NBT Bancorp (NBTB) 10-Q 9 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	NBT BANCORP INC
Entity Central Index Key	790,359
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,510,687
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 155,236	$ 147,789
Short-term interest bearing accounts	8,694	1,392
Securities available for sale, at fair value	1,365,521	1,338,290
Securities held to maturity (fair value $516,656 and $525,050, respectively)	515,628	527,948
Trading securities	10,406	9,259
Federal Reserve and Federal Home Loan Bank stock	53,040	47,033
Loans	6,367,911	6,198,057
Less allowance for loan losses	66,600	65,200
Net loans	6,301,311	6,132,857
Premises and equipment, net	82,185	84,187
Goodwill	268,043	265,439
Intangible assets, net	16,904	15,815
Bank owned life insurance	170,641	168,012
Other assets	128,809	129,247
Total assets	9,076,418	8,867,268
Liabilities
Demand (noninterest bearing)	2,220,256	2,195,845
Savings, negotiable order withdrawal and money market	3,962,579	3,905,432
Time	832,449	872,411
Total deposits	7,015,284	6,973,688
Short-term borrowings	831,185	681,703
Long-term debt	88,958	104,087
Junior subordinated debt	101,196	101,196
Other liabilities	99,434	93,278
Total liabilities	8,136,057	7,953,952
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at June 30, 2017 and December 31, 2016	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at June 30, 2017 and December 31, 2016; issued 49,651,493 at June 30, 2017 and December 31, 2016	497	497
Additional paid-in-capital	573,109	575,078
Retained earnings	523,260	501,761
Accumulated other comprehensive loss	(17,891)	(21,520)
Common stock in treasury, at cost, 6,141,431 and 6,393,743 shares at June 30, 2017 and December 31, 2016, respectively	(138,614)	(142,500)
Total stockholders' equity	940,361	913,316
Total liabilities and stockholders' equity	$ 9,076,418	$ 8,867,268

Consolidated Balance Sheets (u3

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Securities held to maturity fair value	$ 516,656	$ 525,050
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,500,000	2,500,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	49,651,493	49,651,493
Common stock in treasury, at cost (in shares)	6,141,431	6,393,743

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest, fee and dividend income
Interest and fees on loans	$ 65,286	$ 62,449	$ 129,313	$ 123,679
Securities available for sale	7,218	5,976	14,227	11,963
Securities held to maturity	2,736	2,496	5,517	4,784
Other	654	454	1,273	903
Total interest, fee and dividend income	75,894	71,375	150,330	141,329
Interest expense
Deposits	3,536	3,605	7,010	7,202
Short-term borrowings	1,366	579	2,505	907
Long-term debt	599	773	1,205	1,606
Junior subordinated debt	772	641	1,498	1,260
Total interest expense	6,273	5,598	12,218	10,975
Net interest income	69,621	65,777	138,112	130,354
Provision for loan losses	7,567	4,780	14,946	10,878
Net interest income after provision for loan losses	62,054	60,997	123,166	119,476
Noninterest income
Insurance and other financial services revenue	5,621	5,625	12,391	12,571
Service charges on deposit accounts	4,161	4,166	8,138	8,105
ATM and debit card fees	5,518	4,934	10,468	9,517
Retirement plan administration fees	5,437	4,054	9,609	7,808
Trust	5,161	4,937	9,693	9,313
Bank owned life insurance	1,218	1,271	2,629	2,562
Net securities gains	2	1	2	30
Other	3,186	4,626	6,124	8,075
Total noninterest income	30,304	29,614	59,054	57,981
Noninterest expense
Salaries and employee benefits	32,754	32,931	66,341	65,372
Occupancy	5,184	5,254	11,354	10,745
Data processing and communications	4,229	4,121	8,427	8,171
Professional fees and outside services	3,609	3,331	6,641	6,562
Equipment	3,793	3,547	7,491	7,007
Office supplies and postage	1,640	1,676	3,248	3,223
FDIC expenses	1,136	1,293	2,314	2,551
Advertising	656	595	1,046	1,099
Amortization of intangible assets	1,039	928	2,006	2,024
Loan collection and other real estate owned, net	664	845	1,943	1,550
Other	5,617	5,924	10,792	10,365
Total noninterest expense	60,321	60,445	121,603	118,669
Income before income tax expense	32,037	30,166	60,617	58,788
Income tax expense	10,678	10,257	18,979	19,988
Net income	$ 21,359	$ 19,909	$ 41,638	$ 38,800
Earnings per share
Basic (in dollars per share)	$ 0.49	$ 0.46	$ 0.96	$ 0.90
Diluted (in dollars per share)	$ 0.49	$ 0.46	$ 0.95	$ 0.89

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 21,359	$ 19,909	$ 41,638	$ 38,800
Other comprehensive income, net of tax:
Unrealized net holding gains arising during the period (pre-tax amounts of $2,528, $3,730, $3,364 and $16,941)	1,562	2,278	2,059	10,350
Reclassification adjustment for net (gains) related to securities available for sale included in net income (pre-tax amounts of $2, $1, $2 and $30)	(1)	0	(1)	(19)
Reclassification adjustment for an impairment write-down of equity security (pre-tax amounts of $-, $-, $1,312 and $-)	0	0	811	0
Unrealized gains on derivatives (cash flow hedges) (pre-tax amounts of ($434), ($62), ($104) and ($62))	(268)	(38)	(64)	(38)
Amortization of unrealized net gains related to the reclassification of available for sale investment securities to held to maturity (pre-tax amounts of $225, $280, $463 and $576)	139	171	286	352
Pension and other benefits:
Amortization of prior service cost and actuarial loss (pre-tax amounts of $435, $513, $870 and $1,024)	269	313	538	626
Total other comprehensive income	1,701	2,724	3,629	11,271
Comprehensive income	$ 23,060	$ 22,633	$ 45,267	$ 50,071

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other comprehensive income, net of tax:
Unrealized net holding gains arising during the period, pre-tax amounts	$ 2,528	$ 3,730	$ 3,364	$ 16,941
Reclassification adjustment for net (gains) related to securities available for sale included in net income, pre-tax amounts	2	1	2	30
Reclassification adjustment for an impairment write-down of equity security, pre-tax amounts	0	0	1,312	0
Unrealized loss on derivatives (cash flow hedged) (pre-tax amounts)	(434)	(62)	(104)	(62)
Amortization of unrealized net gains related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts	225	280	463	576
Amortization of prior service cost and actuarial loss, pre-tax amounts	$ 435	$ 513	$ 870	$ 1,024

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Common Stock in Treasury [Member]	Total
Balance at Dec. 31, 2015	$ 497	$ 576,726	$ 462,232	$ (22,418)	$ (135,033)	$ 882,004
Net income	0	0	38,800	0	0	38,800
Cash dividends	0	0	(18,958)	0	0	(18,958)
Purchase of treasury shares	0	0	0	0	(17,193)	(17,193)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(5,945)	0	0	4,088	(1,857)
Stock-based compensation	0	2,286	0	0	0	2,286
Other comprehensive income	0	0	0	11,271	0	11,271
Balance at Jun. 30, 2016	497	573,067	482,074	(11,147)	(148,138)	896,353
Balance at Dec. 31, 2016	497	575,078	501,761	(21,520)	(142,500)	913,316
Net income	0	0	41,638	0	0	41,638
Cash dividends	0	0	(20,044)	0	0	(20,044)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(4,702)	0	0	3,886	(816)
Stock-based compensation	0	2,733	(95)	0	0	2,638
Other comprehensive income	0	0	0	3,629	0	3,629
Balance at Jun. 30, 2017	$ 497	$ 573,109	$ 523,260	$ (17,891)	$ (138,614)	$ 940,361

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.46	$ 0.44
Purchase of treasury shares (in shares)		675,535
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit (in shares)	252,312	237,824

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 41,638	$ 38,800
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	14,946	10,878
Depreciation and amortization of premises and equipment	4,488	4,511
Net accretion on securities	2,430	1,816
Amortization of intangible assets	2,006	2,024
Excess tax benefit on stock-based compensation	1,526	0
Stock based compensation	2,638	2,286
Bank owned life insurance income	(2,629)	(2,562)
Trading securities purchases	(1,293)	(270)
Losses on trading securities	145	56
Proceeds from sales of loans held for sale	60,650	44,598
Originations and purchases of loans held for sale	(62,163)	(47,298)
Net gains on sales of loans held for sale	(223)	(227)
Net security (gains)	(2)	(30)
Net (gain) on sales of other real estate owned	(704)	(528)
Impairment write-down	1,312	0
Net (increase) in other assets	(3,261)	(6,890)
Net increase in other liabilities	4,405	2,892
Net cash provided by operating activities	65,909	50,056
Investing activities
Net cash used in acquisitions	(4,000)	0
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	136,898	161,017
Purchases	(162,723)	(238,610)
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	52,883	41,440
Proceeds from sales	764	0
Purchases	(41,334)	(70,065)
Other:
Net increase in loans	(186,546)	(164,269)
Proceeds from Federal Home Loan Bank stock redemption	112,841	64,194
Purchases of Federal Reserve and Federal Home Loan Bank stock	(118,848)	(72,781)
Proceeds from settlement of bank owned life insurance	0	1,457
Purchase of bank owned life insurance	0	(45,000)
Purchases of premises and equipment, net	(2,604)	(2,083)
Proceeds from the sales of other real estate owned	6,420	4,583
Net cash used in investing activities	(206,249)	(320,117)
Financing activities
Net increase in deposits	41,596	135,573
Net increase in short-term borrowings	149,482	223,943
Repayments of long-term debt	(15,129)	(20,141)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	2,007	986
Cash paid by employer for tax-withholding on stock issuance	(2,823)	(2,843)
Purchase of treasury stock	0	(17,193)
Cash dividends	(20,044)	(18,958)
Net cash provided by financing activities	155,089	301,367
Net increase in cash and cash equivalents	14,749	31,306
Cash and cash equivalents at beginning of period	149,181	140,297
Cash and cash equivalents at end of period	163,930	171,603
Cash paid during the period for:
Interest	12,404	10,926
Income taxes paid	12,886	20,809
Noncash investing activities:
Loans transferred to other real estate owned	4,882	1,608
Acquisitions:
Fair value of assets acquired	$ 3,096	$ 0

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2017
Description of Business [Abstract]
Description of Business	1. Description of Business NBT Bancorp Inc. (the “Registrant” or the “Company”) is a registered financial holding company incorporated in the state of Delaware in 1986, with its principal headquarters located in Norwich, New York. The principal assets of the Registrant consist of all of the outstanding shares of common stock of its subsidiaries, including: NBT Bank, National Association (the “Bank”), NBT Financial Services, Inc. (“NBT Financial”), NBT Holdings, Inc. (“NBT Holdings”), Hathaway Agency, Inc. and CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I and Alliance Financial Capital Trust II (collectively, the “Trusts”). The Company’s principal sources of revenue are the management fees and dividends it receives from the Bank, NBT Financial and NBT Holdings. The Company’s business, primarily conducted through the Bank but also through its other subsidiaries, consists of providing commercial banking and financial services to customers in its market area, which includes central and upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont and the greater Portland, Maine area. The Company has been and intends to continue to be, a community-oriented financial institution offering a variety of financial services. The Company’s business philosophy is to operate as a community bank with local decision-making, principally in non-metropolitan markets, providing a broad array of banking and financial services to retail, commercial and municipal customers.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Basis of Presentation [Abstract]
Basis of Presentation	2. Basis of Presentation The accompanying unaudited interim consolidated financial statements include the accounts of the Registrant and its wholly owned subsidiaries, the Bank, NBT Financial and NBT Holdings. Collectively, the Registrant and its subsidiaries are referred to herein as “the Company.” The interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods in accordance with generally accepted accounting principles in the United States of America (“GAAP”). These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our 2016 Annual Report on Form 10-K. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. All intercompany transactions have been eliminated in consolidation. Amounts in the prior period financial statements are reclassified whenever necessary to conform to current period presentation. The Company has evaluated subsequent events for potential recognition and/or disclosure and there were none identified.

Securities

Securities	6 Months Ended
	Jun. 30, 2017
Securities [Abstract]
Securities	3. Securities The amortized cost, estimated fair value and unrealized gains and losses of available for sale ("AFS") securities are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value June 30, 2017 Federal agency $ 159,999 $ 46 $ 525 $ 159,520 State & municipal 44,023 136 139 44,020 Mortgage-backed: Government-sponsored enterprises 544,616 3,503 1,414 546,705 U.S. government agency securities 17,167 406 217 17,356 Collateralized mortgage obligations: Government-sponsored enterprises 528,561 622 5,551 523,632 U.S. government agency securities 55,713 191 628 55,276 Other securities 13,537 5,614 139 19,012 Total securities AFS $ 1,363,616 $ 10,518 $ 8,613 $ 1,365,521 December 31, 2016 Federal agency $ 175,135 $ 78 $ 805 $ 174,408 State & municipal 47,053 153 480 46,726 Mortgage-backed: Government-sponsored enterprises 513,814 3,345 2,492 514,667 U.S. government agency securities 14,955 411 189 15,177 Collateralized mortgage obligations: Government-sponsored enterprises 513,431 532 7,688 506,275 U.S. government agency securities 60,822 184 708 60,298 Other securities 15,849 6,394 1,504 20,739 Total securities AFS $ 1,341,059 $ 11,097 $ 13,866 $ 1,338,290 The amortized cost, estimated fair value and unrealized gains and losses of held to maturity ("HTM") securities are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value June 30, 2017 Mortgage-backed: Government-sponsored enterprises $ 102,651 $ 61 $ 878 $ 101,834 U.S. government agency securities 474 69 - 543 Collateralized mortgage obligations: Government-sponsored enterprises 205,806 1,280 1,068 206,018 State & municipal 206,697 2,097 533 208,261 Total securities HTM $ 515,628 $ 3,507 $ 2,479 $ 516,656 December 31, 2016 Mortgage-backed: Government-sponsored enterprises $ 96,668 $ - $ 1,176 $ 95,492 U.S. government agency securities 533 87 - 620 Collateralized mortgage obligations: Government-sponsored enterprises 225,213 1,060 1,508 224,765 State & municipal 205,534 434 1,795 204,173 Total securities HTM $ 527,948 $ 1,581 $ 4,479 $ 525,050 Securities with amortized costs totaling $1.5 billion at June 30, 2017 and December 31, 2016 were pledged to secure public deposits and for other purposes required or permitted by law. At June 30, 2017 and December 31, 2016, securities with an amortized cost of $234.4 million and $235.6 million, respectively, were pledged as collateral for securities sold under repurchase agreements. The following table sets forth information with regard to investment securities with unrealized losses segregated according to the length of time the securities had been in a continuous unrealized loss position: (Dollars in thousands) Less than 12 months 12 months or longer Total Security Type: Fair Value Unrealized losses Number of Positions Fair Value Unrealized losses Number of Positions Fair Value Unrealized losses Number of Positions June 30, 2017 AFS securities: Federal agency $ 109,778 $ (525 ) 9 $ - $ - - $ 109,778 $ (525 ) 9 State & municipal 23,771 (120 ) 36 1,052 (19 ) 1 24,823 (139 ) 37 Mortgage-backed 210,648 (1,618 ) 46 963 (13 ) 4 211,611 (1,631 ) 50 Collateralized mortgage obligations 452,830 (6,091 ) 61 6,347 (88 ) 2 459,177 (6,179 ) 63 Other securities 1,990 (10 ) 1 2,976 (129 ) 1 4,966 (139 ) 2 Total securities with unrealized losses $ 799,017 $ (8,364 ) 153 $ 11,338 $ (249 ) 8 $ 810,355 $ (8,613 ) 161 HTM securities: Mortgage-backed $ 52,892 $ (878 ) 4 $ - $ - - $ 52,892 $ (878 ) 4 Collateralized mortgage obligations 40,458 (148 ) 6 32,969 (920 ) 4 73,427 (1,068 ) 10 State & municipal 24,400 (397 ) 36 2,688 (136 ) 5 27,088 (533 ) 41 Total securities with unrealized losses $ 117,750 $ (1,423 ) 46 $ 35,657 $ (1,056 ) 9 $ 153,407 $ (2,479 ) 55 December 31, 2016 AFS securities: Federal agency $ 119,363 $ (805 ) 10 $ - $ - - $ 119,363 $ (805 ) 10 State & municipal 31,873 (478 ) 55 483 (2 ) 1 32,356 (480 ) 56 Mortgage-backed 277,524 (2,668 ) 49 985 (13 ) 4 278,509 (2,681 ) 53 Collateralized mortgage obligations 473,746 (8,396 ) 57 - - - 473,746 (8,396 ) 57 Other securities - - - 4,363 (1,504 ) 2 4,363 (1,504 ) 2 Total securities with unrealized losses $ 902,506 $ (12,347 ) 171 $ 5,831 $ (1,519 ) 7 $ 908,337 $ (13,866 ) 178 HTM securities: Mortgage-backed $ 95,492 $ (1,176 ) 5 $ - $ - - $ 95,492 $ (1,176 ) 5 Collateralized mortgage obligations 108,587 (319 ) 12 35,209 (1,189 ) 4 143,796 (1,508 ) 16 State & municipal 81,984 (1,795 ) 155 - - - 81,984 (1,795 ) 155 Total securities with unrealized losses $ 286,063 $ (3,290 ) 172 $ 35,209 $ (1,189 ) 4 $ 321,272 $ (4,479 ) 176 Declines in the fair value of HTM and AFS securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses or in other comprehensive income. Depending on whether the Company intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment ("OTTI") shall be recognized in earnings equal to the entire difference between the investment's amortized cost basis and its fair value at the balance sheet date. If the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the OTTI shall be separated into (a) the amount representing the credit loss and (b) the amount related to all other factors. The amount of the total OTTI related to the credit loss shall be recognized in earnings. The amount of the total OTTI related to other factors shall be recognized in other comprehensive income, net of applicable taxes. In estimating OTTI losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer and (iii) the historical and implied volatility of the fair value of the security. Management has the intent to hold the securities classified as HTM until they mature, at which time it is believed the Company will receive full value for the securities. The unrealized losses on HTM debt securities are due to increases in market interest rates over yields at the time the underlying securities were purchased. When necessary, the Company has performed a discounted cash flow analysis to determine whether or not it will receive the contractual principal and interest on certain securities. The fair value is expected to recover as the bond approaches their maturity date or repricing date or if market yields for such investments decline. Management also has the intent to hold and will not be required to sell, the securities classified as AFS for a period of time sufficient for a recovery of cost, which may be until maturity. The unrealized losses on AFS debt securities are due to increases in market interest rates over the yields available at the time the underlying securities were purchased. When necessary, the Company has performed a discounted cash flow analysis to determine whether or not it will receive the contractual principal and interest on certain securities. For AFS debt and equity securities, OTTI losses are recognized in earnings if the Company intends to sell the security. In other cases the Company considers the relevant factors noted above, as well as the Company's intent and ability to retain its investment for a period of time sufficient to allow for any anticipated recovery in market value and whether evidence exists to support a realizable value equal to or greater than the cost basis. Any impairment loss on an equity security is equal to the full difference between the cost basis and the fair value of the security. As of June 30, 2017 and December 31, 2016, management believes the impairments detailed in the table above are temporary. There were no impairments realized in the three months ended June 30, 2017. For the six months ended June 30, 2017, $1.3 million of an OTTI loss on an AFS equity investment was realized in the Company's unaudited interim consolidated statements of income. There were no OTTI losses realized in the Company's unaudited interim consolidated statements of income for the three and six month periods ended June 30, 2016. During the three and six months ended June 30, 2017, the Company sold HTM securities with an amortized cost of $0.8 million and an unrealized loss of $2 thousand. Due to significant deterioration in the creditworthiness of the issuers of the HTM securities, the circumstances caused the Company to change its intent to hold the HTM securities sold to maturity, which did not affect the Company's intent to hold the remainder of the HTM portfolio to maturity. There were no sales of HTM securities in the three or six month periods ended June 30, 2016. The following tables set forth information with regard to contractual maturities of debt securities at June 30, 2017: (In thousands) Amortized cost Estimated fair value AFS debt securities: Within one year $ 63,613 $ 63,631 From one to five years 136,121 136,321 From five to ten years 163,507 164,061 After ten years 986,838 982,496 $ 1,350,079 $ 1,346,509 HTM debt securities: Within one year $ 34,486 $ 34,493 From one to five years 38,026 38,392 From five to ten years 122,400 123,545 After ten years 320,716 320,226 $ 515,628 $ 516,656 Maturities of mortgage-backed, collateralized mortgage obligations and asset-backed securities are stated based on their estimated average lives. Actual maturities may differ from estimated average lives or contractual maturities because, in certain cases, borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Except for U.S. Government securities, there were no holdings, when taken in the aggregate, of any single issuer that exceeded 10% of consolidated stockholders’ equity at June 30, 2017 and December 31, 2016.

Allowance for Loan Losses and C

Allowance for Loan Losses and Credit Quality of Loans	6 Months Ended
	Jun. 30, 2017
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Allowance for Loan Losses and Credit Quality of Loans	4. Allowance for Loan Losses and Credit Quality of Loans Allowance for Loan Losses The allowance for loan losses is maintained at a level estimated by management to provide adequately for probable incurred losses inherent in the current loan portfolio. The appropriateness of the allowance for loan losses is continuously monitored. It is assessed for appropriateness using a methodology designed to ensure the level of the allowance reasonably reflects the loan portfolio’s risk profile. It is evaluated to ensure that it is sufficient to absorb all reasonably estimable credit losses inherent in the current loan portfolio. To develop and document a systematic methodology for determining the allowance for loan losses, the Company has divided the loan portfolio into three segments, each with different risk characteristics and methodologies for assessing risk. Those segments are further segregated between our loans accounted for under the amortized cost method (referred to as “originated” loans) and loans acquired in a business combination (referred to as “acquired” loans). Each portfolio segment is broken down into class segments where appropriate. Class segments contain unique measurement attributes, risk characteristics and methods for monitoring and assessing risk that are necessary to develop the allowance for loan losses. Unique characteristics such as borrower type, loan type, collateral type and risk characteristics define each class segment. The following table illustrates the portfolio and class segments for the Company’s loan portfolio: Portfolio Class Commercial Loans Commercial Commercial Real Estate Agricultural Agricultural Real Estate Business Banking Consumer Loans Indirect Home Equity Direct Residential Real Estate Mortgages Commercial Loans The Company offers a variety of commercial loan products including commercial (non-real estate), commercial real estate, agricultural, agricultural real estate and business banking loans. The Company’s underwriting analysis for commercial loans typically includes credit verification, independent appraisals, a review of the borrower’s financial condition and a detailed analysis of the borrower’s underlying cash flows. Commercial – Commercial Real Estate – Agricultural Agricultural Real Estate Business Banking Consumer Loans The Company offers a variety of consumer loan products including indirect, home equity and direct loans. Indirect – Home Equity Direct – Residential Real Estate Mortgages Residential real estate loans consist primarily of loans secured by first or second deeds of trust on primary residences. We originate adjustable-rate and fixed-rate, one-to-four-family residential real estate loans for the construction, purchase or refinancing of a mortgage. These loans are collateralized by owner-occupied properties located in the Company’s market area. When market conditions are favorable, for longer term, fixed-rate residential mortgages without escrow, the Company retains the servicing, but sells the right to receive principal and interest to Freddie Mac. This practice allows the Company to manage interest rate, liquidity risk and credit risk. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower) or have private mortgage insurance. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. Allowance for Loan Loss Calculation For purposes of evaluating the adequacy of the allowance, the Company considers a number of significant factors that affect the collectability of the portfolio. For individually analyzed loans, these include estimates of loss exposure, which reflect the facts and circumstances that affect the likelihood of repayment of such loans as of the evaluation date. For homogeneous pools of loans, estimates of the Company’s exposure to credit loss reflect a current assessment of a number of factors, which could affect collectability. These factors include: past loss experience, size, trend, composition and nature of loans; changes in lending policies and procedures, including underwriting standards and collection, charge-offs and recoveries; trends experienced in nonperforming and delinquent loans; current economic conditions in the Company’s market; portfolio concentrations that may affect loss experienced across one or more components of the portfolio; the effect of external factors such as competition, legal and regulatory requirements; and the experience, ability and depth of lending management and staff. In addition, various regulatory agencies, as an integral component of their examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to make loan grade changes as well as recognize additions to the allowance based on their examinations. After a thorough consideration of the factors discussed above, any required additions or reductions to the allowance for loan losses are made periodically by charges or credits to the provision for loan losses. These charges are necessary to maintain the allowance at a level that management believes is reflective of overall inherent risk of probable loss in the portfolio. While management uses available information to recognize losses on loans, additions and reductions of the allowance may fluctuate from one reporting period to another. These fluctuations are reflective of changes in risk associated with portfolio content and/or changes in management’s assessment of any or all of the determining factors discussed above. The following tables illustrate the changes in the allowance for loan losses by our portfolio segments: Three months ended June 30, (In thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of March 31, 2017 $ 24,727 $ 34,769 $ 6,204 $ - $ 65,700 Charge-offs (1,123 ) (6,261 ) (698 ) - (8,082 ) Recoveries 206 1,199 10 - 1,415 Provision 618 5,816 1,133 - 7,567 Ending Balance as of June 30, 2017 $ 24,428 $ 35,523 $ 6,649 $ - $ 66,600 Balance as of March 31, 2016 $ 25,299 $ 31,035 $ 7,984 $ - $ 64,318 Charge-offs (649 ) (4,950 ) (268 ) - (5,867 ) Recoveries 339 907 91 - 1,337 Provision 233 4,479 68 - 4,780 Ending Balance as of June 30, 2016 $ 25,222 $ 31,471 $ 7,875 $ - $ 64,568 Six months ended June 30, Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of December 31, 2016 $ 25,444 $ 33,375 $ 6,381 $ - $ 65,200 Charge-offs (2,417 ) (12,763 ) (1,296 ) - (16,476 ) Recoveries 653 2,234 43 - 2,930 Provision 748 12,677 1,521 - 14,946 Ending Balance as of June 30, 2017 $ 24,428 $ 35,523 $ 6,649 $ - $ 66,600 Balance as of December 31, 2015 $ 25,545 $ 29,253 $ 7,960 $ 260 $ 63,018 Charge-offs (1,086 ) (10,363 ) (977 ) - (12,426 ) Recoveries 1,104 1,881 113 - 3,098 Provision (341 ) 10,700 779 (260 ) 10,878 Ending Balance as of June 30, 2016 $ 25,222 $ 31,471 $ 7,875 $ - $ 64,568 For acquired loans, to the extent that we experience deterioration in borrower credit quality resulting in a decrease in our expected cash flows subsequent to the acquisition of the loans, an allowance for loan losses would be established based on our estimate of future credit losses over the remaining life of the loan. There was no allowance for loan losses for the acquired loan portfolio as of June 30, 2017 and $0.8 million as of June 30, 2016. Net charge-offs related to acquired loans totaled approximately $0.3 million and $0.1 million during the three months ended June 30, 2017 and 2016, respectively and approximately $0.7 million and $0.4 million during the six months ended June 30, 2017 and 2016, respectively and are included in the table above. The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments: As of June 30, 2017 (In thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Total Allowance for loan losses $ 24,428 $ 35,523 $ 6,649 $ 66,600 Allowance for loans individually evaluated for impairment 461 - - 461 Allowance for loans collectively evaluated for impairment $ 23,967 $ 35,523 $ 6,649 $ 66,139 Ending balance of loans $ 2,906,314 $ 2,185,790 $ 1,275,807 $ 6,367,911 Ending balance of originated loans individually evaluated for impairment 9,321 8,214 6,429 23,964 Ending balance of acquired loans collectively evaluated for impairment 222,519 52,539 186,214 461,272 Ending balance of originated loans collectively evaluated for impairment $ 2,674,474 $ 2,125,037 $ 1,083,164 $ 5,882,675 As of December 31, 2016 Allowance for loan losses $ 25,444 $ 33,375 $ 6,381 $ 65,200 Allowance for loans individually evaluated for impairment 1,517 - - 1,517 Allowance for loans collectively evaluated for impairment $ 23,927 $ 33,375 $ 6,381 $ 63,683 Ending balance of loans $ 2,786,002 $ 2,149,441 $ 1,262,614 $ 6,198,057 Ending balance of originated loans individually evaluated for impairment 13,070 8,488 6,111 27,669 Ending balance of acquired loans individually evaluated for impairment 1,205 - - 1,205 Ending balance of acquired loans collectively evaluated for impairment 236,413 63,005 199,471 498,889 Ending balance of originated loans collectively evaluated for impairment $ 2,535,314 $ 2,077,948 $ 1,057,032 $ 5,670,294 Credit Quality of Loans For all loan classes within the Company's loan portfolio, loans are placed on nonaccrual status when timely collection of principal and interest in accordance with contractual terms is doubtful. Loans are transferred to nonaccrual status generally when principal or interest payments become ninety days delinquent, unless the loan is well-secured and in the process of collection or sooner when management concludes or circumstances indicate that borrowers may be unable to meet contractual principal or interest payments. When a loan is transferred to a nonaccrual status, all interest previously accrued in the current period but not collected is reversed against interest income in that period. Any payment received on a nonaccrual loan is applied to principal. For all loan classes within the Company's loan portfolio, nonaccrual loans are returned to accrual status when they become current as to principal and interest and demonstrate a period of performance under the contractual terms and, in the opinion of management, are fully collectible as to principal and interest. For loans in all portfolios, the principal amount is charged off in full or in part as soon as management determines, based on available facts, that the collection of principal in full is improbable. For commercial loans, management considers specific facts and circumstances relative to individual credits in making such a determination. For consumer and residential loan classes, management uses specific guidance and thresholds from the Federal Financial Institutions Examination Council’s Uniform Retail Credit Classification and Account Management Policy. The following tables set forth information with regard to past due and nonperforming loans by loan class: As of June 30, 2017 (In thousands) 31-60 Days Past Due Accruing 61-90 Days Past Due Accruing Greater Than 90 Days Past Due Accruing Total Past Due Accruing Nonaccrual Current Recorded Total Loans ORIGINATED Commercial Loans: Commercial $ 35 $ 530 $ - $ 565 $ 5,118 $ 756,087 $ 761,770 Commercial Real Estate 1,621 631 - 2,252 1,928 1,371,367 1,375,547 Agricultural - - - - 630 37,025 37,655 Agricultural Real Estate - - - - 1,696 30,329 32,025 Business Banking 1,637 309 - 1,946 4,379 470,473 476,798 Total Commercial Loans 3,293 1,470 - 4,763 13,751 2,665,281 2,683,795 Consumer Loans: Indirect 16,770 4,188 2,319 23,277 1,835 1,589,934 1,615,046 Home Equity 2,480 701 354 3,535 2,811 448,502 454,848 Direct 197 115 38 350 80 62,927 63,357 Total Consumer Loans 19,447 5,004 2,711 27,162 4,726 2,101,363 2,133,251 Residential Real Estate Mortgages 3,051 974 136 4,161 7,007 1,078,425 1,089,593 Total Originated Loans $ 25,791 $ 7,448 $ 2,847 $ 36,086 $ 25,484 $ 5,845,069 $ 5,906,639 ACQUIRED Commercial Loans: Commercial $ - $ - $ - $ - $ - $ 51,179 $ 51,179 Commercial Real Estate - 294 - 294 619 124,490 125,403 Business Banking 612 - - 612 783 44,542 45,937 Total Commercial Loans 612 294 - 906 1,402 220,211 222,519 Consumer Loans: Indirect 48 3 1 52 37 3,551 3,640 Home Equity 266 63 - 329 183 45,494 46,006 Direct 29 - 1 30 12 2,851 2,893 Total Consumer Loans 343 66 2 411 232 51,896 52,539 Residential Real Estate Mortgages 5 140 - 145 2,016 184,053 186,214 Total Acquired Loans $ 960 $ 500 $ 2 $ 1,462 $ 3,650 $ 456,160 $ 461,272 Total Loans $ 26,751 $ 7,948 $ 2,849 $ 37,548 $ 29,134 $ 6,301,229 $ 6,367,911 As of December 31, 2016 (In thousands) 31-60 Days Past Due Accruing 61-90 Days Past Due Accruing Greater Than 90 Days Past Due Accruing Total Past Due Accruing Nonaccrual Current Recorded Total Loans ORIGINATED Commercial Loans: Commercial $ 33 $ 5 $ - $ 38 $ 2,964 $ 650,568 $ 653,570 Commercial Real Estate - - - - 7,935 1,343,854 1,351,789 Agricultural - - - - 730 37,186 37,916 Agricultural Real Estate - - - - 1,803 30,619 32,422 Business Banking 1,609 318 - 1,927 4,860 465,900 472,687 Total Commercial Loans 1,642 323 - 1,965 18,292 2,528,127 2,548,384 Consumer Loans: Indirect 19,253 4,185 2,499 25,937 2,145 1,538,593 1,566,675 Home Equity 3,416 1,065 528 5,009 2,851 448,797 456,657 Direct 452 125 20 597 107 62,400 63,104 Total Consumer Loans 23,121 5,375 3,047 31,543 5,103 2,049,790 2,086,436 Residential Real Estate Mortgages 2,725 172 1,406 4,303 6,682 1,052,158 1,063,143 Total Originated Loans $ 27,488 $ 5,870 $ 4,453 $ 37,811 $ 30,077 $ 5,630,075 $ 5,697,963 ACQUIRED Commercial Loans: Commercial $ - $ - $ - $ - $ - $ 49,447 $ 49,447 Commercial Real Estate - - - - 1,891 135,398 137,289 Business Banking 236 - - 236 804 49,842 50,882 Total Commercial Loans 236 - - 236 2,695 234,687 237,618 Consumer Loans: Indirect 100 5 - 105 47 8,541 8,693 Home Equity 254 53 30 337 237 50,553 51,127 Direct 30 2 - 32 20 3,133 3,185 Total Consumer Loans 384 60 30 474 304 62,227 63,005 Residential Real Estate Mortgages 609 28 327 964 2,636 195,871 199,471 Total Acquired Loans $ 1,229 $ 88 $ 357 $ 1,674 $ 5,635 $ 492,785 $ 500,094 Total Loans $ 28,717 $ 5,958 $ 4,810 $ 39,485 $ 35,712 $ 6,122,860 $ 6,198,057 There were no material commitments to extend further credit to borrowers with nonperforming loans as of June 30, 2017 and December 31, 2016. Impaired Loans The methodology used to establish the allowance for loan losses on impaired loans incorporates specific allocations on loans analyzed individually. Classified loans, including all trouble debt restructured loans ("TDRs") and nonaccrual commercial loans that are graded Substandard or below, with outstanding balances equal to or greater than $0.8 million are evaluated for impairment through the Company’s quarterly status review process. In determining whether we are able to collect all principal and interest payments due in accordance with the contractual terms of the loan agreements, we consider factors such as payment history and changes in the financial condition of individual borrowers, local economic conditions, historical loss experience and the conditions of the various markets in which the collateral may be liquidated. For loans that are evaluated for impairment, impairment is measured by one of three methods: 1) the fair value of collateral less cost to sell, 2) present value of expected future cash flows or 3) the loan’s observable market price. These impaired loans are reviewed on a quarterly basis for changes in the level of impairment. Any change to the previously recognized impairment loss is recognized as a change to the allowance account and recorded in the unaudited interim consolidated statements of income as a component of the provision for loan losses. The following table provides information on loans specifically evaluated for impairment: June 30, 2017 December 31, 2016 (In thousands) Recorded Investment Balance (Book) Unpaid Principal Balance (Legal) Related Allowance Recorded Investment Balance (Book) Unpaid Principal Balance (Legal) Related Allowance ORIGINATED With no related allowance recorded: Commercial Loans: Commercial $ 3,303 $ 3,436 $ 1,278 $ 1,697 Commercial Real Estate 2,614 2,647 3,816 3,841 Agricultural 115 125 130 137 Agricultural Real Estate 1,476 1,635 1,434 1,567 Business Banking 964 1,056 655 728 Total Commercial Loans 8,472 8,899 7,313 7,970 Consumer Loans: Indirect 31 31 5 16 Home Equity 8,064 8,900 8,483 9,429 Direct 119 119 - - Total Consumer Loans 8,214 9,050 8,488 9,445 Residential Real Estate Mortgages 6,429 7,245 6,111 6,906 Total $ 23,115 $ 25,194 $ 21,912 $ 24,321 With an allowance recorded: Commercial Loans: Commercial 695 700 $ 350 - - $ - Commercial Real Estate 79 83 50 5,553 5,736 735 Agricultural 29 31 30 49 49 37 Agricultural Real Estate 46 48 31 155 155 54 Total Commercial Loans $ 849 $ 862 $ 461 $ 5,757 $ 5,940 $ 826 ACQUIRED With an allowance recorded: Commercial Loans: Commercial Real Estate - - - 1,205 1,321 691 Total Commercial Loans $ - $ - $ - $ 1,205 $ 1,321 $ 691 Total: $ 23,964 $ 26,056 $ 461 $ 28,874 $ 31,582 $ 1,517 The following tables summarize the average recorded investments on impaired loans specifically evaluated for impairment and the interest income recognized: For the three months ended June 30, 2017 June 30, 2016 (In thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans: Commercial $ 3,931 $ - $ 3,126 $ - Commercial Real Estate 3,243 1 15,278 - Agricultural 157 1 18 - Agricultural Real Estate 1,549 10 610 11 Business Banking 890 3 969 6 Consumer Loans: Indirect 25 1 9 - Home Equity 8,205 110 8,223 120 Direct 120 - - - Residential Real Estate Mortgage 6,388 68 6,203 67 Total Originated $ 24,508 $ 194 $ 34,436 $ 204 ACQUIRED Commercial Loans: Commercial Real Estate - - 1,205 - Total Acquired $ - $ - $ 1,205 $ - Total Loans $ 24,508 $ 194 $ 35,641 $ 204 For the six months ended June 30, 2017 June 30, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans: Commercial $ 3,419 $ - $ 2,972 $ - Commercial Real Estate 4,584 45 14,264 74 Agricultural 165 1 98 1 Agricultural Real Estate 1,564 21 613 22 Business Banking 788 5 973 12 Consumer Loans: Indirect 16 1 10 - Home Equity 8,310 220 8,093 241 Direct 120 - - - Residential Real Estate Mortgage 6,308 129 6,154 134 Total Originated $ 25,274 $ 422 $ 33,177 $ 484 ACQUIRED Commercial Loans: Commercial Real Estate 172 - 1,205 - Total Acquired $ 172 $ - $ 1,205 $ - Total Loans $ 25,446 $ 422 $ 34,382 $ 484 Credit Quality Indicators The Company has developed an internal loan grading system to evaluate and quantify the Company’s loan portfolio with respect to quality and risk. The system focuses on, among other things, financial strength of borrowers, experience and depth of borrower’s management, primary and secondary sources of repayment, payment history, nature of the business and outlook on particular industries. The internal grading system enables the Company to monitor the quality of the entire loan portfolio on a consistent basis and provide management with an early warning system, enabling recognition and response to problem loans and potential problem loans. Commercial Grading System For commercial and agricultural loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This would include comparison of financial strength to available industry averages, comparison of transaction factors (loan terms and conditions) to loan policy and comparison of credit history to stated repayment terms and industry averages. Some grading factors are necessarily more subjective such as economic and industry factors, regulatory environment and management. Classified loans are graded Doubtful, Substandard, Special Mention and Pass. ● Doubtful A Doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the asset, its classification as a loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral and refinancing. Generally, pending events should be resolved within a relatively short period and the ratings will be adjusted based on the new information. Nonaccrual treatment is required for Doubtful assets because of the high probability of loss. ● Substandard Substandard loans have a high probability of payment default or they have other well-defined weaknesses. They require more intensive supervision by bank management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some Substandard loans, the likelihood of full collection of interest and principal may be in doubt and those loans should be placed on nonaccrual. Although Substandard assets in the aggregate will have a distinct potential for loss, an individual asset’s loss potential does not have to be distinct for the asset to be rated Substandard. ● Special Mention Special Mention loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s position at some future date. These loans pose elevated risk, but their weakness does not yet justify a Substandard classification. Borrowers may be experiencing adverse operating trends (e.g., declining revenues or margins) or may be struggling with an ill-proportioned balance sheet (e.g., increasing inventory without an increase in sales, high leverage, tight liquidity). Adverse economic or market conditions, such as interest rate increases or the entry of a new competitor, may also support a Special Mention rating. Although a Special Mention loan has a higher probability of default than a Pass asset, its default is not imminent. ● Pass Loans graded as Pass encompass all loans not graded as Doubtful, Substandard or Special Mention. Pass loans are in compliance with loan covenants and payments are generally made as agreed. Pass loans range from superior quality to fair quality. Business Banking Grading System Business banking loans are graded as either Classified or Non-classified: ● Classified Classified loans are inadequately protected by the current worth and paying capacity of the obligor or, if applicable, the collateral pledged. These loans have a well-defined weakness or weaknesses, that jeopardize the liquidation of the debt or in some cases make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Classified loans have a high probability of payment default or a high probability of total or substantial loss. These loans require more intensive supervision by management and are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. When the likelihood of full collection of interest and principal may be in doubt, Classified loans are considered to have a nonaccrual status. In some cases, Classified loans are considered uncollectible and of such little value that their continuance as assets is not warranted. ● Non-classified Loans graded as Non-classified encompass all loans not graded as Classified. Non-classified loans are in compliance with loan covenants and payments are generally made as agreed. Consumer and Residential Mortgage Grading System Consumer and Residential Mortgage loans are graded as either Performing or Nonperforming. ● Nonperforming Nonperforming loans are loans that are 1) over 90 days past due and interest is still accruing or 2) on nonaccrual status. ● Performing All loans not meeting any of these criteria are considered Performing. The following tables illustrate the Company’s credit quality by loan class: As of June 30, 2017 (In thousands) ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 708,569 $ 1,318,522 $ 32,258 $ 24,525 $ 2,083,874 Special Mention 24,829 31,829 2,520 2,501 61,679 Substandard 28,372 25,196 2,872 4,999 61,439 Doubtful - - 5 - 5 Total $ 761,770 $ 1,375,547 $ 37,655 $ 32,025 $ 2,206,997 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 463,897 $ 463,897 Classified 12,901 12,901 Total $ 476,798 $ 476,798 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,610,892 $ 451,683 $ 63,239 $ 2,125,814 Nonperforming 4,154 3,165 118 7,437 Total $ 1,615,046 $ 454,848 $ 63,357 $ 2,133,251 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 1,082,450 $ 1,082,450 Nonperforming 7,143 7,143 Total $ 1,089,593 $ 1,089,593 As of June 30, 2017 (In thousands) ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 44,517 $ 116,214 $ 160,731 Special Mention 5,719 2,175 7,894 Substandard 943 7,014 7,957 Total $ 51,179 $ 125,403 $ 176,582 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 42,499 $ 42,499 Classified 3,438 3,438 Total $ 45,937 $ 45,937 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 3,603 $ 45,823 $ 2,881 $ 52,307 Nonperforming 37 183 12 232 Total $ 3,640 $ 46,006 $ 2,893 $ 52,539 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 184,198 $ 184,198 Nonperforming 2,016 2,016 Total $ 186,214 $ 186,214 As of December 31, 2016 (In thousands) ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 616,829 $ 1,288,409 $ 36,762 $ 28,912 $ 1,970,912 Special Mention 7,750 31,053 25 1,896 40,724 Substandard 28,991 32,327 1,124 1,614 64,056 Doubtful - - 5 - 5 Total $ 653,570 $ 1,351,789 $ 37,916 $ 32,422 $ 2,075,697 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 458,864 $ 458,864 Classified 13,823 13,823 Total $ 472,687 $ 472,687 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,562,031 $ 453,278 $ 62,977 $ 2,078,286 Nonperforming 4,644 3,379 127 8,150 Total $ 1,566,675 $ 456,657 $ 63,104 $ 2,086,436 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 1,055,055 $ 1,055,055 Nonperforming 8,088 8,088 Total $ 1,063,143 $ 1,063,143 As of December 31, 2016 (In thousands) ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 48,194 $ 127,660 $ 175,854 Special Mention 76 1,231 1,307 Substandard 1,177 7,193 8,370 Doubtful - 1,205 1,205 Total $ 49,447 $ 137,289 $ 186,736 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 47,347 $ 47,347 Classified 3,535 3,535 Total $ 50,882 $ 50,882 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 8,646 $ 50,860 $ 3,165 $ 62,671 Nonperforming 47 267 20 334 Total $ 8,693 $ 51,127 $ 3,185 $ 63,005 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 196,508 $ 196,508 Nonperforming 2,963 2,963 Total $ 199,471 $ 199,471 Troubled Debt Restructured Loans Substantially all of these modifications included one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; temporary reduction in the interest rate; or change in scheduled payment amount. When the Company modifies a loan, management evaluates any possible impairment based on the present value of the expected future cash flows, discounted at the contractual interest rate of the original loan agreement, except when the sole (remaining) source of repayment for the loan is the operation or liquidation of the collateral. In these cases, management uses the current fair value of the collateral, less selling costs, instead of discounted cash flows. If management 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. The following tables illustrate the recorded investment and number of modifications for modified loans, including the recorded investment in the loans prior to a modification and the recorded investment in the loans after restructuring: Three months ended June 30, 2017 (Dollars in thousands) Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Commercial 1 $ 3,300 $ 3,239 Business Banking 1 337 333 Total Commercial 2 3,637 3,572 Consumer Indirect 3 32 31 Home Equity 1 78 78 Direct 1 120 120 Total Consumer 5 230 229 Residential Real Estate 4 346 346 Total Troubled Debt Restructurings 11 $ 4,213 $ 4,147 Three months ended June 30, 2016 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 2 $ 74 $ 73 Total Consumer 2 74 73 Residential Real Estate 2 152 151 Total Troubled Debt Restructurings 4 $ 226 $ 224 Six months ended June 30, 2017 (Dollars in thousands) Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Commercial 1 $ 3,300 $ 3,239 Business Banking 1 337 333 Total Commercial 2 3,637 3,572 Consumer Indirect 3 32 31 Home Equity 4 185 192 Direct 1 120 120 Total Consumer 8 337 343 Residential Real Estate 6 548 554 Total Troubled Debt Restructurings 16 $ 4,522 $ 4,469 Six months ended June 30, 2016 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 14 $ 1,109 $ 1,017 Total Consumer 14 1,109 1,017 Residential Real Estate 6 683 578 Total Troubled Debt Restructurings 20 $ 1,792 $ 1,595 TDRs occurring during the three and six months ended June 30, 2017 and 2016 were due to the reduction in the interest rate or extension of the term. The following table illustrates the recorded investment and number of modifications for TDRs where a concession has been made and subsequently defaulted during the period: Three months ended June 30, 2017 Three months ended June 30, 2016 (Dollars in thousands) Number of contracts Recorded Investment Number of contracts Recorded Investment Commercial Business Banking 1 $ 329 1 $ 67 Total Commercial 1 329 1 67 Consumer Indirect 1 14 - - Home Equity 13 589 10 520 Total Consumer 14 603 10 520 Residential Real Estate 4 251 6 664 Total Troubled Debt Restructurings 19 $ 1,183 17 $ 1,251 Six months ended June 30, 2017 Six months ended June 30, 2016 Number of contracts Recorded Investment Number of contracts Recorded Investment Commercial Commercial 1 $ 145 - $ - Business Banking 1 329 1 67 Total Commercial 2 474 1 67 Consumer Indirect 2 19 - - Home Equity 22 1,101 14 898 Total Consumer 24 1,120 14 898 Residential Real Estate 8 419 10 873 Total Troubled Debt Restructurings 34 $ 2,013 25 $ 1,838

Defined Benefit Post-retirement

Defined Benefit Post-retirement Plans	6 Months Ended
	Jun. 30, 2017
Defined Benefit Post-retirement Plans [Abstract]
Defined Benefit Post-retirement Plans	5. Defined Benefit Post-retirement Plans The Company has a qualified, noncontributory, defined benefit pension plan (“the Plan”) covering substantially all of its employees at June 30, 2017. Benefits paid from the plan are based on age, years of service, compensation, social security benefits and are determined in accordance with defined formulas. The Company’s policy is to fund the pension plan in accordance with Employee Retirement Income Security Act of 1974 standards. Assets of the Plan are invested in publicly traded stocks and mutual funds. The Company is not required to make contributions to the Plan in 2017 and did not do so during the three and six months ended June 30, 2017. The Company was not required to nor made contributions during the three and six months ended June 30, 2016. In addition, the Company provides certain health care benefits for retired employees. Benefits are accrued over the employees’ active service period. Only employees that were employed by the Company on or before January 1, 2000 are eligible to receive post-retirement health care benefits. In addition, the Company assumed post-retirement medical life insurance benefits for certain Alliance employees, retirees and their spouses, if applicable, in the Alliance acquisition. These post-retirement benefits are referred to herein as “Other Benefits.” The components of expense for Pension Benefits and Other Benefits are set forth below: Pension Benefits Other Benefits (In thousands) Three months ended June 30, Three months ended June 30, Components of net periodic (benefit) cost: 2017 2016 2017 2016 Service cost $ 402 $ 560 $ 3 $ 4 Interest cost 1,042 1,051 86 94 Expected return on plan assets (1,985 ) (1,835 ) - - Net amortization 415 483 20 29 Total (benefit) cost $ (126 ) $ 259 $ 109 $ 127 Pension Benefits Other Benefits Six months ended June 30, Six months ended June 30, Components of net periodic (benefit) cost: 2017 2016 2017 2016 Service cost $ 804 $ 1,120 $ 6 $ 8 Interest cost 2,084 2,102 172 188 Expected return on plan assets (3,970 ) (3,670 ) - - Net amortization 831 966 40 58 Total (benefit) cost $ (251 ) $ 518 $ 218 $ 254

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	6. Earnings Per Share Basic earnings per share ("EPS") excludes dilution and is computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as the Company’s dilutive stock options and restricted stock units). The following is a reconciliation of basic and diluted EPS for the periods presented in the unaudited interim consolidated statements of income: Three months ended June 30, 2017 2016 (In thousands, except per share data) Basic EPS: Weighted average common shares outstanding 43,579 43,099 Net income available to common stockholders $ 21,359 $ 19,909 Basic EPS $ 0.49 $ 0.46 Diluted EPS: Weighted average common shares outstanding 43,579 43,009 Dilutive effect of common stock options and restricted stock 322 354 Weighted average common shares and common share equivalents 43,901 43,363 Net income available to common stockholders $ 21,359 $ 19,909 Diluted EPS $ 0.49 $ 0.46 Six months ended June 30, 2017 2016 Basic EPS: Weighted average common shares outstanding 43,546 43,220 Net income available to common stockholders $ 41,638 $ 38,800 Basic EPS $ 0.96 $ 0.90 Diluted EPS: Weighted average common shares outstanding 43,546 43,220 Dilutive effect of common stock options and restricted stock 340 364 Weighted average common shares and common share equivalents 43,886 43,584 Net income available to common stockholders $ 41,638 $ 38,800 Diluted EPS $ 0.95 $ 0.89 There were 3,250 and 33,179 stock options for the three months ended June 30, 2017 and June 30, 2016, respectively, that were not considered in the calculation of diluted EPS since the stock options’ exercise price was greater than the average market price during these periods. There were 1,144 and 25,139 stock options for the six months ended June 30, 2017 and June 30, 2016, respectively, that were not considered in the calculation of diluted EPS since the stock options’ exercise price was greater than the average market price during these periods.

Reclassification Adjustments Ou

Reclassification Adjustments Out of Other Comprehensive Income	6 Months Ended
	Jun. 30, 2017
Reclassification Adjustments Out of Other Comprehensive Income [Abstract]
Reclassification Adjustments Out of Other Comprehensive Income	7. Reclassification Adjustments Out of Other Comprehensive Income The following table summarizes the reclassification adjustments out of accumulated other comprehensive income: Detail About Accumulated Other Comprehensive Income Components Amount Reclassified From Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Comprehensive Income (In thousands) Three months ended June 30, 2017 June 30, 2016 AFS Securities: Gains on AFS securities $ (2 ) $ (1 ) Net securities gains Amortization of unrealized gains related to securities transfer 225 280 Interest income Income tax (expense) (85 ) (108 ) Income tax (expense) Net of tax $ 138 $ 171 Pension and other benefits: Amortization of net losses $ 435 $ 515 Salaries and employee benefits Amortization of prior service costs - (3 ) Salaries and employee benefits Income tax (expense) (166 ) (199 ) Income tax (expense) Net of tax $ 269 $ 313 Total reclassifications during the period, net of tax $ 407 $ 484 Detail About Accumulated Other Comprehensive Income Components Amount Reclassified From Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Comprehensive Income Six months ended June 30, 2017 June 30, 2016 AFS Securities: Gains on AFS securities $ (2 ) $ (30 ) Net securities gains Amortization of unrealized gains related to securities transfer 463 576 Interest income Impairment write-down of equity security 1,312 - Other noninterest income Income tax (expense) (176 ) (213 ) Income tax (expense) Net of tax $ 1,597 $ 333 Pension and other benefits: Amortization of net losses $ 870 $ 1,030 Salaries and employee benefits Amortization of prior service costs - (6 ) Salaries and employee benefits Income tax (expense) (332 ) (398 ) Income tax (expense) Net of tax $ 538 $ 626 Total reclassifications during the period, net of tax $ 2,135 $ 959

Fair Value Measurements and Fai

Fair Value Measurements and Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value Measurements and Fair Value of Financial Instruments	8. Fair Value Measurements and Fair Value of Financial Instruments GAAP states that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). 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 types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments. The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations and certain physical commodities. Such instruments are generally classified within Level 2 of the fair value hierarchy. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). Other investment securities are reported at fair value utilizing Level 1 and Level 2 inputs. The prices for Level 2 instruments are obtained through an independent pricing service or dealer market participants with whom the Company has historically transacted both purchases and sales of investment securities. Prices obtained from these sources include prices derived from market quotations and matrix pricing. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions, amount other things. Management reviews the methodologies used in pricing the securities by its third party providers. Level 3 is for positions that are not traded in active markets or are subject to transfer restrictions, valuations are adjusted to reflect illiquidity and/or non-transferability and such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Subsequent to inception, management only changes Level 3 inputs and assumptions when corroborated by evidence such as transactions in similar instruments, completed or pending third-party transactions in the underlying investment or comparable entities, subsequent rounds of financing, recapitalizations and other transactions across the capital structure, offerings in the equity or debt markets and changes in financial ratios or cash flows. For the three and six month periods ended June 30, 2017 and June 30, 2016, the Company has made no transfers of assets between Level 1 and Level 2 and has had no Level 3 activity. The following tables set forth the Company’s financial assets and liabilities measured on a recurring basis that were accounted for at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: (In thousands) Level 1 Level 2 Level 3 Balance as of June 30, 2017 Assets: AFS securities: Federal agency $ - $ 159,520 $ - $ 159,520 State & municipal - 44,020 - 44,020 Mortgage-backed - 564,061 - 564,061 Collateralized mortgage obligations - 578,908 - 578,908 Other securities 10,744 8,268 - 19,012 Total AFS securities $ 10,744 $ 1,354,777 $ - $ 1,365,521 Trading securities 10,406 - - 10,406 Derivatives - 5,631 - 5,631 Total $ 21,150 $ 1,360,408 $ - $ 1,381,558 Liabilities: Derivatives $ - $ 2,960 $ - $ 2,960 Total $ - $ 2,960 $ - $ 2,960 (In thousands) Level 1 Level 2 Level 3 Balance as of December 31, 2016 Assets: AFS securities: Federal agency $ - $ 174,408 $ - $ 174,408 State & municipal - 46,726 - 46,726 Mortgage-backed - 529,844 - 529,844 Collateralized mortgage obligations - 566,573 - 566,573 Other securities 11,493 9,246 - 20,739 Total AFS securities $ 11,493 $ 1,326,797 $ - $ 1,338,290 Trading securities 9,259 - - 9,259 Derivatives - 3,210 - 3,210 Total $ 20,752 $ 1,330,007 $ - $ 1,350,759 Liabilities: Derivatives $ - $ 506 $ - $ 506 Total $ - $ 506 $ - $ 506 GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a non-recurring basis such as loans held for sale, other real estate owned, collateral-dependent impaired loans, mortgage servicing rights and held to maturity securities. The only non-recurring fair value measurements recorded during the three and six month periods ended June 30, 2017 and June 30, 2016 were related to impaired loans. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the specific reserves for collateral dependent impaired loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%. Based on the valuation techniques used, the fair value measurements for collateral dependent impaired loans are classified as Level 3. As of June 30, 2017 and December 31, 2016, the Company had $0.8 million and $7.0 million, respectively, of loans recorded at fair value with specific allowance reserves of $0.5 million and $1.5 million, respectively. The following table sets forth information with regard to estimated fair values of financial instruments. This table excludes financial instruments for which the carrying amount approximates fair value. Financial instruments for which the fair value approximates carrying value include cash and cash equivalents, securities AFS, trading securities, accrued interest receivable, non-maturity deposits, short-term borrowings, accrued interest payable and interest rate swaps. June 30, 2017 December 31, 2016 (In thousands) Fair Value Hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value Financial assets HTM securities 2 $ 515,628 $ 516,656 $ 527,948 $ 525,050 Net loans 3 6,301,311 6,453,713 6,132,857 6,273,233 Financial liabilities Time deposits 2 $ 832,449 $ 828,947 $ 872,411 $ 868,153 Long-term debt 2 88,958 89,064 104,087 104,113 Junior subordinated debt 2 101,196 103,499 101,196 102,262 Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. 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. Because no market exists for a significant portion of the Company’s 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 factors. These estimates are subjective in nature, and involve uncertainties and matters of significant judgment, and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on and off balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, the Company has a substantial trust and investment management operation that contributes net fee income annually. The trust and investment management operation is not considered a financial instrument and its value has not been incorporated into the fair value estimates. Other significant assets and liabilities include the benefits resulting from the low-cost funding of deposit liabilities as compared to the cost of borrowing funds in the market and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimate of fair value. Securities Held to Maturity The fair value of the Company’s investment securities held to maturity is primarily measured using information from a third party pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Net Loans The fair value of the Company’s loans was estimated by discounting the expected future cash flows using the current interest rates at which similar loans would be made for the same remaining maturities. Loans were first segregated by type and then further segmented into fixed and variable rate and loan quality categories. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments. Time Deposits The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value. Long-Term Debt The fair value of long-term debt was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. Junior Subordinated Debt The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis. Interest Rate Swaps The Company enters into interest rate swaps to facilitate customer transactions and meet their financing needs. These swaps are considered derivatives, but are not designated in hedging relationships. These instruments have interest rate and credit risk associated with them. To mitigate the interest rate risk, the Company enters into offsetting interest rate swaps with counterparties. The counterparty swaps are also considered derivatives and are also not designated in hedging relationships. Interest rate swaps are recorded within other assets or other liabilities on the unaudited interim consolidated balance sheet at their estimated fair value. Changes to the fair value of assets and liabilities arising from these derivatives are included, net, in other operating income in the unaudited interim consolidated statement of income. At June 30, 2017, the notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $410.5 million and the fair values included in other assets and other liabilities on the unaudited interim consolidated balance sheet applicable to these agreements amounted to $2.8 million. At December 31, 2016, the notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $371.1 million and the fair values included in other assets and other liabilities on the unaudited interim consolidated balance sheet applicable to these agreements amounted to $0.3 million. In 2016, the Company entered into interest rate swaps to modify the interest rate characteristics of certain short-term Federal Home Loan Bank advances from variable rate to fixed rate in order to reduce the impact of changes in future cash flows due to market interest rate changes. These agreements are designated as cash flow hedges. The notional amount of these interest rate derivative agreements total $250.0 million at June 30, 2017 and December 31, 2016. Fair values included in other assets on the unaudited interim consolidated balance sheet applicable to these agreements amounted to $2.8 million at June 30, 2017 and $2.9 million at December 31, 2016. Fair values included in other liabilities on the unaudited interim consolidated balance sheet applicable to these agreements amounted to $0.1 million at June 30, 2017 and $0.2 million at December 31, 2016.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies The Company is a party to financial instruments in the normal course of business to meet the financing needs of its customers and to reduce its own exposure to fluctuating interest rates. These financial instruments include commitments to extend credit, unused lines of credit and standby letters of credit. Exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to make loans and standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit origination guidelines, portfolio maintenance and management procedures as other credit and off-balance sheet products. Commitments to extend credit and unused lines of credit totaled $1.6 billion at June 30, 2017 and $1.5 billion at December 31, 2016. Since commitments to extend credit and unused lines of credit may expire without being fully drawn upon, this amount does not necessarily represent future cash commitments. Collateral obtained upon exercise of the commitment is determined using management’s credit evaluation of the borrower and may include accounts receivable, inventory, property, land and other items. The Company guarantees the obligations or performance of customers by issuing standby letters of credit to third parties. These standby letters of credit are frequently issued in support of third party debt, such as corporate debt issuances, industrial revenue bonds and municipal securities. The credit risk involved in issuing standby letters of credit is essentially the same as the credit risk involved in extending loan facilities to customers and they are subject to the same credit origination guidelines, portfolio maintenance and management procedures as other credit and off-balance sheet products. Typically, these instruments have terms of five years or less and expire unused; therefore, the total amounts do not necessarily represent future cash commitments. Standby letters of credit totaled $47.5 million at June 30, 2017 and $36.8 million at December 31, 2016. As of June 30, 2017 and December 31, 2016, the fair value of standby letters of credit was not significant to the Company’s unaudited interim consolidated financial statements.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2017
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	10. Recent Accounting Pronouncements Recently Adopted Accounting Standards Effective January 1, 2017, the Company adopted the prevision of Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") No. 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting Transition to the new guidance was accomplished through a combination of cumulative-effect adjustment to equity (forfeitures) and prospective methodologies (cash flows, tax windfalls and shortfalls). The actual effects of adoption in 2017 will primarily depend upon the share price of the common stock, which affects the vesting of certain performance awards, probability of exercise of certain stock options and the magnitude of windfalls for all awards upon either vesting or exercise. The effect on earnings per share calculations and election to account for forfeitures as incurred have not been significant. Accounting Standards Issued Not Yet Adopted In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718). In March 2017, the FASB issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20) In March 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715) In February 2017, the FASB issued ASU No. 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) in substance nonfinancial assets In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 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 In May 2014, the FASB issued ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers - Deferral of the Effective Date Principal versus Agent Considerations (Reporting Revenue Gross versus Net), Identifying Performance Obligations and Licensing, Narrow-Scope Improvements and Practical Expedients Technical Corrections and Improvements to Top 606 - Revenue from Contract with Customers

Description of Business (Polici

Description of Business (Policies)	6 Months Ended
	Jun. 30, 2017
Description of Business [Abstract]
Nature of Operations	NBT Bancorp Inc. (the “Registrant” or the “Company”) is a registered financial holding company incorporated in the state of Delaware in 1986, with its principal headquarters located in Norwich, New York. The principal assets of the Registrant consist of all of the outstanding shares of common stock of its subsidiaries, including: NBT Bank, National Association (the “Bank”), NBT Financial Services, Inc. (“NBT Financial”), NBT Holdings, Inc. (“NBT Holdings”), Hathaway Agency, Inc. and CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I and Alliance Financial Capital Trust II (collectively, the “Trusts”). The Company’s principal sources of revenue are the management fees and dividends it receives from the Bank, NBT Financial and NBT Holdings. The Company’s business, primarily conducted through the Bank but also through its other subsidiaries, consists of providing commercial banking and financial services to customers in its market area, which includes central and upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont and the greater Portland, Maine area. The Company has been and intends to continue to be, a community-oriented financial institution offering a variety of financial services. The Company’s business philosophy is to operate as a community bank with local decision-making, principally in non-metropolitan markets, providing a broad array of banking and financial services to retail, commercial and municipal customers.

Securities (Policies)

Securities (Policies)	6 Months Ended
	Jun. 30, 2017
Securities [Abstract]
Investment, Policy	Declines in the fair value of HTM and AFS securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses or in other comprehensive income. Depending on whether the Company intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment ("OTTI") shall be recognized in earnings equal to the entire difference between the investment's amortized cost basis and its fair value at the balance sheet date. If the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the OTTI shall be separated into (a) the amount representing the credit loss and (b) the amount related to all other factors. The amount of the total OTTI related to the credit loss shall be recognized in earnings. The amount of the total OTTI related to other factors shall be recognized in other comprehensive income, net of applicable taxes. In estimating OTTI losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer and (iii) the historical and implied volatility of the fair value of the security. Management has the intent to hold the securities classified as HTM until they mature, at which time it is believed the Company will receive full value for the securities. The unrealized losses on HTM debt securities are due to increases in market interest rates over yields at the time the underlying securities were purchased. When necessary, the Company has performed a discounted cash flow analysis to determine whether or not it will receive the contractual principal and interest on certain securities. The fair value is expected to recover as the bond approaches their maturity date or repricing date or if market yields for such investments decline. Management also has the intent to hold and will not be required to sell, the securities classified as AFS for a period of time sufficient for a recovery of cost, which may be until maturity. The unrealized losses on AFS debt securities are due to increases in market interest rates over the yields available at the time the underlying securities were purchased. When necessary, the Company has performed a discounted cash flow analysis to determine whether or not it will receive the contractual principal and interest on certain securities. For AFS debt and equity securities, OTTI losses are recognized in earnings if the Company intends to sell the security. In other cases the Company considers the relevant factors noted above, as well as the Company's intent and ability to retain its investment for a period of time sufficient to allow for any anticipated recovery in market value and whether evidence exists to support a realizable value equal to or greater than the cost basis. Any impairment loss on an equity security is equal to the full difference between the cost basis and the fair value of the security. Maturities of mortgage-backed, collateralized mortgage obligations and asset-backed securities are stated based on their estimated average lives. Actual maturities may differ from estimated average lives or contractual maturities because, in certain cases, borrowers have the right to call or prepay obligations with or without call or prepayment penalties.

Allowance for Loan Losses and22

Allowance for Loan Losses and Credit Quality of Loans (Policies)	6 Months Ended
	Jun. 30, 2017
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Portfolio and Class Segments	The following table illustrates the portfolio and class segments for the Company’s loan portfolio: Portfolio Class Commercial Loans Commercial Commercial Real Estate Agricultural Agricultural Real Estate Business Banking Consumer Loans Indirect Home Equity Direct Residential Real Estate Mortgages
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is maintained at a level estimated by management to provide adequately for probable incurred losses inherent in the current loan portfolio. The appropriateness of the allowance for loan losses is continuously monitored. It is assessed for appropriateness using a methodology designed to ensure the level of the allowance reasonably reflects the loan portfolio’s risk profile. It is evaluated to ensure that it is sufficient to absorb all reasonably estimable credit losses inherent in the current loan portfolio. To develop and document a systematic methodology for determining the allowance for loan losses, the Company has divided the loan portfolio into three segments, each with different risk characteristics and methodologies for assessing risk. Those segments are further segregated between our loans accounted for under the amortized cost method (referred to as “originated” loans) and loans acquired in a business combination (referred to as “acquired” loans). Each portfolio segment is broken down into class segments where appropriate. Class segments contain unique measurement attributes, risk characteristics and methods for monitoring and assessing risk that are necessary to develop the allowance for loan losses. Unique characteristics such as borrower type, loan type, collateral type and risk characteristics define each class segment. Commercial Loans The Company offers a variety of commercial loan products including commercial (non-real estate), commercial real estate, agricultural, agricultural real estate and business banking loans. The Company’s underwriting analysis for commercial loans typically includes credit verification, independent appraisals, a review of the borrower’s financial condition and a detailed analysis of the borrower’s underlying cash flows. Commercial – Commercial Real Estate – Agricultural Agricultural Real Estate Business Banking Consumer Loans The Company offers a variety of consumer loan products including indirect, home equity and direct loans. Indirect – Home Equity Direct – Residential Real Estate Mortgages Residential real estate loans consist primarily of loans secured by first or second deeds of trust on primary residences. We originate adjustable-rate and fixed-rate, one-to-four-family residential real estate loans for the construction, purchase or refinancing of a mortgage. These loans are collateralized by owner-occupied properties located in the Company’s market area. When market conditions are favorable, for longer term, fixed-rate residential mortgages without escrow, the Company retains the servicing, but sells the right to receive principal and interest to Freddie Mac. This practice allows the Company to manage interest rate, liquidity risk and credit risk. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower) or have private mortgage insurance. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. Allowance for Loan Loss Calculation For purposes of evaluating the adequacy of the allowance, the Company considers a number of significant factors that affect the collectability of the portfolio. For individually analyzed loans, these include estimates of loss exposure, which reflect the facts and circumstances that affect the likelihood of repayment of such loans as of the evaluation date. For homogeneous pools of loans, estimates of the Company’s exposure to credit loss reflect a current assessment of a number of factors, which could affect collectability. These factors include: past loss experience, size, trend, composition and nature of loans; changes in lending policies and procedures, including underwriting standards and collection, charge-offs and recoveries; trends experienced in nonperforming and delinquent loans; current economic conditions in the Company’s market; portfolio concentrations that may affect loss experienced across one or more components of the portfolio; the effect of external factors such as competition, legal and regulatory requirements; and the experience, ability and depth of lending management and staff. In addition, various regulatory agencies, as an integral component of their examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to make loan grade changes as well as recognize additions to the allowance based on their examinations. After a thorough consideration of the factors discussed above, any required additions or reductions to the allowance for loan losses are made periodically by charges or credits to the provision for loan losses. These charges are necessary to maintain the allowance at a level that management believes is reflective of overall inherent risk of probable loss in the portfolio. While management uses available information to recognize losses on loans, additions and reductions of the allowance may fluctuate from one reporting period to another. These fluctuations are reflective of changes in risk associated with portfolio content and/or changes in management’s assessment of any or all of the determining factors discussed above. For acquired loans, to the extent that we experience deterioration in borrower credit quality resulting in a decrease in our expected cash flows subsequent to the acquisition of the loans, an allowance for loan losses would be established based on our estimate of future credit losses over the remaining life of the loan. Credit Quality of Loans For all loan classes within the Company's loan portfolio, loans are placed on nonaccrual status when timely collection of principal and interest in accordance with contractual terms is doubtful. Loans are transferred to nonaccrual status generally when principal or interest payments become ninety days delinquent, unless the loan is well-secured and in the process of collection or sooner when management concludes or circumstances indicate that borrowers may be unable to meet contractual principal or interest payments. When a loan is transferred to a nonaccrual status, all interest previously accrued in the current period but not collected is reversed against interest income in that period. Any payment received on a nonaccrual loan is applied to principal. For all loan classes within the Company's loan portfolio, nonaccrual loans are returned to accrual status when they become current as to principal and interest and demonstrate a period of performance under the contractual terms and, in the opinion of management, are fully collectible as to principal and interest. For loans in all portfolios, the principal amount is charged off in full or in part as soon as management determines, based on available facts, that the collection of principal in full is improbable. For commercial loans, management considers specific facts and circumstances relative to individual credits in making such a determination. For consumer and residential loan classes, management uses specific guidance and thresholds from the Federal Financial Institutions Examination Council’s Uniform Retail Credit Classification and Account Management Policy. Impaired Loans The methodology used to establish the allowance for loan losses on impaired loans incorporates specific allocations on loans analyzed individually. Classified loans, including all trouble debt restructured loans ("TDRs") and nonaccrual commercial loans that are graded Substandard or below, with outstanding balances equal to or greater than $0.8 million are evaluated for impairment through the Company’s quarterly status review process. In determining whether we are able to collect all principal and interest payments due in accordance with the contractual terms of the loan agreements, we consider factors such as payment history and changes in the financial condition of individual borrowers, local economic conditions, historical loss experience and the conditions of the various markets in which the collateral may be liquidated. For loans that are evaluated for impairment, impairment is measured by one of three methods: 1) the fair value of collateral less cost to sell, 2) present value of expected future cash flows or 3) the loan’s observable market price. These impaired loans are reviewed on a quarterly basis for changes in the level of impairment. Any change to the previously recognized impairment loss is recognized as a change to the allowance account and recorded in the unaudited interim consolidated statements of income as a component of the provision for loan losses. Credit Quality Indicators The Company has developed an internal loan grading system to evaluate and quantify the Company’s loan portfolio with respect to quality and risk. The system focuses on, among other things, financial strength of borrowers, experience and depth of borrower’s management, primary and secondary sources of repayment, payment history, nature of the business and outlook on particular industries. The internal grading system enables the Company to monitor the quality of the entire loan portfolio on a consistent basis and provide management with an early warning system, enabling recognition and response to problem loans and potential problem loans. Commercial Grading System For commercial and agricultural loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This would include comparison of financial strength to available industry averages, comparison of transaction factors (loan terms and conditions) to loan policy and comparison of credit history to stated repayment terms and industry averages. Some grading factors are necessarily more subjective such as economic and industry factors, regulatory environment and management. Classified loans are graded Doubtful, Substandard, Special Mention and Pass. ● Doubtful A Doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the asset, its classification as a loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral and refinancing. Generally, pending events should be resolved within a relatively short period and the ratings will be adjusted based on the new information. Nonaccrual treatment is required for Doubtful assets because of the high probability of loss. ● Substandard Substandard loans have a high probability of payment default or they have other well-defined weaknesses. They require more intensive supervision by bank management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some Substandard loans, the likelihood of full collection of interest and principal may be in doubt and those loans should be placed on nonaccrual. Although Substandard assets in the aggregate will have a distinct potential for loss, an individual asset’s loss potential does not have to be distinct for the asset to be rated Substandard. ● Special Mention Special Mention loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s position at some future date. These loans pose elevated risk, but their weakness does not yet justify a Substandard classification. Borrowers may be experiencing adverse operating trends (e.g., declining revenues or margins) or may be struggling with an ill-proportioned balance sheet (e.g., increasing inventory without an increase in sales, high leverage, tight liquidity). Adverse economic or market conditions, such as interest rate increases or the entry of a new competitor, may also support a Special Mention rating. Although a Special Mention loan has a higher probability of default than a Pass asset, its default is not imminent. ● Pass Loans graded as Pass encompass all loans not graded as Doubtful, Substandard or Special Mention. Pass loans are in compliance with loan covenants and payments are generally made as agreed. Pass loans range from superior quality to fair quality. Business Banking Grading System Business banking loans are graded as either Classified or Non-classified: ● Classified Classified loans are inadequately protected by the current worth and paying capacity of the obligor or, if applicable, the collateral pledged. These loans have a well-defined weakness or weaknesses, that jeopardize the liquidation of the debt or in some cases make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Classified loans have a high probability of payment default or a high probability of total or substantial loss. These loans require more intensive supervision by management and are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. When the likelihood of full collection of interest and principal may be in doubt, Classified loans are considered to have a nonaccrual status. In some cases, Classified loans are considered uncollectible and of such little value that their continuance as assets is not warranted. ● Non-classified Loans graded as Non-classified encompass all loans not graded as Classified. Non-classified loans are in compliance with loan covenants and payments are generally made as agreed. Consumer and Residential Mortgage Grading System Consumer and Residential Mortgage loans are graded as either Performing or Nonperforming. ● Nonperforming Nonperforming loans are loans that are 1) over 90 days past due and interest is still accruing or 2) on nonaccrual status. ● Performing All loans not meeting any of these criteria are considered Performing.
Troubled Debt Restructuring	Troubled Debt Restructured Loans Substantially all of these modifications included one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; temporary reduction in the interest rate; or change in scheduled payment amount. When the Company modifies a loan, management evaluates any possible impairment based on the present value of the expected future cash flows, discounted at the contractual interest rate of the original loan agreement, except when the sole (remaining) source of repayment for the loan is the operation or liquidation of the collateral. In these cases, management uses the current fair value of the collateral, less selling costs, instead of discounted cash flows. If management 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.

Defined Benefit Post-retireme23

Defined Benefit Post-retirement Plans (Policies)	6 Months Ended
	Jun. 30, 2017
Defined Benefit Post-retirement Plans [Abstract]
Postemployment Benefit Plans, Policy	The Company has a qualified, noncontributory, defined benefit pension plan (“the Plan”) covering substantially all of its employees at June 30, 2017. Benefits paid from the plan are based on age, years of service, compensation, social security benefits and are determined in accordance with defined formulas. The Company’s policy is to fund the pension plan in accordance with Employee Retirement Income Security Act of 1974 standards. Assets of the Plan are invested in publicly traded stocks and mutual funds. The Company is not required to make contributions to the Plan in 2017 and did not do so during the three and six months ended June 30, 2017. The Company was not required to nor made contributions during the three and six months ended June 30, 2016. In addition, the Company provides certain health care benefits for retired employees. Benefits are accrued over the employees’ active service period. Only employees that were employed by the Company on or before January 1, 2000 are eligible to receive post-retirement health care benefits. In addition, the Company assumed post-retirement medical life insurance benefits for certain Alliance employees, retirees and their spouses, if applicable, in the Alliance acquisition. These post-retirement benefits are referred to herein as “Other Benefits.”

Earnings Per Share (Policies)

Earnings Per Share (Policies)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Basic earnings per share ("EPS") excludes dilution and is computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as the Company’s dilutive stock options and restricted stock units).

Fair Value Measurements and F25

Fair Value Measurements and Fair Value of Financial Instruments (Policies)	6 Months Ended
	Jun. 30, 2017
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Instruments, Policy	GAAP states that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). 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 types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments. The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations or alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations and certain physical commodities. Such instruments are generally classified within Level 2 of the fair value hierarchy. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). Other investment securities are reported at fair value utilizing Level 1 and Level 2 inputs. The prices for Level 2 instruments are obtained through an independent pricing service or dealer market participants with whom the Company has historically transacted both purchases and sales of investment securities. Prices obtained from these sources include prices derived from market quotations and matrix pricing. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions, amount other things. Management reviews the methodologies used in pricing the securities by its third party providers. Level 3 is for positions that are not traded in active markets or are subject to transfer restrictions, valuations are adjusted to reflect illiquidity and/or non-transferability and such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Subsequent to inception, management only changes Level 3 inputs and assumptions when corroborated by evidence such as transactions in similar instruments, completed or pending third-party transactions in the underlying investment or comparable entities, subsequent rounds of financing, recapitalizations and other transactions across the capital structure, offerings in the equity or debt markets and changes in financial ratios or cash flows. GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a non-recurring basis such as loans held for sale, other real estate owned, collateral-dependent impaired loans, mortgage servicing rights and held to maturity securities. The only non-recurring fair value measurements recorded during the three and six month periods ended June 30, 2017 and June 30, 2016 were related to impaired loans. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the specific reserves for collateral dependent impaired loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%. Based on the valuation techniques used, the fair value measurements for collateral dependent impaired loans are classified as Level 3. Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. 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. Because no market exists for a significant portion of the Company’s 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 factors. These estimates are subjective in nature, and involve uncertainties and matters of significant judgment, and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on and off balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, the Company has a substantial trust and investment management operation that contributes net fee income annually. The trust and investment management operation is not considered a financial instrument and its value has not been incorporated into the fair value estimates. Other significant assets and liabilities include the benefits resulting from the low-cost funding of deposit liabilities as compared to the cost of borrowing funds in the market and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimate of fair value. Securities Held to Maturity The fair value of the Company’s investment securities held to maturity is primarily measured using information from a third party pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Net Loans The fair value of the Company’s loans was estimated by discounting the expected future cash flows using the current interest rates at which similar loans would be made for the same remaining maturities. Loans were first segregated by type and then further segmented into fixed and variable rate and loan quality categories. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments. Time Deposits The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value. Long-Term Debt The fair value of long-term debt was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. Junior Subordinated Debt The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis. Interest Rate Swaps The Company enters into interest rate swaps to facilitate customer transactions and meet their financing needs. These swaps are considered derivatives, but are not designated in hedging relationships. These instruments have interest rate and credit risk associated with them. To mitigate the interest rate risk, the Company enters into offsetting interest rate swaps with counterparties. The counterparty swaps are also considered derivatives and are also not designated in hedging relationships. Interest rate swaps are recorded within other assets or other liabilities on the unaudited interim consolidated balance sheet at their estimated fair value. Changes to the fair value of assets and liabilities arising from these derivatives are included, net, in other operating income in the unaudited interim consolidated statement of income.

Recent Accounting Pronounceme26

Recent Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2017
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Recently Adopted Accounting Standards Effective January 1, 2017, the Company adopted the prevision of Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") No. 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting Transition to the new guidance was accomplished through a combination of cumulative-effect adjustment to equity (forfeitures) and prospective methodologies (cash flows, tax windfalls and shortfalls). The actual effects of adoption in 2017 will primarily depend upon the share price of the common stock, which affects the vesting of certain performance awards, probability of exercise of certain stock options and the magnitude of windfalls for all awards upon either vesting or exercise. The effect on earnings per share calculations and election to account for forfeitures as incurred have not been significant.
Accounting Standards Issued Not Yet Adopted	Accounting Standards Issued Not Yet Adopted In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718). In March 2017, the FASB issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20) In March 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715) In February 2017, the FASB issued ASU No. 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) in substance nonfinancial assets In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) 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 In May 2014, the FASB issued ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers - Deferral of the Effective Date Principal versus Agent Considerations (Reporting Revenue Gross versus Net), Identifying Performance Obligations and Licensing, Narrow-Scope Improvements and Practical Expedients Technical Corrections and Improvements to Top 606 - Revenue from Contract with Customers

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Securities [Abstract]
Amortized Cost, Estimated Fair Value, and Unrealized Gains and Losses of Securities Available for Sale	The amortized cost, estimated fair value and unrealized gains and losses of available for sale ("AFS") securities are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value June 30, 2017 Federal agency $ 159,999 $ 46 $ 525 $ 159,520 State & municipal 44,023 136 139 44,020 Mortgage-backed: Government-sponsored enterprises 544,616 3,503 1,414 546,705 U.S. government agency securities 17,167 406 217 17,356 Collateralized mortgage obligations: Government-sponsored enterprises 528,561 622 5,551 523,632 U.S. government agency securities 55,713 191 628 55,276 Other securities 13,537 5,614 139 19,012 Total securities AFS $ 1,363,616 $ 10,518 $ 8,613 $ 1,365,521 December 31, 2016 Federal agency $ 175,135 $ 78 $ 805 $ 174,408 State & municipal 47,053 153 480 46,726 Mortgage-backed: Government-sponsored enterprises 513,814 3,345 2,492 514,667 U.S. government agency securities 14,955 411 189 15,177 Collateralized mortgage obligations: Government-sponsored enterprises 513,431 532 7,688 506,275 U.S. government agency securities 60,822 184 708 60,298 Other securities 15,849 6,394 1,504 20,739 Total securities AFS $ 1,341,059 $ 11,097 $ 13,866 $ 1,338,290
Amortized Cost, Estimated Fair Value, and Unrealized Gains and Losses of Securities Held to Maturity	The amortized cost, estimated fair value and unrealized gains and losses of held to maturity ("HTM") securities are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value June 30, 2017 Mortgage-backed: Government-sponsored enterprises $ 102,651 $ 61 $ 878 $ 101,834 U.S. government agency securities 474 69 - 543 Collateralized mortgage obligations: Government-sponsored enterprises 205,806 1,280 1,068 206,018 State & municipal 206,697 2,097 533 208,261 Total securities HTM $ 515,628 $ 3,507 $ 2,479 $ 516,656 December 31, 2016 Mortgage-backed: Government-sponsored enterprises $ 96,668 $ - $ 1,176 $ 95,492 U.S. government agency securities 533 87 - 620 Collateralized mortgage obligations: Government-sponsored enterprises 225,213 1,060 1,508 224,765 State & municipal 205,534 434 1,795 204,173 Total securities HTM $ 527,948 $ 1,581 $ 4,479 $ 525,050
Investment Securities with Unrealized Losses	The following table sets forth information with regard to investment securities with unrealized losses segregated according to the length of time the securities had been in a continuous unrealized loss position: (Dollars in thousands) Less than 12 months 12 months or longer Total Security Type: Fair Value Unrealized losses Number of Positions Fair Value Unrealized losses Number of Positions Fair Value Unrealized losses Number of Positions June 30, 2017 AFS securities: Federal agency $ 109,778 $ (525 ) 9 $ - $ - - $ 109,778 $ (525 ) 9 State & municipal 23,771 (120 ) 36 1,052 (19 ) 1 24,823 (139 ) 37 Mortgage-backed 210,648 (1,618 ) 46 963 (13 ) 4 211,611 (1,631 ) 50 Collateralized mortgage obligations 452,830 (6,091 ) 61 6,347 (88 ) 2 459,177 (6,179 ) 63 Other securities 1,990 (10 ) 1 2,976 (129 ) 1 4,966 (139 ) 2 Total securities with unrealized losses $ 799,017 $ (8,364 ) 153 $ 11,338 $ (249 ) 8 $ 810,355 $ (8,613 ) 161 HTM securities: Mortgage-backed $ 52,892 $ (878 ) 4 $ - $ - - $ 52,892 $ (878 ) 4 Collateralized mortgage obligations 40,458 (148 ) 6 32,969 (920 ) 4 73,427 (1,068 ) 10 State & municipal 24,400 (397 ) 36 2,688 (136 ) 5 27,088 (533 ) 41 Total securities with unrealized losses $ 117,750 $ (1,423 ) 46 $ 35,657 $ (1,056 ) 9 $ 153,407 $ (2,479 ) 55 December 31, 2016 AFS securities: Federal agency $ 119,363 $ (805 ) 10 $ - $ - - $ 119,363 $ (805 ) 10 State & municipal 31,873 (478 ) 55 483 (2 ) 1 32,356 (480 ) 56 Mortgage-backed 277,524 (2,668 ) 49 985 (13 ) 4 278,509 (2,681 ) 53 Collateralized mortgage obligations 473,746 (8,396 ) 57 - - - 473,746 (8,396 ) 57 Other securities - - - 4,363 (1,504 ) 2 4,363 (1,504 ) 2 Total securities with unrealized losses $ 902,506 $ (12,347 ) 171 $ 5,831 $ (1,519 ) 7 $ 908,337 $ (13,866 ) 178 HTM securities: Mortgage-backed $ 95,492 $ (1,176 ) 5 $ - $ - - $ 95,492 $ (1,176 ) 5 Collateralized mortgage obligations 108,587 (319 ) 12 35,209 (1,189 ) 4 143,796 (1,508 ) 16 State & municipal 81,984 (1,795 ) 155 - - - 81,984 (1,795 ) 155 Total securities with unrealized losses $ 286,063 $ (3,290 ) 172 $ 35,209 $ (1,189 ) 4 $ 321,272 $ (4,479 ) 176
Contractual Maturities of Debt Securities	The following tables set forth information with regard to contractual maturities of debt securities at June 30, 2017: (In thousands) Amortized cost Estimated fair value AFS debt securities: Within one year $ 63,613 $ 63,631 From one to five years 136,121 136,321 From five to ten years 163,507 164,061 After ten years 986,838 982,496 $ 1,350,079 $ 1,346,509 HTM debt securities: Within one year $ 34,486 $ 34,493 From one to five years 38,026 38,392 From five to ten years 122,400 123,545 After ten years 320,716 320,226 $ 515,628 $ 516,656

Allowance for Loan Losses and28

Allowance for Loan Losses and Credit Quality of Loans (Tables)	6 Months Ended
	Jun. 30, 2017
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Portfolio and Class Segments	The following table illustrates the portfolio and class segments for the Company’s loan portfolio: Portfolio Class Commercial Loans Commercial Commercial Real Estate Agricultural Agricultural Real Estate Business Banking Consumer Loans Indirect Home Equity Direct Residential Real Estate Mortgages
Allowance for Loan Losses by Portfolio	The following tables illustrate the changes in the allowance for loan losses by our portfolio segments: Three months ended June 30, (In thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of March 31, 2017 $ 24,727 $ 34,769 $ 6,204 $ - $ 65,700 Charge-offs (1,123 ) (6,261 ) (698 ) - (8,082 ) Recoveries 206 1,199 10 - 1,415 Provision 618 5,816 1,133 - 7,567 Ending Balance as of June 30, 2017 $ 24,428 $ 35,523 $ 6,649 $ - $ 66,600 Balance as of March 31, 2016 $ 25,299 $ 31,035 $ 7,984 $ - $ 64,318 Charge-offs (649 ) (4,950 ) (268 ) - (5,867 ) Recoveries 339 907 91 - 1,337 Provision 233 4,479 68 - 4,780 Ending Balance as of June 30, 2016 $ 25,222 $ 31,471 $ 7,875 $ - $ 64,568 Six months ended June 30, Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of December 31, 2016 $ 25,444 $ 33,375 $ 6,381 $ - $ 65,200 Charge-offs (2,417 ) (12,763 ) (1,296 ) - (16,476 ) Recoveries 653 2,234 43 - 2,930 Provision 748 12,677 1,521 - 14,946 Ending Balance as of June 30, 2017 $ 24,428 $ 35,523 $ 6,649 $ - $ 66,600 Balance as of December 31, 2015 $ 25,545 $ 29,253 $ 7,960 $ 260 $ 63,018 Charge-offs (1,086 ) (10,363 ) (977 ) - (12,426 ) Recoveries 1,104 1,881 113 - 3,098 Provision (341 ) 10,700 779 (260 ) 10,878 Ending Balance as of June 30, 2016 $ 25,222 $ 31,471 $ 7,875 $ - $ 64,568 The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments: As of June 30, 2017 (In thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Total Allowance for loan losses $ 24,428 $ 35,523 $ 6,649 $ 66,600 Allowance for loans individually evaluated for impairment 461 - - 461 Allowance for loans collectively evaluated for impairment $ 23,967 $ 35,523 $ 6,649 $ 66,139 Ending balance of loans $ 2,906,314 $ 2,185,790 $ 1,275,807 $ 6,367,911 Ending balance of originated loans individually evaluated for impairment 9,321 8,214 6,429 23,964 Ending balance of acquired loans collectively evaluated for impairment 222,519 52,539 186,214 461,272 Ending balance of originated loans collectively evaluated for impairment $ 2,674,474 $ 2,125,037 $ 1,083,164 $ 5,882,675 As of December 31, 2016 Allowance for loan losses $ 25,444 $ 33,375 $ 6,381 $ 65,200 Allowance for loans individually evaluated for impairment 1,517 - - 1,517 Allowance for loans collectively evaluated for impairment $ 23,927 $ 33,375 $ 6,381 $ 63,683 Ending balance of loans $ 2,786,002 $ 2,149,441 $ 1,262,614 $ 6,198,057 Ending balance of originated loans individually evaluated for impairment 13,070 8,488 6,111 27,669 Ending balance of acquired loans individually evaluated for impairment 1,205 - - 1,205 Ending balance of acquired loans collectively evaluated for impairment 236,413 63,005 199,471 498,889 Ending balance of originated loans collectively evaluated for impairment $ 2,535,314 $ 2,077,948 $ 1,057,032 $ 5,670,294
Past Due and Nonperforming Loans by Loan Class	The following tables set forth information with regard to past due and nonperforming loans by loan class: As of June 30, 2017 (In thousands) 31-60 Days Past Due Accruing 61-90 Days Past Due Accruing Greater Than 90 Days Past Due Accruing Total Past Due Accruing Nonaccrual Current Recorded Total Loans ORIGINATED Commercial Loans: Commercial $ 35 $ 530 $ - $ 565 $ 5,118 $ 756,087 $ 761,770 Commercial Real Estate 1,621 631 - 2,252 1,928 1,371,367 1,375,547 Agricultural - - - - 630 37,025 37,655 Agricultural Real Estate - - - - 1,696 30,329 32,025 Business Banking 1,637 309 - 1,946 4,379 470,473 476,798 Total Commercial Loans 3,293 1,470 - 4,763 13,751 2,665,281 2,683,795 Consumer Loans: Indirect 16,770 4,188 2,319 23,277 1,835 1,589,934 1,615,046 Home Equity 2,480 701 354 3,535 2,811 448,502 454,848 Direct 197 115 38 350 80 62,927 63,357 Total Consumer Loans 19,447 5,004 2,711 27,162 4,726 2,101,363 2,133,251 Residential Real Estate Mortgages 3,051 974 136 4,161 7,007 1,078,425 1,089,593 Total Originated Loans $ 25,791 $ 7,448 $ 2,847 $ 36,086 $ 25,484 $ 5,845,069 $ 5,906,639 ACQUIRED Commercial Loans: Commercial $ - $ - $ - $ - $ - $ 51,179 $ 51,179 Commercial Real Estate - 294 - 294 619 124,490 125,403 Business Banking 612 - - 612 783 44,542 45,937 Total Commercial Loans 612 294 - 906 1,402 220,211 222,519 Consumer Loans: Indirect 48 3 1 52 37 3,551 3,640 Home Equity 266 63 - 329 183 45,494 46,006 Direct 29 - 1 30 12 2,851 2,893 Total Consumer Loans 343 66 2 411 232 51,896 52,539 Residential Real Estate Mortgages 5 140 - 145 2,016 184,053 186,214 Total Acquired Loans $ 960 $ 500 $ 2 $ 1,462 $ 3,650 $ 456,160 $ 461,272 Total Loans $ 26,751 $ 7,948 $ 2,849 $ 37,548 $ 29,134 $ 6,301,229 $ 6,367,911 As of December 31, 2016 (In thousands) 31-60 Days Past Due Accruing 61-90 Days Past Due Accruing Greater Than 90 Days Past Due Accruing Total Past Due Accruing Nonaccrual Current Recorded Total Loans ORIGINATED Commercial Loans: Commercial $ 33 $ 5 $ - $ 38 $ 2,964 $ 650,568 $ 653,570 Commercial Real Estate - - - - 7,935 1,343,854 1,351,789 Agricultural - - - - 730 37,186 37,916 Agricultural Real Estate - - - - 1,803 30,619 32,422 Business Banking 1,609 318 - 1,927 4,860 465,900 472,687 Total Commercial Loans 1,642 323 - 1,965 18,292 2,528,127 2,548,384 Consumer Loans: Indirect 19,253 4,185 2,499 25,937 2,145 1,538,593 1,566,675 Home Equity 3,416 1,065 528 5,009 2,851 448,797 456,657 Direct 452 125 20 597 107 62,400 63,104 Total Consumer Loans 23,121 5,375 3,047 31,543 5,103 2,049,790 2,086,436 Residential Real Estate Mortgages 2,725 172 1,406 4,303 6,682 1,052,158 1,063,143 Total Originated Loans $ 27,488 $ 5,870 $ 4,453 $ 37,811 $ 30,077 $ 5,630,075 $ 5,697,963 ACQUIRED Commercial Loans: Commercial $ - $ - $ - $ - $ - $ 49,447 $ 49,447 Commercial Real Estate - - - - 1,891 135,398 137,289 Business Banking 236 - - 236 804 49,842 50,882 Total Commercial Loans 236 - - 236 2,695 234,687 237,618 Consumer Loans: Indirect 100 5 - 105 47 8,541 8,693 Home Equity 254 53 30 337 237 50,553 51,127 Direct 30 2 - 32 20 3,133 3,185 Total Consumer Loans 384 60 30 474 304 62,227 63,005 Residential Real Estate Mortgages 609 28 327 964 2,636 195,871 199,471 Total Acquired Loans $ 1,229 $ 88 $ 357 $ 1,674 $ 5,635 $ 492,785 $ 500,094 Total Loans $ 28,717 $ 5,958 $ 4,810 $ 39,485 $ 35,712 $ 6,122,860 $ 6,198,057
Impaired Loans and Specific Reserve Allocations	The following table provides information on loans specifically evaluated for impairment: June 30, 2017 December 31, 2016 (In thousands) Recorded Investment Balance (Book) Unpaid Principal Balance (Legal) Related Allowance Recorded Investment Balance (Book) Unpaid Principal Balance (Legal) Related Allowance ORIGINATED With no related allowance recorded: Commercial Loans: Commercial $ 3,303 $ 3,436 $ 1,278 $ 1,697 Commercial Real Estate 2,614 2,647 3,816 3,841 Agricultural 115 125 130 137 Agricultural Real Estate 1,476 1,635 1,434 1,567 Business Banking 964 1,056 655 728 Total Commercial Loans 8,472 8,899 7,313 7,970 Consumer Loans: Indirect 31 31 5 16 Home Equity 8,064 8,900 8,483 9,429 Direct 119 119 - - Total Consumer Loans 8,214 9,050 8,488 9,445 Residential Real Estate Mortgages 6,429 7,245 6,111 6,906 Total $ 23,115 $ 25,194 $ 21,912 $ 24,321 With an allowance recorded: Commercial Loans: Commercial 695 700 $ 350 - - $ - Commercial Real Estate 79 83 50 5,553 5,736 735 Agricultural 29 31 30 49 49 37 Agricultural Real Estate 46 48 31 155 155 54 Total Commercial Loans $ 849 $ 862 $ 461 $ 5,757 $ 5,940 $ 826 ACQUIRED With an allowance recorded: Commercial Loans: Commercial Real Estate - - - 1,205 1,321 691 Total Commercial Loans $ - $ - $ - $ 1,205 $ 1,321 $ 691 Total: $ 23,964 $ 26,056 $ 461 $ 28,874 $ 31,582 $ 1,517 The following tables summarize the average recorded investments on impaired loans specifically evaluated for impairment and the interest income recognized: For the three months ended June 30, 2017 June 30, 2016 (In thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans: Commercial $ 3,931 $ - $ 3,126 $ - Commercial Real Estate 3,243 1 15,278 - Agricultural 157 1 18 - Agricultural Real Estate 1,549 10 610 11 Business Banking 890 3 969 6 Consumer Loans: Indirect 25 1 9 - Home Equity 8,205 110 8,223 120 Direct 120 - - - Residential Real Estate Mortgage 6,388 68 6,203 67 Total Originated $ 24,508 $ 194 $ 34,436 $ 204 ACQUIRED Commercial Loans: Commercial Real Estate - - 1,205 - Total Acquired $ - $ - $ 1,205 $ - Total Loans $ 24,508 $ 194 $ 35,641 $ 204 For the six months ended June 30, 2017 June 30, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans: Commercial $ 3,419 $ - $ 2,972 $ - Commercial Real Estate 4,584 45 14,264 74 Agricultural 165 1 98 1 Agricultural Real Estate 1,564 21 613 22 Business Banking 788 5 973 12 Consumer Loans: Indirect 16 1 10 - Home Equity 8,310 220 8,093 241 Direct 120 - - - Residential Real Estate Mortgage 6,308 129 6,154 134 Total Originated $ 25,274 $ 422 $ 33,177 $ 484 ACQUIRED Commercial Loans: Commercial Real Estate 172 - 1,205 - Total Acquired $ 172 $ - $ 1,205 $ - Total Loans $ 25,446 $ 422 $ 34,382 $ 484
Financing Receivable Credit Quality by Loan Class	The following tables illustrate the Company’s credit quality by loan class: As of June 30, 2017 (In thousands) ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 708,569 $ 1,318,522 $ 32,258 $ 24,525 $ 2,083,874 Special Mention 24,829 31,829 2,520 2,501 61,679 Substandard 28,372 25,196 2,872 4,999 61,439 Doubtful - - 5 - 5 Total $ 761,770 $ 1,375,547 $ 37,655 $ 32,025 $ 2,206,997 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 463,897 $ 463,897 Classified 12,901 12,901 Total $ 476,798 $ 476,798 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,610,892 $ 451,683 $ 63,239 $ 2,125,814 Nonperforming 4,154 3,165 118 7,437 Total $ 1,615,046 $ 454,848 $ 63,357 $ 2,133,251 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 1,082,450 $ 1,082,450 Nonperforming 7,143 7,143 Total $ 1,089,593 $ 1,089,593 As of June 30, 2017 (In thousands) ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 44,517 $ 116,214 $ 160,731 Special Mention 5,719 2,175 7,894 Substandard 943 7,014 7,957 Total $ 51,179 $ 125,403 $ 176,582 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 42,499 $ 42,499 Classified 3,438 3,438 Total $ 45,937 $ 45,937 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 3,603 $ 45,823 $ 2,881 $ 52,307 Nonperforming 37 183 12 232 Total $ 3,640 $ 46,006 $ 2,893 $ 52,539 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 184,198 $ 184,198 Nonperforming 2,016 2,016 Total $ 186,214 $ 186,214 As of December 31, 2016 (In thousands) ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 616,829 $ 1,288,409 $ 36,762 $ 28,912 $ 1,970,912 Special Mention 7,750 31,053 25 1,896 40,724 Substandard 28,991 32,327 1,124 1,614 64,056 Doubtful - - 5 - 5 Total $ 653,570 $ 1,351,789 $ 37,916 $ 32,422 $ 2,075,697 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 458,864 $ 458,864 Classified 13,823 13,823 Total $ 472,687 $ 472,687 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,562,031 $ 453,278 $ 62,977 $ 2,078,286 Nonperforming 4,644 3,379 127 8,150 Total $ 1,566,675 $ 456,657 $ 63,104 $ 2,086,436 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 1,055,055 $ 1,055,055 Nonperforming 8,088 8,088 Total $ 1,063,143 $ 1,063,143 As of December 31, 2016 (In thousands) ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 48,194 $ 127,660 $ 175,854 Special Mention 76 1,231 1,307 Substandard 1,177 7,193 8,370 Doubtful - 1,205 1,205 Total $ 49,447 $ 137,289 $ 186,736 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 47,347 $ 47,347 Classified 3,535 3,535 Total $ 50,882 $ 50,882 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 8,646 $ 50,860 $ 3,165 $ 62,671 Nonperforming 47 267 20 334 Total $ 8,693 $ 51,127 $ 3,185 $ 63,005 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 196,508 $ 196,508 Nonperforming 2,963 2,963 Total $ 199,471 $ 199,471
Troubled Debt Restructurings on Financing Receivables	The following tables illustrate the recorded investment and number of modifications for modified loans, including the recorded investment in the loans prior to a modification and the recorded investment in the loans after restructuring: Three months ended June 30, 2017 (Dollars in thousands) Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Commercial 1 $ 3,300 $ 3,239 Business Banking 1 337 333 Total Commercial 2 3,637 3,572 Consumer Indirect 3 32 31 Home Equity 1 78 78 Direct 1 120 120 Total Consumer 5 230 229 Residential Real Estate 4 346 346 Total Troubled Debt Restructurings 11 $ 4,213 $ 4,147 Three months ended June 30, 2016 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 2 $ 74 $ 73 Total Consumer 2 74 73 Residential Real Estate 2 152 151 Total Troubled Debt Restructurings 4 $ 226 $ 224 Six months ended June 30, 2017 (Dollars in thousands) Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Commercial 1 $ 3,300 $ 3,239 Business Banking 1 337 333 Total Commercial 2 3,637 3,572 Consumer Indirect 3 32 31 Home Equity 4 185 192 Direct 1 120 120 Total Consumer 8 337 343 Residential Real Estate 6 548 554 Total Troubled Debt Restructurings 16 $ 4,522 $ 4,469 Six months ended June 30, 2016 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 14 $ 1,109 $ 1,017 Total Consumer 14 1,109 1,017 Residential Real Estate 6 683 578 Total Troubled Debt Restructurings 20 $ 1,792 $ 1,595 TDRs occurring during the three and six months ended June 30, 2017 and 2016 were due to the reduction in the interest rate or extension of the term. The following table illustrates the recorded investment and number of modifications for TDRs where a concession has been made and subsequently defaulted during the period: Three months ended June 30, 2017 Three months ended June 30, 2016 (Dollars in thousands) Number of contracts Recorded Investment Number of contracts Recorded Investment Commercial Business Banking 1 $ 329 1 $ 67 Total Commercial 1 329 1 67 Consumer Indirect 1 14 - - Home Equity 13 589 10 520 Total Consumer 14 603 10 520 Residential Real Estate 4 251 6 664 Total Troubled Debt Restructurings 19 $ 1,183 17 $ 1,251 Six months ended June 30, 2017 Six months ended June 30, 2016 Number of contracts Recorded Investment Number of contracts Recorded Investment Commercial Commercial 1 $ 145 - $ - Business Banking 1 329 1 67 Total Commercial 2 474 1 67 Consumer Indirect 2 19 - - Home Equity 22 1,101 14 898 Total Consumer 24 1,120 14 898 Residential Real Estate 8 419 10 873 Total Troubled Debt Restructurings 34 $ 2,013 25 $ 1,838

Defined Benefit Post-retireme29

Defined Benefit Post-retirement Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Defined Benefit Post-retirement Plans [Abstract]
Components of Net Periodic Pension Benefits and Other Benefit Costs	The components of expense for Pension Benefits and Other Benefits are set forth below: Pension Benefits Other Benefits (In thousands) Three months ended June 30, Three months ended June 30, Components of net periodic (benefit) cost: 2017 2016 2017 2016 Service cost $ 402 $ 560 $ 3 $ 4 Interest cost 1,042 1,051 86 94 Expected return on plan assets (1,985 ) (1,835 ) - - Net amortization 415 483 20 29 Total (benefit) cost $ (126 ) $ 259 $ 109 $ 127 Pension Benefits Other Benefits Six months ended June 30, Six months ended June 30, Components of net periodic (benefit) cost: 2017 2016 2017 2016 Service cost $ 804 $ 1,120 $ 6 $ 8 Interest cost 2,084 2,102 172 188 Expected return on plan assets (3,970 ) (3,670 ) - - Net amortization 831 966 40 58 Total (benefit) cost $ (251 ) $ 518 $ 218 $ 254

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings per Share	The following is a reconciliation of basic and diluted EPS for the periods presented in the unaudited interim consolidated statements of income: Three months ended June 30, 2017 2016 (In thousands, except per share data) Basic EPS: Weighted average common shares outstanding 43,579 43,099 Net income available to common stockholders $ 21,359 $ 19,909 Basic EPS $ 0.49 $ 0.46 Diluted EPS: Weighted average common shares outstanding 43,579 43,009 Dilutive effect of common stock options and restricted stock 322 354 Weighted average common shares and common share equivalents 43,901 43,363 Net income available to common stockholders $ 21,359 $ 19,909 Diluted EPS $ 0.49 $ 0.46 Six months ended June 30, 2017 2016 Basic EPS: Weighted average common shares outstanding 43,546 43,220 Net income available to common stockholders $ 41,638 $ 38,800 Basic EPS $ 0.96 $ 0.90 Diluted EPS: Weighted average common shares outstanding 43,546 43,220 Dilutive effect of common stock options and restricted stock 340 364 Weighted average common shares and common share equivalents 43,886 43,584 Net income available to common stockholders $ 41,638 $ 38,800 Diluted EPS $ 0.95 $ 0.89

Reclassification Adjustments 31

Reclassification Adjustments Out of Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2017
Reclassification Adjustments Out of Other Comprehensive Income [Abstract]
Reclassification Out of Accumulated Other Comprehensive Income	The following table summarizes the reclassification adjustments out of accumulated other comprehensive income: Detail About Accumulated Other Comprehensive Income Components Amount Reclassified From Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Comprehensive Income (In thousands) Three months ended June 30, 2017 June 30, 2016 AFS Securities: Gains on AFS securities $ (2 ) $ (1 ) Net securities gains Amortization of unrealized gains related to securities transfer 225 280 Interest income Income tax (expense) (85 ) (108 ) Income tax (expense) Net of tax $ 138 $ 171 Pension and other benefits: Amortization of net losses $ 435 $ 515 Salaries and employee benefits Amortization of prior service costs - (3 ) Salaries and employee benefits Income tax (expense) (166 ) (199 ) Income tax (expense) Net of tax $ 269 $ 313 Total reclassifications during the period, net of tax $ 407 $ 484 Detail About Accumulated Other Comprehensive Income Components Amount Reclassified From Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Comprehensive Income Six months ended June 30, 2017 June 30, 2016 AFS Securities: Gains on AFS securities $ (2 ) $ (30 ) Net securities gains Amortization of unrealized gains related to securities transfer 463 576 Interest income Impairment write-down of equity security 1,312 - Other noninterest income Income tax (expense) (176 ) (213 ) Income tax (expense) Net of tax $ 1,597 $ 333 Pension and other benefits: Amortization of net losses $ 870 $ 1,030 Salaries and employee benefits Amortization of prior service costs - (6 ) Salaries and employee benefits Income tax (expense) (332 ) (398 ) Income tax (expense) Net of tax $ 538 $ 626 Total reclassifications during the period, net of tax $ 2,135 $ 959

Fair Value Measurements and F32

Fair Value Measurements and Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis	The following tables set forth the Company’s financial assets and liabilities measured on a recurring basis that were accounted for at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: (In thousands) Level 1 Level 2 Level 3 Balance as of June 30, 2017 Assets: AFS securities: Federal agency $ - $ 159,520 $ - $ 159,520 State & municipal - 44,020 - 44,020 Mortgage-backed - 564,061 - 564,061 Collateralized mortgage obligations - 578,908 - 578,908 Other securities 10,744 8,268 - 19,012 Total AFS securities $ 10,744 $ 1,354,777 $ - $ 1,365,521 Trading securities 10,406 - - 10,406 Derivatives - 5,631 - 5,631 Total $ 21,150 $ 1,360,408 $ - $ 1,381,558 Liabilities: Derivatives $ - $ 2,960 $ - $ 2,960 Total $ - $ 2,960 $ - $ 2,960 (In thousands) Level 1 Level 2 Level 3 Balance as of December 31, 2016 Assets: AFS securities: Federal agency $ - $ 174,408 $ - $ 174,408 State & municipal - 46,726 - 46,726 Mortgage-backed - 529,844 - 529,844 Collateralized mortgage obligations - 566,573 - 566,573 Other securities 11,493 9,246 - 20,739 Total AFS securities $ 11,493 $ 1,326,797 $ - $ 1,338,290 Trading securities 9,259 - - 9,259 Derivatives - 3,210 - 3,210 Total $ 20,752 $ 1,330,007 $ - $ 1,350,759 Liabilities: Derivatives $ - $ 506 $ - $ 506 Total $ - $ 506 $ - $ 506
Fair Value of Financial Instruments by Balance Sheet Grouping	The following table sets forth information with regard to estimated fair values of financial instruments. This table excludes financial instruments for which the carrying amount approximates fair value. Financial instruments for which the fair value approximates carrying value include cash and cash equivalents, securities AFS, trading securities, accrued interest receivable, non-maturity deposits, short-term borrowings, accrued interest payable and interest rate swaps. June 30, 2017 December 31, 2016 (In thousands) Fair Value Hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value Financial assets HTM securities 2 $ 515,628 $ 516,656 $ 527,948 $ 525,050 Net loans 3 6,301,311 6,453,713 6,132,857 6,273,233 Financial liabilities Time deposits 2 $ 832,449 $ 828,947 $ 872,411 $ 868,153 Long-term debt 2 88,958 89,064 104,087 104,113 Junior subordinated debt 2 101,196 103,499 101,196 102,262

Securities, Available for Sale

Securities, Available for Sale (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)Position	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Position	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)Position
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,363,616		$ 1,363,616		$ 1,341,059
Unrealized gains	10,518		10,518		11,097
Unrealized losses	8,613		8,613		13,866
Estimated fair value	1,365,521		1,365,521		1,338,290
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	799,017		799,017		902,506
12 months or longer	11,338		11,338		5,831
Total	810,355		810,355		908,337
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(8,364)		(8,364)		(12,347)
12 months or longer	(249)		(249)		(1,519)
Total	$ (8,613)		$ (8,613)		$ (13,866)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	153		153		171
12 months or longer | Position	8		8		7
Total | Position	161		161		178
OTTI loss realized on equity investment	$ 0	$ 0	$ 1,300	$ 0
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	63,613		63,613
From one to five years	136,121		136,121
From five to ten years	163,507		163,507
After ten years	986,838		986,838
Amortized cost	1,350,079		1,350,079
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	63,631		63,631
From one to five years	136,321		136,321
From five to ten years	164,061		164,061
After ten years	982,496		982,496
Fair value	1,346,509		1,346,509
Federal Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	159,999		159,999		$ 175,135
Unrealized gains	46		46		78
Unrealized losses	525		525		805
Estimated fair value	159,520		159,520		174,408
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	109,778		109,778		119,363
12 months or longer	0		0		0
Total	109,778		109,778		119,363
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(525)		(525)		(805)
12 months or longer	0		0		0
Total	$ (525)		$ (525)		$ (805)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	9		9		10
12 months or longer | Position	0		0		0
Total | Position	9		9		10
State & Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 44,023		$ 44,023		$ 47,053
Unrealized gains	136		136		153
Unrealized losses	139		139		480
Estimated fair value	44,020		44,020		46,726
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	23,771		23,771		31,873
12 months or longer	1,052		1,052		483
Total	24,823		24,823		32,356
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(120)		(120)		(478)
12 months or longer	(19)		(19)		(2)
Total	$ (139)		$ (139)		$ (480)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	36		36		55
12 months or longer | Position	1		1		1
Total | Position	37		37		56
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 210,648		$ 210,648		$ 277,524
12 months or longer	963		963		985
Total	211,611		211,611		278,509
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(1,618)		(1,618)		(2,668)
12 months or longer	(13)		(13)		(13)
Total	$ (1,631)		$ (1,631)		$ (2,681)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	46		46		49
12 months or longer | Position	4		4		4
Total | Position	50		50		53
Mortgage-Backed, Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 544,616		$ 544,616		$ 513,814
Unrealized gains	3,503		3,503		3,345
Unrealized losses	1,414		1,414		2,492
Estimated fair value	546,705		546,705		514,667
Mortgage-Backed, U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	17,167		17,167		14,955
Unrealized gains	406		406		411
Unrealized losses	217		217		189
Estimated fair value	17,356		17,356		15,177
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	452,830		452,830		473,746
12 months or longer	6,347		6,347		0
Total	459,177		459,177		473,746
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(6,091)		(6,091)		(8,396)
12 months or longer	(88)		(88)		0
Total	$ (6,179)		$ (6,179)		$ (8,396)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	61		61		57
12 months or longer | Position	2		2		0
Total | Position	63		63		57
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 528,561		$ 528,561		$ 513,431
Unrealized gains	622		622		532
Unrealized losses	5,551		5,551		7,688
Estimated fair value	523,632		523,632		506,275
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	55,713		55,713		60,822
Unrealized gains	191		191		184
Unrealized losses	628		628		708
Estimated fair value	55,276		55,276		60,298
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	13,537		13,537		15,849
Unrealized gains	5,614		5,614		6,394
Unrealized losses	139		139		1,504
Estimated fair value	19,012		19,012		20,739
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	1,990		1,990		0
12 months or longer	2,976		2,976		4,363
Total	4,966		4,966		4,363
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(10)		(10)		0
12 months or longer	(129)		(129)		(1,504)
Total	$ (139)		$ (139)		$ (1,504)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1		1		0
12 months or longer | Position	1		1		2
Total | Position	2		2		2

Securities, Held to Maturity (D

Securities, Held to Maturity (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)Position	Jun. 30, 2017USD ($)Position	Dec. 31, 2016USD ($)Position	Jun. 30, 2016USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 515,628	$ 515,628	$ 527,948
Unrealized gains	3,507	3,507	1,581
Unrealized losses	2,479	2,479	4,479
Estimated fair value	516,656	516,656	525,050
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	117,750	117,750	286,063
12 months or longer	35,657	35,657	35,209
Total	153,407	153,407	321,272
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(1,423)	(1,423)	(3,290)
12 months or longer	(1,056)	(1,056)	(1,189)
Total	$ (2,479)	$ (2,479)	$ (4,479)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	46	46	172
12 months or longer | Position	9	9	4
Total | Position	55	55	176
Held-to-maturity securities sold, amortized cost	$ 800	$ 800		$ 0
Held-to-maturity securities sold, unrealized loss	(2)	(2)
Amortized costs of securities held to maturity pledged to secure public deposits	1,500,000	1,500,000	$ 1,500,000
Amortized costs of securities held to maturity pledged as collateral for repurchase agreements	234,400	234,400	235,600
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	34,486	34,486
From one to five years	38,026	38,026
From five to ten years	122,400	122,400
After ten years	320,716	320,716
Amortized cost	515,628	515,628	527,948
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	34,493	34,493
From one to five years	38,392	38,392
From five to ten years	123,545	123,545
After ten years	320,226	320,226
Fair value	516,656	516,656	525,050
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	52,892	52,892	95,492
12 months or longer	0	0	0
Total	52,892	52,892	95,492
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(878)	(878)	(1,176)
12 months or longer	0	0	0
Total	$ (878)	$ (878)	$ (1,176)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	4	4	5
12 months or longer | Position	0	0	0
Total | Position	4	4	5
Mortgage-Backed, Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 102,651	$ 102,651	$ 96,668
Unrealized gains	61	61	0
Unrealized losses	878	878	1,176
Estimated fair value	101,834	101,834	95,492
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized cost	102,651	102,651	96,668
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Fair value	101,834	101,834	95,492
Mortgage-Backed, U.S. Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	474	474	533
Unrealized gains	69	69	87
Unrealized losses	0	0	0
Estimated fair value	543	543	620
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized cost	474	474	533
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Fair value	543	543	620
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	40,458	40,458	108,587
12 months or longer	32,969	32,969	35,209
Total	73,427	73,427	143,796
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(148)	(148)	(319)
12 months or longer	(920)	(920)	(1,189)
Total	$ (1,068)	$ (1,068)	$ (1,508)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	6	6	12
12 months or longer | Position	4	4	4
Total | Position	10	10	16
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 205,806	$ 205,806	$ 225,213
Unrealized gains	1,280	1,280	1,060
Unrealized losses	1,068	1,068	1,508
Estimated fair value	206,018	206,018	224,765
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized cost	205,806	205,806	225,213
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Fair value	206,018	206,018	224,765
State & Municipal [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	206,697	206,697	205,534
Unrealized gains	2,097	2,097	434
Unrealized losses	533	533	1,795
Estimated fair value	208,261	208,261	204,173
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	24,400	24,400	81,984
12 months or longer	2,688	2,688	0
Total	27,088	27,088	81,984
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(397)	(397)	(1,795)
12 months or longer	(136)	(136)	0
Total	$ (533)	$ (533)	$ (1,795)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	36	36	155
12 months or longer | Position	5	5	0
Total | Position	41	41	155
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized cost	$ 206,697	$ 206,697	$ 205,534
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Fair value	$ 208,261	$ 208,261	$ 204,173

Allowance for Loan Losses and35

Allowance for Loan Losses and Credit Quality of Loans (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)Segment	Dec. 31, 2016USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan portfolio segments | Segment	3
Commercial Loans [Member] | Commercial Real Estate [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan amount, percentage of appraised value or purchase price of the property	80.00%
Commercial Loans [Member] | Agricultural Real Estate [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan amount, percentage of appraised value or purchase price of the property	75.00%
Commercial Loans [Member] | Business Banking [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Business banking loans, amount available	$ 0.8
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unsecured consumer loans originated through relationship with leading national technology-driven consumer lending company	$ 398.7	$ 374.9
Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of automobile financing to indirect relationships with dealers	70.00%
Consumer Loans [Member] | Indirect [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal repayment term of loan	3 years
Consumer Loans [Member] | Indirect [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal repayment term of loan	6 years
Consumer Loans [Member] | Home Equity [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan amount, percentage of equity in property	85.00%
Consumer Loans [Member] | Direct [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal repayment term of loan	1 year
Consumer Loans [Member] | Direct [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal repayment term of loan	10 years
Residential Real Estate Mortgages [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan amount, percentage of appraised value or purchase price of the property	85.00%

Allowance for Loan Losses and36

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 65,700	$ 64,318	$ 65,200	$ 63,018
Charge-offs	(8,082)	(5,867)	(16,476)	(12,426)
Recoveries	1,415	1,337	2,930	3,098
Provision	7,567	4,780	14,946	10,878
Balance, end of period	66,600	64,568	66,600	64,568
Allowance for loan losses for acquired loan portfolio	0	800	0	800
Provision expense and net charge-offs related to acquired loans	300	100	700	400
Commercial Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	24,727	25,299	25,444	25,545
Charge-offs	(1,123)	(649)	(2,417)	(1,086)
Recoveries	206	339	653	1,104
Provision	618	233	748	(341)
Balance, end of period	24,428	25,222	24,428	25,222
Consumer Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	34,769	31,035	33,375	29,253
Charge-offs	(6,261)	(4,950)	(12,763)	(10,363)
Recoveries	1,199	907	2,234	1,881
Provision	5,816	4,479	12,677	10,700
Balance, end of period	35,523	31,471	35,523	31,471
Residential Real Estate Mortgages [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	6,204	7,984	6,381	7,960
Charge-offs	(698)	(268)	(1,296)	(977)
Recoveries	10	91	43	113
Provision	1,133	68	1,521	779
Balance, end of period	6,649	7,875	6,649	7,875
Unallocated [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	0	0	0	260
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	0	0	0	(260)
Balance, end of period	$ 0	$ 0	$ 0	$ 0

Allowance for Loan Losses and37

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	$ 66,600	$ 65,700	$ 65,200	$ 64,568	$ 64,318	$ 63,018
Allowance for loans individually evaluated for impairment	461		1,517
Allowance for loans collectively evaluated for impairment	66,139		63,683
Ending balance of loans	6,367,911		6,198,057
Commercial Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	24,428	24,727	25,444	25,222	25,299	25,545
Allowance for loans individually evaluated for impairment	461		1,517
Allowance for loans collectively evaluated for impairment	23,967		23,927
Ending balance of loans	2,906,314		2,786,002
Consumer Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	35,523	34,769	33,375	31,471	31,035	29,253
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	35,523		33,375
Ending balance of loans	2,185,790		2,149,441
Residential Real Estate Mortgages [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	6,649	6,204	6,381	7,875	7,984	7,960
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	6,649		6,381
Ending balance of loans	1,275,807		1,262,614
Unallocated [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	0	$ 0	0	$ 0	$ 0	$ 260
Originated Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	5,906,639		5,697,963
Ending balance of loans individually evaluated for impairment	23,964		27,669
Ending balance of loans collectively evaluated for impairment	5,882,675		5,670,294
Originated Loans [Member] | Commercial Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	2,683,795		2,548,384
Ending balance of loans individually evaluated for impairment	9,321		13,070
Ending balance of loans collectively evaluated for impairment	2,674,474		2,535,314
Originated Loans [Member] | Consumer Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	2,133,251		2,086,436
Ending balance of loans individually evaluated for impairment	8,214		8,488
Ending balance of loans collectively evaluated for impairment	2,125,037		2,077,948
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	1,089,593		1,063,143
Ending balance of loans individually evaluated for impairment	6,429		6,111
Ending balance of loans collectively evaluated for impairment	1,083,164		1,057,032
Acquired Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	461,272		500,094
Ending balance of loans individually evaluated for impairment			1,205
Ending balance of loans collectively evaluated for impairment	461,272		498,889
Acquired Loans [Member] | Commercial Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	222,519		237,618
Ending balance of loans individually evaluated for impairment			1,205
Ending balance of loans collectively evaluated for impairment	222,519		236,413
Acquired Loans [Member] | Consumer Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	52,539		63,005
Ending balance of loans individually evaluated for impairment			0
Ending balance of loans collectively evaluated for impairment	52,539		63,005
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	186,214		199,471
Ending balance of loans individually evaluated for impairment			0
Ending balance of loans collectively evaluated for impairment	$ 186,214		$ 199,471

Allowance for Loan Losses and38

Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Aging [Abstract]
Minimum number of days past due for nonaccrual loan status	90 days
Total Past Due Accruing	$ 37,548	$ 39,485
Non-Accrual	29,134	35,712
Current	6,301,229	6,122,860
Recorded Total Loans	6,367,911	6,198,057
31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	26,751	28,717
61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	7,948	5,958
Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,849	4,810
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	2,906,314	2,786,002
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	2,185,790	2,149,441
Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	1,275,807	1,262,614
Originated Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	36,086	37,811
Non-Accrual	25,484	30,077
Current	5,845,069	5,630,075
Recorded Total Loans	5,906,639	5,697,963
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	25,791	27,488
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	7,448	5,870
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,847	4,453
Originated Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,763	1,965
Non-Accrual	13,751	18,292
Current	2,665,281	2,528,127
Recorded Total Loans	2,683,795	2,548,384
Originated Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,293	1,642
Originated Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,470	323
Originated Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	565	38
Non-Accrual	5,118	2,964
Current	756,087	650,568
Recorded Total Loans	761,770	653,570
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	35	33
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	530	5
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,252	0
Non-Accrual	1,928	7,935
Current	1,371,367	1,343,854
Recorded Total Loans	1,375,547	1,351,789
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,621	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	631	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Non-Accrual	630	730
Current	37,025	37,186
Recorded Total Loans	37,655	37,916
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Non-Accrual	1,696	1,803
Current	30,329	30,619
Recorded Total Loans	32,025	32,422
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,946	1,927
Non-Accrual	4,379	4,860
Current	470,473	465,900
Recorded Total Loans	476,798	472,687
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,637	1,609
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	309	318
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	27,162	31,543
Non-Accrual	4,726	5,103
Current	2,101,363	2,049,790
Recorded Total Loans	2,133,251	2,086,436
Originated Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	19,447	23,121
Originated Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,004	5,375
Originated Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,711	3,047
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	23,277	25,937
Non-Accrual	1,835	2,145
Current	1,589,934	1,538,593
Recorded Total Loans	1,615,046	1,566,675
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	16,770	19,253
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,188	4,185
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,319	2,499
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,535	5,009
Non-Accrual	2,811	2,851
Current	448,502	448,797
Recorded Total Loans	454,848	456,657
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,480	3,416
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	701	1,065
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	354	528
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	350	597
Non-Accrual	80	107
Current	62,927	62,400
Recorded Total Loans	63,357	63,104
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	197	452
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	115	125
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	38	20
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,161	4,303
Non-Accrual	7,007	6,682
Current	1,078,425	1,052,158
Recorded Total Loans	1,089,593	1,063,143
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,051	2,725
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	974	172
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	136	1,406
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,462	1,674
Non-Accrual	3,650	5,635
Current	456,160	492,785
Recorded Total Loans	461,272	500,094
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	960	1,229
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	500	88
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2	357
Acquired Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	906	236
Non-Accrual	1,402	2,695
Current	220,211	234,687
Recorded Total Loans	222,519	237,618
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	612	236
Acquired Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	294	0
Acquired Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Non-Accrual	0	0
Current	51,179	49,447
Recorded Total Loans	51,179	49,447
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	294	0
Non-Accrual	619	1,891
Current	124,490	135,398
Recorded Total Loans	125,403	137,289
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	294	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	612	236
Non-Accrual	783	804
Current	44,542	49,842
Recorded Total Loans	45,937	50,882
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	612	236
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	411	474
Non-Accrual	232	304
Current	51,896	62,227
Recorded Total Loans	52,539	63,005
Acquired Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	343	384
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	66	60
Acquired Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2	30
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	52	105
Non-Accrual	37	47
Current	3,551	8,541
Recorded Total Loans	3,640	8,693
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	48	100
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3	5
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1	0
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	329	337
Non-Accrual	183	237
Current	45,494	50,553
Recorded Total Loans	46,006	51,127
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	266	254
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	63	53
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	30
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	30	32
Non-Accrual	12	20
Current	2,851	3,133
Recorded Total Loans	2,893	3,185
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	29	30
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	2
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1	0
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	145	964
Non-Accrual	2,016	2,636
Current	184,053	195,871
Recorded Total Loans	186,214	199,471
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5	609
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	140	28
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	$ 0	$ 327

Allowance for Loan Losses and39

Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Threshold balance for classified loans to be evaluated individually for impairment	$ 800
Total [Abstract]
Recorded investment balance (book)	23,964	$ 28,874
Unpaid principal balance (legal)	26,056	31,582
Related allowance	461	1,517
Originated Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	23,115	21,912
Unpaid principal balance (legal)	25,194	24,321
Originated Loans [Member] | Commercial Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,472	7,313
Unpaid principal balance (legal)	8,899	7,970
With an allowance recorded [Abstract]
Recorded investment balance (book)	849	5,757
Unpaid principal balance (legal)	862	5,940
Total [Abstract]
Related allowance	461	826
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	3,303	1,278
Unpaid principal balance (legal)	3,436	1,697
With an allowance recorded [Abstract]
Recorded investment balance (book)	695	0
Unpaid principal balance (legal)	700	0
Total [Abstract]
Related allowance	350	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	2,614	3,816
Unpaid principal balance (legal)	2,647	3,841
With an allowance recorded [Abstract]
Recorded investment balance (book)	79	5,553
Unpaid principal balance (legal)	83	5,736
Total [Abstract]
Related allowance	50	735
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	115	130
Unpaid principal balance (legal)	125	137
With an allowance recorded [Abstract]
Recorded investment balance (book)	29	49
Unpaid principal balance (legal)	31	49
Total [Abstract]
Related allowance	30	37
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	1,476	1,434
Unpaid principal balance (legal)	1,635	1,567
With an allowance recorded [Abstract]
Recorded investment balance (book)	46	155
Unpaid principal balance (legal)	48	155
Total [Abstract]
Related allowance	31	54
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	964	655
Unpaid principal balance (legal)	1,056	728
Originated Loans [Member] | Consumer Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,214	8,488
Unpaid principal balance (legal)	9,050	9,445
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	31	5
Unpaid principal balance (legal)	31	16
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,064	8,483
Unpaid principal balance (legal)	8,900	9,429
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	119	0
Unpaid principal balance (legal)	119	0
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	6,429	6,111
Unpaid principal balance (legal)	7,245	6,906
Acquired Loans [Member] | Commercial Loans [Member]
With an allowance recorded [Abstract]
Recorded investment balance (book)	0	1,205
Unpaid principal balance (legal)	0	1,321
Total [Abstract]
Related allowance	0	691
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
With an allowance recorded [Abstract]
Recorded investment balance (book)	0	1,205
Unpaid principal balance (legal)	0	1,321
Total [Abstract]
Related allowance	$ 0	$ 691

Allowance for Loan Losses and40

Allowance for Loan Losses and Credit Quality of Loans, Average Recorded Investments on Loans Specifically Evaluated for Impairment and Interest Income Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 24,508	$ 35,641	$ 25,446	$ 34,382
Interest income recognized	194	204	422	484
Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	24,508	34,436	25,274	33,177
Interest income recognized	194	204	422	484
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	3,931	3,126	3,419	2,972
Interest income recognized	0	0	0	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	3,243	15,278	4,584	14,264
Interest income recognized	1	0	45	74
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	157	18	165	98
Interest income recognized	1	0	1	1
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	1,549	610	1,564	613
Interest income recognized	10	11	21	22
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	890	969	788	973
Interest income recognized	3	6	5	12
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	25	9	16	10
Interest income recognized	1	0	1	0
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,205	8,223	8,310	8,093
Interest income recognized	110	120	220	241
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	120	0	120	0
Interest income recognized	0	0	0	0
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	6,388	6,203	6,308	6,154
Interest income recognized	68	67	129	134
Acquired Loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	1,205	172	1,205
Interest income recognized	0	0	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	1,205	172	1,205
Interest income recognized	$ 0	$ 0	$ 0	$ 0

Allowance for Loan Losses and41

Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 6,367,911	$ 6,198,057
Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,906,314	2,786,002
Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,185,790	2,149,441
Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,275,807	1,262,614
Originated Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,906,639	5,697,963
Originated Loans [Member] | Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,683,795	2,548,384
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,206,997	2,075,697
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,083,874	1,970,912
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,679	40,724
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,439	64,056
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5	5
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	761,770	653,570
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	708,569	616,829
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	24,829	7,750
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	28,372	28,991
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	0	0
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,375,547	1,351,789
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,318,522	1,288,409
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	31,829	31,053
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	25,196	32,327
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	0	0
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	37,655	37,916
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	32,258	36,762
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,520	25
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,872	1,124
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5	5
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	32,025	32,422
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	24,525	28,912
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,501	1,896
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,999	1,614
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	0	0
Originated Loans [Member] | Commercial Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	476,798	472,687
Originated Loans [Member] | Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	476,798	472,687
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	463,897	458,864
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	12,901	13,823
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	476,798	472,687
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	463,897	458,864
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	12,901	13,823
Originated Loans [Member] | Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,133,251	2,086,436
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,125,814	2,078,286
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,437	8,150
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,615,046	1,566,675
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,610,892	1,562,031
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,154	4,644
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	454,848	456,657
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	451,683	453,278
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,165	3,379
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	63,357	63,104
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	63,239	62,977
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	118	127
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,089,593	1,063,143
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,082,450	1,055,055
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,143	8,088
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,089,593	1,063,143
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,082,450	1,055,055
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,143	8,088
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	461,272	500,094
Acquired Loans [Member] | Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	222,519	237,618
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	176,582	186,736
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	160,731	175,854
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,894	1,307
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,957	8,370
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable		1,205
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	51,179	49,447
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	44,517	48,194
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,719	76
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	943	1,177
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable		0
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	125,403	137,289
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	116,214	127,660
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,175	1,231
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,014	7,193
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable		1,205
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,937	50,882
Acquired Loans [Member] | Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,937	50,882
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	42,499	47,347
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,438	3,535
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,937	50,882
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	42,499	47,347
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,438	3,535
Acquired Loans [Member] | Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	52,539	63,005
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	52,307	62,671
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	232	334
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,640	8,693
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,603	8,646
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	37	47
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	46,006	51,127
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,823	50,860
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	183	267
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,893	3,185
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,881	3,165
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	12	20
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	186,214	199,471
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	184,198	196,508
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,016	2,963
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	186,214	199,471
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	184,198	196,508
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 2,016	$ 2,963

Allowance for Loan Losses and42

Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	11	4	16	20
Pre-modification outstanding recorded investment	$ 4,213	$ 226	$ 4,522	$ 1,792
Post-modification outstanding recorded investment	$ 4,147	$ 224	$ 4,469	$ 1,595
Number of TDR loans with subsequent default | Contract	19	17	34	25
Outstanding recorded investment on TDR loans with subsequent default	$ 1,183	$ 1,251	$ 2,013	$ 1,838
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	2		2
Pre-modification outstanding recorded investment	$ 3,637		$ 3,637
Post-modification outstanding recorded investment	$ 3,572		$ 3,572
Number of TDR loans with subsequent default | Contract	1	1	2	1
Outstanding recorded investment on TDR loans with subsequent default	$ 329	$ 67	$ 474	$ 67
Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	1		1
Pre-modification outstanding recorded investment	$ 3,300		$ 3,300
Post-modification outstanding recorded investment	$ 3,239		$ 3,239
Number of TDR loans with subsequent default | Contract			1	0
Outstanding recorded investment on TDR loans with subsequent default			$ 145	$ 0
Commercial Loans [Member] | Business Banking [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	1		1
Pre-modification outstanding recorded investment	$ 337		$ 337
Post-modification outstanding recorded investment	$ 333		$ 333
Number of TDR loans with subsequent default | Contract	1	1	1	1
Outstanding recorded investment on TDR loans with subsequent default	$ 329	$ 67	$ 329	$ 67
Consumer Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	5	2	8	14
Pre-modification outstanding recorded investment	$ 230	$ 74	$ 337	$ 1,109
Post-modification outstanding recorded investment	$ 229	$ 73	$ 343	$ 1,017
Number of TDR loans with subsequent default | Contract	14	10	24	14
Outstanding recorded investment on TDR loans with subsequent default	$ 603	$ 520	$ 1,120	$ 898
Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	3		3
Pre-modification outstanding recorded investment	$ 32		$ 32
Post-modification outstanding recorded investment	$ 31		$ 31
Number of TDR loans with subsequent default | Contract	1	0	2	0
Outstanding recorded investment on TDR loans with subsequent default	$ 14	$ 0	$ 19	$ 0
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	1	2	4	14
Pre-modification outstanding recorded investment	$ 78	$ 74	$ 185	$ 1,109
Post-modification outstanding recorded investment	$ 78	$ 73	$ 192	$ 1,017
Number of TDR loans with subsequent default | Contract	13	10	22	14
Outstanding recorded investment on TDR loans with subsequent default	$ 589	$ 520	$ 1,101	$ 898
Consumer Loans [Member] | Direct [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	1		1
Pre-modification outstanding recorded investment	$ 120		$ 120
Post-modification outstanding recorded investment	$ 120		$ 120
Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	4	2	6	6
Pre-modification outstanding recorded investment	$ 346	$ 152	$ 548	$ 683
Post-modification outstanding recorded investment	$ 346	$ 151	$ 554	$ 578
Number of TDR loans with subsequent default | Contract	4	6	8	10
Outstanding recorded investment on TDR loans with subsequent default	$ 251	$ 664	$ 419	$ 873

Defined Benefit Post-retireme43

Defined Benefit Post-retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Post-retirement Plans [Abstract]
Employer contributions			$ 0
Pension Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	$ 402	$ 560	804	$ 1,120
Interest cost	1,042	1,051	2,084	2,102
Expected return on plan assets	(1,985)	(1,835)	(3,970)	(3,670)
Net amortization	415	483	831	966
Total (benefit) cost	(126)	259	(251)	518
Other Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	3	4	6	8
Interest cost	86	94	172	188
Expected return on plan assets	0	0	0	0
Net amortization	20	29	40	58
Total (benefit) cost	$ 109	$ 127	$ 218	$ 254

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,579,000	43,099,000	43,546,000	43,220,000
Net income available to common stockholders	$ 21,359	$ 19,909	$ 41,638	$ 38,800
Basic EPS (in dollars per share)	$ 0.49	$ 0.46	$ 0.96	$ 0.90
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,579,000	43,009,000	43,546,000	43,220,000
Dilutive effect of common stock options and restricted stock (in shares)	322,000	354,000	340,000	364,000
Weighted average common shares and common share equivalents (in shares)	43,901,000	43,363,000	43,886,000	43,584,000
Net income available to common stockholders	$ 21,359	$ 19,909	$ 41,638	$ 38,800
Diluted EPS (in dollars per share)	$ 0.49	$ 0.46	$ 0.95	$ 0.89
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from calculation of diluted EPS (in shares)	3,250	33,179	1,144	25,139

Reclassification Adjustments 45

Reclassification Adjustments Out of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gain	$ (2)	$ (1)	$ (2)	$ (30)
Interest income	69,621	65,777	138,112	130,354
Other noninterest income	3,186	4,626	6,124	8,075
Salaries and employee benefits	32,754	32,931	66,341	65,372
Income tax (expense)	(10,678)	(10,257)	(18,979)	(19,988)
Net income	21,359	19,909	41,638	38,800
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification during the period, net of tax	407	484	2,135	959
AOCI Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income			0	0
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense)	(85)	(108)	(176)	(213)
Net income	138	171	1,597	333
Gains on Available for Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gain	(2)	(1)	(2)	(30)
Amortization of Unrealized Gains and Losses Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	225	280	463	576
Impairment Write-Down of Equity Security [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other noninterest income			1,312	0
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense)	(166)	(199)	(332)	(398)
Net income	269	313	538	626
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	435	515	870	1,030
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ 0	$ (3)	$ 0	$ (6)

Fair Value Measurements and F46

Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0	$ 0	$ 0	$ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	$ 0	0	$ 0
AFS securities [Abstract]
AFS Securities	1,365,521		1,365,521		$ 1,338,290
Trading securities	10,406		10,406		9,259
Liabilities [Abstract]
Collateral dependent impaired financing receivable with specific reserves	800		800		7,000
Allowance for loan losses for collateral dependent impaired loans with specific reserves	500		$ 500		1,500
Minimum [Member]
Liabilities [Abstract]
Liquidation expense ratio on impaired collateral			10.00%
Maximum [Member]
Liabilities [Abstract]
Liquidation expense ratio on impaired collateral			35.00%
Federal Agency [Member]
AFS securities [Abstract]
AFS Securities	159,520		$ 159,520		174,408
State & Municipal [Member]
AFS securities [Abstract]
AFS Securities	44,020		44,020		46,726
Other Securities [Member]
AFS securities [Abstract]
AFS Securities	19,012		19,012		20,739
Recurring Basis [Member]
AFS securities [Abstract]
AFS Securities	1,365,521		1,365,521		1,338,290
Trading securities	10,406		10,406		9,259
Derivatives	5,631		5,631		3,210
Total	1,381,558		1,381,558		1,350,759
Liabilities [Abstract]
Derivatives	2,960		2,960		506
Total	2,960		2,960		506
Recurring Basis [Member] | Level 1 [Member]
AFS securities [Abstract]
AFS Securities	10,744		10,744		11,493
Trading securities	10,406		10,406		9,259
Derivatives	0		0		0
Total	21,150		21,150		20,752
Liabilities [Abstract]
Derivatives	0		0		0
Total	0		0		0
Recurring Basis [Member] | Level 2 [Member]
AFS securities [Abstract]
AFS Securities	1,354,777		1,354,777		1,326,797
Trading securities	0		0		0
Derivatives	5,631		5,631		3,210
Total	1,360,408		1,360,408		1,330,007
Liabilities [Abstract]
Derivatives	2,960		2,960		506
Total	2,960		2,960		506
Recurring Basis [Member] | Level 3 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Trading securities	0		0		0
Derivatives	0		0		0
Total	0		0		0
Liabilities [Abstract]
Derivatives	0		0		0
Total	0		0		0
Recurring Basis [Member] | Federal Agency [Member]
AFS securities [Abstract]
AFS Securities	159,520		159,520		174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 1 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | Federal Agency [Member] | Level 2 [Member]
AFS securities [Abstract]
AFS Securities	159,520		159,520		174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 3 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | State & Municipal [Member]
AFS securities [Abstract]
AFS Securities	44,020		44,020		46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 1 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | State & Municipal [Member] | Level 2 [Member]
AFS securities [Abstract]
AFS Securities	44,020		44,020		46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 3 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | Mortgage-Backed [Member]
AFS securities [Abstract]
AFS Securities	564,061		564,061		529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 1 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 2 [Member]
AFS securities [Abstract]
AFS Securities	564,061		564,061		529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 3 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member]
AFS securities [Abstract]
AFS Securities	578,908		578,908		566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 1 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
AFS securities [Abstract]
AFS Securities	578,908		578,908		566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]
AFS securities [Abstract]
AFS Securities	0		0		0
Recurring Basis [Member] | Other Securities [Member]
AFS securities [Abstract]
AFS Securities	19,012		19,012		20,739
Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member]
AFS securities [Abstract]
AFS Securities	10,744		10,744		11,493
Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member]
AFS securities [Abstract]
AFS Securities	8,268		8,268		9,246
Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member]
AFS securities [Abstract]
AFS Securities	$ 0		$ 0		$ 0

Fair Value Measurements and F47

Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financial assets [Abstract]
HTM securities	$ 516,656	$ 525,050
Financial liabilities [Abstract]
Time deposits	832,449	872,411
Long-term debt	88,958	104,087
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Level 2 [Member]
Financial assets [Abstract]
HTM securities	515,628	527,948
Financial liabilities [Abstract]
Time deposits	832,449	872,411
Long-term debt	88,958	104,087
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	6,301,311	6,132,857
Estimated Fair Value [Member] | Level 2 [Member]
Financial assets [Abstract]
HTM securities	516,656	525,050
Financial liabilities [Abstract]
Time deposits	828,947	868,153
Long-term debt	89,064	104,113
Junior subordinated debt	103,499	102,262
Estimated Fair Value [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	6,453,713	6,273,233
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	410,500	371,100
Fair value of derivative asset	2,800	300
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	410,500	371,100
Fair value of derivative liability	2,800	300
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000	250,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	2,800	2,900
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	$ 100	$ 200

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Commitment to Extend Credits and Unused Lines of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 1,600	$ 1,500
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Obligation instrument term	5 years
Commitments - maximum potential obligation	$ 47.5	$ 36.8