NBT Bancorp (NBTB) 10-Q 10 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 30, 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		43,443,866
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 137,308	$ 147,789
Short-term interest bearing accounts	4,588	1,392
Securities available for sale, at fair value	1,367,574	1,338,290
Securities held to maturity (fair value $513,654 and $525,050, respectively)	515,793	527,948
Trading securities	10,044	9,259
Federal Reserve and Federal Home Loan Bank stock	42,577	47,033
Loans	6,272,303	6,198,057
Less allowance for loan losses	65,700	65,200
Net loans	6,206,603	6,132,857
Premises and equipment, net	83,144	84,187
Goodwill	265,439	265,439
Intangible assets, net	14,848	15,815
Bank owned life insurance	169,423	168,012
Other assets	128,144	129,247
Total assets	8,945,485	8,867,268
Liabilities
Demand (noninterest bearing)	2,205,419	2,195,845
Savings, negotiable order withdrawal and money market	4,153,552	3,905,432
Time	826,080	872,411
Total deposits	7,185,051	6,973,688
Short-term borrowings	540,243	681,703
Long-term debt	104,023	104,087
Junior subordinated debt	101,196	101,196
Other liabilities	88,133	93,278
Total liabilities	8,018,646	7,953,952
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at March 31, 2017 and December 31, 2016	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at March 31, 2017 and December 31, 2016; issued 49,651,493 at March 31, 2017 and December 31, 2016	497	497
Additional paid-in-capital	573,627	575,078
Retained earnings	511,925	501,761
Accumulated other comprehensive loss	(19,592)	(21,520)
Common stock in treasury, at cost, 6,209,092 and 6,393,743 shares at March 31, 2017 and December 31, 2016, respectively	(139,618)	(142,500)
Total stockholders' equity	926,839	913,316
Total liabilities and stockholders' equity	$ 8,945,485	$ 8,867,268

Consolidated Balance Sheets (u3

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Securities held to maturity fair value	$ 513,654	$ 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)	6,209,092	6,393,743

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest, fee, and dividend income
Interest and fees on loans	$ 64,027	$ 61,230
Securities available for sale	7,009	5,987
Securities held to maturity	2,781	2,288
Other	619	449
Total interest, fee, and dividend income	74,436	69,954
Interest expense
Deposits	3,474	3,597
Short-term borrowings	1,139	328
Long-term debt	606	833
Junior subordinated debt	726	619
Total interest expense	5,945	5,377
Net interest income	68,491	64,577
Provision for loan losses	7,379	6,098
Net interest income after provision for loan losses	61,112	58,479
Noninterest income
Insurance and other financial services revenue	6,770	6,946
Service charges on deposit accounts	3,977	3,939
ATM and debit card fees	4,950	4,583
Retirement plan administration fees	4,172	3,754
Trust	4,532	4,376
Bank owned life insurance	1,411	1,291
Net securities gains	0	29
Other	2,938	3,449
Total noninterest income	28,750	28,367
Noninterest expense
Salaries and employee benefits	33,587	32,441
Occupancy	6,170	5,491
Data processing and communications	4,198	4,050
Professional fees and outside services	3,032	3,231
Equipment	3,698	3,460
Office supplies and postage	1,608	1,547
FDIC expenses	1,178	1,258
Advertising	390	504
Amortization of intangible assets	967	1,096
Loan collection and other real estate owned	1,279	705
Other	5,175	4,441
Total noninterest expense	61,282	58,224
Income before income tax expense	28,580	28,622
Income tax expense	8,301	9,731
Net income	$ 20,279	$ 18,891
Earnings per share
Basic (in dollars per share)	$ 0.47	$ 0.44
Diluted (in dollars per share)	$ 0.46	$ 0.43

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 20,279	$ 18,891
Other comprehensive income, net of tax
Unrealized net holding gains arising during the period (pre-tax amounts of $836 and $13,211)	497	8,072
Reclassification adjustment for net gains (losses) related to securities available for sale included in net income (pre-tax amounts of $- and $29)	0	(19)
Reclassification adjustment for an impairment write-down of equity security (pre-tax amounts of $1,312 and $-)	811	0
Unrealized gains on derivatives (cash flow hedges) (pre-tax amounts of $331 and $-)	204	0
Amortization of unrealized net gains related to the reclassification of available for sale investment securities to held to maturity (pre-tax amounts of $238 and $296)	147	181
Pension and other benefits:
Amortization of prior service cost and actuarial loss (pre-tax amounts of $435 and $512)	269	313
Total other comprehensive income	1,928	8,547
Comprehensive income	$ 22,207	$ 27,438

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other comprehensive income (loss), net of tax:
Unrealized net holding (losses) gains arising during the period, pre-tax amounts	$ 836	$ 13,211
Reclassification adjustment for net gains (losses) related to securities available for sale included in net income, pre-tax amounts	0	29
Reclassification adjustment for an impairment write-down of equity security, pre-tax amounts	1,312	0
Unrealized gains on derivatives (cash flow hedged) (pre-tax amounts)	331	0
Amortization of unrealized net gains related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts	238	296
Amortization of prior service cost and actuarial loss, pre-tax amounts	$ 435	$ 512

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 Income (Loss) [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	18,891	0	0	18,891
Cash dividends	0	0	(9,473)	0	0	(9,473)
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	(4,584)	0	0	1,923	(2,661)
Stock-based compensation	0	1,612	0	0	0	1,612
Other comprehensive income	0	0	0	8,547	0	8,547
Balance at Mar. 31, 2016	497	573,754	471,650	(13,871)	(150,303)	881,727
Balance at Dec. 31, 2016	497	575,078	501,761	(21,520)	(142,500)	913,316
Net income	0	0	20,279	0	0	20,279
Cash dividends	0	0	(10,020)	0	0	(10,020)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(3,712)	0	0	2,882	(830)
Stock-based compensation	0	2,261	(95)	0	0	2,166
Other comprehensive income	0	0	0	1,928	0	1,928
Balance at Mar. 31, 2017	$ 497	$ 573,627	$ 511,925	$ (19,592)	$ (139,618)	$ 926,839

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.23	$ 0.22
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)	184,651	106,674

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 20,279	$ 18,891
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	7,379	6,098
Depreciation and amortization of premises and equipment	2,249	2,244
Net accretion on securities	1,267	799
Amortization of intangible assets	967	1,096
Excess tax benefit on stock-based compensation	1,472	0
Stock based compensation	2,166	1,612
Bank owned life insurance income	(1,411)	(1,291)
Trading securities purchases	(1,277)	(568)
Losses on trading securities	491	40
Proceeds from sales of loans held for sale	24,896	22,098
Originations and purchases of loans held for sale	(27,622)	(22,133)
Net gains on sales of loans held for sale	(46)	(49)
Net security (gains)	0	(29)
Net loss (gain) on sales of other real estate owned	157	(306)
Impairment write-down	1,312	0
Net decrease in other assets	595	2,135
Net (decrease) in other liabilities	(5,145)	(1,319)
Net cash provided by operating activities	27,729	29,318
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	78,038	74,090
Proceeds from sales	1,000	0
Purchases	(110,330)	(142,613)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	19,914	15,591
Purchases	(5,943)	(9,471)
Other:
Net increase in loans	(82,299)	(90,342)
Proceeds from Federal Home Loan Bank stock redemption	56,521	33,886
Purchases of Federal Reserve and Federal Home Loan Bank stock	(52,065)	(29,475)
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	(1,269)	(1,625)
Proceeds from the sales of other real estate owned	2,430	3,208
Net cash used in investing activities	(94,003)	(190,294)
Financing activities
Net increase in deposits	211,363	300,199
Net decrease in short-term borrowings	(141,460)	(94,613)
Repayments of long-term debt	(64)	(70)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	1,983	(7)
Cash paid by employer for tax-withholding on stock issuance	(2,813)	(2,654)
Purchase of treasury stock	0	(17,193)
Cash dividends	(10,020)	(9,473)
Net cash provided by financing activities	58,989	176,189
Net increase (decrease) in cash and cash equivalents	(7,285)	15,213
Cash and cash equivalents at beginning of period	149,181	140,297
Cash and cash equivalents at end of period	141,896	155,510
Cash paid during the period for:
Interest	6,363	5,876
Income taxes paid	1,019	3,405
Noncash investing activities:
Loans transferred to other real estate owned	$ 3,946	$ 952

Description of Business

Description of Business	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 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 (“GAAP”). These 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	3 Months Ended
	Mar. 31, 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 March 31, 2017 Federal agency $ 160,064 $ 80 $ 563 $ 159,581 State & municipal 47,910 161 227 47,844 Mortgage-backed: Government-sponsored enterprises 559,228 3,156 2,280 560,104 U.S. government agency securities 17,566 397 40 17,923 Collateralized mortgage obligations: Government-sponsored enterprises 511,651 562 6,910 505,303 U.S. government agency securities 58,239 180 741 57,678 Other securities 13,537 5,767 163 19,141 Total securities AFS $ 1,368,195 $ 10,303 $ 10,924 $ 1,367,574 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 Securities with amortized costs totaling $1.6 billion at March 31, 2017 and $1.5 billion at December 31, 2016 were pledged to secure public deposits and for other purposes required or permitted by law. At March 31, 2017 and December 31, 2016, securities with an amortized cost of $244.3 million and $235.6 million, respectively, were pledged as collateral for securities sold under repurchase agreements. The amortized cost, estimated fair value, and unrealized gains and losses of securities held to maturity (“HTM”) are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value March 31, 2017 Mortgage-backed: Government-sponsored enterprises $ 94,849 $ - $ 1,227 $ 93,622 U.S. government agency securities 491 76 - 567 Collateralized mortgage obligations: Government-sponsored enterprises 215,639 959 1,637 214,961 State & municipal 204,814 972 1,282 204,504 Total securities HTM $ 515,793 $ 2,007 $ 4,146 $ 513,654 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 The following table sets forth information with regard to investment securities with unrealized losses at March 31, 2017 and December 31, 2016, segregated according to the length of time the securities had been in a continuous unrealized loss position: 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 March 31, 2017 AFS Securities: Federal agency $ 94,535 $ (563 ) 9 $ - $ - - $ 94,535 $ (563 ) 9 State & municipal 24,235 (200 ) 37 1,528 (27 ) 2 25,763 (227 ) 39 Mortgage-backed 265,960 (2,307 ) 46 974 (13 ) 4 266,934 (2,320 ) 50 Collateralized mortgage obligations 442,362 (7,651 ) 57 - - - 442,362 (7,651 ) 57 Other securities 1,983 (17 ) 1 2,959 (146 ) 1 4,942 (163 ) 2 Total securities with unrealized losses $ 829,075 $ (10,738 ) 150 $ 5,461 $ (186 ) 7 $ 834,536 $ (10,924 ) 157 March 31, 2017 HTM securities: Mortgaged-backed $ 93,622 $ (1,227 ) 5 $ - $ - - $ 93,622 $ (1,227 ) 5 Collateralized mortgage obligations 103,287 (360 ) 12 33,841 (1,277 ) 4 137,128 (1,637 ) 16 State & municipal 48,303 (1,282 ) 75 - - - 48,303 (1,282 ) 75 Total securities with unrealized losses $ 245,212 $ (2,869 ) 92 $ 33,841 $ (1,277 ) 4 $ 279,053 $ (4,146 ) 96 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 December 31, 2016 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 (“ ”) investment’s Company 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 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. The fair value is expected to recover as the bonds approach their maturity date or repricing date or 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. The unrealized losses on equity securities are due to declines in the fair value below the cost basis of the securities. For AFS debt and equity securities, the Company considers a decline in fair value to be other-than-temporary if it is probable that the Company will not recover its cost basis. For 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 As of March 31, 2017 and December 31, 2016, management believes the impairments detailed in the table above are temporary . For the quarter ended March 31, 2017, $1.3 million of an OTTI loss on an equity investment was Company’s . There were no OTTI losses realized in the Company’s consolidated statements of income for the quarter ended December 31, 2016 The following tables set forth information with regard to contractual maturities of debt securities at March 31, 2017: (In thousands) Amortized cost Estimated fair value AFS debt securities: Within one year $ 43,247 $ 43,292 From one to five years 163,135 163,417 From five to ten years 162,510 163,494 After ten years 985,766 978,230 $ 1,354,658 $ 1,348,433 HTM debt securities: Within one year $ 38,266 $ 38,275 From one to five years 30,155 30,330 From five to ten years 126,026 126,080 After ten years 321,346 318,969 $ 515,793 $ 513,654 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 March 31, 2017 and December 31, 2016.

Allowance for Loan Losses and C

Allowance for Loan Losses and Credit Quality of Loans	3 Months Ended
	Mar. 31, 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 appropriately for risk of probable incurred 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 LOANS 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 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 collectibility 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 collectibility. 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 which 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 for the three months ended March 31, 2017 and 2016: (In thousands) 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 (1,294 ) (6,502 ) (598 ) - (8,394 ) Recoveries 447 1,035 33 - 1,515 Provision 130 6,861 388 - 7,379 Ending Balance as of March 31, 2017 $ 24,727 $ 34,769 $ 6,204 $ - $ 65,700 Balance as of December 31, 2015 $ 25,545 $ 29,253 $ 7,960 $ 260 $ 63,018 Charge-offs (437 ) (5,413 ) (709 ) - (6,559 ) Recoveries 765 974 22 - 1,761 Provision (574 ) 6,221 711 (260 ) 6,098 Ending Balance as of March 31, 2016 $ 25,299 $ 31,035 $ 7,984 $ - $ 64,318 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 The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments as of March 31, 2017 and December 31, 2016: (In thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Total As of March 31, 2017 Allowance for loan losses $ 24,727 $ 34,769 $ 6,204 $ 65,700 Allowance for loans individually evaluated for impairment 422 - - 422 Allowance for loans collectively evaluated for impairment $ 24,305 $ 34,769 $ 6,204 $ 65,278 Ending balance of loans $ 2,824,936 $ 2,171,593 $ 1,275,774 $ 6,272,303 Ending balance of originated loans individually evaluated for impairment 10,736 8,379 6,194 25,309 Ending balance of acquired loans individually evaluated for impairment - - - - Ending balance of acquired loans collectively evaluated for impairment 228,021 56,852 193,253 478,126 Ending balance of originated loans collectively evaluated for impairment $ 2,586,179 $ 2,106,362 $ 1,076,327 $ 5,768,868 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. Interest accrued in a prior period and not collected is charged-off against the allowance for loan losses. If ultimate repayment of a nonaccrual loan is expected, any payments received are applied in accordance with contractual terms. If ultimate repayment of principal is not expected, any payment received on a nonaccrual loan is applied to principal until ultimate repayment becomes expected. 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 March 31, 2017 and December 31, 2016: As of March 31, 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 $ 292 $ - $ - $ 292 $ 4,913 $ 702,383 $ 707,588 Commercial Real Estate 286 - - 286 2,516 1,346,470 1,349,272 Agricultural - - - - 685 36,052 36,737 Agricultural Real Estate - - - - 1,771 30,314 32,085 Business Banking 2,965 428 - 3,393 4,766 463,074 471,233 Total Commercial Loans 3,543 428 - 3,971 14,651 2,578,293 2,596,915 Consumer Loans: Indirect 15,407 3,552 2,222 21,181 2,135 1,575,393 1,598,709 Home Equity 2,635 614 58 3,307 2,926 447,902 454,135 Direct 246 71 103 420 63 61,414 61,897 Total Consumer Loans 18,288 4,237 2,383 24,908 5,124 2,084,709 2,114,741 Residential Real Estate Mortgages 2,444 322 - 2,766 8,585 1,071,170 1,082,521 Total Originated Loans $ 24,275 $ 4,987 $ 2,383 $ 31,645 $ 28,360 $ 5,734,172 $ 5,794,177 ACQUIRED Commercial Loans: Commercial $ - $ - $ - $ - $ - $ 45,908 $ 45,908 Commercial Real Estate - - - - 889 132,611 133,500 Business Banking 441 - - 441 800 47,372 48,613 Total Commercial Loans 441 - - 441 1,689 225,891 228,021 Consumer Loans: Indirect 37 1 9 47 39 5,713 5,799 Home Equity 177 - - 177 196 47,716 48,089 Direct 24 1 - 25 13 2,926 2,964 Total Consumer Loans 238 2 9 249 248 56,355 56,852 Residential Real Estate Mortgages 1,300 15 - 1,315 2,377 189,561 193,253 Total Acquired Loans $ 1,979 $ 17 $ 9 $ 2,005 $ 4,314 $ 471,807 $ 478,126 Total Loans $ 26,254 $ 5,004 $ 2,392 $ 33,650 $ 32,674 $ 6,205,979 $ 6,272,303 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 March 31, 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 of $0.8 million or more 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 measurement of impairment. Any change to the previously recognized impairment loss is recognized as a change to the allowance account and recorded in the consolidated statement of income as a component of the provision for loan losses. The following table provides information on loans specifically evaluated for impairment as of March 31, 2017 and December 31, 2016: March 31, 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 $ 3,495 $ 3,536 $ 1,278 $ 1,697 Commercial Real Estate 3,778 3,810 3,816 3,841 Agricultural 130 138 130 137 Agricultural Real Estate 1,520 1,660 1,434 1,567 Business Banking 645 724 655 728 Total Commercial Loans 9,568 9,868 7,313 7,970 Consumer Loans: Indirect 5 15 5 16 Home Equity 8,374 9,272 8,483 9,429 Total Consumer Loans 8,379 9,287 8,488 9,445 Residential Real Estate Mortgages 6,194 7,028 6,111 6,906 Total 24,141 26,183 21,912 24,321 With an allowance recorded: Commercial Loans: Commercial Real Estate 1,081 1,081 $ 335 5,553 5,736 $ 735 Agricultural 37 37 37 49 49 37 Agricultural Real Estate 50 50 50 155 155 54 Total Commercial Loans 1,168 1,168 422 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: $ 25,309 $ 27,351 $ 422 $ 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 March 31, 2017 and 2016: For the three months ended March 31, 2017 March 31, 2016 (In thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans: Commercial $ 2,926 $ - $ 2,773 $ 19 Commercial Real Estate 5,995 44 13,509 100 Agricultural 173 - 158 - Agricultural Real Estate 1,580 11 616 11 Business Banking 650 2 978 6 Consumer Loans: Indirect 5 - 11 - Home Equity 8,431 110 8,003 121 Residential Real Estate Mortgages 5,611 39 6,121 67 Total Originated 25,371 206 32,169 324 ACQUIRED Commercial Loans: Commercial Real Estate 301 - 1,205 - Total Acquired 301 - 1,205 - Total Loans $ 25,672 $ 206 $ 33,374 $ 324 Credit Quality Indicators The Company has developed an internal loan grading system to evaluate and quantify the Bank’s loan portfolio with respect to quality and risk. The system focuses on, among other things, financial strength of borrowers, experience and depth of 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. Commercial loans are graded as 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. Because of high probability of loss, nonaccrual treatment is required for Doubtful assets. ● 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 (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 March 31, 2017 and December 31, 2016: Credit Quality Indicators As of March 31, 2017 (In thousands) ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 658,916 $ 1,286,478 $ 34,144 $ 27,349 $ 2,006,887 Special Mention 12,987 31,208 310 2,558 47,063 Substandard 35,685 31,586 2,278 2,178 71,727 Doubtful - - 5 - 5 Total $ 707,588 $ 1,349,272 $ 36,737 $ 32,085 $ 2,125,682 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 457,783 $ 457,783 Classified 13,450 13,450 Total $ 471,233 $ 471,233 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,594,352 $ 451,151 $ 61,731 $ 2,107,234 Nonperforming 4,357 2,984 166 7,507 Total $ 1,598,709 $ 454,135 $ 61,897 $ 2,114,741 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 1,073,936 $ 1,073,936 Nonperforming 8,585 8,585 Total $ 1,082,521 $ 1,082,521 Credit Quality Indicators As of March 31, 2017 (In thousands) ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 44,782 $ 123,532 $ 168,314 Special Mention 55 2,883 2,938 Substandard 1,071 7,085 8,156 Total $ 45,908 $ 133,500 $ 179,408 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 44,889 $ 44,889 Classified 3,724 3,724 Total $ 48,613 $ 48,613 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 5,751 $ 47,893 $ 2,951 $ 56,595 Nonperforming 48 196 13 257 Total $ 5,799 $ 48,089 $ 2,964 $ 56,852 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 190,876 $ 190,876 Nonperforming 2,377 2,377 Total $ 193,253 $ 193,253 Credit Quality Indicators 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 Credit Quality Indicators 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 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. Residential and home equity TDRs occurring during 2017 and 2016 were due to the reduction in the interest rate or extension of the term. 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 for the three months ended March 31, 2017 and 2016 (dollars in thousands): Three months ended March 31, 2017 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 2 $ 78 $ 77 Total Consumer 2 78 77 Residential Real Estate 1 141 138 Total Troubled Debt Restructurings 3 $ 219 $ 215 Three months ended March 31, 2016 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 12 $ 1,035 $ 952 Total Consumer 12 1,035 952 Residential Real Estate 4 531 437 Total Troubled Debt Restructurings 16 $ 1,566 $ 1,389 Residential and home equity TDRs occurring during 2017 and 2016 were due to the reduction in the interest rate or extension Three months ended March 31, 2017 Three months ended March 31, 2016 Number of contracts Recorded Investment Number of contracts Recorded Investment Residential Real Estate - $ - 1 $ 175 Total Troubled Debt Restructurings - $ - 1 $ 175

Defined Benefit Postretirement

Defined Benefit Postretirement Plans	3 Months Ended
	Mar. 31, 2017
Defined Benefit Postretirement Plans [Abstract]
Defined Benefit Postretirement Plans	5. Defined Benefit Postretirement Plans The Company has a qualified, noncontributory, defined benefit pension plan (“the Plan”) covering substantially all of its employees at March 31, 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 bonds and 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 months ended March 31, 2017. In addition to the Plan, the Company also provides supplemental employee retirement plans to certain current and former executives. The Company also assumed supplemental retirement plans for certain current and former executives in the Alliance acquisition. These supplemental employee retirement plans and the Plan are collectively referred to herein as “Pension Benefits.” Also, 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 postretirement 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 postretirement 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 March 31, Three months ended March 31, Components of net periodic cost (benefit): 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 cost (benefit) $ (126 ) $ 259 $ 109 $ 127

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 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 stockholders 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 ). The following is a reconciliation of basic and diluted EPS for the periods presented in the consolidated statements of income: Three months ended March 31, (In thousands, except per share data) 2017 2016 Basic EPS: Weighted average common shares outstanding 43,513 43,342 Net income available to common stockholders $ 20,279 $ 18,891 Basic EPS $ 0.47 $ 0.44 Diluted EPS: Weighted average common shares outstanding 43,883 43,342 Dilutive effect of common stock options and restricted stock 371 365 Weighted average common shares and common share equivalents 44,254 43,707 Net income available to common stockholders $ 20,279 $ 18,891 Diluted EPS $ 0.46 $ 0.43 There were 783 and 30,861 stock options for the quarters ended March 31, 2017 and March 31, 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 (Loss)	3 Months Ended
	Mar. 31, 2017
Reclassification Adjustments Out of Other Comprehensive Income (Loss) [Abstract]
Reclassification Adjustments Out of Other Comprehensive Income (Loss)	7. Reclassification Adjustments Out of Other Comprehensive Income (Loss) The following table summarizes the reclassification adjustments out of accumulated other comprehensive loss (in thousands): Detail About Accumulated Other Comprehensive (Loss) Income Components Amount reclassified from accumulated other comprehensive income (loss) Affected line item in the consolidated statement of comprehensive income Three months ended March 31, 2017 March 31, 2016 Available for sale securities: (Gains) on available for sale securities $ - $ (29 ) Net securities (gains) losses Amortization of unrealized gains and losses related to securities transfer 238 296 Interest income Impairment write-down of equity security 1,312 - Other noninterest income Income tax (expense) (592 ) (105 ) Income tax (expense) Net of tax $ 958 $ 162 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 $ 1,227 $ 475

Fair Value Measurements and Fai

Fair Value Measurements and Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 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 U.S. 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 (e.g., 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 price 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. The prices for these 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, among 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 month periods ended March 31, 2017 and December 31, 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 as of March 31, 2017 and December 31, 2016. Assets and liabilities are classified in their entirety based on the lowest level of input Level 1 Level 2 Level 3 Balance as of Assets: AFS securities: Federal agency $ - $ 159,581 $ - $ 159,581 State & municipal - 47,844 - 47,844 Mortgage-backed - 578,027 - 578,027 Collateralized mortgage obligations - 562,981 - 562,981 Other securities 10,923 8,218 - 19,141 Total AFS securities $ 10,923 $ 1,356,651 $ - $ 1,367,574 Trading Securities 10,044 - - 10,044 Interest Rate Swaps - 3,971 - 3,971 Total $ 20,967 $ 1,360,622 $ - $ 1,381,589 Liabilities: Interest Rate Swaps $ - $ 736 $ - $ 736 Total $ - $ 736 $ - $ 736 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 Interest Rate Swaps - 3,210 - 3,210 Total $ 20,752 $ 1,330,007 $ - $ 1,350,759 Liabilities: Interest Rate Swaps $ - $ 506 $ - $ 506 Total $ - $ 506 $ - $ 506 GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a nonrecurring basis such as goodwill, loans held for sale, other real estate owned, collateral-dependent impaired loans, mortgage servicing rights, and held-to-maturity securities. The only nonrecurring fair value measurements recorded during the three month period ended March 31, 2017 were related to impaired loans. For the three months periods ending March 31, 2017 and March 31, 2016 the Company had $1.2 million and $9.0 million, respectively, of loans recorded at fair value with specific allowance reserves of $0.4 million and $3.0 million, respectively The following table sets forth information with regard to estimated fair values of financial instruments at March 31, 2017 and December 31, 2016. 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 available for sale, trading securities, accrued interest receivable, non-maturity deposits, short-term borrowings, accrued interest payable, and interest rate swaps. March 31, 2017 December 31, 2016 (In thousands) Fair Value Hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value Financial assets Securities held to maturity 2 $ 515,793 $ 513,654 $ 527,948 $ 525,050 Net loans 3 6,206,603 6,354,631 6,132,857 6,273,233 Financial liabilities Time deposits 2 $ 826,080 $ 821,557 $ 872,411 $ 868,153 Long-term debt 2 104,023 103,976 104,087 104,113 Junior subordinated debt 2 101,196 101,922 101,196 102,262 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 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 consolidated statement of income. At March 31, 2017 the notional amount of these customer derivative agreement and the offsetting derivative counterparty positions each totaled $394.9 million and the fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $0.7 million. At December 31, 2016, the notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $371.1 million. At December 31, 2016, fair values included in other assets and other liabilities on the 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 FHLB 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 March 31, 2017 and December 31, 2016. Fair values included in other assets on the consolidated balance sheet applicable to these agreements amounted to $3.2 million at March 31, 2017 and $2.7 million at December 31, 2016.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 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 $1.5 billion at March 31, 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 $48.9 million at March 31, 2017 and $36.8 million at December 31, 2016. As of March 31, 2017, the fair value of standby letters of credit was not significant to the Company’s consolidated financial statements.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 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 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 March 2017, the FASB issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic310-20) 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)	3 Months Ended
	Mar. 31, 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)	3 Months Ended
	Mar. 31, 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 (“ ”) investment’s Company 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 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. The fair value is expected to recover as the bonds approach their maturity date or repricing date or 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. The unrealized losses on equity securities are due to declines in the fair value below the cost basis of the securities. For AFS debt and equity securities, the Company considers a decline in fair value to be other-than-temporary if it is probable that the Company will not recover its cost basis. For 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 As of March 31, 2017 and December 31, 2016, management believes the impairments detailed in the table above are temporary . For the quarter ended March 31, 2017, $1.3 million of an OTTI loss on an equity investment was Company’s . There were no OTTI losses realized in the Company’s consolidated statements of income for the quarter ended December 31, 2016

Allowance for Loan Losses and22

Allowance for Loan Losses and Credit Quality of Loans (Policies)	3 Months Ended
	Mar. 31, 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 appropriately for risk of probable incurred 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 LOANS 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 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 collectibility 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 collectibility. 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 which 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.
Troubled Debt Restructuring	Troubled Debt Restructured Loans Substantially all 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. Residential and home equity TDRs occurring during 2017 and 2016 were due to the reduction in the interest rate or extension of the term. 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 Postretiremen23

Defined Benefit Postretirement Plans (Policies)	3 Months Ended
	Mar. 31, 2017
Defined Benefit Postretirement 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 March 31, 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 bonds and 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 months ended March 31, 2017. In addition to the Plan, the Company also provides supplemental employee retirement plans to certain current and former executives. The Company also assumed supplemental retirement plans for certain current and former executives in the Alliance acquisition. These supplemental employee retirement plans and the Plan are collectively referred to herein as “Pension Benefits.” Also, 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 postretirement 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 postretirement benefits are referred to herein as “Other Benefits.”

Fair Value Measurements and F24

Fair Value Measurements and Fair Value of Financial Instruments (Policies)	3 Months Ended
	Mar. 31, 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 U.S. 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 (e.g., 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 price 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. The prices for these 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, among 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 month periods ended March 31, 2017 and December 31, 2016, the Company has made no transfers of assets between Level 1 and Level 2, and has had no Level 3 activity. GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a nonrecurring basis such as goodwill, loans held for sale, other real estate owned, collateral-dependent impaired loans, mortgage servicing rights, and held-to-maturity securities. The only nonrecurring fair value measurements recorded during the three month period ended March 31, 2017 were related to impaired loans. For the three months periods ending March 31, 2017 and March 31, 2016 the Company had $1.2 million and $9.0 million, respectively, of loans recorded at fair value with specific allowance reserves of $0.4 million and $3.0 million, respectively 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 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 consolidated statement of income. At March 31, 2017 the notional amount of these customer derivative agreement and the offsetting derivative counterparty positions each totaled $394.9 million and the fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $0.7 million. At December 31, 2016, the notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $371.1 million. At December 31, 2016, fair values included in other assets and other liabilities on the 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 FHLB 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 March 31, 2017 and December 31, 2016. Fair values included in other assets on the consolidated balance sheet applicable to these agreements amounted to $3.2 million at March 31, 2017 and $2.7 million at December 31, 2016.

Recent Accounting Pronounceme25

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2017
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Recently Adopted Accounting Standards Effective January 1, 2017, the Company adopted the prevision of 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 March 2017, the FASB issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic310-20) 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)	3 Months Ended
	Mar. 31, 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 March 31, 2017 Federal agency $ 160,064 $ 80 $ 563 $ 159,581 State & municipal 47,910 161 227 47,844 Mortgage-backed: Government-sponsored enterprises 559,228 3,156 2,280 560,104 U.S. government agency securities 17,566 397 40 17,923 Collateralized mortgage obligations: Government-sponsored enterprises 511,651 562 6,910 505,303 U.S. government agency securities 58,239 180 741 57,678 Other securities 13,537 5,767 163 19,141 Total securities AFS $ 1,368,195 $ 10,303 $ 10,924 $ 1,367,574 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 securities held to maturity (“HTM”) are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value March 31, 2017 Mortgage-backed: Government-sponsored enterprises $ 94,849 $ - $ 1,227 $ 93,622 U.S. government agency securities 491 76 - 567 Collateralized mortgage obligations: Government-sponsored enterprises 215,639 959 1,637 214,961 State & municipal 204,814 972 1,282 204,504 Total securities HTM $ 515,793 $ 2,007 $ 4,146 $ 513,654 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 at March 31, 2017 and December 31, 2016, segregated according to the length of time the securities had been in a continuous unrealized loss position: 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 March 31, 2017 AFS Securities: Federal agency $ 94,535 $ (563 ) 9 $ - $ - - $ 94,535 $ (563 ) 9 State & municipal 24,235 (200 ) 37 1,528 (27 ) 2 25,763 (227 ) 39 Mortgage-backed 265,960 (2,307 ) 46 974 (13 ) 4 266,934 (2,320 ) 50 Collateralized mortgage obligations 442,362 (7,651 ) 57 - - - 442,362 (7,651 ) 57 Other securities 1,983 (17 ) 1 2,959 (146 ) 1 4,942 (163 ) 2 Total securities with unrealized losses $ 829,075 $ (10,738 ) 150 $ 5,461 $ (186 ) 7 $ 834,536 $ (10,924 ) 157 March 31, 2017 HTM securities: Mortgaged-backed $ 93,622 $ (1,227 ) 5 $ - $ - - $ 93,622 $ (1,227 ) 5 Collateralized mortgage obligations 103,287 (360 ) 12 33,841 (1,277 ) 4 137,128 (1,637 ) 16 State & municipal 48,303 (1,282 ) 75 - - - 48,303 (1,282 ) 75 Total securities with unrealized losses $ 245,212 $ (2,869 ) 92 $ 33,841 $ (1,277 ) 4 $ 279,053 $ (4,146 ) 96 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 December 31, 2016 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 March 31, 2017: (In thousands) Amortized cost Estimated fair value AFS debt securities: Within one year $ 43,247 $ 43,292 From one to five years 163,135 163,417 From five to ten years 162,510 163,494 After ten years 985,766 978,230 $ 1,354,658 $ 1,348,433 HTM debt securities: Within one year $ 38,266 $ 38,275 From one to five years 30,155 30,330 From five to ten years 126,026 126,080 After ten years 321,346 318,969 $ 515,793 $ 513,654

Allowance for Loan Losses and27

Allowance for Loan Losses and Credit Quality of Loans (Tables)	3 Months Ended
	Mar. 31, 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 for the three months ended March 31, 2017 and 2016: (In thousands) 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 (1,294 ) (6,502 ) (598 ) - (8,394 ) Recoveries 447 1,035 33 - 1,515 Provision 130 6,861 388 - 7,379 Ending Balance as of March 31, 2017 $ 24,727 $ 34,769 $ 6,204 $ - $ 65,700 Balance as of December 31, 2015 $ 25,545 $ 29,253 $ 7,960 $ 260 $ 63,018 Charge-offs (437 ) (5,413 ) (709 ) - (6,559 ) Recoveries 765 974 22 - 1,761 Provision (574 ) 6,221 711 (260 ) 6,098 Ending Balance as of March 31, 2016 $ 25,299 $ 31,035 $ 7,984 $ - $ 64,318 The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments as of March 31, 2017 and December 31, 2016: (In thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Total As of March 31, 2017 Allowance for loan losses $ 24,727 $ 34,769 $ 6,204 $ 65,700 Allowance for loans individually evaluated for impairment 422 - - 422 Allowance for loans collectively evaluated for impairment $ 24,305 $ 34,769 $ 6,204 $ 65,278 Ending balance of loans $ 2,824,936 $ 2,171,593 $ 1,275,774 $ 6,272,303 Ending balance of originated loans individually evaluated for impairment 10,736 8,379 6,194 25,309 Ending balance of acquired loans individually evaluated for impairment - - - - Ending balance of acquired loans collectively evaluated for impairment 228,021 56,852 193,253 478,126 Ending balance of originated loans collectively evaluated for impairment $ 2,586,179 $ 2,106,362 $ 1,076,327 $ 5,768,868 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 March 31, 2017 and December 31, 2016: As of March 31, 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 $ 292 $ - $ - $ 292 $ 4,913 $ 702,383 $ 707,588 Commercial Real Estate 286 - - 286 2,516 1,346,470 1,349,272 Agricultural - - - - 685 36,052 36,737 Agricultural Real Estate - - - - 1,771 30,314 32,085 Business Banking 2,965 428 - 3,393 4,766 463,074 471,233 Total Commercial Loans 3,543 428 - 3,971 14,651 2,578,293 2,596,915 Consumer Loans: Indirect 15,407 3,552 2,222 21,181 2,135 1,575,393 1,598,709 Home Equity 2,635 614 58 3,307 2,926 447,902 454,135 Direct 246 71 103 420 63 61,414 61,897 Total Consumer Loans 18,288 4,237 2,383 24,908 5,124 2,084,709 2,114,741 Residential Real Estate Mortgages 2,444 322 - 2,766 8,585 1,071,170 1,082,521 Total Originated Loans $ 24,275 $ 4,987 $ 2,383 $ 31,645 $ 28,360 $ 5,734,172 $ 5,794,177 ACQUIRED Commercial Loans: Commercial $ - $ - $ - $ - $ - $ 45,908 $ 45,908 Commercial Real Estate - - - - 889 132,611 133,500 Business Banking 441 - - 441 800 47,372 48,613 Total Commercial Loans 441 - - 441 1,689 225,891 228,021 Consumer Loans: Indirect 37 1 9 47 39 5,713 5,799 Home Equity 177 - - 177 196 47,716 48,089 Direct 24 1 - 25 13 2,926 2,964 Total Consumer Loans 238 2 9 249 248 56,355 56,852 Residential Real Estate Mortgages 1,300 15 - 1,315 2,377 189,561 193,253 Total Acquired Loans $ 1,979 $ 17 $ 9 $ 2,005 $ 4,314 $ 471,807 $ 478,126 Total Loans $ 26,254 $ 5,004 $ 2,392 $ 33,650 $ 32,674 $ 6,205,979 $ 6,272,303 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 as of March 31, 2017 and December 31, 2016: March 31, 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 $ 3,495 $ 3,536 $ 1,278 $ 1,697 Commercial Real Estate 3,778 3,810 3,816 3,841 Agricultural 130 138 130 137 Agricultural Real Estate 1,520 1,660 1,434 1,567 Business Banking 645 724 655 728 Total Commercial Loans 9,568 9,868 7,313 7,970 Consumer Loans: Indirect 5 15 5 16 Home Equity 8,374 9,272 8,483 9,429 Total Consumer Loans 8,379 9,287 8,488 9,445 Residential Real Estate Mortgages 6,194 7,028 6,111 6,906 Total 24,141 26,183 21,912 24,321 With an allowance recorded: Commercial Loans: Commercial Real Estate 1,081 1,081 $ 335 5,553 5,736 $ 735 Agricultural 37 37 37 49 49 37 Agricultural Real Estate 50 50 50 155 155 54 Total Commercial Loans 1,168 1,168 422 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: $ 25,309 $ 27,351 $ 422 $ 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 March 31, 2017 and 2016: For the three months ended March 31, 2017 March 31, 2016 (In thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans: Commercial $ 2,926 $ - $ 2,773 $ 19 Commercial Real Estate 5,995 44 13,509 100 Agricultural 173 - 158 - Agricultural Real Estate 1,580 11 616 11 Business Banking 650 2 978 6 Consumer Loans: Indirect 5 - 11 - Home Equity 8,431 110 8,003 121 Residential Real Estate Mortgages 5,611 39 6,121 67 Total Originated 25,371 206 32,169 324 ACQUIRED Commercial Loans: Commercial Real Estate 301 - 1,205 - Total Acquired 301 - 1,205 - Total Loans $ 25,672 $ 206 $ 33,374 $ 324
Financing Receivable Credit Quality by Loan Class	The following tables illustrate the Company’s credit quality by loan class as of March 31, 2017 and December 31, 2016: Credit Quality Indicators As of March 31, 2017 (In thousands) ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 658,916 $ 1,286,478 $ 34,144 $ 27,349 $ 2,006,887 Special Mention 12,987 31,208 310 2,558 47,063 Substandard 35,685 31,586 2,278 2,178 71,727 Doubtful - - 5 - 5 Total $ 707,588 $ 1,349,272 $ 36,737 $ 32,085 $ 2,125,682 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 457,783 $ 457,783 Classified 13,450 13,450 Total $ 471,233 $ 471,233 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,594,352 $ 451,151 $ 61,731 $ 2,107,234 Nonperforming 4,357 2,984 166 7,507 Total $ 1,598,709 $ 454,135 $ 61,897 $ 2,114,741 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 1,073,936 $ 1,073,936 Nonperforming 8,585 8,585 Total $ 1,082,521 $ 1,082,521 Credit Quality Indicators As of March 31, 2017 (In thousands) ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 44,782 $ 123,532 $ 168,314 Special Mention 55 2,883 2,938 Substandard 1,071 7,085 8,156 Total $ 45,908 $ 133,500 $ 179,408 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 44,889 $ 44,889 Classified 3,724 3,724 Total $ 48,613 $ 48,613 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 5,751 $ 47,893 $ 2,951 $ 56,595 Nonperforming 48 196 13 257 Total $ 5,799 $ 48,089 $ 2,964 $ 56,852 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 190,876 $ 190,876 Nonperforming 2,377 2,377 Total $ 193,253 $ 193,253 Credit Quality Indicators 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 Credit Quality Indicators 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 for the three months ended March 31, 2017 and 2016 (dollars in thousands): Three months ended March 31, 2017 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 2 $ 78 $ 77 Total Consumer 2 78 77 Residential Real Estate 1 141 138 Total Troubled Debt Restructurings 3 $ 219 $ 215 Three months ended March 31, 2016 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 12 $ 1,035 $ 952 Total Consumer 12 1,035 952 Residential Real Estate 4 531 437 Total Troubled Debt Restructurings 16 $ 1,566 $ 1,389 Residential and home equity TDRs occurring during 2017 and 2016 were due to the reduction in the interest rate or extension Three months ended March 31, 2017 Three months ended March 31, 2016 Number of contracts Recorded Investment Number of contracts Recorded Investment Residential Real Estate - $ - 1 $ 175 Total Troubled Debt Restructurings - $ - 1 $ 175

Defined Benefit Postretiremen28

Defined Benefit Postretirement Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Defined Benefit Postretirement 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 March 31, Three months ended March 31, Components of net periodic cost (benefit): 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 cost (benefit) $ (126 ) $ 259 $ 109 $ 127

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 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 consolidated statements of income: Three months ended March 31, (In thousands, except per share data) 2017 2016 Basic EPS: Weighted average common shares outstanding 43,513 43,342 Net income available to common stockholders $ 20,279 $ 18,891 Basic EPS $ 0.47 $ 0.44 Diluted EPS: Weighted average common shares outstanding 43,883 43,342 Dilutive effect of common stock options and restricted stock 371 365 Weighted average common shares and common share equivalents 44,254 43,707 Net income available to common stockholders $ 20,279 $ 18,891 Diluted EPS $ 0.46 $ 0.43

Reclassification Adjustments 30

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2017
Reclassification Adjustments Out of Other Comprehensive Income (Loss) [Abstract]
Reclassification Out of Accumulated Other Comprehensive Income	The following table summarizes the reclassification adjustments out of accumulated other comprehensive loss (in thousands): Detail About Accumulated Other Comprehensive (Loss) Income Components Amount reclassified from accumulated other comprehensive income (loss) Affected line item in the consolidated statement of comprehensive income Three months ended March 31, 2017 March 31, 2016 Available for sale securities: (Gains) on available for sale securities $ - $ (29 ) Net securities (gains) losses Amortization of unrealized gains and losses related to securities transfer 238 296 Interest income Impairment write-down of equity security 1,312 - Other noninterest income Income tax (expense) (592 ) (105 ) Income tax (expense) Net of tax $ 958 $ 162 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 $ 1,227 $ 475

Fair Value Measurements and F31

Fair Value Measurements and Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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 as of March 31, 2017 and December 31, 2016. Assets and liabilities are classified in their entirety based on the lowest level of input Level 1 Level 2 Level 3 Balance as of Assets: AFS securities: Federal agency $ - $ 159,581 $ - $ 159,581 State & municipal - 47,844 - 47,844 Mortgage-backed - 578,027 - 578,027 Collateralized mortgage obligations - 562,981 - 562,981 Other securities 10,923 8,218 - 19,141 Total AFS securities $ 10,923 $ 1,356,651 $ - $ 1,367,574 Trading Securities 10,044 - - 10,044 Interest Rate Swaps - 3,971 - 3,971 Total $ 20,967 $ 1,360,622 $ - $ 1,381,589 Liabilities: Interest Rate Swaps $ - $ 736 $ - $ 736 Total $ - $ 736 $ - $ 736 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 Interest Rate Swaps - 3,210 - 3,210 Total $ 20,752 $ 1,330,007 $ - $ 1,350,759 Liabilities: Interest Rate Swaps $ - $ 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 at March 31, 2017 and December 31, 2016. 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 available for sale, trading securities, accrued interest receivable, non-maturity deposits, short-term borrowings, accrued interest payable, and interest rate swaps. March 31, 2017 December 31, 2016 (In thousands) Fair Value Hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value Financial assets Securities held to maturity 2 $ 515,793 $ 513,654 $ 527,948 $ 525,050 Net loans 3 6,206,603 6,354,631 6,132,857 6,273,233 Financial liabilities Time deposits 2 $ 826,080 $ 821,557 $ 872,411 $ 868,153 Long-term debt 2 104,023 103,976 104,087 104,113 Junior subordinated debt 2 101,196 101,922 101,196 102,262

Securities, Available for Sale

Securities, Available for Sale (Details) $ in Thousands	Mar. 31, 2017USD ($)Position	Dec. 31, 2016USD ($)Position
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,368,195	$ 1,341,059
Unrealized gains	10,303	11,097
Unrealized losses	10,924	13,866
Estimated fair value	1,367,574	1,338,290
Amortized costs of securities available for sale pledged to secure public deposits	1,600,000	1,500,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements	244,300	235,600
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	829,075	902,506
12 months or longer	5,461	5,831
Total	834,536	908,337
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(10,738)	(12,347)
12 months or longer	(186)	(1,519)
Total	$ (10,924)	$ (13,866)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	150	171
12 months or longer | Position	7	7
Total | Position	157	178
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Within one year	$ 43,247
From one to five years	163,135
From five to ten years	162,510
After ten years	985,766
Amortized cost	1,354,658
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Within one year	43,292
From one to five years	163,417
From five to ten years	163,494
After ten years	978,230
Fair value	1,348,433
Federal Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	160,064	$ 175,135
Unrealized gains	80	78
Unrealized losses	563	805
Estimated fair value	159,581	174,408
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	94,535	119,363
12 months or longer	0	0
Total	94,535	119,363
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(563)	(805)
12 months or longer	0	0
Total	$ (563)	$ (805)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	9	10
12 months or longer | Position	0	0
Total | Position	9	10
State & Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 47,910	$ 47,053
Unrealized gains	161	153
Unrealized losses	227	480
Estimated fair value	47,844	46,726
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	24,235	31,873
12 months or longer	1,528	483
Total	25,763	32,356
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(200)	(478)
12 months or longer	(27)	(2)
Total	$ (227)	$ (480)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	37	55
12 months or longer | Position	2	1
Total | Position	39	56
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 265,960	$ 277,524
12 months or longer	974	985
Total	266,934	278,509
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(2,307)	(2,668)
12 months or longer	(13)	(13)
Total	$ (2,320)	$ (2,681)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	46	49
12 months or longer | Position	4	4
Total | Position	50	53
Mortgage-backed Securities, Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 559,228	$ 513,814
Unrealized gains	3,156	3,345
Unrealized losses	2,280	2,492
Estimated fair value	560,104	514,667
Mortgage-backed Securities, U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	17,566	14,955
Unrealized gains	397	411
Unrealized losses	40	189
Estimated fair value	17,923	15,177
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	442,362	473,746
12 months or longer	0	0
Total	442,362	473,746
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(7,651)	(8,396)
12 months or longer	0	0
Total	$ (7,651)	$ (8,396)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	57	57
12 months or longer | Position	0	0
Total | Position	57	57
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 511,651	$ 513,431
Unrealized gains	562	532
Unrealized losses	6,910	7,688
Estimated fair value	505,303	506,275
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	58,239	60,822
Unrealized gains	180	184
Unrealized losses	741	708
Estimated fair value	57,678	60,298
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	13,537	15,849
Unrealized gains	5,767	6,394
Unrealized losses	163	1,504
Estimated fair value	19,141	20,739
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	1,983	0
12 months or longer	2,959	4,363
Total	4,942	4,363
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(17)	0
12 months or longer	(146)	(1,504)
Total	$ (163)	$ (1,504)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1	0
12 months or longer | Position	1	2
Total | Position	2	2

Securities, Held to Maturity (D

Securities, Held to Maturity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)Position	Dec. 31, 2016USD ($)Position
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 515,793	$ 527,948
Unrealized gains	2,007	1,581
Unrealized losses	4,146	4,479
Estimated fair value	513,654	525,050
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	245,212	286,063
12 months or longer	33,841	35,209
Total	279,053	321,272
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(2,869)	(3,290)
12 months or longer	(1,277)	(1,189)
Total	$ (4,146)	$ (4,479)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	92	172
12 months or longer | Position	4	4
Total | Position	96	176
OTTI loss realized on equity investment	$ 1,300	$ 0
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Within one year	38,266
From one to five years	30,155
From five to ten years	126,026
After ten years	321,346
Amortized cost	515,793	527,948
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Within one year	38,275
From one to five years	30,330
From five to ten years	126,080
After ten years	318,969
Fair value	513,654	525,050
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	93,622	95,492
12 months or longer	0	0
Total	93,622	95,492
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(1,227)	(1,176)
12 months or longer	0	0
Total	$ (1,227)	$ (1,176)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	5	5
12 months or longer | Position	0	0
Total | Position	5	5
Mortgage-backed Securities, Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 94,849	$ 96,668
Unrealized gains	0	0
Unrealized losses	1,227	1,176
Estimated fair value	93,622	95,492
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	94,849	96,668
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Fair value	93,622	95,492
Mortgage-backed Securities, U.S. Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	491	533
Unrealized gains	76	87
Unrealized losses	0	0
Estimated fair value	567	620
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	491	533
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Fair value	567	620
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	103,287	108,587
12 months or longer	33,841	35,209
Total	137,128	143,796
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(360)	(319)
12 months or longer	(1,277)	(1,189)
Total	$ (1,637)	$ (1,508)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	12	12
12 months or longer | Position	4	4
Total | Position	16	16
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 215,639	$ 225,213
Unrealized gains	959	1,060
Unrealized losses	1,637	1,508
Estimated fair value	214,961	224,765
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	215,639	225,213
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Fair value	214,961	224,765
State & Municipal [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	204,814	205,534
Unrealized gains	972	434
Unrealized losses	1,282	1,795
Estimated fair value	204,504	204,173
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	48,303	81,984
12 months or longer	0	0
Total	48,303	81,984
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(1,282)	(1,795)
12 months or longer	0	0
Total	$ (1,282)	$ (1,795)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	75	155
12 months or longer | Position	0	0
Total | Position	75	155
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	$ 204,814	$ 205,534
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Fair value	$ 204,504	$ 204,173

Allowance for Loan Losses and34

Allowance for Loan Losses and Credit Quality of Loans (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)Segment
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]
Financing Receivable, Allowance for Credit Losses [Line Items]
Business banking loans, amount available | $	$ 0.8
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 appraised value or purchase price of the 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 and35

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 65,200	$ 63,018	$ 63,018
Charge-offs	(8,394)	(6,559)
Recoveries	1,515	1,761
Provision	7,379	6,098
Balance, end of period	65,700	64,318	65,200
Allowance for loan losses for acquired loan portfolio	0		700
Provision expense and net charge-offs related to acquired loans	400		100
Commercial Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	25,444	25,545	25,545
Charge-offs	(1,294)	(437)
Recoveries	447	765
Provision	130	(574)
Balance, end of period	24,727	25,299	25,444
Consumer Loans [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	33,375	29,253	29,253
Charge-offs	(6,502)	(5,413)
Recoveries	1,035	974
Provision	6,861	6,221
Balance, end of period	34,769	31,035	33,375
Residential Real Estate Mortgages [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	6,381	7,960	7,960
Charge-offs	(598)	(709)
Recoveries	33	22
Provision	388	711
Balance, end of period	6,204	7,984	6,381
Unallocated [Member]
Changes in allowance for loan losses by portfolio segment [Roll Forward]
Balance, beginning of period	0	260	260
Charge-offs	0	0
Recoveries	0	0
Provision	0	(260)
Balance, end of period	$ 0	$ 0	$ 0

Allowance for Loan Losses and36

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	$ 65,700	$ 65,200	$ 64,318	$ 63,018
Allowance for loans individually evaluated for impairment	422	1,517
Allowance for loans collectively evaluated for impairment	65,278	63,683
Ending balance of loans	6,272,303	6,198,057
Commercial Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	24,727	25,444	25,299	25,545
Allowance for loans individually evaluated for impairment	422	1,517
Allowance for loans collectively evaluated for impairment	24,305	23,927
Ending balance of loans	2,824,936	2,786,002
Consumer Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	34,769	33,375	31,035	29,253
Allowance for loans individually evaluated for impairment	0	0
Allowance for loans collectively evaluated for impairment	34,769	33,375
Ending balance of loans	2,171,593	2,149,441
Residential Real Estate Mortgages [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	6,204	6,381	7,984	7,960
Allowance for loans individually evaluated for impairment	0	0
Allowance for loans collectively evaluated for impairment	6,204	6,381
Ending balance of loans	1,275,774	1,262,614
Unallocated [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Allowance for loan losses	0	0	$ 0	$ 260
Originated Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	5,794,177	5,697,963
Ending balance of loans individually evaluated for impairment	25,309	27,669
Ending balance of loans collectively evaluated for impairment	5,768,868	5,670,294
Originated Loans [Member] | Commercial Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	2,596,915	2,548,384
Ending balance of loans individually evaluated for impairment	10,736	13,070
Ending balance of loans collectively evaluated for impairment	2,586,179	2,535,314
Originated Loans [Member] | Consumer Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	2,114,741	2,086,436
Ending balance of loans individually evaluated for impairment	8,379	8,488
Ending balance of loans collectively evaluated for impairment	2,106,362	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	1,082,521	1,063,143
Ending balance of loans individually evaluated for impairment	6,194	6,111
Ending balance of loans collectively evaluated for impairment	1,076,327	1,057,032
Acquired Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	478,126	500,094
Ending balance of loans individually evaluated for impairment	0	1,205
Ending balance of loans collectively evaluated for impairment	478,126	498,889
Acquired Loans [Member] | Commercial Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	228,021	237,618
Ending balance of loans individually evaluated for impairment	0	1,205
Ending balance of loans collectively evaluated for impairment	228,021	236,413
Acquired Loans [Member] | Consumer Loans [Member]
Allowance for loan losses and recorded investment by portfolio segment [Abstract]
Ending balance of loans	56,852	63,005
Ending balance of loans individually evaluated for impairment	0	0
Ending balance of loans collectively evaluated for impairment	56,852	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	193,253	199,471
Ending balance of loans individually evaluated for impairment	0	0
Ending balance of loans collectively evaluated for impairment	$ 193,253	$ 199,471

Allowance for Loan Losses and37

Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 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	$ 33,650	$ 39,485
Non-Accrual	32,674	35,712
Current	6,205,979	6,122,860
Recorded Total Loans	6,272,303	6,198,057
31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	26,254	28,717
61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,004	5,958
Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,392	4,810
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	2,824,936	2,786,002
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	2,171,593	2,149,441
Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	1,275,774	1,262,614
Originated Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	31,645	37,811
Non-Accrual	28,360	30,077
Current	5,734,172	5,630,075
Recorded Total Loans	5,794,177	5,697,963
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	24,275	27,488
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,987	5,870
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,383	4,453
Originated Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,971	1,965
Non-Accrual	14,651	18,292
Current	2,578,293	2,528,127
Recorded Total Loans	2,596,915	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	3,543	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	428	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	292	38
Non-Accrual	4,913	2,964
Current	702,383	650,568
Recorded Total Loans	707,588	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	292	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	0	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	286	0
Non-Accrual	2,516	7,935
Current	1,346,470	1,343,854
Recorded Total Loans	1,349,272	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	286	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	0	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	685	730
Current	36,052	37,186
Recorded Total Loans	36,737	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	1,771	1,803
Current	30,314	30,619
Recorded Total Loans	32,085	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	3,393	1,927
Non-Accrual	4,766	4,860
Current	463,074	465,900
Recorded Total Loans	471,233	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	2,965	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	428	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	24,908	31,543
Non-Accrual	5,124	5,103
Current	2,084,709	2,049,790
Recorded Total Loans	2,114,741	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	18,288	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	4,237	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	2,383	3,047
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	21,181	25,937
Non-Accrual	2,135	2,145
Current	1,575,393	1,538,593
Recorded Total Loans	1,598,709	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	15,407	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	3,552	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	2,222	2,499
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,307	5,009
Non-Accrual	2,926	2,851
Current	447,902	448,797
Recorded Total Loans	454,135	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	2,635	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	614	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	58	528
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	420	597
Non-Accrual	63	107
Current	61,414	62,400
Recorded Total Loans	61,897	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	246	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	71	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	103	20
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,766	4,303
Non-Accrual	8,585	6,682
Current	1,071,170	1,052,158
Recorded Total Loans	1,082,521	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	2,444	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	322	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	0	1,406
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,005	1,674
Non-Accrual	4,314	5,635
Current	471,807	492,785
Recorded Total Loans	478,126	500,094
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,979	1,229
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	17	88
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	9	357
Acquired Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	441	236
Non-Accrual	1,689	2,695
Current	225,891	234,687
Recorded Total Loans	228,021	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	441	236
Acquired Loans [Member] | Commercial Loans [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] | 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	45,908	49,447
Recorded Total Loans	45,908	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	0	0
Non-Accrual	889	1,891
Current	132,611	135,398
Recorded Total Loans	133,500	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	0	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	441	236
Non-Accrual	800	804
Current	47,372	49,842
Recorded Total Loans	48,613	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	441	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	249	474
Non-Accrual	248	304
Current	56,355	62,227
Recorded Total Loans	56,852	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	238	384
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2	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	9	30
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	47	105
Non-Accrual	39	47
Current	5,713	8,541
Recorded Total Loans	5,799	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	37	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	1	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	9	0
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	177	337
Non-Accrual	196	237
Current	47,716	50,553
Recorded Total Loans	48,089	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	177	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	0	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	25	32
Non-Accrual	13	20
Current	2,926	3,133
Recorded Total Loans	2,964	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	24	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	1	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	0	0
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,315	964
Non-Accrual	2,377	2,636
Current	189,561	195,871
Recorded Total Loans	193,253	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	1,300	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	15	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 and38

Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	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
With an allowance recorded [Abstract]
Recorded investment balance (book)	25,309		$ 28,874
Unpaid principal balance (legal)	27,351		31,582
Related allowance	422		1,517
Average recorded investment	25,672	$ 33,374
Interest income recognized	206	324
Originated Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	24,141		21,912
Unpaid principal balance (legal)	26,183		24,321
With an allowance recorded [Abstract]
Average recorded investment	25,371	32,169
Interest income recognized	206	324
Originated Loans [Member] | Commercial Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	9,568		7,313
Unpaid principal balance (legal)	9,868		7,970
With an allowance recorded [Abstract]
Recorded investment balance (book)	1,168		5,757
Unpaid principal balance (legal)	1,168		5,940
Related allowance	422		826
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	3,495		1,278
Unpaid principal balance (legal)	3,536		1,697
With an allowance recorded [Abstract]
Average recorded investment	2,926	2,773
Interest income recognized	0	19
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	3,778		3,816
Unpaid principal balance (legal)	3,810		3,841
With an allowance recorded [Abstract]
Recorded investment balance (book)	1,081		5,553
Unpaid principal balance (legal)	1,081		5,736
Related allowance	335		735
Average recorded investment	5,995	13,509
Interest income recognized	44	100
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	130		130
Unpaid principal balance (legal)	138		137
With an allowance recorded [Abstract]
Recorded investment balance (book)	37		49
Unpaid principal balance (legal)	37		49
Related allowance	37		37
Average recorded investment	173	158
Interest income recognized	0	0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	1,520		1,434
Unpaid principal balance (legal)	1,660		1,567
With an allowance recorded [Abstract]
Recorded investment balance (book)	50		155
Unpaid principal balance (legal)	50		155
Related allowance	50		54
Average recorded investment	1,580	616
Interest income recognized	11	11
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	645		655
Unpaid principal balance (legal)	724		728
With an allowance recorded [Abstract]
Average recorded investment	650	978
Interest income recognized	2	6
Originated Loans [Member] | Consumer Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,379		8,488
Unpaid principal balance (legal)	9,287		9,445
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	5		5
Unpaid principal balance (legal)	15		16
With an allowance recorded [Abstract]
Average recorded investment	5	11
Interest income recognized	0	0
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,374		8,483
Unpaid principal balance (legal)	9,272		9,429
With an allowance recorded [Abstract]
Average recorded investment	8,431	8,003
Interest income recognized	110	121
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	6,194		6,111
Unpaid principal balance (legal)	7,028		6,906
With an allowance recorded [Abstract]
Average recorded investment	5,611	6,121
Interest income recognized	39	67
Acquired Loans [Member]
With an allowance recorded [Abstract]
Average recorded investment	301	1,205
Interest income recognized	0	0
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
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
Related allowance	0		$ 691
Average recorded investment	301	1,205
Interest income recognized	$ 0	$ 0

Allowance for Loan Losses and39

Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 6,272,303	$ 6,198,057
Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,824,936	2,786,002
Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,171,593	2,149,441
Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,275,774	1,262,614
Originated Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,794,177	5,697,963
Originated Loans [Member] | Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,596,915	2,548,384
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,125,682	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	2,006,887	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	47,063	40,724
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	71,727	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	707,588	653,570
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	658,916	616,829
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	12,987	7,750
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	35,685	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	1,349,272	1,351,789
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,286,478	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	31,208	31,053
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	31,586	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	36,737	37,916
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	34,144	36,762
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	310	25
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,278	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	32,085	32,422
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	27,349	28,912
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,558	1,896
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,178	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	471,233	472,687
Originated Loans [Member] | Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	471,233	472,687
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	457,783	458,864
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13,450	13,823
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	471,233	472,687
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	457,783	458,864
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13,450	13,823
Originated Loans [Member] | Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,114,741	2,086,436
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,107,234	2,078,286
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,507	8,150
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,598,709	1,566,675
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,594,352	1,562,031
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,357	4,644
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	454,135	456,657
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	451,151	453,278
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,984	3,379
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,897	63,104
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,731	62,977
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	166	127
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,082,521	1,063,143
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,073,936	1,055,055
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8,585	8,088
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,082,521	1,063,143
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,073,936	1,055,055
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8,585	8,088
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	478,126	500,094
Acquired Loans [Member] | Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	228,021	237,618
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	179,408	186,736
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	168,314	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	2,938	1,307
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8,156	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	45,908	49,447
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	44,782	48,194
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	55	76
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,071	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	133,500	137,289
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	123,532	127,660
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,883	1,231
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	7,085	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	48,613	50,882
Acquired Loans [Member] | Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	48,613	50,882
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	44,889	47,347
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,724	3,535
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	48,613	50,882
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	44,889	47,347
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,724	3,535
Acquired Loans [Member] | Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	56,852	63,005
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	56,595	62,671
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	257	334
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,799	8,693
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,751	8,646
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	48	47
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	48,089	51,127
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	47,893	50,860
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	196	267
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,964	3,185
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,951	3,165
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13	20
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	193,253	199,471
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	190,876	196,508
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,377	2,963
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	193,253	199,471
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	190,876	196,508
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 2,377	$ 2,963

Allowance for Loan Losses and40

Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)Contract	Mar. 31, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	3	16
Pre-modification outstanding recorded investment	$ 219	$ 1,566
Post-modification outstanding recorded investment	$ 215	$ 1,389
Number of TDR loans with subsequent default | Contract	0	1
Outstanding recorded investment on TDR loans with subsequent default	$ 0	$ 175
Consumer Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	2	12
Pre-modification outstanding recorded investment	$ 78	$ 1,035
Post-modification outstanding recorded investment	$ 77	$ 952
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	2	12
Pre-modification outstanding recorded investment	$ 78	$ 1,035
Post-modification outstanding recorded investment	$ 77	$ 952
Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	1	4
Pre-modification outstanding recorded investment	$ 141	$ 531
Post-modification outstanding recorded investment	$ 138	$ 437
Number of TDR loans with subsequent default | Contract	0	1
Outstanding recorded investment on TDR loans with subsequent default	$ 0	$ 175

Defined Benefit Postretiremen41

Defined Benefit Postretirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Postretirement Plans [Abstract]
Employer contributions	$ 0
Pension Benefits [Member]
Components of net periodic cost (benefit) [Abstract]
Service cost	402	$ 560
Interest cost	1,042	1,051
Expected return on plan assets	(1,985)	(1,835)
Net amortization	415	483
Total cost (benefit)	(126)	259
Other Benefits [Member]
Components of net periodic cost (benefit) [Abstract]
Service cost	3	4
Interest cost	86	94
Expected return on plan assets	0	0
Net amortization	20	29
Total cost (benefit)	$ 109	$ 127

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,513,000	43,342,000
Net income available to common stockholders	$ 20,279	$ 18,891
Basic EPS (in dollars per share)	$ 0.47	$ 0.44
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,883,000	43,342,000
Dilutive effect of common stock options and restricted stock (in shares)	371,000	365,000
Weighted average common shares and common share equivalents (in shares)	44,254,000	43,707,000
Net income available to common stockholders	$ 20,279	$ 18,891
Diluted EPS (in dollars per share)	$ 0.46	$ 0.43
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from calculation of diluted EPS (in shares)	783	30,861

Reclassification Adjustments 43

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (gains) losses	$ 0	$ (29)
Interest income	68,491	64,577
Other noninterest income	2,938	3,449
Salaries and employee benefits	33,587	32,441
Income tax (expense)	(8,301)	(9,731)
Net income	20,279	18,891
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification during the period, net of tax	1,227	475
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 (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense)	(592)	(105)
Net income	958	162
(Gains) on Available for Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (gains) losses	0	(29)
Amortization of Unrealized Gains and Losses Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	238	296
Impairment (Write-Down) of Equity Security [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [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 (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense)	(166)	(199)
Net income	269	313
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	435	515
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ 0	$ (3)

Fair Value Measurements and F44

Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 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
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	0
AFS securities [Abstract]
Securities available for sale, at estimated fair value	1,367,574	1,338,290
Trading securities	10,044	9,259
Liabilities [Abstract]
Collateral dependent impaired financing receivable with specific reserves	1,200		$ 9,000
Allowance for loan losses for collateral dependent impaired loans with specific reserves	$ 400		$ 3,000
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]
Securities available for sale, at estimated fair value	$ 159,581	174,408
State & Municipal [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	47,844	46,726
Other Securities [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	19,141	20,739
Recurring Basis [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	1,367,574	1,338,290
Trading securities	10,044	9,259
Interest rate swaps	3,971	3,210
Total	1,381,589	1,350,759
Liabilities [Abstract]
Interest rate swaps	736	506
Total	736	506
Recurring Basis [Member] | Level 1 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	10,923	11,493
Trading securities	10,044	9,259
Interest rate swaps	0	0
Total	20,967	20,752
Liabilities [Abstract]
Interest rate swaps	0	0
Total	0	0
Recurring Basis [Member] | Level 2 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	1,356,651	1,326,797
Trading securities	0	0
Interest rate swaps	3,971	3,210
Total	1,360,622	1,330,007
Liabilities [Abstract]
Interest rate swaps	736	506
Total	736	506
Recurring Basis [Member] | Level 3 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Trading securities	0	0
Interest rate swaps	0	0
Total	0	0
Liabilities [Abstract]
Interest rate swaps	0	0
Total	0	0
Recurring Basis [Member] | Federal Agency [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	159,581	174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 1 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | Federal Agency [Member] | Level 2 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	159,581	174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 3 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | State & Municipal [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	47,844	46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 1 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | State & Municipal [Member] | Level 2 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	47,844	46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 3 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | Mortgage-Backed [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	578,027	529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 1 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 2 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	578,027	529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 3 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	562,981	566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 1 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	562,981	566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	0	0
Recurring Basis [Member] | Other Securities [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	19,141	20,739
Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	10,923	11,493
Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	8,218	9,246
Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member]
AFS securities [Abstract]
Securities available for sale, at estimated fair value	$ 0	$ 0

Fair Value Measurements and F45

Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial assets [Abstract]
Securities held to maturity	$ 513,654	$ 525,050
Financial liabilities [Abstract]
Time deposits	826,080	872,411
Long-term debt	104,023	104,087
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Level 2 [Member]
Financial assets [Abstract]
Securities held to maturity	515,793	527,948
Financial liabilities [Abstract]
Time deposits	826,080	872,411
Long-term debt	104,023	104,087
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	6,206,603	6,132,857
Estimated Fair Value [Member] | Level 2 [Member]
Financial assets [Abstract]
Securities held to maturity	513,654	525,050
Financial liabilities [Abstract]
Time deposits	821,557	868,153
Long-term debt	103,976	104,113
Junior subordinated debt	101,922	102,262
Estimated Fair Value [Member] | Level 3 [Member]
Financial assets [Abstract]
Net loans	6,354,631	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	394,900	371,100
Fair value of derivative asset	700	300
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	394,900	371,100
Fair value of derivative liability	700	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	$ 3,200	$ 2,700

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Commitment to Extend Credits and Unused Lines of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 1,500	$ 1,500
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Obligation instrument term	5 years
Commitments - maximum potential obligation	$ 48.9	$ 36.8