Medium and heavy duty truck 294,790 — — — 294,790 — 294,790 Aircraft 791,559 1,429 3,316 — 796,304 6,110 802,414 Construction equipment 493,131 1,546 — — 494,677 1,248 495,925 Commercial real estate 713,482 133 — — 713,615 5,555 719,170 Residential real estate and home equity 517,212 1,310 374 394 519,290 2,641 521,931 Consumer 129,000 453 132 22 129,607 206 129,813 Total $ 4,158,757 $ 5,169 $ 3,822 $ 416 $ 4,168,164 $ 19,907 $ 4,188,071 The following table shows impaired loans and leases, segregated by class, and the corresponding reserve for impaired loan and lease losses. (Dollars in thousands) Recorded Investment Unpaid Principal Balance Related Reserve September 30, 2017 With no related reserve recorded: Commercial and agricultural $ 392 $ 392 $ — Auto and light truck — — — Medium and heavy duty truck 1,505 1,505 — Aircraft 2,157 2,157 — Construction equipment 593 593 — Commercial real estate 2,451 2,451 — Residential real estate and home equity — — — Consumer — — — Total with no related reserve recorded 7,098 7,098 — With a reserve recorded: Commercial and agricultural 4,066 4,066 444 Auto and light truck — — — Medium and heavy duty truck — — — Aircraft — — — Construction equipment — — — Commercial real estate 1,002 1,002 189 Residential real estate and home equity 353 356 136 Consumer — — — Total with a reserve recorded 5,421 5,424 769 Total impaired loans $ 12,519 $ 12,522 $ 769 December 31, 2016 With no related reserve recorded: Commercial and agricultural $ 1,700 $ 1,700 $ — Auto and light truck 115 115 — Medium and heavy duty truck — — — Aircraft 2,918 2,918 — Construction equipment 605 605 — Commercial real estate 2,607 2,607 — Residential real estate and home equity — — — Consumer — — — Total with no related reserve recorded 7,945 7,945 — With a reserve recorded: Commercial and agricultural 1,890 1,890 297 Auto and light truck — — — Medium and heavy duty truck — — — Aircraft 3,192 3,192 1,076 Construction equipment 562 562 35 Commercial real estate 2,765 2,765 322 Residential real estate and home equity 674 676 148 Consumer — — — Total with a reserve recorded 9,083 9,085 1,878 Total impaired loans $ 17,028 $ 17,030 $ 1,878 The following table shows average recorded investment and interest income recognized on impaired loans and leases, segregated by class. Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (Dollars in thousands) Average Recorded Investment Interest Income Average Recorded Investment Interest Income Average Recorded Investment Interest Income Average Recorded Investment Interest Income Commercial and agricultural $ 4,551 $ — $ 3,282 $ 1 $ 4,774 $ 1 $ 3,480 $ 5 Auto and light truck 208 — — — 158 — — — Medium and heavy duty truck 1,551 — — — 517 — — — Aircraft 2,519 5 9,051 2 5,830 5 5,806 2 Construction equipment 949 — 618 — 1,084 — 671 — Commercial real estate 2,881 2 2,961 — 3,168 2 5,821 123 Residential real estate and home equity 354 3 362 4 356 11 364 12 Consumer — — — — — — — — Total $ 13,013 $ 10 $ 16,274 $ 7 $ 15,887 $ 19 $ 16,142 $ 142 There were no loan and lease modifications classified as a troubled debt restructuring (TDR) during the three months ended September 30, 2017 and one nonperforming loan and lease modification classified as a TDR during the nine months ended September 30, 2017. There was one nonperforming loan and lease modification classified as a TDR during the three and nine months ended September 30, 2016 , respectively. The classification between nonperforming and performing is determined at the time of modification. Modification programs focus on extending maturity dates or modifying payment patterns with most TDRs experiencing a combination of concessions. Modifications do not result in the contractual forgiveness of principal or interest. There was one modification during 2017 and one modification during 2016 that resulted in an interest rate reduction below market rate. Consequently, the financial impact of the modification was immaterial. There were no TDRs which had payment defaults within the twelve months following modification during the three months ended September 30, 2017 and one nonperforming TDR which had a payment default within the twelve months following modification during the nine months ended September 30, 2017 . There were no TDRs which had payment defaults within the twelve months following modification during the three and nine months ended September 30, 2016 . Default occurs when a loan or lease is 90 days or more past due under the modified terms or transferred to nonaccrual. The following table shows the recorded investment of loans and leases classified as troubled debt restructurings as of September 30, 2017 and December 31, 2016 . (Dollars in thousands) September 30, December 31, Performing TDRs $ 353 $ 360 Nonperforming TDRs 617 1,642 Total TDRs $ 970 $ 2,002

Reserve for Loan and Lease Loss

Reserve for Loan and Lease Losses	9 Months Ended
	Sep. 30, 2017
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Reserve for Loan and Lease Losses	Reserve for Loan and Lease Losses The reserve for loan and lease loss methodology has been consistently applied for several years, with enhancements instituted periodically. Reserve ratios are reviewed quarterly and revised periodically to reflect recent loss history and to incorporate current risks and trends which may not be recognized in historical data. As the historical charge-off analysis is updated, the Company reviews the look-back periods for each business loan portfolio. Furthermore, a thorough analysis of charge-offs, non-performing asset levels, special attention outstandings and delinquency is performed in order to review portfolio trends and other factors, including specific industry risks and economic conditions, which may have an impact on the reserves and reserve ratios applied to various portfolios. The Company adjusts the calculated historical based ratio as a result of the analysis of environmental factors, principally economic risk and concentration risk. Key economic factors affecting the portfolios are growth in gross domestic product, unemployment rates, housing market trends, commodity prices, inflation and global economic and political issues. Concentration risk is impacted primarily by geographic concentration in Northern Indiana and Southwestern Lower Michigan in the business banking and commercial real estate portfolios and by collateral concentration in the specialty finance portfolios and exposure to foreign markets by geographic risk. The reserve for loan and lease losses is maintained at a level believed to be appropriate by the Company to absorb probable losses inherent in the loan and lease portfolio. The determination of the reserve requires significant judgment reflecting the Company’s best estimate of probable loan and lease losses related to specifically identified impaired loans and leases as well as probable losses in the remainder of the various loan and lease portfolios. For purposes of determining the reserve, the Company has segmented loans and leases into classes based on the associated risk within these segments. The Company has determined that eight classes exist within the loan and lease portfolio. The methodology for assessing the appropriateness of the reserve consists of several key elements, which include: specific reserves for impaired loans, formula reserves for each business lending division portfolio including percentage allocations for special attention loans and leases not deemed impaired, and reserves for pooled homogeneous loans and leases. The Company’s evaluation is based upon a continuing review of these portfolios, estimates of customer performance, collateral values and dispositions, and assessments of economic and geopolitical events, all of which are subject to judgment and will change. The following table shows the changes in the reserve for loan and lease losses, segregated by class, for the three months ended September 30, 2017 and 2016 . (Dollars in thousands) Commercial and agricultural Auto and light truck Medium and heavy duty truck Aircraft Construction Commercial real estate Residential real estate and home equity Consumer Total September 30, 2017 Balance, beginning of period $ 16,199 $ 11,443 $ 4,840 $ 31,822 $ 9,249 $ 13,475 $ 3,607 $ 1,279 $ 91,914 Charge-offs 434 88 — 115 48 342 29 238 1,294 Recoveries 64 13 — 12 243 733 2 65 1,132 Net charge-offs (recoveries) 370 75 — 103 (195 ) (391 ) 27 173 162 Provision (recovery of provision) (91 ) (405 ) (100 ) 1,811 (193 ) 400 28 170 1,620 Balance, end of period $ 15,738 $ 10,963 $ 4,740 $ 33,530 $ 9,251 $ 14,266 $ 3,608 $ 1,276 $ 93,372 September 30, 2016 Balance, beginning of period $ 14,835 $ 11,667 $ 4,350 $ 34,661 $ 7,512 $ 13,462 $ 3,616 $ 1,355 $ 91,458 Charge-offs 206 1 — 4,834 36 31 63 166 5,337 Recoveries 160 65 — 186 172 48 11 67 709 Net charge-offs (recoveries) 46 (64 ) — 4,648 (136 ) (17 ) 52 99 4,628 Provision (recovery of provision) 90 (3,998 ) (72 ) 5,148 286 460 94 59 2,067 Balance, end of period $ 14,879 $ 7,733 $ 4,278 $ 35,161 $ 7,934 $ 13,939 $ 3,658 $ 1,315 $ 88,897 The following table shows the changes in the reserve for loan and lease losses, segregated by class, for the nine months ended September 30, 2017 and 2016 . (Dollars in thousands) Commercial and agricultural loans Auto and light truck Medium and heavy duty truck Aircraft Construction Commercial real estate Residential real estate and home equity Consumer loans Total September 30, 2017 Balance, beginning of period $ 14,668 $ 8,064 $ 4,740 $ 34,352 $ 8,207 $ 13,677 $ 3,550 $ 1,285 $ 88,543 Charge-offs 903 170 — 1,872 75 344 66 608 4,038 Recoveries 748 1,145 — 210 272 831 89 214 3,509 Net charge-offs (recoveries) 155 (975 ) — 1,662 (197 ) (487 ) (23 ) 394 529 Provision (recovery of provision) 1,225 1,924 — 840 847 102 35 385 5,358 Balance, end of period $ 15,738 $ 10,963 $ 4,740 $ 33,530 $ 9,251 $ 14,266 $ 3,608 $ 1,276 $ 93,372 September 30, 2016 Balance, beginning of period $ 15,456 $ 9,269 $ 4,699 $ 32,373 $ 7,592 $ 13,762 $ 3,662 $ 1,299 $ 88,112 Charge-offs 422 4 — 4,834 128 32 192 620 6,232 Recoveries 360 191 10 412 320 388 28 217 1,926 Net charge-offs (recoveries) 62 (187 ) (10 ) 4,422 (192 ) (356 ) 164 403 4,306 Provision (recovery of provision) (515 ) (1,723 ) (431 ) 7,210 150 (179 ) 160 419 5,091 Balance, end of period $ 14,879 $ 7,733 $ 4,278 $ 35,161 $ 7,934 $ 13,939 $ 3,658 $ 1,315 $ 88,897 The following table shows the reserve for loan and lease losses and recorded investment in loans and leases, segregated by class, separated between individually and collectively evaluated for impairment as of September 30, 2017 and December 31, 2016 . (Dollars in thousands) Commercial and agricultural loans Auto and light truck Medium and heavy duty truck Aircraft Construction Commercial real estate Residential real estate and home equity Consumer loans Total September 30, 2017 Reserve for loan and lease losses Ending balance, individually evaluated for impairment $ 444 $ — $ — $ — $ — $ 189 $ 136 $ — $ 769 Ending balance, collectively evaluated for impairment 15,294 10,963 4,740 33,530 9,251 14,077 3,472 1,276 92,603 Total reserve for loan and lease losses $ 15,738 $ 10,963 $ 4,740 $ 33,530 $ 9,251 $ 14,266 $ 3,608 $ 1,276 $ 93,372 Recorded investment in loans Ending balance, individually evaluated for impairment $ 4,458 $ — $ 1,505 $ 2,157 $ 593 $ 3,453 $ 353 $ — $ 12,519 Ending balance, collectively evaluated for impairment 888,716 505,126 286,470 813,963 541,245 736,892 523,718 128,069 4,424,199 Total recorded investment in loans $ 893,174 $ 505,126 $ 287,975 $ 816,120 $ 541,838 $ 740,345 $ 524,071 $ 128,069 $ 4,436,718 December 31, 2016 Reserve for loan and lease losses Ending balance, individually evaluated for impairment $ 297 $ — $ — $ 1,076 $ 35 $ 322 $ 148 $ — $ 1,878 Ending balance, collectively evaluated for impairment 14,371 8,064 4,740 33,276 8,172 13,355 3,402 1,285 86,665 Total reserve for loan and lease losses $ 14,668 $ 8,064 $ 4,740 $ 34,352 $ 8,207 $ 13,677 $ 3,550 $ 1,285 $ 88,543 Recorded investment in loans Ending balance, individually evaluated for impairment $ 3,590 $ 115 $ — $ 6,110 $ 1,167 $ 5,372 $ 674 $ — $ 17,028 Ending balance, collectively evaluated for impairment 808,674 411,649 294,790 796,304 494,758 713,798 521,257 129,813 4,171,043 Total recorded investment in loans $ 812,264 $ 411,764 $ 294,790 $ 802,414 $ 495,925 $ 719,170 $ 521,931 $ 129,813 $ 4,188,071

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 recognizes the rights to service residential mortgage loans for others as separate assets, whether the servicing rights are acquired through a separate purchase or through the sale of originated loans with servicing rights retained. The Company allocates a portion of the total proceeds of a mortgage loan to servicing rights based on the relative fair value. The unpaid principal balance of residential mortgage loans serviced for third parties was $757.12 million and $761.85 million at September 30, 2017 and December 31, 2016 , respectively. Mortgage servicing rights (MSRs) are evaluated for impairment at each reporting date. For purposes of impairment measurement, MSRs are stratified based on the predominant risk characteristics of the underlying servicing, principally by loan type. If temporary impairment exists within a tranche, a valuation allowance is established through a charge to income equal to the amount by which the carrying value exceeds the fair value. If it is later determined all or a portion of the temporary impairment no longer exists for a particular tranche, the valuation allowance is reduced through a recovery of income. The following table shows changes in the carrying value of MSRs and the associated valuation allowance. Three Months Ended Nine Months Ended (Dollars in thousands) 2017 2016 2017 2016 Mortgage servicing rights: Balance at beginning of period $ 4,239 $ 4,339 $ 4,297 $ 4,608 Additions 391 313 884 760 Amortization (270 ) (417 ) (821 ) (1,133 ) Sales — — — — Carrying value before valuation allowance at end of period 4,360 4,235 4,360 4,235 Valuation allowance: Balance at beginning of period — — — — Impairment recoveries — — — — Balance at end of period $ — $ — $ — $ — Net carrying value of mortgage servicing rights at end of period $ 4,360 $ 4,235 $ 4,360 $ 4,235 Fair value of mortgage servicing rights at end of period $ 7,097 $ 5,666 $ 7,097 $ 5,666 At September 30, 2017 and 2016 , the fair value of MSRs exceeded the carrying value reported in the Statements of Financial Condition by $2.74 million and $1.43 million , respectively. This difference represents increases in the fair value of certain MSRs that could not be recorded above cost basis. Mortgage loan contractual servicing fees, including late fees and ancillary income, were $0.67 million and $0.68 million for the three months ended September 30, 2017 and 2016 , respectively. Mortgage loan contractual servicing fees, including late fees and ancillary income, were $2.04 million and $2.04 million for the nine months ended September 30, 2017 and 2016 , respectively. Mortgage loan contractual servicing fees are included in Mortgage Banking on the Statements of Income.

Commitments and Financial Instr

Commitments and Financial Instruments with Off-Balance-Sheet Risk	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Financial Instruments with Off-Balance-Sheet Risk	Commitments and Financial Instruments with Off-Balance-Sheet Risk Commitments — 1st Source Bank (Bank), a subsidiary of 1st Source Corporation, has made investments directly in various tax-advantaged and other operating partnerships formed by third parties.The Bank’s investments are primarily related to investments promoting affordable housing, community development and renewable energy sources. As a limited partner in these operating partnerships, we are allocated credits and deductions associated with the underlying properties. The Bank has determined that it is not the primary beneficiary of these investments because the general partners have the power to direct the activities that most significantly influence the economic performance of their respective partnerships. At September 30, 2017 and December 31, 2016 , investment balances, including all legally binding commitments to fund future investments totaled $23.41 million and $11.14 million , respectively. In addition, the Bank had a liability for all legally binding unfunded commitments of $26.47 million and $4.95 million at September 30, 2017 and December 31, 2016 , respectively. Financial Instruments with Off-Balance-Sheet Risk — 1st Source and its subsidiaries are parties to financial instruments with off-balance-sheet risk in the normal course of business. These off-balance-sheet financial instruments include commitments to originate and sell loans and standby letters of credit. The instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Statements of Financial Condition. The following table shows financial instruments whose contract amounts represent credit risk. (Dollars in thousands) September 30, 2017 December 31, 2016 Amounts of commitments: Loan commitments to extend credit $ 939,797 $ 868,267 Standby letters of credit $ 30,215 $ 33,397 Commercial and similar letters of credit $ 3,172 $ 1,704 The exposure to credit loss in the event of nonperformance by the other party to the financial instruments for loan commitments and standby letters of credit is represented by the dollar amount of those instruments. The Company uses the same credit policies and collateral requirements in making commitments and conditional obligations as it does for on-balance-sheet instruments. The Bank grants mortgage loan commitments to borrowers, subject to normal loan underwriting standards. The interest rate risk associated with these loan commitments is managed by entering into contracts for future deliveries of loans. Loan commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank issues standby letters of credit which are conditional commitments that guarantee the performance of a client to a third party. The credit risk involved in and collateral obtained when issuing standby letters of credit is essentially the same as that involved in extending loan commitments to clients. Standby letters of credit generally have terms ranging from six months to one year. 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 the third party. Commercial letters of credit generally have terms ranging from three months to six months.

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 Commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments. See Note 7 for further information. The Company has certain interest rate derivative positions that are not designated as hedging instruments. Derivative assets and liabilities are recorded at fair value on the balance sheet and do take into account the effects of master netting agreements. Master netting agreements allow the Company to settle all derivative contracts held with a single counterparty on a net basis, and to offset net derivative positions with related collateral, where applicable. These derivative positions relate to transactions in which the Company enters into an interest rate swap with a client while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, the Company agrees to pay interest to the client on a notional amount at a variable interest rate and receive interest from the client on the same notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows the client to effectively convert a variable rate loan to a fixed rate. Because the terms of the swaps with the customers and the other financial institutions offset each other, with the only difference being counterparty credit risk, changes in the fair value of the underlying derivative contracts are not materially different and do not significantly impact the Company’s results of operations. The following table shows the amounts of non-hedging derivative financial instruments. Asset derivatives Liability derivatives (Dollars in thousands) Notional or contractual amount Statement of Financial Condition classification Fair value Statement of Financial Condition classification Fair value September 30, 2017 Interest rate swap contracts $ 621,154 Other assets $ 5,680 Other liabilities $ 5,785 Loan commitments 10,945 Mortgages held for sale 100 N/A — Forward contracts - mortgage loan 19,516 N/A — Mortgages held for sale 4 Total $ 651,615 $ 5,780 $ 5,789 December 31, 2016 Interest rate swap contracts $ 570,004 Other assets $ 6,621 Other liabilities $ 6,743 Loan commitments 5,527 Mortgages held for sale 43 N/A — Forward contracts - mortgage loan 16,525 Mortgages held for sale 222 N/A — Total $ 592,056 $ 6,886 $ 6,743 The following table shows the amounts included in the Statements of Income for non-hedging derivative financial instruments. Gain (loss) Three Months Ended Nine Months Ended (Dollars in thousands) Statement of Income classification 2017 2016 2017 2016 Interest rate swap contracts Other expense $ (3 ) $ 36 $ 17 $ (100 ) Interest rate swap contracts Other income 733 150 944 464 Loan commitments Mortgage banking 20 (105 ) 57 16 Forward contracts - mortgage loan Mortgage banking (31 ) 190 (226 ) (130 ) Total $ 719 $ 271 $ 792 $ 250 The following table shows the offsetting of financial assets and derivative assets. Gross Amounts Not Offset in the Statement of Financial Condition (Dollars in thousands) Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Condition Net Amounts of Assets Presented in the Statement of Financial Condition Financial Instruments Cash Collateral Received Net Amount September 30, 2017 Interest rate swaps $ 5,707 $ 27 $ 5,680 $ — $ — $ 5,680 December 31, 2016 Interest rate swaps $ 6,681 $ 60 $ 6,621 $ — $ — $ 6,621 The following table shows the offsetting of financial liabilities and derivative liabilities. Gross Amounts Not Offset in the Statement of Financial Condition (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Condition Net Amounts of Liabilities Presented in the Statement of Financial Condition Financial Instruments Cash Collateral Pledged Net Amount September 30, 2017 Interest rate swaps $ 5,812 $ 27 $ 5,785 $ — $ 5,206 $ 579 Repurchase agreements 148,001 — 148,001 148,001 — — Total $ 153,813 $ 27 $ 153,786 $ 148,001 $ 5,206 $ 579 December 31, 2016 Interest rate swaps $ 6,803 $ 60 $ 6,743 $ — $ 3,794 $ 2,949 Repurchase agreements 162,913 — 162,913 162,913 — — Total $ 169,716 $ 60 $ 169,656 $ 162,913 $ 3,794 $ 2,949 If a default in performance of any obligation of a repurchase agreement occurs, each party will set-off property held in respect of transactions against obligations owing in respect of any other transactions. At September 30, 2017 and December 31, 2016 , repurchase agreements had a remaining contractual maturity of $146.37 million and $160.38 million in overnight, $1.33 million and $2.23 million in up to 30 days, and $0.30 million and $0.30 million in greater than 90 days, respectively and were collateralized by U.S. Treasury and Federal agencies securities.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards. Non-vested restricted stock awards are considered participating securities to the extent the holders of these securities receive non-forfeitable dividends at the same rate as holders of common stock. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method. Stock options, where the exercise price was greater than the average market price of the common shares, were excluded from the computation of diluted earnings per common share because the result would have been antidilutive. There were no stock options outstanding as of September 30, 2017 and 2016 . The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share. Three Months Ended Nine Months Ended (Dollars in thousands - except per share amounts) 2017 2016 2017 2016 Distributed earnings allocated to common stock $ 4,928 $ 4,656 $ 14,514 $ 13,995 Undistributed earnings allocated to common stock 12,122 9,515 35,162 28,260 Net earnings allocated to common stock 17,050 14,171 49,676 42,255 Net earnings allocated to participating securities 132 93 381 306 Net income allocated to common stock and participating securities $ 17,182 $ 14,264 $ 50,057 $ 42,561 Weighted average shares outstanding for basic earnings per common share 25,935,867 25,867,169 25,922,218 25,881,360 Dilutive effect of stock compensation — — — — Weighted average shares outstanding for diluted earnings per common share 25,935,867 25,867,169 25,922,218 25,881,360 Basic earnings per common share $ 0.66 $ 0.55 $ 1.92 $ 1.63 Diluted earnings per common share $ 0.66 $ 0.55 $ 1.92 $ 1.63

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation As of September 30, 2017 , the Company had four active stock-based employee compensation plans, which are more fully described in Note 16 of the Consolidated Financial Statements in 1st Source’s Annual Report on Form 10-K for the year ended December 31, 2016 . These plans include three executive stock award plans, the Executive Incentive Plan, the Restricted Stock Award Plan, the Strategic Deployment Incentive Plan; and the Employee Stock Purchase Plan. The 2011 Stock Option Plan was approved by the shareholders on April 21, 2011 but the Company had not made any grants through September 30, 2017 . Stock-based compensation expense for all stock-based compensation awards granted is based on the grant-date fair value. For all awards except stock option awards, the grant date fair value is either the fair market value per share or book value per share (corresponding to the type of stock awarded) as of the grant date. For stock option awards, the grant date fair value is estimated using the Black-Scholes option pricing model. For all awards the Company recognizes these compensation costs on a straight-line basis over the requisite service period of the award, for which the Company uses the related vesting term. The stock based compensation expense recognized in the Statements of Income for the three and nine months ended September 30, 2016 was based on awards ultimately expected to vest, and accordingly had been adjusted by the amount of forfeitures. The Company adopted Accounting Standards Update No. 2016-09, on January 1, 2017, that allows for forfeitures to be recorded as they occur. The adoption of this standard required an immaterial cumulative effect adjustment to retained earnings as prior to January 1, 2017 forfeitures had been estimated based partially on historical experience. Total fair value of options vested and expensed was zero for the nine months ended September 30, 2017 and 2016 . As of September 30, 2017 and 2016 there were no outstanding stock options. There were no stock options exercised during the nine months ended September 30, 2017 and 2016 . All shares issued in connection with stock option exercises are issued from available treasury stock. As of September 30, 2017 , there was $6.40 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements. That cost is expected to be recognized over a weighted-average period of 3.29 years.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents reclassifications out of accumulated other comprehensive income related to unrealized gains and losses on available-for-sale securities. Three Months Ended Nine Months Ended Affected Line Item in the Statements of Income (Dollars in thousands) 2017 2016 2017 2016 Realized gains included in net income $ 1,007 $ 989 $ 2,757 $ 790 Gains on investment securities available-for-sale 1,007 989 2,757 790 Income before income taxes Tax effect (378 ) (371 ) (1,035 ) (296 ) Income tax expense Net of tax $ 629 $ 618 $ 1,722 $ 494 Net income

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The total amount of unrecognized tax benefits that would affect the effective tax rate if recognized was $0.64 million at September 30, 2017 and $0.50 million at December 31, 2016 . Interest and penalties are recognized through the income tax provision. For the nine months ended September 30, 2017 and 2016 , the Company recognized $0.05 million and $0.04 million in interest or penalties, respectively. There was $0.09 million and $0.04 million in accrued interest and penalties at September 30, 2017 and December 31, 2016 , respectively. Tax years that remain open and subject to audit include the federal 2014-2016 years and the Indiana 2013-2016 years. The Company does not anticipate a significant change in the amount of uncertain tax positions within the next 12 months.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company records certain assets and liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are also utilized to determine the initial value of certain assets and liabilities, to perform impairment assessments, and for disclosure purposes. The Company uses quoted market prices and observable inputs to the maximum extent possible when measuring fair value. In the absence of quoted market prices, various valuation techniques are utilized to measure fair value. When possible, observable market data for identical or similar financial instruments is used in the valuation. When market data is not available, fair value is determined using valuation models that incorporate management’s estimates of the assumptions a market participant would use in pricing the asset or liability. Fair value measurements are classified within one of three levels based on the observability of the inputs used to determine fair value, as follows: • Level 1 — The valuation is based on quoted prices in active markets for identical instruments. • Level 2 — The valuation is based on observable inputs such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3 — The valuation is based on unobservable inputs that are supported by minimal or no market activity and that are significant to the fair value of the instrument. Level 3 valuations are typically performed using pricing models, discounted cash flow methodologies, or similar techniques that incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument, or valuations that require significant management judgment or estimation. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company elected fair value accounting for mortgages held for sale. The Company believes the election for mortgages held for sale (which are economically hedged with free standing derivatives) will reduce certain timing differences and better match changes in the value of these assets with changes in the value of derivatives used as economic hedges for these assets. At September 30, 2017 and December 31, 2016 , all mortgages held for sale were carried at fair value. The following table shows the differences between the fair value carrying amount of mortgages held for sale measured at fair value and the aggregate unpaid principal amount the Company is contractually entitled to receive at maturity. (Dollars in thousands) Fair value carrying amount Aggregate unpaid principal Excess of fair value carrying amount over (under) unpaid principal September 30, 2017 Mortgages held for sale reported at fair value $ 11,000 $ 10,788 $ 212 (1) December 31, 2016 Mortgages held for sale reported at fair value $ 15,849 $ 15,809 $ 40 (1) (1) The excess of fair value carrying amount over (under) unpaid principal is included in mortgage banking income and includes changes in fair value at and subsequent to funding and gains and losses on the related loan commitment prior to funding. Financial Instruments on Recurring Basis: The following is a description of the valuation methodologies used for financial instruments measured at fair value on a recurring basis: Investment securities available for sale are valued primarily by a third party pricing agent. Prices supplied by the independent pricing agent, as well as their pricing methodologies and assumptions, are reviewed by the Company for reasonableness and to ensure such prices are aligned with market levels. In general, the Company’s investment securities do not possess a complex structure that could introduce greater valuation risk. The portfolio mainly consists of traditional investments including U.S. Treasury and Federal agencies securities, federal agency mortgage pass-through securities, and general obligation and revenue municipal bonds. Pricing for such instruments is fairly generic and is easily obtained. On a quarterly basis, prices supplied by the pricing agent are validated by comparison to prices obtained from other third party sources for a material portion of the portfolio. The valuation policy and procedures for Level 3 fair value measurements of available for sale debt securities are decided through collaboration between management of the Corporate Accounting and Funds Management departments. The changes in fair value measurement for Level 3 securities are analyzed on a periodic basis under a collaborative framework with the aforementioned departments. The methodology and variables used for input are derived from the combination of observable and unobservable inputs. The unobservable inputs are determined through internal assumptions that may vary from period to period due to external factors, such as market movement and credit rating adjustments. Both the market and income valuation approaches are implemented using the following types of inputs: • U.S. treasuries are priced using the market approach and utilizing live data feeds from active market exchanges for identical securities. • Government-sponsored agency debt securities and corporate bonds are primarily priced using available market information through processes such as benchmark curves, market valuations of like securities, sector groupings and matrix pricing. • Other government-sponsored agency securities, mortgage-backed securities and some of the actively traded REMICs and CMOs, are primarily priced using available market information including benchmark yields, prepayment speeds, spreads and volatility of similar securities. • Inactively traded government-sponsored agency securities are primarily priced using consensus pricing and dealer quotes. • State and political subdivisions are largely grouped by characteristics, i.e., geographical data and source of revenue in trade dissemination systems. Since some securities are not traded daily and due to other grouping limitations, active market quotes are often obtained using benchmarking for like securities. Local direct placement municipal securities, with very little market activity, are priced using an appropriate market yield curve, which includes a credit spread assumption. • Marketable equity (common) securities are primarily priced using the market approach and utilizing live data feeds from active market exchanges for identical securities. Mortgages held for sale and the related loan commitments and forward contracts (hedges) are valued using a market value approach and utilizing an appropriate current market yield and a loan commitment closing rate based on historical analysis. Interest rate swap positions, both assets and liabilities, are valued by a third party pricing agent using an income approach and utilizing models that use as their basis readily observable market parameters. This valuation process considers various factors including interest rate yield curves, time value and volatility factors. Validation of third party agent valuations is accomplished by comparing those values to the Company’s swap counterparty valuations. Management believes an adjustment is required to “mid-market” valuations for derivatives tied to its performing loan portfolio to recognize the imprecision and related exposure inherent in the process of estimating expected credit losses as well as velocity of deterioration evident with systemic risks embedded in these portfolios. The following table shows the balance of assets and liabilities measured at fair value on a recurring basis. (Dollars in thousands) Level 1 Level 2 Level 3 Total September 30, 2017 Assets: Investment securities available-for-sale: U.S. Treasury and Federal agencies securities $ 20,233 $ 437,393 $ — $ 457,626 U.S. States and political subdivisions securities — 120,158 2,968 123,126 Mortgage-backed securities — Federal agencies — 276,857 — 276,857 Corporate debt securities — 31,479 — 31,479 Foreign government and other securities — — 202 202 Total debt securities 20,233 865,887 3,170 889,290 Marketable equity securities 4,683 — — 4,683 Total investment securities available-for-sale 24,916 865,887 3,170 893,973 Mortgages held for sale — 11,000 — 11,000 Accrued income and other assets (interest rate swap agreements) — 5,680 — 5,680 Total $ 24,916 $ 882,567 $ 3,170 $ 910,653 Liabilities: Accrued expenses and other liabilities (interest rate swap agreements) $ — $ 5,785 $ — $ 5,785 Total $ — $ 5,785 $ — $ 5,785 December 31, 2016 Assets: Investment securities available-for-sale: U.S. Treasury and Federal agencies securities $ 20,164 $ 400,669 $ — $ 420,833 U.S. States and political subdivisions securities — 130,276 2,699 132,975 Mortgage-backed securities — Federal agencies — 252,574 — 252,574 Corporate debt securities — 35,076 — 35,076 Foreign government and other securities — — 807 807 Total debt securities 20,164 818,595 3,506 842,265 Marketable equity securities 8,202 — — 8,202 Total investment securities available-for-sale 28,366 818,595 3,506 850,467 Mortgages held for sale — 15,849 — 15,849 Accrued income and other assets (interest rate swap agreements) — 6,621 — 6,621 Total $ 28,366 $ 841,065 $ 3,506 $ 872,937 Liabilities: Accrued expenses and other liabilities (interest rate swap agreements) $ — $ 6,743 $ — $ 6,743 Total $ — $ 6,743 $ — $ 6,743 The following table shows changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended September 30, 2017 and 2016 . (Dollars in thousands) U.S. States and political subdivisions securities Foreign government and other securities Investment securities available-for-sale Beginning balance July 1, 2017 $ 1,801 $ 302 $ 2,103 Total gains or losses (realized/unrealized): Included in earnings — — — Included in other comprehensive income 17 — 17 Purchases 1,150 — 1,150 Issuances — — — Sales — — — Settlements — — — Maturities — (100 ) (100 ) Transfers into Level 3 — — — Transfers out of Level 3 — — — Ending balance September 30, 2017 $ 2,968 $ 202 $ 3,170 Beginning balance July 1, 2016 $ 4,661 $ 810 $ 5,471 Total gains or losses (realized/unrealized): Included in earnings — — — Included in other comprehensive income (16 ) — (16 ) Purchases — — — Issuances — — — Sales — — — Settlements — — — Maturities (662 ) — (662 ) Transfers into Level 3 — — — Transfers out of Level 3 — — — Ending balance September 30, 2016 $ 3,983 $ 810 $ 4,793 There were no gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at September 30, 2017 or 2016 . No transfers between levels occurred during the three months ended September 30, 2017 or 2016 . The following table shows the valuation methodology and unobservable inputs for Level 3 assets and liabilities measured at fair value on a recurring basis. (Dollars in thousands) Fair Value Valuation Methodology Unobservable Inputs Range of Inputs September 30, 2017 Investment securities available-for sale Direct placement municipal securities $ 2,968 Discounted cash flows Credit spread assumption 1.74% - 2.64% Foreign government $ 202 Discounted cash flows Market yield assumption 0.50% - 0.61% December 31, 2016 Investment securities available-for sale Direct placement municipal securities $ 2,699 Discounted cash flows Credit spread assumption 0.92% - 3.17% Foreign government $ 807 Discounted cash flows Market yield assumption 0.28% - 1.12% The sensitivity to changes in the unobservable inputs and their impact on the fair value measurement can be significant. The significant unobservable input for direct placement municipal securities are the credit spread assumptions used to determine the fair value measure. An increase (decrease) in the estimated spread assumption of the market will decrease (increase) the fair value measure of the securities. The significant unobservable input for foreign government securities are the market yield assumptions. The market yield assumption is negatively correlated to the fair value measure. An increase (decrease) in the determined market yield assumption will decrease (increase) the fair value measurement. Financial Instruments on Non-recurring Basis: The Company may be required, from time to time, to measure certain other financial assets at fair value on a non-recurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower of cost or market accounting or impairment charges of individual assets. The Credit Policy Committee (CPC), a management committee, is responsible for overseeing the valuation processes and procedures for Level 3 measurements of impaired loans, other real estate and repossessions. The CPC reviews these assets on a quarterly basis to determine the accuracy of the observable inputs, generally third party appraisals, auction values, values derived from trade publications and data submitted by the borrower, and the appropriateness of the unobservable inputs, generally discounts due to current market conditions and collection issues. The CPC establishes discounts based on asset type and valuation source; deviations from the standard are documented. The discounts are reviewed periodically, annually at a minimum, to determine they remain appropriate. Consideration is given to current trends in market values for the asset categories and gains and losses on sales of similar assets. The Loan and Funds Management Committee of the Board of Directors is responsible for overseeing the CPC. Discounts vary depending on the nature of the assets and the source of value. Aircraft are generally valued using quarterly trade publications adjusted for engine time, condition, maintenance programs, discounted by 10% . Likewise, autos are valued using current auction values, discounted by 10% ; medium and heavy duty trucks are valued using trade publications and auction values, discounted by 15% . Construction equipment is generally valued using trade publications and auction values, discounted by 20% . Real estate is valued based on appraisals or evaluations, discounted by 20% with higher discounts for property in poor condition or property with characteristics which may make it more difficult to market. Commercial loans subject to borrowing base certificates are generally discounted by 20% for receivables and 40% - 75% for inventory with higher discounts when monthly borrowing base certificates are not required or received. Impaired loans and related write-downs are based on the fair value of the underlying collateral if repayment is expected solely from the collateral. Collateral values are reviewed quarterly and estimated using customized discounting criteria, appraisals and dealer and trade magazine quotes which are used in a market valuation approach. In accordance with fair value measurements, only impaired loans for which a reserve for loan loss has been established based on the fair value of collateral require classification in the fair value hierarchy. As a result, only a portion of the Company’s impaired loans are classified in the fair value hierarchy. Partnership investments and the adjustments to fair value primarily result from application of lower of cost or fair value accounting. The partnership investments are priced using financial statements provided by the partnerships. Quantitative unobservable inputs are not reasonably available for reporting purposes. The Company has established MSRs valuation policies and procedures based on industry standards and to ensure valuation methodologies are consistent and verifiable. MSRs and related adjustments to fair value result from application of lower of cost or fair value accounting. For purposes of impairment, MSRs are stratified based on the predominant risk characteristics of the underlying servicing, principally by loan type. The fair value of each tranche of the servicing portfolio is estimated by calculating the present value of estimated future net servicing cash flows, taking into consideration actual and expected mortgage loan prepayment rates, discount rates, servicing costs, and other economic factors. Prepayment rates and discount rates are derived through a third party pricing agent. Changes in the most significant inputs, including prepayment rates and discount rates, are compared to the changes in the fair value measurements and appropriate resolution is made. A fair value analysis is also obtained from an independent third party agent and compared to the internal valuation for reasonableness. MSRs do not trade in an active, open market with readily observable prices and though sales of MSRs do occur, precise terms and conditions typically are not readily available and the characteristics of the Company’s servicing portfolio may differ from those of any servicing portfolios that do trade. Other real estate is based on the lower of cost or fair value of the underlying collateral less expected selling costs. Collateral values are estimated primarily using appraisals and reflect a market value approach. Fair values are reviewed quarterly and new appraisals are obtained annually. Repossessions are similarly valued. For assets measured at fair value on a nonrecurring basis the following represents impairment charges (recoveries) recognized on these assets during the quarter ended September 30, 2017 : impaired loans - $0.24 million ; partnership investments - $0.00 million ; mortgage servicing rights - $0.00 million ; repossessions - $0.49 million ; and other real estate - $0.00 million . The following table shows the carrying value of assets measured at fair value on a non-recurring basis. (Dollars in thousands) Level 1 Level 2 Level 3 Total September 30, 2017 Impaired loans - collateral based $ — $ — $ 3,841 $ 3,841 Accrued income and other assets (partnership investments) — — 1,033 1,033 Accrued income and other assets (mortgage servicing rights) — — 4,360 4,360 Accrued income and other assets (repossessions) — — 12,913 12,913 Accrued income and other assets (other real estate) — — 1,341 1,341 Total $ — $ — $ 23,488 $ 23,488 December 31, 2016 Impaired loans - collateral based $ — $ — $ 6,280 $ 6,280 Accrued income and other assets (partnership investments) — — 1,032 1,032 Accrued income and other assets (mortgage servicing rights) — — 4,297 4,297 Accrued income and other assets (repossessions) — — 9,373 9,373 Accrued income and other assets (other real estate) — — 704 704 Total $ — $ — $ 21,686 $ 21,686 The following table below shows the valuation methodology and unobservable inputs for Level 3 assets and liabilities measured at fair value on a non-recurring basis. (Dollars in thousands) Carrying Value Fair Value Valuation Methodology Unobservable Inputs Range of Inputs September 30, 2017 Impaired loans $ 3,841 $ 3,841 Collateral based measurements including appraisals, trade publications, and auction values Discount for lack of marketability and current conditions 15% - 20% Mortgage servicing rights 4,360 7,097 Discounted cash flows Constant prepayment rate (CPR) 9.1% - 18.8% Discount rate 9.5% - 12.4% Repossessions 12,913 13,410 Appraisals, trade publications and auction values Discount for lack of marketability 3% - 10% Other real estate 1,341 1,401 Appraisals Discount for lack of marketability 0% - 10% December 31, 2016 Impaired loans $ 6,280 $ 6,280 Collateral based measurements including appraisals, trade publications, and auction values Discount for lack of marketability and current conditions 0% - 100% Mortgage servicing rights 4,297 7,484 Discounted cash flows Constant prepayment rate (CPR) 8.6% - 15.0% Discount rate 9.6% - 12.5% Repossessions 9,373 9,452 Appraisals, trade publications and auction values Discount for lack of marketability 0% - 4% Other real estate 704 752 Appraisals Discount for lack of marketability 0% - 16% GAAP requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring or non-recurring basis. The following table shows the fair values of the Company’s financial instruments. (Dollars in thousands) Carrying or Contract Value Fair Value Level 1 Level 2 Level 3 September 30, 2017 Assets: Cash and due from banks $ 64,636 $ 64,636 $ 64,636 $ — $ — Federal funds sold and interest bearing deposits with other banks 34,788 34,788 34,788 — — Investment securities, available-for-sale 893,973 893,973 24,916 865,887 3,170 Other investments 25,953 25,953 25,953 — — Mortgages held for sale 11,000 11,000 — 11,000 — Loans and leases, net of reserve for loan and lease losses 4,343,346 4,343,808 — — 4,343,808 Mortgage servicing rights 4,360 7,097 — — 7,097 Interest rate swaps 5,680 5,680 — 5,680 — Liabilities: Deposits $ 4,573,712 $ 4,571,242 $ 3,337,440 $ 1,233,802 $ — Short-term borrowings 316,765 316,765 148,771 167,994 — Long-term debt and mandatorily redeemable securities 70,482 69,221 — 69,221 — Subordinated notes 58,764 56,048 — 56,048 — Interest rate swaps 5,785 5,785 — 5,785 — Off-balance-sheet instruments * — 300 — 300 — December 31, 2016 Assets: Cash and due from banks $ 58,578 $ 58,578 $ 58,578 $ — $ — Federal funds sold and interest bearing deposits with other banks 49,726 49,726 49,726 — — Investment securities, available-for-sale 850,467 850,467 28,366 818,595 3,506 Other investments 22,458 22,458 22,458 — — Mortgages held for sale 15,849 15,849 — 15,849 — Loans and leases, net of reserve for loan and lease losses 4,099,528 4,107,079 — — 4,107,079 Mortgage servicing rights 4,297 7,484 — — 7,484 Interest rate swaps 6,621 6,621 — 6,621 — Liabilities: Deposits $ 4,333,760 $ 4,332,744 $ 3,277,108 $ 1,055,636 $ — Short-term borrowings 291,943 291,943 163,652 128,291 — Long-term debt and mandatorily redeemable securities 74,308 73,149 — 73,149 — Subordinated notes 58,764 51,031 — 51,031 — Interest rate swaps 6,743 6,743 — 6,743 — Off-balance-sheet instruments * — 382 — 382 — * Represents estimated cash outflows required to currently settle the obligations at current market rates. The methodologies for estimating fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The estimated fair value approximates carrying value for cash and due from banks, federal funds sold and interest bearing deposits with other banks and other investments. The methodologies for other financial assets and financial liabilities are discussed below: Loans and Leases — For variable rate loans and leases that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. The fair values of other loans and leases are estimated using discounted cash flow analyses which use interest rates currently being offered for loans and leases with similar terms to borrowers of similar credit quality. Deposits — The fair values for all deposits other than time deposits are equal to the amounts payable on demand (the carrying value). Fair values of variable rate time deposits are equal to their carrying values. Fair values for fixed rate time deposits are estimated using discounted cash flow analyses using interest rates currently being offered for deposits with similar remaining maturities. Short-Term Borrowings — The carrying values of Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings, including the liability related to mortgage loans available for repurchase under GNMA optional repurchase programs, approximate their fair values. Long-Term Debt and Mandatorily Redeemable Securities — The fair values of long-term debt are estimated using discounted cash flow analyses, based on the current estimated incremental borrowing rates for similar types of borrowing arrangements. The carrying values of mandatorily redeemable securities are based on the current estimated cost of redeeming these securities which approximate their fair values. Subordinated Notes — Fair values are estimated based on calculated market prices of comparable securities. Off-Balance-Sheet Instruments — Contract and fair values for certain off-balance-sheet financial instruments (guarantees) are estimated based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. Limitations — Fair value estimates are made at a specific point in time based on relevant market information and information about the financial instruments. Because no market exists for a significant portion of the financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other such factors. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. These estimates are subjective in nature and require considerable judgment to interpret market data. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize in a current market exchange, nor are they intended to represent the fair value of the Company as a whole. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. The fair value estimates presented herein are based on pertinent information available to management as of the respective balance sheet date. Although the Company is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. Other significant assets, such as premises and equipment, other assets, and liabilities not defined as financial instruments, are not included in the above disclosures. Also, the fair value estimates for deposits do not include the benefit that results from the low-cost funding provided by the deposit liabilities compared to the cost of borrowing funds in the market.

Accounting Policies (Policies)

Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation – The accompanying unaudited consolidated financial statements reflect all adjustments (all of which are normal and recurring in nature) which are, in the opinion of management, necessary for a fair presentation of the consolidated financial position, the results of operations, changes in comprehensive income, changes in shareholders’ equity, and cash flows for the periods presented. These unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission (SEC) and, therefore, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP) have been omitted. The Notes to the Consolidated Financial Statements appearing in 1st Source Corporation’s Annual Report on Form 10-K (2016 Annual Report), which include descriptions of significant accounting policies, should be read in conjunction with these interim financial statements. The Consolidated Statement of Financial Condition at December 31, 2016 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. Certain amounts in the prior period consolidated financial statements have been reclassified to conform to the current year presentation.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements – Financial statements prepared in accordance with GAAP require the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expense during the reporting period. Actual results could differ from those estimates.
Loans and Leases	Loans and Leases – Loans are stated at the principal amount outstanding, net of unamortized deferred loan origination fees and costs and net of unearned income. Interest income is accrued as earned based on unpaid principal balances. Origination fees and direct loan and lease origination costs are deferred and the net amount amortized to interest income over the estimated life of the related loan or lease. Loan commitment fees are deferred and amortized into other income over the commitment period. Direct financing leases are carried at the aggregate of lease payments plus estimated residual value of the leased property, net of unamortized deferred lease origination fees and costs and unearned income. Interest income on direct financing leases is recognized over the term of the lease to achieve a constant periodic rate of return on the outstanding investment. The accrual of interest on loans and leases is discontinued when a loan or lease becomes contractually delinquent for 90 days, or when an individual analysis of a borrower’s credit worthiness indicates a credit should be placed on nonperforming status, except for residential mortgage loans and consumer loans that are well secured and in the process of collection. Residential mortgage loans are placed on nonaccrual at the time the loan is placed in foreclosure. When interest accruals are discontinued, interest credited to income in the current year is reversed and interest accrued in the prior year is charged to the reserve for loan and lease losses. However, in some cases, the Company may elect to continue the accrual of interest when the net realizable value of collateral is sufficient to cover the principal and accrued interest. When a loan or lease is classified as nonaccrual and the future collectibility of the recorded loan or lease balance is doubtful, collections on interest and principal are applied as a reduction to principal outstanding. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured, which is typically evidenced by a sustained repayment performance of at least six months . A loan or lease is considered impaired, based on current information and events, if it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan or lease agreement. Interest on impaired loans and leases, which are not classified as nonaccrual, is recognized on the accrual basis. The Company evaluates loans and leases exceeding $100,000 for impairment and establishes a specific reserve as a component of the reserve for loan and lease losses when it is probable all amounts due will not be collected pursuant to the contractual terms of the loan or lease and the recorded investment in the loan or lease exceeds its fair value. Loans and leases that have been modified and economic concessions have been granted to borrowers who have experienced financial difficulties are considered a troubled debt restructuring (TDR) and, by definition, are deemed an impaired loan. These concessions typically result from the Company’s loss mitigation activities and may include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. Certain TDRs are classified as nonperforming at the time of restructuring and typically are returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period of at least six months. When the Company modifies loans and leases in a TDR, it evaluates any possible impairment similar to other impaired loans based on the present value of expected future cash flows, discounted at the contractual interest rate of the original loan or lease agreement, or uses the current fair value of the collateral, less selling costs for collateral dependent loans. If the Company determines that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premium or discount), impairment is recognized through a reserve for loan and lease losses estimate or a charge-off to the reserve for loan and lease losses. In periods subsequent to modification, the Company evaluates all TDRs, including those that have payment defaults, for possible impairment and recognizes impairment through the reserve for loan and lease losses.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule of investment securities available-for-sale	The following table shows investment securities available-for-sale. (Dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value September 30, 2017 U.S. Treasury and Federal agencies securities $ 460,282 $ 453 $ (3,109 ) $ 457,626 U.S. States and political subdivisions securities 122,178 1,407 (459 ) 123,126 Mortgage-backed securities — Federal agencies 276,791 1,989 (1,923 ) 276,857 Corporate debt securities 31,599 48 (168 ) 31,479 Foreign government and other securities 200 2 — 202 Total debt securities 891,050 3,899 (5,659 ) 889,290 Marketable equity securities 598 4,098 (13 ) 4,683 Total investment securities available-for-sale $ 891,648 $ 7,997 $ (5,672 ) $ 893,973 December 31, 2016 U.S. Treasury and Federal agencies securities $ 424,495 $ 809 $ (4,471 ) $ 420,833 U.S. States and political subdivisions securities 133,509 1,036 (1,570 ) 132,975 Mortgage-backed securities — Federal agencies 252,981 2,175 (2,582 ) 252,574 Corporate debt securities 35,266 111 (301 ) 35,076 Foreign government and other securities 800 7 — 807 Total debt securities 847,051 4,138 (8,924 ) 842,265 Marketable equity securities 1,265 7,007 (70 ) 8,202 Total investment securities available-for-sale $ 848,316 $ 11,145 $ (8,994 ) $ 850,467
Schedule of contractual maturities of investments in debt securities available-for-sale	The following table shows the contractual maturities of investments in debt securities available-for-sale at September 30, 2017 . Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. (Dollars in thousands) Amortized Cost Fair Value Due in one year or less $ 119,304 $ 119,624 Due after one year through five years 448,884 446,985 Due after five years through ten years 46,071 45,824 Due after ten years — — Mortgage-backed securities 276,791 276,857 Total debt securities available-for-sale $ 891,050 $ 889,290
Schedule of gross unrealized losses and fair value by investment category and age	The following table summarizes gross unrealized losses and fair value by investment category and age. Less than 12 Months 12 months or Longer Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2017 U.S. Treasury and Federal agencies securities $ 238,505 $ (1,482 ) $ 97,156 $ (1,627 ) $ 335,661 $ (3,109 ) U.S. States and political subdivisions securities 17,119 (107 ) 22,213 (352 ) 39,332 (459 ) Mortgage-backed securities - Federal agencies 108,863 (1,043 ) 59,233 (880 ) 168,096 (1,923 ) Corporate debt securities 9,789 (13 ) 8,134 (155 ) 17,923 (168 ) Foreign government and other securities — — — — — — Total debt securities 374,276 (2,645 ) 186,736 (3,014 ) 561,012 (5,659 ) Marketable equity securities 149 (12 ) 3 (1 ) 152 (13 ) Total investment securities available-for-sale $ 374,425 $ (2,657 ) $ 186,739 $ (3,015 ) $ 561,164 $ (5,672 ) December 31, 2016 U.S. Treasury and Federal agencies securities $ 263,680 $ (4,471 ) $ — $ — $ 263,680 $ (4,471 ) U.S. States and political subdivisions securities 74,129 (1,515 ) 3,337 (55 ) 77,466 (1,570 ) Mortgage-backed securities - Federal agencies 168,554 (2,341 ) 5,102 (241 ) 173,656 (2,582 ) Corporate debt securities 13,312 (301 ) — — 13,312 (301 ) Foreign government and other securities — — — — — — Total debt securities 519,675 (8,628 ) 8,439 (296 ) 528,114 (8,924 ) Marketable equity securities 280 (70 ) 4 — 284 (70 ) Total investment securities available-for-sale $ 519,955 $ (8,698 ) $ 8,443 $ (296 ) $ 528,398 $ (8,994 )
Schedule of gross realized gains and losses from securities available-for-sale portfolio	The following table shows the gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses of all securities are computed using the specific identification cost basis. Three Months Ended Nine Months Ended (Dollars in thousands) 2017 2016 2017 2016 Gross realized gains $ 1,007 $ 989 $ 2,947 $ 1,084 Gross realized losses — — — — OTTI losses — — (190 ) (294 ) Net realized gains (losses) $ 1,007 $ 989 $ 2,757 $ 790

Loan and Lease Financings (Tabl

Loan and Lease Financings (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Schedule of credit quality grades of the recorded investment in loans and leases, segregated by class	The following table shows the credit quality grades of the recorded investment in loans and leases, segregated by class. Credit Quality Grades (Dollars in thousands) 1-6 7-12 Total September 30, 2017 Commercial and agricultural $ 869,111 $ 24,063 $ 893,174 Auto and light truck 490,765 14,361 505,126 Medium and heavy duty truck 282,200 5,775 287,975 Aircraft 794,533 21,587 816,120 Construction equipment 529,910 11,928 541,838 Commercial real estate 728,331 12,014 740,345 Total $ 3,694,850 $ 89,728 $ 3,784,578 December 31, 2016 Commercial and agricultural $ 784,811 $ 27,453 $ 812,264 Auto and light truck 407,931 3,833 411,764 Medium and heavy duty truck 291,558 3,232 294,790 Aircraft 772,802 29,612 802,414 Construction equipment 486,923 9,002 495,925 Commercial real estate 707,252 11,918 719,170 Total $ 3,451,277 $ 85,050 $ 3,536,327
Schedule of recorded investment in residential real estate and home equity and consumer loans by performing or nonperforming status	The following table shows the recorded investment in residential real estate and home equity and consumer loans by performing or nonperforming status. Nonperforming loans are those loans which are on nonaccrual status or are 90 days or more past due. (Dollars in thousands) Performing Nonperforming Total September 30, 2017 Residential real estate and home equity $ 521,928 $ 2,143 $ 524,071 Consumer 127,881 188 128,069 Total $ 649,809 $ 2,331 $ 652,140 December 31, 2016 Residential real estate and home equity $ 518,896 $ 3,035 $ 521,931 Consumer 129,585 228 129,813 Total $ 648,481 $ 3,263 $ 651,744
Schedule of recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status	The following table shows the recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status. (Dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due and Accruing Total Accruing Loans Nonaccrual Total Financing Receivables September 30, 2017 Commercial and agricultural $ 888,356 $ 80 $ 31 $ — $ 888,467 $ 4,707 $ 893,174 Auto and light truck 502,339 489 34 — 502,862 2,264 505,126 Medium and heavy duty truck 287,975 — — — 287,975 — 287,975 Aircraft 805,389 8,503 — — 813,892 2,228 816,120 Construction equipment 541,279 367 — — 541,646 192 541,838 Commercial real estate 736,682 111 — — 736,793 3,552 740,345 Residential real estate and home equity 520,741 438 749 192 522,120 1,951 524,071 Consumer 127,240 502 139 16 127,897 172 128,069 Total $ 4,410,001 $ 10,490 $ 953 $ 208 $ 4,421,652 $ 15,066 $ 4,436,718 December 31, 2016 Commercial and agricultural $ 808,283 $ — $ — $ — $ 808,283 $ 3,981 $ 812,264 Auto and light truck 411,300 298 — — 411,598 166 411,764 Medium and heavy duty truck 294,790 — — — 294,790 — 294,790 Aircraft 791,559 1,429 3,316 — 796,304 6,110 802,414 Construction equipment 493,131 1,546 — — 494,677 1,248 495,925 Commercial real estate 713,482 133 — — 713,615 5,555 719,170 Residential real estate and home equity 517,212 1,310 374 394 519,290 2,641 521,931 Consumer 129,000 453 132 22 129,607 206 129,813 Total $ 4,158,757 $ 5,169 $ 3,822 $ 416 $ 4,168,164 $ 19,907 $ 4,188,071
Schedule of impaired loans and leases, segregated by class, and the corresponding reserve for impaired loan and lease losses	The following table shows impaired loans and leases, segregated by class, and the corresponding reserve for impaired loan and lease losses. (Dollars in thousands) Recorded Investment Unpaid Principal Balance Related Reserve September 30, 2017 With no related reserve recorded: Commercial and agricultural $ 392 $ 392 $ — Auto and light truck — — — Medium and heavy duty truck 1,505 1,505 — Aircraft 2,157 2,157 — Construction equipment 593 593 — Commercial real estate 2,451 2,451 — Residential real estate and home equity — — — Consumer — — — Total with no related reserve recorded 7,098 7,098 — With a reserve recorded: Commercial and agricultural 4,066 4,066 444 Auto and light truck — — — Medium and heavy duty truck — — — Aircraft — — — Construction equipment — — — Commercial real estate 1,002 1,002 189 Residential real estate and home equity 353 356 136 Consumer — — — Total with a reserve recorded 5,421 5,424 769 Total impaired loans $ 12,519 $ 12,522 $ 769 December 31, 2016 With no related reserve recorded: Commercial and agricultural $ 1,700 $ 1,700 $ — Auto and light truck 115 115 — Medium and heavy duty truck — — — Aircraft 2,918 2,918 — Construction equipment 605 605 — Commercial real estate 2,607 2,607 — Residential real estate and home equity — — — Consumer — — — Total with no related reserve recorded 7,945 7,945 — With a reserve recorded: Commercial and agricultural 1,890 1,890 297 Auto and light truck — — — Medium and heavy duty truck — — — Aircraft 3,192 3,192 1,076 Construction equipment 562 562 35 Commercial real estate 2,765 2,765 322 Residential real estate and home equity 674 676 148 Consumer — — — Total with a reserve recorded 9,083 9,085 1,878 Total impaired loans $ 17,028 $ 17,030 $ 1,878
Schedule of average recorded investment and interest income recognized on impaired loans and leases, segregated by class	The following table shows average recorded investment and interest income recognized on impaired loans and leases, segregated by class. Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (Dollars in thousands) Average Recorded Investment Interest Income Average Recorded Investment Interest Income Average Recorded Investment Interest Income Average Recorded Investment Interest Income Commercial and agricultural $ 4,551 $ — $ 3,282 $ 1 $ 4,774 $ 1 $ 3,480 $ 5 Auto and light truck 208 — — — 158 — — — Medium and heavy duty truck 1,551 — — — 517 — — — Aircraft 2,519 5 9,051 2 5,830 5 5,806 2 Construction equipment 949 — 618 — 1,084 — 671 — Commercial real estate 2,881 2 2,961 — 3,168 2 5,821 123 Residential real estate and home equity 354 3 362 4 356 11 364 12 Consumer — — — — — — — — Total $ 13,013 $ 10 $ 16,274 $ 7 $ 15,887 $ 19 $ 16,142 $ 142
Schedule of recorded investment in loans and leases classified as troubled debt restructuring	The following table shows the recorded investment of loans and leases classified as troubled debt restructurings as of September 30, 2017 and December 31, 2016 . (Dollars in thousands) September 30, December 31, Performing TDRs $ 353 $ 360 Nonperforming TDRs 617 1,642 Total TDRs $ 970 $ 2,002

Reserve for Loan and Lease Lo25

Reserve for Loan and Lease Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Schedule of changes in reserve for loan and lease losses, segregated by class	The following table shows the changes in the reserve for loan and lease losses, segregated by class, for the three months ended September 30, 2017 and 2016 . (Dollars in thousands) Commercial and agricultural Auto and light truck Medium and heavy duty truck Aircraft Construction Commercial real estate Residential real estate and home equity Consumer Total September 30, 2017 Balance, beginning of period $ 16,199 $ 11,443 $ 4,840 $ 31,822 $ 9,249 $ 13,475 $ 3,607 $ 1,279 $ 91,914 Charge-offs 434 88 — 115 48 342 29 238 1,294 Recoveries 64 13 — 12 243 733 2 65 1,132 Net charge-offs (recoveries) 370 75 — 103 (195 ) (391 ) 27 173 162 Provision (recovery of provision) (91 ) (405 ) (100 ) 1,811 (193 ) 400 28 170 1,620 Balance, end of period $ 15,738 $ 10,963 $ 4,740 $ 33,530 $ 9,251 $ 14,266 $ 3,608 $ 1,276 $ 93,372 September 30, 2016 Balance, beginning of period $ 14,835 $ 11,667 $ 4,350 $ 34,661 $ 7,512 $ 13,462 $ 3,616 $ 1,355 $ 91,458 Charge-offs 206 1 — 4,834 36 31 63 166 5,337 Recoveries 160 65 — 186 172 48 11 67 709 Net charge-offs (recoveries) 46 (64 ) — 4,648 (136 ) (17 ) 52 99 4,628 Provision (recovery of provision) 90 (3,998 ) (72 ) 5,148 286 460 94 59 2,067 Balance, end of period $ 14,879 $ 7,733 $ 4,278 $ 35,161 $ 7,934 $ 13,939 $ 3,658 $ 1,315 $ 88,897 The following table shows the changes in the reserve for loan and lease losses, segregated by class, for the nine months ended September 30, 2017 and 2016 . (Dollars in thousands) Commercial and agricultural loans Auto and light truck Medium and heavy duty truck Aircraft Construction Commercial real estate Residential real estate and home equity Consumer loans Total September 30, 2017 Balance, beginning of period $ 14,668 $ 8,064 $ 4,740 $ 34,352 $ 8,207 $ 13,677 $ 3,550 $ 1,285 $ 88,543 Charge-offs 903 170 — 1,872 75 344 66 608 4,038 Recoveries 748 1,145 — 210 272 831 89 214 3,509 Net charge-offs (recoveries) 155 (975 ) — 1,662 (197 ) (487 ) (23 ) 394 529 Provision (recovery of provision) 1,225 1,924 — 840 847 102 35 385 5,358 Balance, end of period $ 15,738 $ 10,963 $ 4,740 $ 33,530 $ 9,251 $ 14,266 $ 3,608 $ 1,276 $ 93,372 September 30, 2016 Balance, beginning of period $ 15,456 $ 9,269 $ 4,699 $ 32,373 $ 7,592 $ 13,762 $ 3,662 $ 1,299 $ 88,112 Charge-offs 422 4 — 4,834 128 32 192 620 6,232 Recoveries 360 191 10 412 320 388 28 217 1,926 Net charge-offs (recoveries) 62 (187 ) (10 ) 4,422 (192 ) (356 ) 164 403 4,306 Provision (recovery of provision) (515 ) (1,723 ) (431 ) 7,210 150 (179 ) 160 419 5,091 Balance, end of period $ 14,879 $ 7,733 $ 4,278 $ 35,161 $ 7,934 $ 13,939 $ 3,658 $ 1,315 $ 88,897 The following table shows the reserve for loan and lease losses and recorded investment in loans and leases, segregated by class, separated between individually and collectively evaluated for impairment as of September 30, 2017 and December 31, 2016 . (Dollars in thousands) Commercial and agricultural loans Auto and light truck Medium and heavy duty truck Aircraft Construction Commercial real estate Residential real estate and home equity Consumer loans Total September 30, 2017 Reserve for loan and lease losses Ending balance, individually evaluated for impairment $ 444 $ — $ — $ — $ — $ 189 $ 136 $ — $ 769 Ending balance, collectively evaluated for impairment 15,294 10,963 4,740 33,530 9,251 14,077 3,472 1,276 92,603 Total reserve for loan and lease losses $ 15,738 $ 10,963 $ 4,740 $ 33,530 $ 9,251 $ 14,266 $ 3,608 $ 1,276 $ 93,372 Recorded investment in loans Ending balance, individually evaluated for impairment $ 4,458 $ — $ 1,505 $ 2,157 $ 593 $ 3,453 $ 353 $ — $ 12,519 Ending balance, collectively evaluated for impairment 888,716 505,126 286,470 813,963 541,245 736,892 523,718 128,069 4,424,199 Total recorded investment in loans $ 893,174 $ 505,126 $ 287,975 $ 816,120 $ 541,838 $ 740,345 $ 524,071 $ 128,069 $ 4,436,718 December 31, 2016 Reserve for loan and lease losses Ending balance, individually evaluated for impairment $ 297 $ — $ — $ 1,076 $ 35 $ 322 $ 148 $ — $ 1,878 Ending balance, collectively evaluated for impairment 14,371 8,064 4,740 33,276 8,172 13,355 3,402 1,285 86,665 Total reserve for loan and lease losses $ 14,668 $ 8,064 $ 4,740 $ 34,352 $ 8,207 $ 13,677 $ 3,550 $ 1,285 $ 88,543 Recorded investment in loans Ending balance, individually evaluated for impairment $ 3,590 $ 115 $ — $ 6,110 $ 1,167 $ 5,372 $ 674 $ — $ 17,028 Ending balance, collectively evaluated for impairment 808,674 411,649 294,790 796,304 494,758 713,798 521,257 129,813 4,171,043 Total recorded investment in loans $ 812,264 $ 411,764 $ 294,790 $ 802,414 $ 495,925 $ 719,170 $ 521,931 $ 129,813 $ 4,188,071

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2017
Transfers and Servicing of Financial Assets [Abstract]
Schedule of changes in carrying value of mortgage servicing rights and associated valuation allowance	The following table shows changes in the carrying value of MSRs and the associated valuation allowance. Three Months Ended Nine Months Ended (Dollars in thousands) 2017 2016 2017 2016 Mortgage servicing rights: Balance at beginning of period $ 4,239 $ 4,339 $ 4,297 $ 4,608 Additions 391 313 884 760 Amortization (270 ) (417 ) (821 ) (1,133 ) Sales — — — — Carrying value before valuation allowance at end of period 4,360 4,235 4,360 4,235 Valuation allowance: Balance at beginning of period — — — — Impairment recoveries — — — — Balance at end of period $ — $ — $ — $ — Net carrying value of mortgage servicing rights at end of period $ 4,360 $ 4,235 $ 4,360 $ 4,235 Fair value of mortgage servicing rights at end of period $ 7,097 $ 5,666 $ 7,097 $ 5,666

Commitments and Financial Ins27

Commitments and Financial Instruments with Off-Balance-Sheet Risk (Tables)	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of financial instruments whose contract amounts represent credit risk	The following table shows financial instruments whose contract amounts represent credit risk. (Dollars in thousands) September 30, 2017 December 31, 2016 Amounts of commitments: Loan commitments to extend credit $ 939,797 $ 868,267 Standby letters of credit $ 30,215 $ 33,397 Commercial and similar letters of credit $ 3,172 $ 1,704

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of amounts of non-hedging derivative financial instruments	The following table shows the amounts of non-hedging derivative financial instruments. Asset derivatives Liability derivatives (Dollars in thousands) Notional or contractual amount Statement of Financial Condition classification Fair value Statement of Financial Condition classification Fair value September 30, 2017 Interest rate swap contracts $ 621,154 Other assets $ 5,680 Other liabilities $ 5,785 Loan commitments 10,945 Mortgages held for sale 100 N/A — Forward contracts - mortgage loan 19,516 N/A — Mortgages held for sale 4 Total $ 651,615 $ 5,780 $ 5,789 December 31, 2016 Interest rate swap contracts $ 570,004 Other assets $ 6,621 Other liabilities $ 6,743 Loan commitments 5,527 Mortgages held for sale 43 N/A — Forward contracts - mortgage loan 16,525 Mortgages held for sale 222 N/A — Total $ 592,056 $ 6,886 $ 6,743
Schedule of amounts included in the consolidated statements of income for non-hedging derivative financial instruments	The following table shows the amounts included in the Statements of Income for non-hedging derivative financial instruments. Gain (loss) Three Months Ended Nine Months Ended (Dollars in thousands) Statement of Income classification 2017 2016 2017 2016 Interest rate swap contracts Other expense $ (3 ) $ 36 $ 17 $ (100 ) Interest rate swap contracts Other income 733 150 944 464 Loan commitments Mortgage banking 20 (105 ) 57 16 Forward contracts - mortgage loan Mortgage banking (31 ) 190 (226 ) (130 ) Total $ 719 $ 271 $ 792 $ 250
Schedule of offsetting of financial assets and derivative assets	The following table shows the offsetting of financial assets and derivative assets. Gross Amounts Not Offset in the Statement of Financial Condition (Dollars in thousands) Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Condition Net Amounts of Assets Presented in the Statement of Financial Condition Financial Instruments Cash Collateral Received Net Amount September 30, 2017 Interest rate swaps $ 5,707 $ 27 $ 5,680 $ — $ — $ 5,680 December 31, 2016 Interest rate swaps $ 6,681 $ 60 $ 6,621 $ — $ — $ 6,621
Schedule of offsetting of financial liabilities and derivative liabilities	The following table shows the offsetting of financial liabilities and derivative liabilities. Gross Amounts Not Offset in the Statement of Financial Condition (Dollars in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Condition Net Amounts of Liabilities Presented in the Statement of Financial Condition Financial Instruments Cash Collateral Pledged Net Amount September 30, 2017 Interest rate swaps $ 5,812 $ 27 $ 5,785 $ — $ 5,206 $ 579 Repurchase agreements 148,001 — 148,001 148,001 — — Total $ 153,813 $ 27 $ 153,786 $ 148,001 $ 5,206 $ 579 December 31, 2016 Interest rate swaps $ 6,803 $ 60 $ 6,743 $ — $ 3,794 $ 2,949 Repurchase agreements 162,913 — 162,913 162,913 — — Total $ 169,716 $ 60 $ 169,656 $ 162,913 $ 3,794 $ 2,949

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Schedule of reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share	The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share. Three Months Ended Nine Months Ended (Dollars in thousands - except per share amounts) 2017 2016 2017 2016 Distributed earnings allocated to common stock $ 4,928 $ 4,656 $ 14,514 $ 13,995 Undistributed earnings allocated to common stock 12,122 9,515 35,162 28,260 Net earnings allocated to common stock 17,050 14,171 49,676 42,255 Net earnings allocated to participating securities 132 93 381 306 Net income allocated to common stock and participating securities $ 17,182 $ 14,264 $ 50,057 $ 42,561 Weighted average shares outstanding for basic earnings per common share 25,935,867 25,867,169 25,922,218 25,881,360 Dilutive effect of stock compensation — — — — Weighted average shares outstanding for diluted earnings per common share 25,935,867 25,867,169 25,922,218 25,881,360 Basic earnings per common share $ 0.66 $ 0.55 $ 1.92 $ 1.63 Diluted earnings per common share $ 0.66 $ 0.55 $ 1.92 $ 1.63

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of reclassifications out of accumulated other comprehensive income	The following table presents reclassifications out of accumulated other comprehensive income related to unrealized gains and losses on available-for-sale securities. Three Months Ended Nine Months Ended Affected Line Item in the Statements of Income (Dollars in thousands) 2017 2016 2017 2016 Realized gains included in net income $ 1,007 $ 989 $ 2,757 $ 790 Gains on investment securities available-for-sale 1,007 989 2,757 790 Income before income taxes Tax effect (378 ) (371 ) (1,035 ) (296 ) Income tax expense Net of tax $ 629 $ 618 $ 1,722 $ 494 Net income

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair value measurements
Schedule of differences between the fair value carrying amount of mortgages held for sale measured at fair value and the aggregate unpaid principal amount	The following table shows the differences between the fair value carrying amount of mortgages held for sale measured at fair value and the aggregate unpaid principal amount the Company is contractually entitled to receive at maturity. (Dollars in thousands) Fair value carrying amount Aggregate unpaid principal Excess of fair value carrying amount over (under) unpaid principal September 30, 2017 Mortgages held for sale reported at fair value $ 11,000 $ 10,788 $ 212 (1) December 31, 2016 Mortgages held for sale reported at fair value $ 15,849 $ 15,809 $ 40 (1) (1) The excess of fair value carrying amount over (under) unpaid principal is included in mortgage banking income and includes changes in fair value at and subsequent to funding and gains and losses on the related loan commitment prior to funding.
Schedule of assets and liabilities measured at fair value on a recurring basis	The following table shows the balance of assets and liabilities measured at fair value on a recurring basis. (Dollars in thousands) Level 1 Level 2 Level 3 Total September 30, 2017 Assets: Investment securities available-for-sale: U.S. Treasury and Federal agencies securities $ 20,233 $ 437,393 $ — $ 457,626 U.S. States and political subdivisions securities — 120,158 2,968 123,126 Mortgage-backed securities — Federal agencies — 276,857 — 276,857 Corporate debt securities — 31,479 — 31,479 Foreign government and other securities — — 202 202 Total debt securities 20,233 865,887 3,170 889,290 Marketable equity securities 4,683 — — 4,683 Total investment securities available-for-sale 24,916 865,887 3,170 893,973 Mortgages held for sale — 11,000 — 11,000 Accrued income and other assets (interest rate swap agreements) — 5,680 — 5,680 Total $ 24,916 $ 882,567 $ 3,170 $ 910,653 Liabilities: Accrued expenses and other liabilities (interest rate swap agreements) $ — $ 5,785 $ — $ 5,785 Total $ — $ 5,785 $ — $ 5,785 December 31, 2016 Assets: Investment securities available-for-sale: U.S. Treasury and Federal agencies securities $ 20,164 $ 400,669 $ — $ 420,833 U.S. States and political subdivisions securities — 130,276 2,699 132,975 Mortgage-backed securities — Federal agencies — 252,574 — 252,574 Corporate debt securities — 35,076 — 35,076 Foreign government and other securities — — 807 807 Total debt securities 20,164 818,595 3,506 842,265 Marketable equity securities 8,202 — — 8,202 Total investment securities available-for-sale 28,366 818,595 3,506 850,467 Mortgages held for sale — 15,849 — 15,849 Accrued income and other assets (interest rate swap agreements) — 6,621 — 6,621 Total $ 28,366 $ 841,065 $ 3,506 $ 872,937 Liabilities: Accrued expenses and other liabilities (interest rate swap agreements) $ — $ 6,743 $ — $ 6,743 Total $ — $ 6,743 $ — $ 6,743
Schedule of changes in investment securities available-for-sale Level 3 assets measured at fair value on a recurring basis	The following table shows changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the quarter ended September 30, 2017 and 2016 . (Dollars in thousands) U.S. States and political subdivisions securities Foreign government and other securities Investment securities available-for-sale Beginning balance July 1, 2017 $ 1,801 $ 302 $ 2,103 Total gains or losses (realized/unrealized): Included in earnings — — — Included in other comprehensive income 17 — 17 Purchases 1,150 — 1,150 Issuances — — — Sales — — — Settlements — — — Maturities — (100 ) (100 ) Transfers into Level 3 — — — Transfers out of Level 3 — — — Ending balance September 30, 2017 $ 2,968 $ 202 $ 3,170 Beginning balance July 1, 2016 $ 4,661 $ 810 $ 5,471 Total gains or losses (realized/unrealized): Included in earnings — — — Included in other comprehensive income (16 ) — (16 ) Purchases — — — Issuances — — — Sales — — — Settlements — — — Maturities (662 ) — (662 ) Transfers into Level 3 — — — Transfers out of Level 3 — — — Ending balance September 30, 2016 $ 3,983 $ 810 $ 4,793
Schedule of carrying value of assets measured at fair value on a non-recurring basis	The following table shows the carrying value of assets measured at fair value on a non-recurring basis. (Dollars in thousands) Level 1 Level 2 Level 3 Total September 30, 2017 Impaired loans - collateral based $ — $ — $ 3,841 $ 3,841 Accrued income and other assets (partnership investments) — — 1,033 1,033 Accrued income and other assets (mortgage servicing rights) — — 4,360 4,360 Accrued income and other assets (repossessions) — — 12,913 12,913 Accrued income and other assets (other real estate) — — 1,341 1,341 Total $ — $ — $ 23,488 $ 23,488 December 31, 2016 Impaired loans - collateral based $ — $ — $ 6,280 $ 6,280 Accrued income and other assets (partnership investments) — — 1,032 1,032 Accrued income and other assets (mortgage servicing rights) — — 4,297 4,297 Accrued income and other assets (repossessions) — — 9,373 9,373 Accrued income and other assets (other real estate) — — 704 704 Total $ — $ — $ 21,686 $ 21,686
Schedule of fair values of financial instruments	The following table shows the fair values of the Company’s financial instruments. (Dollars in thousands) Carrying or Contract Value Fair Value Level 1 Level 2 Level 3 September 30, 2017 Assets: Cash and due from banks $ 64,636 $ 64,636 $ 64,636 $ — $ — Federal funds sold and interest bearing deposits with other banks 34,788 34,788 34,788 — — Investment securities, available-for-sale 893,973 893,973 24,916 865,887 3,170 Other investments 25,953 25,953 25,953 — — Mortgages held for sale 11,000 11,000 — 11,000 — Loans and leases, net of reserve for loan and lease losses 4,343,346 4,343,808 — — 4,343,808 Mortgage servicing rights 4,360 7,097 — — 7,097 Interest rate swaps 5,680 5,680 — 5,680 — Liabilities: Deposits $ 4,573,712 $ 4,571,242 $ 3,337,440 $ 1,233,802 $ — Short-term borrowings 316,765 316,765 148,771 167,994 — Long-term debt and mandatorily redeemable securities 70,482 69,221 — 69,221 — Subordinated notes 58,764 56,048 — 56,048 — Interest rate swaps 5,785 5,785 — 5,785 — Off-balance-sheet instruments * — 300 — 300 — December 31, 2016 Assets: Cash and due from banks $ 58,578 $ 58,578 $ 58,578 $ — $ — Federal funds sold and interest bearing deposits with other banks 49,726 49,726 49,726 — — Investment securities, available-for-sale 850,467 850,467 28,366 818,595 3,506 Other investments 22,458 22,458 22,458 — — Mortgages held for sale 15,849 15,849 — 15,849 — Loans and leases, net of reserve for loan and lease losses 4,099,528 4,107,079 — — 4,107,079 Mortgage servicing rights 4,297 7,484 — — 7,484 Interest rate swaps 6,621 6,621 — 6,621 — Liabilities: Deposits $ 4,333,760 $ 4,332,744 $ 3,277,108 $ 1,055,636 $ — Short-term borrowings 291,943 291,943 163,652 128,291 — Long-term debt and mandatorily redeemable securities 74,308 73,149 — 73,149 — Subordinated notes 58,764 51,031 — 51,031 — Interest rate swaps 6,743 6,743 — 6,743 — Off-balance-sheet instruments * — 382 — 382 — * Represents estimated cash outflows required to currently settle the obligations at current market rates.
Recurring
Fair value measurements
Schedule of valuation methodology and unobservable inputs for Level 3 assets and liabilities measured at fair value on a recurring and non-recurring basis	The following table shows the valuation methodology and unobservable inputs for Level 3 assets and liabilities measured at fair value on a recurring basis. (Dollars in thousands) Fair Value Valuation Methodology Unobservable Inputs Range of Inputs September 30, 2017 Investment securities available-for sale Direct placement municipal securities $ 2,968 Discounted cash flows Credit spread assumption 1.74% - 2.64% Foreign government $ 202 Discounted cash flows Market yield assumption 0.50% - 0.61% December 31, 2016 Investment securities available-for sale Direct placement municipal securities $ 2,699 Discounted cash flows Credit spread assumption 0.92% - 3.17% Foreign government $ 807 Discounted cash flows Market yield assumption 0.28% - 1.12%
Non-recurring
Fair value measurements
Schedule of valuation methodology and unobservable inputs for Level 3 assets and liabilities measured at fair value on a recurring and non-recurring basis	The following table below shows the valuation methodology and unobservable inputs for Level 3 assets and liabilities measured at fair value on a non-recurring basis. (Dollars in thousands) Carrying Value Fair Value Valuation Methodology Unobservable Inputs Range of Inputs September 30, 2017 Impaired loans $ 3,841 $ 3,841 Collateral based measurements including appraisals, trade publications, and auction values Discount for lack of marketability and current conditions 15% - 20% Mortgage servicing rights 4,360 7,097 Discounted cash flows Constant prepayment rate (CPR) 9.1% - 18.8% Discount rate 9.5% - 12.4% Repossessions 12,913 13,410 Appraisals, trade publications and auction values Discount for lack of marketability 3% - 10% Other real estate 1,341 1,401 Appraisals Discount for lack of marketability 0% - 10% December 31, 2016 Impaired loans $ 6,280 $ 6,280 Collateral based measurements including appraisals, trade publications, and auction values Discount for lack of marketability and current conditions 0% - 100% Mortgage servicing rights 4,297 7,484 Discounted cash flows Constant prepayment rate (CPR) 8.6% - 15.0% Discount rate 9.6% - 12.5% Repossessions 9,373 9,452 Appraisals, trade publications and auction values Discount for lack of marketability 0% - 4% Other real estate 704 752 Appraisals Discount for lack of marketability 0% - 16%

Accounting Policies Accounting

Accounting Policies Accounting Policies (Details) - Minimum	9 Months Ended
	Sep. 30, 2017USD ($)
Summary of Significant Accounting Policies [Line Items]
Period of sustained performance required to change from non-performing to performing status	6 months
Amount necessary for impairment evaluation	$ 100,000

Recent Accounting Pronounceme33

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Item Effected [Line Items]
Assets	$ 5,806,735	$ 5,486,268
Liabilities and shareholders' equity	$ 5,806,735	5,486,268
Minimum | Accounting Standards Update 2016-02
Item Effected [Line Items]
Assets		12,000
Liabilities and shareholders' equity		12,000
Maximum | Accounting Standards Update 2016-02
Item Effected [Line Items]
Assets		15,000
Liabilities and shareholders' equity		$ 15,000

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment Securities
Total investment securities available-for-sale, Amortized Cost	$ 891,648	$ 848,316
Gross Unrealized Gains	7,997	11,145
Gross Unrealized Losses	(5,672)	(8,994)
Investment securities, available-for-sale	893,973	850,467
Contractual maturities of investments in debt securities available-for-sale, Amortized Cost
Due in one year or less	119,304
Due after one year through five years	448,884
Due after five years through ten years	46,071
Due after ten years	0
Mortgage-backed securities	276,791
Total debt securities available-for-sale	891,050
Contractual maturities of investments in debt securities available-for-sale, Fair Value
Due in one year or less	119,624
Due after one year through five years	446,985
Due after five years through ten years	45,824
Due after ten years	0
Mortgage-backed securities	276,857
Total debt securities available-for-sale	889,290
U.S. Treasury and Federal agencies securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	460,282	424,495
Gross Unrealized Gains	453	809
Gross Unrealized Losses	(3,109)	(4,471)
Investment securities, available-for-sale	457,626	420,833
U.S. States and political subdivisions securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	122,178	133,509
Gross Unrealized Gains	1,407	1,036
Gross Unrealized Losses	(459)	(1,570)
Investment securities, available-for-sale	123,126	132,975
Mortgage-backed securities - Federal agencies
Investment Securities
Total investment securities available-for-sale, Amortized Cost	276,791	252,981
Gross Unrealized Gains	1,989	2,175
Gross Unrealized Losses	(1,923)	(2,582)
Investment securities, available-for-sale	276,857	252,574
Corporate debt securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	31,599	35,266
Gross Unrealized Gains	48	111
Gross Unrealized Losses	(168)	(301)
Investment securities, available-for-sale	31,479	35,076
Foreign government and other securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	200	800
Gross Unrealized Gains	2	7
Gross Unrealized Losses	0	0
Investment securities, available-for-sale	202	807
Total debt securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	891,050	847,051
Gross Unrealized Gains	3,899	4,138
Gross Unrealized Losses	(5,659)	(8,924)
Investment securities, available-for-sale	889,290	842,265
Marketable equity securities
Investment Securities
Total investment securities available-for-sale, Amortized Cost	598	1,265
Gross Unrealized Gains	4,098	7,007
Gross Unrealized Losses	(13)	(70)
Investment securities, available-for-sale	$ 4,683	$ 8,202

Investment Securities (Details

Investment Securities (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value
Less than 12 Months	$ 374,425		$ 374,425		$ 519,955
12 months or Longer	186,739		186,739		8,443
Total fair value	561,164		561,164		528,398
Unrealized Losses
Less than 12 Months	(2,657)		(2,657)		(8,698)
12 months or Longer	(3,015)		(3,015)		(296)
Total unrealized losses	(5,672)		(5,672)		(8,994)
Gross realized gains and losses
Gross realized gains	1,007	$ 989	2,947	$ 1,084
Gross realized losses	0	0	0	0
OTTI losses	0	0	(190)	(294)
Net realized gains (losses)	1,007	$ 989	2,757	$ 790
Investment securities pledged as collateral	279,990		279,990		276,290
U.S. Treasury and Federal agencies securities
Fair Value
Less than 12 Months	238,505		238,505		263,680
12 months or Longer	97,156		97,156		0
Total fair value	335,661		335,661		263,680
Unrealized Losses
Less than 12 Months	(1,482)		(1,482)		(4,471)
12 months or Longer	(1,627)		(1,627)		0
Total unrealized losses	(3,109)		(3,109)		(4,471)
U.S. States and political subdivisions securities
Fair Value
Less than 12 Months	17,119		17,119		74,129
12 months or Longer	22,213		22,213		3,337
Total fair value	39,332		39,332		77,466
Unrealized Losses
Less than 12 Months	(107)		(107)		(1,515)
12 months or Longer	(352)		(352)		(55)
Total unrealized losses	(459)		(459)		(1,570)
Mortgage-backed securities - Federal agencies
Fair Value
Less than 12 Months	108,863		108,863		168,554
12 months or Longer	59,233		59,233		5,102
Total fair value	168,096		168,096		173,656
Unrealized Losses
Less than 12 Months	(1,043)		(1,043)		(2,341)
12 months or Longer	(880)		(880)		(241)
Total unrealized losses	(1,923)		(1,923)		(2,582)
Corporate debt securities
Fair Value
Less than 12 Months	9,789		9,789		13,312
12 months or Longer	8,134		8,134		0
Total fair value	17,923		17,923		13,312
Unrealized Losses
Less than 12 Months	(13)		(13)		(301)
12 months or Longer	(155)		(155)		0
Total unrealized losses	(168)		(168)		(301)
Foreign government and other securities
Fair Value
Less than 12 Months	0		0		0
12 months or Longer	0		0		0
Total fair value	0		0		0
Unrealized Losses
Less than 12 Months	0		0		0
12 months or Longer	0		0		0
Total unrealized losses	0		0		0
Total debt securities
Fair Value
Less than 12 Months	374,276		374,276		519,675
12 months or Longer	186,736		186,736		8,439
Total fair value	561,012		561,012		528,114
Unrealized Losses
Less than 12 Months	(2,645)		(2,645)		(8,628)
12 months or Longer	(3,014)		(3,014)		(296)
Total unrealized losses	(5,659)		(5,659)		(8,924)
Marketable equity securities
Fair Value
Less than 12 Months	149		149		280
12 months or Longer	3		3		4
Total fair value	152		152		284
Unrealized Losses
Less than 12 Months	(12)		(12)		(70)
12 months or Longer	(1)		(1)		0
Total unrealized losses	$ (13)		$ (13)		$ (70)

Loan and Lease Financings (Deta

Loan and Lease Financings (Details)	9 Months Ended
	Sep. 30, 2017USD ($)item	Dec. 31, 2016USD ($)
Receivables [Abstract]
Number of methods to assess credit risk | item	2
Loan and Lease Financings
Recorded investment in loans and leases	$ 4,436,718,000	$ 4,188,071,000
Loan and lease financings excluding residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	3,784,578,000	3,536,327,000
Commercial and agricultural
Loan and Lease Financings
Recorded investment in loans and leases	893,174,000	812,264,000
Auto and light truck
Loan and Lease Financings
Recorded investment in loans and leases	505,126,000	411,764,000
Medium and heavy duty truck
Loan and Lease Financings
Recorded investment in loans and leases	287,975,000	294,790,000
Aircraft
Loan and Lease Financings
Recorded investment in loans and leases	816,120,000	802,414,000
Construction equipment
Loan and Lease Financings
Recorded investment in loans and leases	541,838,000	495,925,000
Commercial real estate
Loan and Lease Financings
Recorded investment in loans and leases	740,345,000	719,170,000
Credit Quality Grades 1-6 | Loan and lease financings excluding residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	3,694,850,000	3,451,277,000
Credit Quality Grades 1-6 | Commercial and agricultural
Loan and Lease Financings
Recorded investment in loans and leases	869,111,000	784,811,000
Credit Quality Grades 1-6 | Auto and light truck
Loan and Lease Financings
Recorded investment in loans and leases	490,765,000	407,931,000
Credit Quality Grades 1-6 | Medium and heavy duty truck
Loan and Lease Financings
Recorded investment in loans and leases	282,200,000	291,558,000
Credit Quality Grades 1-6 | Aircraft
Loan and Lease Financings
Recorded investment in loans and leases	794,533,000	772,802,000
Credit Quality Grades 1-6 | Construction equipment
Loan and Lease Financings
Recorded investment in loans and leases	529,910,000	486,923,000
Credit Quality Grades 1-6 | Commercial real estate
Loan and Lease Financings
Recorded investment in loans and leases	728,331,000	707,252,000
Credit Quality Grades 7-12
Loan and Lease Financings
Relationships reviewed quarterly as part of management's evaluation of the appropriateness of the reserve for loan and lease losses	100,000
Credit Quality Grades 7-12 | Loan and lease financings excluding residential real estate and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	89,728,000	85,050,000
Credit Quality Grades 7-12 | Commercial and agricultural
Loan and Lease Financings
Recorded investment in loans and leases	24,063,000	27,453,000
Credit Quality Grades 7-12 | Auto and light truck
Loan and Lease Financings
Recorded investment in loans and leases	14,361,000	3,833,000
Credit Quality Grades 7-12 | Medium and heavy duty truck
Loan and Lease Financings
Recorded investment in loans and leases	5,775,000	3,232,000
Credit Quality Grades 7-12 | Aircraft
Loan and Lease Financings
Recorded investment in loans and leases	21,587,000	29,612,000
Credit Quality Grades 7-12 | Construction equipment
Loan and Lease Financings
Recorded investment in loans and leases	11,928,000	9,002,000
Credit Quality Grades 7-12 | Commercial real estate
Loan and Lease Financings
Recorded investment in loans and leases	$ 12,014,000	$ 11,918,000

Loan and Lease Financings (De37

Loan and Lease Financings (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Loan and Lease Financings
Recorded investment in loans and leases	$ 4,436,718	$ 4,188,071
Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	652,140	651,744
Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	524,071	521,931
Consumer
Loan and Lease Financings
Recorded investment in loans and leases	128,069	129,813
Performing | Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	649,809	648,481
Performing | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	521,928	518,896
Performing | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 127,881	129,585
Nonperforming
Loan and Lease Financings
Classification of nonperforming loans, threshold period past due	90 days
Nonperforming | Residential real estate and home equity and consumer loans
Loan and Lease Financings
Recorded investment in loans and leases	$ 2,331	3,263
Nonperforming | Residential real estate and home equity
Loan and Lease Financings
Recorded investment in loans and leases	2,143	3,035
Nonperforming | Consumer
Loan and Lease Financings
Recorded investment in loans and leases	$ 188	$ 228

Loan and Lease Financings (De38

Loan and Lease Financings (Details 3) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	$ 4,410,001	$ 4,158,757
90 Days or More Past Due and Accruing	208	416
Total Accruing Loans	4,421,652	4,168,164
Nonaccrual	15,066	19,907
Total loans and leases	4,436,718	4,188,071
30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	10,490	5,169
60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	953	3,822
Commercial and agricultural
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	888,356	808,283
Total Accruing Loans	888,467	808,283
Nonaccrual	4,707	3,981
Total loans and leases	893,174	812,264
Commercial and agricultural | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	80	0
Commercial and agricultural | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	31	0
Auto and light truck
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	502,339	411,300
Total Accruing Loans	502,862	411,598
Nonaccrual	2,264	166
Total loans and leases	505,126	411,764
Auto and light truck | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	489	298
Auto and light truck | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	34	0
Medium and heavy duty truck
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	287,975	294,790
Total Accruing Loans	287,975	294,790
Nonaccrual	0	0
Total loans and leases	287,975	294,790
Medium and heavy duty truck | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Medium and heavy duty truck | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Aircraft
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	805,389	791,559
Total Accruing Loans	813,892	796,304
Nonaccrual	2,228	6,110
Total loans and leases	816,120	802,414
Aircraft | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	8,503	1,429
Aircraft | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	3,316
Construction equipment
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	541,279	493,131
Total Accruing Loans	541,646	494,677
Nonaccrual	192	1,248
Total loans and leases	541,838	495,925
Construction equipment | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	367	1,546
Construction equipment | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Commercial real estate
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	736,682	713,482
Total Accruing Loans	736,793	713,615
Nonaccrual	3,552	5,555
Total loans and leases	740,345	719,170
Commercial real estate | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	111	133
Commercial real estate | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Residential real estate and home equity
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	520,741	517,212
90 Days or More Past Due and Accruing	192	394
Total Accruing Loans	522,120	519,290
Nonaccrual	1,951	2,641
Total loans and leases	524,071	521,931
Residential real estate and home equity | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	438	1,310
Residential real estate and home equity | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	749	374
Consumer
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	127,240	129,000
90 Days or More Past Due and Accruing	16	22
Total Accruing Loans	127,897	129,607
Nonaccrual	172	206
Total loans and leases	128,069	129,813
Consumer | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	502	453
Consumer | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	$ 139	$ 132

Loan and Lease Financings (De39

Loan and Lease Financings (Details 4) - 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 and leases
Recorded Investment, With no related allowance recorded	$ 7,098		$ 7,098		$ 7,945
Unpaid Principal Balance, With no related allowance recorded	7,098		7,098		7,945
Recorded Investment, With an allowance recorded	5,421		5,421		9,083
Unpaid Principal Balance, With an allowance recorded	5,424		5,424		9,085
Total Recorded Investment	12,519		12,519		17,028
Total Unpaid Principal Balance	12,522		12,522		17,030
Total Related Allowance	769		769		1,878
Average Recorded Investment	13,013	$ 16,274	15,887	$ 16,142
Interest Income	10	7	19	142
Commercial and agricultural
Impaired loans and leases
Recorded Investment, With no related allowance recorded	392		392		1,700
Unpaid Principal Balance, With no related allowance recorded	392		392		1,700
Recorded Investment, With an allowance recorded	4,066		4,066		1,890
Unpaid Principal Balance, With an allowance recorded	4,066		4,066		1,890
Total Related Allowance	444		444		297
Average Recorded Investment	4,551	3,282	4,774	3,480
Interest Income	0	1	1	5
Auto and light truck
Impaired loans and leases
Recorded Investment, With no related allowance recorded	0		0		115
Unpaid Principal Balance, With no related allowance recorded	0		0		115
Recorded Investment, With an allowance recorded	0		0		0
Unpaid Principal Balance, With an allowance recorded	0		0		0
Total Related Allowance	0		0		0
Average Recorded Investment	208	0	158	0
Interest Income	0	0	0	0
Medium and heavy duty truck
Impaired loans and leases
Recorded Investment, With no related allowance recorded	1,505		1,505		0
Unpaid Principal Balance, With no related allowance recorded	1,505		1,505		0
Recorded Investment, With an allowance recorded	0		0		0
Unpaid Principal Balance, With an allowance recorded	0		0		0
Total Related Allowance	0		0		0
Average Recorded Investment	1,551	0	517	0
Interest Income	0	0	0	0
Aircraft
Impaired loans and leases
Recorded Investment, With no related allowance recorded	2,157		2,157		2,918
Unpaid Principal Balance, With no related allowance recorded	2,157		2,157		2,918
Recorded Investment, With an allowance recorded	0		0		3,192
Unpaid Principal Balance, With an allowance recorded	0		0		3,192
Total Related Allowance	0		0		1,076
Average Recorded Investment	2,519	9,051	5,830	5,806
Interest Income	5	2	5	2
Construction equipment
Impaired loans and leases
Recorded Investment, With no related allowance recorded	593		593		605
Unpaid Principal Balance, With no related allowance recorded	593		593		605
Recorded Investment, With an allowance recorded	0		0		562
Unpaid Principal Balance, With an allowance recorded	0		0		562
Total Related Allowance	0		0		35
Average Recorded Investment	949	618	1,084	671
Interest Income	0	0	0	0
Commercial real estate
Impaired loans and leases
Recorded Investment, With no related allowance recorded	2,451		2,451		2,607
Unpaid Principal Balance, With no related allowance recorded	2,451		2,451		2,607
Recorded Investment, With an allowance recorded	1,002		1,002		2,765
Unpaid Principal Balance, With an allowance recorded	1,002		1,002		2,765
Total Related Allowance	189		189		322
Average Recorded Investment	2,881	2,961	3,168	5,821
Interest Income	2	0	2	123
Residential real estate and home equity
Impaired loans and leases
Recorded Investment, With no related allowance recorded	0		0		0
Unpaid Principal Balance, With no related allowance recorded	0		0		0
Recorded Investment, With an allowance recorded	353		353		674
Unpaid Principal Balance, With an allowance recorded	356		356		676
Total Related Allowance	136		136		148
Average Recorded Investment	354	362	356	364
Interest Income	3	4	11	12
Consumer
Impaired loans and leases
Recorded Investment, With no related allowance recorded	0		0		0
Unpaid Principal Balance, With no related allowance recorded	0		0		0
Recorded Investment, With an allowance recorded	0		0		0
Unpaid Principal Balance, With an allowance recorded	0		0		0
Total Related Allowance	0		0		$ 0
Average Recorded Investment	0	0	0	0
Interest Income	$ 0	$ 0	$ 0	$ 0

Loan and Lease Financings (De40

Loan and Lease Financings (Details 5) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)item	Sep. 30, 2016item	Sep. 30, 2017USD ($)itemmodification	Sep. 30, 2016itemmodification	Dec. 31, 2016USD ($)
Loans and leases classified as TDR
Number of Modifications | item	0	1	1	1
Number of Defaults | item	0	0	1	0
Loans and leases classified as troubled debt restructuring	$ 970		$ 970		$ 2,002
Troubled debt restructured loans and leases which had payment defaults within twelve months following modification
Default threshold			90 days
Performing
Loans and leases classified as TDR
Loans and leases classified as troubled debt restructuring	353		$ 353		360
Nonperforming
Loans and leases classified as TDR
Loans and leases classified as troubled debt restructuring	$ 617		$ 617		$ 1,642
Interest Rate Below Market Reduction
Loans and leases classified as TDR
Number of Modifications | modification			1	1

Reserve for Loan and Lease Lo41

Reserve for Loan and Lease Losses (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)item	Dec. 31, 2016USD ($)
Reserve for loan and lease losses
Number of classes existing in loan and lease portfolio | item					8
Changes in reserve for loan and lease losses
Balance at the beginning of the period	$ 91,914	$ 91,458	$ 88,543	$ 88,112
Charge-offs	1,294	5,337	4,038	6,232
Recoveries	1,132	709	3,509	1,926
Net charge-offs (recoveries)	162	4,628	529	4,306
Provision (recovery of provision)	1,620	2,067	5,358	5,091
Balance at the end of the period	93,372	88,897	93,372	88,897
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					$ 769	$ 1,878
Ending balance, collectively evaluated for impairment					92,603	86,665
Total reserve for loan and lease losses	91,914	91,458	88,543	88,112	93,372	88,543
Recorded investment in loans
Ending balance, individually evaluated for impairment					12,519	17,028
Ending balance, collectively evaluated for impairment					4,424,199	4,171,043
Total loans and leases					4,436,718	4,188,071
Commercial and agricultural
Changes in reserve for loan and lease losses
Balance at the beginning of the period	16,199	14,835	14,668	15,456
Charge-offs	434	206	903	422
Recoveries	64	160	748	360
Net charge-offs (recoveries)	370	46	155	62
Provision (recovery of provision)	(91)	90	1,225	(515)
Balance at the end of the period	15,738	14,879	15,738	14,879
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					444	297
Ending balance, collectively evaluated for impairment					15,294	14,371
Total reserve for loan and lease losses	16,199	14,835	14,668	15,456	15,738	14,668
Recorded investment in loans
Ending balance, individually evaluated for impairment					4,458	3,590
Ending balance, collectively evaluated for impairment					888,716	808,674
Total loans and leases					893,174	812,264
Auto and light truck
Changes in reserve for loan and lease losses
Balance at the beginning of the period	11,443	11,667	8,064	9,269
Charge-offs	88	1	170	4
Recoveries	13	65	1,145	191
Net charge-offs (recoveries)	75	(64)	(975)	(187)
Provision (recovery of provision)	(405)	(3,998)	1,924	(1,723)
Balance at the end of the period	10,963	7,733	10,963	7,733
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					10,963	8,064
Total reserve for loan and lease losses	11,443	11,667	8,064	9,269	10,963	8,064
Recorded investment in loans
Ending balance, individually evaluated for impairment					0	115
Ending balance, collectively evaluated for impairment					505,126	411,649
Total loans and leases					505,126	411,764
Medium and heavy duty truck
Changes in reserve for loan and lease losses
Balance at the beginning of the period	4,840	4,350	4,740	4,699
Charge-offs	0	0	0	0
Recoveries	0	0	0	10
Net charge-offs (recoveries)	0	0	0	(10)
Provision (recovery of provision)	(100)	(72)	0	(431)
Balance at the end of the period	4,740	4,278	4,740	4,278
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					4,740	4,740
Total reserve for loan and lease losses	4,840	4,350	4,740	4,699	4,740	4,740
Recorded investment in loans
Ending balance, individually evaluated for impairment					1,505	0
Ending balance, collectively evaluated for impairment					286,470	294,790
Total loans and leases					287,975	294,790
Aircraft
Changes in reserve for loan and lease losses
Balance at the beginning of the period	31,822	34,661	34,352	32,373
Charge-offs	115	4,834	1,872	4,834
Recoveries	12	186	210	412
Net charge-offs (recoveries)	103	4,648	1,662	4,422
Provision (recovery of provision)	1,811	5,148	840	7,210
Balance at the end of the period	33,530	35,161	33,530	35,161
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					0	1,076
Ending balance, collectively evaluated for impairment					33,530	33,276
Total reserve for loan and lease losses	31,822	34,661	34,352	32,373	33,530	34,352
Recorded investment in loans
Ending balance, individually evaluated for impairment					2,157	6,110
Ending balance, collectively evaluated for impairment					813,963	796,304
Total loans and leases					816,120	802,414
Construction equipment
Changes in reserve for loan and lease losses
Balance at the beginning of the period	9,249	7,512	8,207	7,592
Charge-offs	48	36	75	128
Recoveries	243	172	272	320
Net charge-offs (recoveries)	(195)	(136)	(197)	(192)
Provision (recovery of provision)	(193)	286	847	150
Balance at the end of the period	9,251	7,934	9,251	7,934
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					0	35
Ending balance, collectively evaluated for impairment					9,251	8,172
Total reserve for loan and lease losses	9,249	7,512	8,207	7,592	9,251	8,207
Recorded investment in loans
Ending balance, individually evaluated for impairment					593	1,167
Ending balance, collectively evaluated for impairment					541,245	494,758
Total loans and leases					541,838	495,925
Commercial real estate
Changes in reserve for loan and lease losses
Balance at the beginning of the period	13,475	13,462	13,677	13,762
Charge-offs	342	31	344	32
Recoveries	733	48	831	388
Net charge-offs (recoveries)	(391)	(17)	(487)	(356)
Provision (recovery of provision)	400	460	102	(179)
Balance at the end of the period	14,266	13,939	14,266	13,939
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					189	322
Ending balance, collectively evaluated for impairment					14,077	13,355
Total reserve for loan and lease losses	13,475	13,462	13,677	13,762	14,266	13,677
Recorded investment in loans
Ending balance, individually evaluated for impairment					3,453	5,372
Ending balance, collectively evaluated for impairment					736,892	713,798
Total loans and leases					740,345	719,170
Residential real estate and home equity
Changes in reserve for loan and lease losses
Balance at the beginning of the period	3,607	3,616	3,550	3,662
Charge-offs	29	63	66	192
Recoveries	2	11	89	28
Net charge-offs (recoveries)	27	52	(23)	164
Provision (recovery of provision)	28	94	35	160
Balance at the end of the period	3,608	3,658	3,608	3,658
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					136	148
Ending balance, collectively evaluated for impairment					3,472	3,402
Total reserve for loan and lease losses	3,607	3,616	3,550	3,662	3,608	3,550
Recorded investment in loans
Ending balance, individually evaluated for impairment					353	674
Ending balance, collectively evaluated for impairment					523,718	521,257
Total loans and leases					524,071	521,931
Consumer
Changes in reserve for loan and lease losses
Balance at the beginning of the period	1,279	1,355	1,285	1,299
Charge-offs	238	166	608	620
Recoveries	65	67	214	217
Net charge-offs (recoveries)	173	99	394	403
Provision (recovery of provision)	170	59	385	419
Balance at the end of the period	1,276	1,315	1,276	1,315
Reserve for loan and lease losses
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					1,276	1,285
Total reserve for loan and lease losses	$ 1,279	$ 1,355	$ 1,285	$ 1,299	1,276	1,285
Recorded investment in loans
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					128,069	129,813
Total loans and leases					$ 128,069	$ 129,813

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Residential mortgage loans
Mortgage Servicing Rights
Unpaid principal balance	$ 757,120	$ 761,850

Mortgage Servicing Rights (De43

Mortgage Servicing Rights (Details 2) - Residential mortgage loans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in mortgage servicing assets
Balance at the beginning of the period	$ 4,239	$ 4,339	$ 4,297	$ 4,608
Additions	391	313	884	760
Amortization	(270)	(417)	(821)	(1,133)
Sales	0	0	0	0
Carrying value before valuation allowance at end of period	4,360	4,235	4,360	4,235
Changes in valuation allowance
Balance at the beginning of the period	0	0	0	0
Impairment recoveries	0	0	0	0
Balance at the end of the period	0	0	0	0
Net carrying value of mortgage servicing rights at end of period	4,360	4,235	4,360	4,235
Fair value of mortgage servicing rights at end of period	7,097	5,666	7,097	5,666
Fair value of mortgage servicing rights exceeding the carrying value	2,740	1,430	2,740	1,430
Mortgage loan contractual servicing fees, including late fees and ancillary income	$ 670	$ 680	$ 2,040	$ 2,040

Commitments and Financial Ins44

Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Loan commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet instruments	$ 939,797	$ 868,267
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet instruments	$ 30,215	33,397
Standby letters of credit | Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	6 months
Standby letters of credit | Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	1 year
Commercial and similar letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet instruments	$ 3,172	$ 1,704
Commercial and similar letters of credit | Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	3 months
Commercial and similar letters of credit | Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	6 months

Commitments and Financial Ins45

Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Investments in tax-advantaged and other operating partnerships	$ 23,410	$ 11,140
Tax-advantaged and other operating partnerships commitment	$ 26,470	$ 4,950

Derivative Financial Instrume46

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Non-hedging derivative financial instruments
Derivative Financial Instruments
Notional or contractual amount	$ 651,615	$ 592,056
Asset derivatives, Fair value	5,780	6,886
Liability derivatives, Fair value	5,789	6,743
Interest rate swap contracts
Derivative Financial Instruments
Asset derivatives, Fair value	5,707	6,681
Interest rate swap contracts | Non-hedging derivative financial instruments
Derivative Financial Instruments
Notional or contractual amount	621,154	570,004
Asset derivatives, Fair value	5,680	6,621
Liability derivatives, Fair value	5,785	6,743
Loan commitments | Non-hedging derivative financial instruments
Derivative Financial Instruments
Notional or contractual amount	10,945	5,527
Asset derivatives, Fair value	100	43
Liability derivatives, Fair value	0	0
Forward contracts - mortgage loan | Non-hedging derivative financial instruments
Derivative Financial Instruments
Notional or contractual amount	19,516	16,525
Asset derivatives, Fair value	0	222
Liability derivatives, Fair value	$ 4	$ 0

Derivative Financial Instrume47

Derivative Financial Instruments (Details 2) - Non-hedging derivative financial instruments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Financial Instruments
Gain (loss)	$ 719	$ 271	$ 792	$ 250
Interest rate swap contracts | Other expense
Derivative Financial Instruments
Gain (loss)	(3)	36	17	(100)
Interest rate swap contracts | Other income
Derivative Financial Instruments
Gain (loss)	733	150	944	464
Loan commitments | Mortgage banking income
Derivative Financial Instruments
Gain (loss)	20	(105)	57	16
Forward contracts - mortgage loan | Mortgage banking income
Derivative Financial Instruments
Gain (loss)	$ (31)	$ 190	$ (226)	$ (130)

Derivative Financial Instrume48

Derivative Financial Instruments (Details 3) - Interest rate swaps - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting of financial assets and derivative assets
Gross Amounts of Recognized Assets	$ 5,707	$ 6,681
Gross Amounts Offset in the Statement of Financial Position	27	60
Net Amounts of Assets Presented in the Statement of Financial Position	5,680	6,621
Net Amount	$ 5,680	$ 6,621

Derivative Financial Instrume49

Derivative Financial Instruments (Details 4) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting of financial liabilities and derivative liabilities
Gross Amounts of Recognized Liabilities	$ 153,813	$ 169,716
Gross Amounts Offset in the Statement of Financial Position	27	60
Net Amounts of Liabilities Presented in the Statement of Financial Position	153,786	169,656
Gross amounts Not Offset in the Statement of Financial Position
Financial Instruments	148,001	162,913
Cash Collateral Pledged	5,206	3,794
Net Amount	579	2,949
Interest rate swaps
Offsetting of financial liabilities and derivative liabilities
Gross Amounts of Recognized Liabilities	5,812	6,803
Gross Amounts Offset in the Statement of Financial Position	27	60
Net Amounts of Liabilities Presented in the Statement of Financial Position	5,785	6,743
Gross amounts Not Offset in the Statement of Financial Position
Cash Collateral Pledged	5,206	3,794
Net Amount	579	2,949
Repurchase agreements
Offsetting of financial liabilities and derivative liabilities
Gross Amounts of Recognized Liabilities	148,001	162,913
Net Amounts of Liabilities Presented in the Statement of Financial Position	148,001	162,913
Gross amounts Not Offset in the Statement of Financial Position
Financial Instruments	$ 148,001	$ 162,913

Derivative Financial Instrume50

Derivative Financial Instruments (Details 5) - U.S. Treasury and Federal agencies securities - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Repurchase agreements	$ 146,370	$ 160,380
Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Repurchase agreements	1,330	2,230
Greater than 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Repurchase agreements	$ 300	$ 300

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Outstanding stock options (in shares)	0	0	0	0
Distributed earnings allocated to common stock	$ 4,928	$ 4,656	$ 14,514	$ 13,995
Undistributed earnings allocated to common stock	12,122	9,515	35,162	28,260
Net earnings allocated to common stock	17,050	14,171	49,676	42,255
Net earnings allocated to participating securities	132	93	381	306
Net income allocated to common stock and participating securities	$ 17,182	$ 14,264	$ 50,057	$ 42,561
Weighted average shares outstanding for basic earnings per common share	25,935,867	25,867,169	25,922,218	25,881,360
Dilutive effect of stock compensation (in shares)	0	0	0	0
Weighted average shares outstanding for diluted earnings per common share	25,935,867	25,867,169	25,922,218	25,881,360
Basic earnings per common share (in dollars per share)	$ 0.66	$ 0.55	$ 1.92	$ 1.63
Diluted earnings per common share (in dollars per share)	$ 0.66	$ 0.55	$ 1.92	$ 1.63

Stock Based Compensation (Detai

Stock Based Compensation (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)itemshares	Sep. 30, 2016USD ($)shares
Stock-based compensation
Number of stock-based employee compensation plans | item	4
Number of executive stock award plans | item	3
Outstanding stock options (in shares)	0	0
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $	$ 6,400
Weighted-average period over which unrecognized compensation cost is expected to be recognized	3 years 3 months 15 days
Stock options
Stock-based compensation
Total fair value of options vested and expensed | $	$ 0	$ 0
Outstanding stock options (in shares)	0	0
Stock options exercised (in shares)	0	0

Accumulated Other Comprehensi53

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassifications out of accumulated other comprehensive income
Gains on investment securities available-for-sale	$ 1,007	$ 989	$ 2,757	$ 790
Income before income taxes	26,741	22,147	77,810	65,890
Income tax expense	(9,559)	(7,883)	(27,753)	(23,329)
Net income	17,182	14,264	50,057	42,561
Unrealized gains and losses on available-for-sale securities | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income
Gains on investment securities available-for-sale	1,007	989	2,757	790
Income before income taxes	1,007	989	2,757	790
Income tax expense	(378)	(371)	(1,035)	(296)
Net income	$ 629	$ 618	$ 1,722	$ 494

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits that would affect the effective tax rate if recognized	$ 640		$ 500
Interest and penalties net of tax recognized	50	$ 40
Accrued interest and penalties	$ 90		$ 40

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Fair value measurements
Fair value carrying amount		$ 11,000	$ 15,849
Mortgages held for sale reported at fair value
Fair value measurements
Fair value carrying amount		11,000	15,849
Aggregate unpaid principal		10,788	15,809
Excess of fair value carrying amount over (under) unpaid principal	[1]	$ 212	$ 40
[1]	The excess of fair value carrying amount over (under) unpaid principal is included in mortgage banking income and includes changes in fair value at and subsequent to funding and gains and losses on the related loan commitment prior to funding.

Fair Value Measurements (Deta56

Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Investment securities, available-for-sale	$ 893,973	$ 850,467
Mortgages held for sale	11,000	15,849
U.S. Treasury and Federal agencies securities
Assets:
Investment securities, available-for-sale	457,626	420,833
U.S. States and political subdivisions securities
Assets:
Investment securities, available-for-sale	123,126	132,975
Mortgage-backed securities - Federal agencies
Assets:
Investment securities, available-for-sale	276,857	252,574
Corporate debt securities
Assets:
Investment securities, available-for-sale	31,479	35,076
Foreign government and other securities
Assets:
Investment securities, available-for-sale	202	807
Total debt securities
Assets:
Investment securities, available-for-sale	889,290	842,265
Marketable equity securities
Assets:
Investment securities, available-for-sale	4,683	8,202
Total
Assets:
Investment securities, available-for-sale	893,973	850,467
Mortgages held for sale	11,000	15,849
Level 1
Assets:
Investment securities, available-for-sale	24,916	28,366
Mortgages held for sale	0	0
Level 2
Assets:
Investment securities, available-for-sale	865,887	818,595
Mortgages held for sale	11,000	15,849
Level 3
Assets:
Investment securities, available-for-sale	3,170	3,506
Mortgages held for sale	0	0
Recurring basis | Total
Assets:
Investment securities, available-for-sale	893,973	850,467
Mortgages held for sale	11,000	15,849
Total	910,653	872,937
Liabilities:
Total	5,785	6,743
Recurring basis | Total | Interest rate swap contracts
Assets:
Accrued income and other assets	5,680	6,621
Liabilities:
Accrued expenses and other liabilities	5,785	6,743
Recurring basis | Total | U.S. Treasury and Federal agencies securities
Assets:
Investment securities, available-for-sale	457,626	420,833
Recurring basis | Total | U.S. States and political subdivisions securities
Assets:
Investment securities, available-for-sale	123,126	132,975
Recurring basis | Total | Mortgage-backed securities - Federal agencies
Assets:
Investment securities, available-for-sale	276,857	252,574
Recurring basis | Total | Corporate debt securities
Assets:
Investment securities, available-for-sale	31,479	35,076
Recurring basis | Total | Foreign government and other securities
Assets:
Investment securities, available-for-sale	202	807
Recurring basis | Total | Total debt securities
Assets:
Investment securities, available-for-sale	889,290	842,265
Recurring basis | Total | Marketable equity securities
Assets:
Investment securities, available-for-sale	4,683	8,202
Recurring basis | Level 1
Assets:
Investment securities, available-for-sale	24,916	28,366
Mortgages held for sale	0	0
Total	24,916	28,366
Liabilities:
Total	0	0
Recurring basis | Level 1 | Interest rate swap contracts
Assets:
Accrued income and other assets	0	0
Liabilities:
Accrued expenses and other liabilities	0	0
Recurring basis | Level 1 | U.S. Treasury and Federal agencies securities
Assets:
Investment securities, available-for-sale	20,233	20,164
Recurring basis | Level 1 | U.S. States and political subdivisions securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 1 | Mortgage-backed securities - Federal agencies
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 1 | Corporate debt securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 1 | Foreign government and other securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 1 | Total debt securities
Assets:
Investment securities, available-for-sale	20,233	20,164
Recurring basis | Level 1 | Marketable equity securities
Assets:
Investment securities, available-for-sale	4,683	8,202
Recurring basis | Level 2
Assets:
Investment securities, available-for-sale	865,887	818,595
Mortgages held for sale	11,000	15,849
Total	882,567	841,065
Liabilities:
Total	5,785	6,743
Recurring basis | Level 2 | Interest rate swap contracts
Assets:
Accrued income and other assets	5,680	6,621
Liabilities:
Accrued expenses and other liabilities	5,785	6,743
Recurring basis | Level 2 | U.S. Treasury and Federal agencies securities
Assets:
Investment securities, available-for-sale	437,393	400,669
Recurring basis | Level 2 | U.S. States and political subdivisions securities
Assets:
Investment securities, available-for-sale	120,158	130,276
Recurring basis | Level 2 | Mortgage-backed securities - Federal agencies
Assets:
Investment securities, available-for-sale	276,857	252,574
Recurring basis | Level 2 | Corporate debt securities
Assets:
Investment securities, available-for-sale	31,479	35,076
Recurring basis | Level 2 | Foreign government and other securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 2 | Total debt securities
Assets:
Investment securities, available-for-sale	865,887	818,595
Recurring basis | Level 2 | Marketable equity securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 3
Assets:
Investment securities, available-for-sale	3,170	3,506
Mortgages held for sale	0	0
Total	3,170	3,506
Liabilities:
Total	0	0
Recurring basis | Level 3 | Interest rate swap contracts
Assets:
Accrued income and other assets	0	0
Liabilities:
Accrued expenses and other liabilities	0	0
Recurring basis | Level 3 | U.S. Treasury and Federal agencies securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 3 | U.S. States and political subdivisions securities
Assets:
Investment securities, available-for-sale	2,968	2,699
Recurring basis | Level 3 | Mortgage-backed securities - Federal agencies
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 3 | Corporate debt securities
Assets:
Investment securities, available-for-sale	0	0
Recurring basis | Level 3 | Foreign government and other securities
Assets:
Investment securities, available-for-sale	202	807
Recurring basis | Level 3 | Total debt securities
Assets:
Investment securities, available-for-sale	3,170	3,506
Recurring basis | Level 3 | Marketable equity securities
Assets:
Investment securities, available-for-sale	$ 0	$ 0

Fair Value Measurements (Deta57

Fair Value Measurements (Details 3) $ in Thousands	3 Months Ended
	Sep. 30, 2017USD ($)item	Sep. 30, 2016USD ($)item
Changes in the fair value of Level 3 assets measured on a recurring basis
Total gains or losses (unrealized): included in earnings	$ 0	$ 0
Number of transfers between levels | item	0	0
U.S. States and political subdivisions securities
Changes in the fair value of Level 3 assets measured on a recurring basis
Balance at the beginning of the period	$ 1,801	$ 4,661
Total gains or losses (realized/unrealized): included in earnings	0	0
Total gains or losses (realized/unrealized): included in other comprehensive income	17	(16)
Purchases	1,150	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Maturities	0	(662)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at the end of the period	2,968	3,983
Foreign government and other securities
Changes in the fair value of Level 3 assets measured on a recurring basis
Balance at the beginning of the period	302	810
Total gains or losses (realized/unrealized): included in earnings	0	0
Total gains or losses (realized/unrealized): included in other comprehensive income	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Maturities	(100)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at the end of the period	202	810
Investment securities available-for-sale
Changes in the fair value of Level 3 assets measured on a recurring basis
Balance at the beginning of the period	2,103	5,471
Total gains or losses (realized/unrealized): included in earnings	0	0
Total gains or losses (realized/unrealized): included in other comprehensive income	17	(16)
Purchases	1,150	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Maturities	(100)	(662)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance at the end of the period	$ 3,170	$ 4,793

Fair Value Measurements (Deta58

Fair Value Measurements (Details 4) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Valuation Methodology
Investment securities, available-for-sale	$ 893,973	$ 850,467
Level 3
Valuation Methodology
Investment securities, available-for-sale	3,170	3,506
Recurring | Level 3
Valuation Methodology
Investment securities, available-for-sale	3,170	3,506
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities
Valuation Methodology
Investment securities, available-for-sale	$ 2,968	$ 2,699
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Minimum
Unobservable Inputs
Credit spread assumption (as a percent)	1.74%	0.92%
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Maximum
Unobservable Inputs
Credit spread assumption (as a percent)	2.64%	3.17%
Recurring | Level 3 | Discounted cash flows | Foreign government
Valuation Methodology
Investment securities, available-for-sale	$ 202	$ 807
Recurring | Level 3 | Discounted cash flows | Foreign government | Minimum
Unobservable Inputs
Market yield assumption (as a percent)	0.50%	0.28%
Recurring | Level 3 | Discounted cash flows | Foreign government | Maximum
Unobservable Inputs
Market yield assumption (as a percent)	0.61%	1.12%
Non-recurring | Level 3 | Commercial loans
Unobservable Inputs
Discount rate (as a percent)	20.00%
Non-recurring | Level 3 | Minimum | Commercial loans
Unobservable Inputs
Discount rate (as a percent)	40.00%
Non-recurring | Level 3 | Maximum | Commercial loans
Unobservable Inputs
Discount rate (as a percent)	75.00%
Non-recurring | Level 3 | Trade publications | Aircraft
Unobservable Inputs
Discount rate (as a percent)	10.00%
Non-recurring | Level 3 | Auction values | Autos
Unobservable Inputs
Discount rate (as a percent)	10.00%
Non-recurring | Level 3 | Trade publications and auction values | Medium and heavy duty trucks
Unobservable Inputs
Discount rate (as a percent)	15.00%
Non-recurring | Level 3 | Trade publications and auction values | Construction equipment
Unobservable Inputs
Discount rate (as a percent)	20.00%
Non-recurring | Level 3 | Appraisals | Real estate
Unobservable Inputs
Discount rate (as a percent)	20.00%

Fair Value Measurements (Deta59

Fair Value Measurements (Details 5) - Non-recurring - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Impaired loans
Fair value measurements
Impairment charges (recoveries)	$ 240
Partnership investments
Fair value measurements
Impairment charges (recoveries)	0
Mortgage servicing rights
Fair value measurements
Impairment charges (recoveries)	0
Repossessions
Fair value measurements
Impairment charges (recoveries)	490
Other real estate
Fair value measurements
Impairment charges (recoveries)	0
Total
Fair value measurements
Impaired loans - collateral based	3,841	$ 6,280
Assets measured at fair value	23,488	21,686
Total | Partnership investments
Fair value measurements
Accrued income and other assets	1,033	1,032
Total | Mortgage servicing rights
Fair value measurements
Accrued income and other assets	4,360	4,297
Total | Repossessions
Fair value measurements
Accrued income and other assets	12,913	9,373
Total | Other real estate
Fair value measurements
Accrued income and other assets	1,341	704
Level 3
Fair value measurements
Impaired loans - collateral based	3,841	6,280
Assets measured at fair value	23,488	21,686
Level 3 | Partnership investments
Fair value measurements
Accrued income and other assets	1,033	1,032
Level 3 | Mortgage servicing rights
Fair value measurements
Accrued income and other assets	4,360	4,297
Level 3 | Repossessions
Fair value measurements
Accrued income and other assets	12,913	9,373
Level 3 | Other real estate
Fair value measurements
Accrued income and other assets	$ 1,341	$ 704

Fair Value Measurements (Deta60

Fair Value Measurements (Details 6) - Non-recurring - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Level 3
Valuation Methodology
Assets measured at fair value	$ 23,488	$ 21,686
Level 3 | Collateral based measurements | Impaired loans | Minimum
Unobservable Inputs
Discount for lack of marketability and current conditions (as a percent)	15.00%	0.00%
Level 3 | Collateral based measurements | Impaired loans | Maximum
Unobservable Inputs
Discount for lack of marketability and current conditions (as a percent)	20.00%	100.00%
Level 3 | Discounted cash flows | Mortgage servicing rights | Minimum
Unobservable Inputs
Constant prepayment rate (CPR) (as a percent)	9.10%	8.60%
Discount rate (as a percent)	9.50%	9.60%
Level 3 | Discounted cash flows | Mortgage servicing rights | Maximum
Unobservable Inputs
Constant prepayment rate (CPR) (as a percent)	18.80%	15.00%
Discount rate (as a percent)	12.40%	12.50%
Level 3 | Appraisals trade publications and auction values | Repossessions | Minimum
Unobservable Inputs
Discount for lack of marketability (as a percent)	3.00%	0.00%
Level 3 | Appraisals trade publications and auction values | Repossessions | Maximum
Unobservable Inputs
Discount for lack of marketability (as a percent)	10.00%	4.00%
Level 3 | Appraisals | Other real estate | Minimum
Unobservable Inputs
Discount for lack of marketability (as a percent)	0.00%	0.00%
Level 3 | Appraisals | Other real estate | Maximum
Unobservable Inputs
Discount for lack of marketability (as a percent)	10.00%	16.00%
Carrying Value | Level 3 | Collateral based measurements | Impaired loans
Valuation Methodology
Assets measured at fair value	$ 3,841	$ 6,280
Carrying Value | Level 3 | Discounted cash flows | Mortgage servicing rights
Valuation Methodology
Assets measured at fair value	4,360	4,297
Carrying Value | Level 3 | Appraisals trade publications and auction values | Repossessions
Valuation Methodology
Assets measured at fair value	12,913	9,373
Carrying Value | Level 3 | Appraisals | Other real estate
Valuation Methodology
Assets measured at fair value	1,341	704
Fair Value
Valuation Methodology
Assets measured at fair value	23,488	21,686
Fair Value | Level 3 | Collateral based measurements | Impaired loans
Valuation Methodology
Assets measured at fair value	3,841	6,280
Fair Value | Level 3 | Discounted cash flows | Mortgage servicing rights
Valuation Methodology
Assets measured at fair value	7,097	7,484
Fair Value | Level 3 | Appraisals trade publications and auction values | Repossessions
Valuation Methodology
Assets measured at fair value	13,410	9,452
Fair Value | Level 3 | Appraisals | Other real estate
Valuation Methodology
Assets measured at fair value	$ 1,401	$ 752

Fair Value Measurements (Deta61

Fair Value Measurements (Details 7) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Cash and due from banks	$ 64,636	$ 58,578
Federal funds sold and interest bearing deposits with other banks	34,788	49,726
Investment securities, available-for-sale	893,973	850,467
Other investments	25,953	22,458
Mortgages held for sale	11,000	15,849
Loans and leases, net of reserve for loan and lease losses	4,343,346	4,099,528
Liabilities:
Long-term debt and mandatorily redeemable securities	70,482	74,308
Subordinated notes	58,764	58,764
Carrying or Contract Value
Assets:
Cash and due from banks	64,636	58,578
Federal funds sold and interest bearing deposits with other banks	34,788	49,726
Investment securities, available-for-sale	893,973	850,467
Other investments	25,953	22,458
Mortgages held for sale	11,000	15,849
Loans and leases, net of reserve for loan and lease losses	4,343,346	4,099,528
Mortgage servicing rights	4,360	4,297
Interest rate swaps	5,680	6,621
Liabilities:
Deposits	4,573,712	4,333,760
Short-term borrowings	316,765	291,943
Long-term debt and mandatorily redeemable securities	70,482	74,308
Subordinated notes	58,764	58,764
Interest rate swaps	5,785	6,743
Off-balance-sheet instruments	0	0
Fair Value
Assets:
Cash and due from banks	64,636	58,578
Federal funds sold and interest bearing deposits with other banks	34,788	49,726
Investment securities, available-for-sale	893,973	850,467
Other investments	25,953	22,458
Mortgages held for sale	11,000	15,849
Loans and leases, net of reserve for loan and lease losses	4,343,808	4,107,079
Mortgage servicing rights	7,097	7,484
Interest rate swaps	5,680	6,621
Liabilities:
Deposits	4,571,242	4,332,744
Short-term borrowings	316,765	291,943
Long-term debt and mandatorily redeemable securities	69,221	73,149
Subordinated notes	56,048	51,031
Interest rate swaps	5,785	6,743
Off-balance-sheet instruments	300	382
Level 1
Assets:
Cash and due from banks	64,636	58,578
Federal funds sold and interest bearing deposits with other banks	34,788	49,726
Investment securities, available-for-sale	24,916	28,366
Other investments	25,953	22,458
Mortgages held for sale	0	0
Loans and leases, net of reserve for loan and lease losses	0	0
Mortgage servicing rights	0	0
Interest rate swaps	0	0
Liabilities:
Deposits	3,337,440	3,277,108
Short-term borrowings	148,771	163,652
Long-term debt and mandatorily redeemable securities	0	0
Subordinated notes	0	0
Interest rate swaps	0	0
Off-balance-sheet instruments	0	0
Level 2
Assets:
Cash and due from banks	0	0
Federal funds sold and interest bearing deposits with other banks	0	0
Investment securities, available-for-sale	865,887	818,595
Other investments	0	0
Mortgages held for sale	11,000	15,849
Loans and leases, net of reserve for loan and lease losses	0	0
Mortgage servicing rights	0	0
Interest rate swaps	5,680	6,621
Liabilities:
Deposits	1,233,802	1,055,636
Short-term borrowings	167,994	128,291
Long-term debt and mandatorily redeemable securities	69,221	73,149
Subordinated notes	56,048	51,031
Interest rate swaps	5,785	6,743
Off-balance-sheet instruments	300	382
Level 3
Assets:
Cash and due from banks	0	0
Federal funds sold and interest bearing deposits with other banks	0	0
Investment securities, available-for-sale	3,170	3,506
Other investments	0	0
Mortgages held for sale	0	0
Loans and leases, net of reserve for loan and lease losses	4,343,808	4,107,079
Mortgage servicing rights	7,097	7,484
Interest rate swaps	0	0
Liabilities:
Deposits	0	0
Short-term borrowings	0	0
Long-term debt and mandatorily redeemable securities	0	0
Subordinated notes	0	0
Interest rate swaps	0	0
Off-balance-sheet instruments	$ 0	$ 0