NBT Bancorp (NBTB) 10-Q 9 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 30, 2015
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		43,290,202
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 175,036	$ 139,635
Short-term interest bearing accounts	9,964	7,001
Securities available for sale, at fair value	1,058,397	1,013,171
Securities held to maturity (fair value $475,436 and $454,994, respectively)	470,758	454,361
Trading securities	7,900	7,793
Federal Reserve and Federal Home Loan Bank stock	34,001	32,626
Loans	5,870,988	5,595,271
Less allowance for loan losses	64,859	66,359
Net loans	5,806,129	5,528,912
Premises and equipment, net	87,763	89,258
Goodwill	263,634	263,634
Intangible assets, net	16,729	20,317
Bank owned life insurance	116,128	114,251
Other assets	115,123	126,967
Total assets	8,161,562	7,797,926
Liabilities
Demand (noninterest bearing)	1,915,482	1,838,622
Savings, NOW, and money market	3,753,179	3,417,160
Time	931,966	1,043,823
Total deposits	6,600,627	6,299,605
Short-term borrowings	362,332	316,802
Long-term debt	130,635	130,945
Junior subordinated debt	101,196	101,196
Other liabilities	90,556	85,197
Total liabilities	7,285,346	6,933,745
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at September 30, 2015 and December 31, 2014	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at September 30, 2015 and December 31, 2014; issued 49,651,494 at September 30, 2015 and December 31, 2014	497	497
Additional paid-in-capital	576,478	576,504
Retained earnings	452,701	423,956
Accumulated other comprehensive loss	(13,365)	(17,027)
Common stock in treasury, at cost, 6,465,233 and 5,755,040 shares at September 30, 2015 and December 31, 2014, respectively	(140,095)	(119,749)
Total stockholders' equity	876,216	864,181
Total liabilities and stockholders' equity	$ 8,161,562	$ 7,797,926

Consolidated Balance Sheets (u3

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Securities held to maturity fair value	$ 475,436	$ 454,994
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)	49,651,494	49,651,494
Common stock in treasury, at cost (in shares)	6,465,233	5,755,040

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest, fee, and dividend income
Interest and fees on loans	$ 61,656	$ 61,173	$ 181,047	$ 181,747
Securities available for sale	5,125	6,095	15,214	19,464
Securities held to maturity	2,318	1,353	6,916	2,904
Other	401	513	1,276	1,552
Total interest, fee, and dividend income	69,500	69,134	204,453	205,667
Interest expense
Deposits	3,554	3,498	10,644	9,782
Short-term borrowings	296	262	561	702
Long-term debt	845	1,067	2,507	5,709
Junior subordinated debt	560	544	1,645	1,620
Total interest expense	5,255	5,371	15,357	17,813
Net interest income	64,245	63,763	189,096	187,854
Provision for loan losses	4,966	4,885	12,506	12,647
Net interest income after provision for loan losses	59,279	58,878	176,590	175,207
Noninterest income
Insurance and other financial services revenue	5,862	6,179	18,072	18,510
Service charges on deposit accounts	4,349	4,519	12,706	13,285
ATM and debit card fees	4,780	4,440	13,707	12,869
Retirement plan administration fees	3,249	3,272	10,011	9,167
Trust	4,611	4,758	14,257	14,157
Bank owned life insurance	931	1,095	3,418	3,455
Net securities gains	3	38	43	59
Gain on the sale of equity investment	4,179	0	4,179	19,401
Other	3,297	2,376	9,617	8,078
Total noninterest income	31,261	26,677	86,010	98,981
Noninterest expense
Salaries and employee benefits	30,227	28,933	91,240	89,609
Occupancy	5,326	5,211	16,804	16,872
Data processing and communications	4,207	4,029	12,598	12,045
Professional fees and outside services	3,137	3,695	10,029	10,862
Equipment	3,352	3,199	9,917	9,447
Office supplies and postage	1,576	1,733	4,822	5,221
FDIC expenses	1,355	1,134	3,833	3,641
Advertising	421	403	1,874	1,868
Amortization of intangible assets	1,165	1,275	3,636	3,821
Loan collection and other real estate owned, net	699	705	1,593	2,546
Prepayment penalties on long-term debt	0	13,349	0	17,903
Other	8,426	5,401	19,211	15,485
Total noninterest expense	59,891	69,067	175,557	189,320
Income before income tax expense	30,649	16,488	87,043	84,868
Income tax expense	10,798	5,576	29,745	28,307
Net income	$ 19,851	$ 10,912	$ 57,298	$ 56,561
Earnings per share
Basic (in dollars per share)	$ 0.45	$ 0.25	$ 1.30	$ 1.29
Diluted (in dollars per share)	$ 0.45	$ 0.25	$ 1.29	$ 1.28

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 19,851	$ 10,912	$ 57,298	$ 56,561
Other comprehensive (loss) income, net of tax:
Unrealized net holding gains (losses) arising during the period (pre-tax amounts of $3,801, (3,693), $3,367 and $13,199)	2,323	(2,124)	2,057	8,075
Reclassification adjustment for net gains related to securities available for sale included in net income (pre-tax amounts of $3, $38, $43 and $59)	(2)	(23)	(26)	(35)
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity (pre-tax amounts of $328, ($99), $999 and ($99))	200	(59)	610	(59)
Pension and other benefits:
Amortization of prior service cost and actuarial gains (pre-tax amounts of $551, $19, $1,673 and $57)	337	11	1,021	34
Total other comprehensive (loss) income	2,858	(2,195)	3,662	8,015
Comprehensive income	$ 22,709	$ 8,717	$ 60,960	$ 64,576

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other comprehensive (loss) income, net of tax:
Unrealized net holding gains (losses) arising during the period, pre-tax amounts	$ 3,801	$ (3,693)	$ 3,367	$ 13,199
Reclassification adjustment for net gains related to securities available for sale included in net income, pre-tax amounts	3	38	43	59
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts	328	(99)	999	(99)
Amortization of prior service cost and actuarial gains, pre-tax amounts	$ 551	$ 19	$ 1,673	$ 57

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Common Stock in Treasury [Member]	Total
Beginning Balance at Dec. 31, 2013	$ 497	$ 574,152	$ 385,787	$ (16,765)	$ (127,102)	$ 816,569
Net income	0	0	56,561	0	0	56,561
Cash dividends	0	0	(27,653)	0	0	(27,653)
Purchases of treasury shares	0	0	0	0	(72)	(72)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(2,312)	0	0	3,515	1,203
Stock-based compensation	0	2,817	0	0	0	2,817
Other comprehensive income	0	0	0	8,015	0	8,015
Ending Balance at Sep. 30, 2014	497	574,657	414,695	(8,750)	(123,659)	857,440
Beginning Balance at Dec. 31, 2014	497	576,504	423,956	(17,027)	(119,749)	864,181
Net income	0	0	57,298	0	0	57,298
Cash dividends	0	0	(28,553)	0	0	(28,553)
Purchases of treasury shares	0	0	0	0	(26,797)	(26,797)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(3,423)	0	0	6,451	3,028
Stock-based compensation	0	3,397	0	0	0	3,397
Other comprehensive income	0	0	0	3,662	0	3,662
Ending Balance at Sep. 30, 2015	$ 497	$ 576,478	$ 452,701	$ (13,365)	$ (140,095)	$ 876,216

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.65	$ 0.63
Purchase of treasury shares (in shares)	1,047,152	3,288
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit (in shares)	336,959	197,036

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 57,298	$ 56,561
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	12,506	12,647
Depreciation and amortization of premises and equipment	6,494	6,172
Net accretion on securities	1,851	2,692
Amortization of intangible assets	3,636	3,821
Stock based compensation	3,397	2,817
Bank owned life insurance income	(3,418)	(3,455)
Purchases of trading securities	(767)	(1,618)
Losses (gains) on trading securities	660	(225)
Proceeds from sales of loans held for sale	50,998	4,024
Originations and purchases of loans held for sale	(49,125)	(6,872)
Net gains on sales of loans held for sale	(108)	(3)
Net security gains	(43)	(59)
Net gain on sales of other real estate owned	(1,241)	(351)
Gain on sale of equity investment	(4,179)	(19,401)
Prepayment penalties on long-term debt	0	17,903
Net decrease (increase) in other assets	8,846	(19,117)
Net increase in other liabilities	6,252	3,239
Net cash provided by operating activities	93,057	58,775
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	229,347	178,430
Purchases	(272,596)	(175,033)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	61,379	26,830
Purchases	(74,951)	(33,601)
Other:
Net increase in loans	(294,187)	(191,327)
Proceeds from FHLB stock redemption	39,740	63,186
Purchases of Federal Reserve and FHLB stock	(41,115)	(50,974)
Proceeds from settlement of bank owned life insurance	1,541	1,319
Purchases of premises and equipment	(4,999)	(6,616)
Proceeds from sale of equity investment	4,179	19,639
Proceeds from the sales of other real estate owned	3,049	2,863
Net cash used in investing activities	(348,613)	(165,284)
Financing activities
Net increase in deposits	301,022	424,715
Net increase (decrease) in short-term borrowings	45,530	(80,405)
Proceeds from issuance of long-term debt	0	120,051
Repayments of long-term debt	(310)	(315,721)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	3,028	1,203
Purchase of treasury stock	(26,797)	(72)
Cash dividends	(28,553)	(27,653)
Net cash provided by financing activities	293,920	122,118
Net increase in cash and cash equivalents	38,364	15,609
Cash and cash equivalents at beginning of period	146,636	158,926
Cash and cash equivalents at end of period	185,000	174,535
Cash paid during the period for:
Interest	16,252	18,714
Income taxes paid	19,027	36,978
Noncash investing activities:
Loans transferred to other real estate owned	2,699	1,135
Preferred stock acquired from sale of equity investment	0	2,762
Transfer of available for sale securities to held to maturity portfolio	$ 0	$ 332,115

Description of Business

Description of Business	9 Months Ended
	Sep. 30, 2015
Description of Business [Abstract]
Description of Business	Note 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, northwestern Vermont, western Massachusetts, southern New Hampshire, and southern Maine. 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	9 Months Ended
	Sep. 30, 2015
Basis of Presentation [Abstract]
Basis of Presentation	Note 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, NBT Holdings, and Hathaway Agency, Inc. 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 2014 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	9 Months Ended
	Sep. 30, 2015
Securities [Abstract]
Securities	Note 3. Securities The amortized cost, estimated fair value, and unrealized gains and losses of securities available for sale are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value September 30, 2015 Federal Agency $ 342,140 $ 1,245 $ (122 ) $ 343,263 State & municipal 33,140 510 (3 ) 33,647 Mortgage-backed: Government-sponsored enterprises 313,840 7,118 (105 ) 320,853 U.S. government agency securities 14,293 728 (64 ) 14,957 Collateralized mortgage obligations: Government-sponsored enterprises 296,005 2,638 (63 ) 298,580 U.S. government agency securities 31,302 485 (21 ) 31,766 Other securities 12,900 2,531 (100 ) 15,331 Total securities available for sale $ 1,043,620 $ 15,255 $ (478 ) $ 1,058,397 December 31, 2014 U.S. Treasury $ 23,041 $ 70 $ - $ 23,111 Federal Agency 332,193 327 (2,606 ) 329,914 State & municipal 37,035 587 (52 ) 37,570 Mortgage-backed: Government-sponsored enterprises 339,190 7,597 (224 ) 346,563 U.S. government agency securities 17,367 863 (66 ) 18,164 Collateralized mortgage obligations: Government-sponsored enterprises 199,837 1,828 (234 ) 201,431 U.S. government agency securities 40,237 497 (36 ) 40,698 Other securities 12,818 3,054 (152 ) 15,720 Total securities available for sale $ 1,001,718 $ 14,823 $ (3,370 ) $ 1,013,171 Other Securities with amortized costs totaling $1.1 billion at September 30, 2015 and $1.0 billion at December 31, 2014 were pledged to secure public deposits and for other purposes required or permitted by law. At September 30, 2015 and December 31, 2014, securities with an amortized cost of $174.8 million and $208.8 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 are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value September 30, 2015 Mortgage-backed: Government-sponsored enterprises $ 9,782 $ - $ (25 ) $ 9,757 U.S. government agency securities 665 107 - 772 Collateralized mortgage obligations: Government-sponsored enterprises 282,966 4,081 (951 ) 286,096 State & municipal 177,345 1,509 (43 ) 178,811 Total securities held to maturity $ 470,758 $ 5,697 $ (1,019 ) $ 475,436 December 31, 2014 Mortgage-backed: Government-sponsored enterprises $ 755 $ 113 $ - $ 868 Collateralized mortgage obligations: Government-sponsored enterprises 317,628 1,934 (1,965 ) 317,597 State & municipal 135,978 674 (123 ) 136,529 Total securities held to maturity $ 454,361 $ 2,721 $ (2,088 ) $ 454,994 The following table sets forth information with regard to investment securities with unrealized losses for the periods presented: 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 September 30, 2015 Investment securities available for sale: Federal agency $ 19,962 $ (30 ) 2 $ 29,908 $ (92 ) 3 $ 49,870 $ (122 ) 5 State & municipal 2,957 (3 ) 4 - - - 2,957 (3 ) 4 Mortgage-backed 11,656 (109 ) 14 4,319 (60 ) 16 15,975 (169 ) 30 Collateralized mortgage obligations 29,608 (62 ) 5 4,340 (22 ) 3 33,948 (84 ) 8 Other securities - - - 3,931 (100 ) 3 3,931 (100 ) 3 Total securities with unrealized losses $ 64,183 $ (204 ) 25 $ 42,498 $ (274 ) 25 $ 106,681 $ (478 ) 50 September 30, 2015 Investment securities held to maturity: Mortgage-backed $ 9,757 $ (25 ) 1 $ - $ - - $ 9,757 $ (25 ) 1 Collateralized mortgage obligations - - - 43,127 (951 ) 4 43,127 (951 ) 4 State & municipal 6,313 (43 ) 11 - - - 6,313 (43 ) 11 Total securities with unrealized losses $ 16,070 $ (68 ) 12 $ 43,127 $ (951 ) 4 $ 59,197 $ (1,019 ) 16 December 31, 2014 Investment securities available for sale: Federal agency $ 66,528 $ (226 ) 8 $ 198,151 $ (2,380 ) 16 $ 264,679 $ (2,606 ) 24 State & municipal 8,818 (42 ) 33 1,321 (10 ) 5 10,139 (52 ) 38 Mortgage-backed 10,400 (36 ) 10 35,565 (254 ) 31 45,965 (290 ) 41 Collateralized mortgage obligations 57,682 (196 ) 8 6,598 (74 ) 4 64,280 (270 ) 12 Other securities - - - 3,201 (152 ) 2 3,201 (152 ) 2 Total securities with unrealized losses $ 143,428 $ (500 ) 59 $ 244,836 $ (2,870 ) 58 $ 388,264 $ (3,370 ) 117 December 31, 2014 Investment securities held to maturity: Collateralized mortgage obligations $ 26,052 $ (49 ) 2 $ 46,415 $ (1,916 ) 4 $ 72,467 $ (1,965 ) 6 State & municipal 43,514 (116 ) 110 1,619 (7 ) 6 45,133 (123 ) 116 Total securities with unrealized losses $ 69,566 $ (165 ) 112 $ 48,034 $ (1,923 ) 10 $ 117,600 $ (2,088 ) 122 Management has the intent to hold the securities classified as held to maturity until they mature, at which time it is believed the Company will receive full value for the securities. Furthermore, as of September 30, 2015, management also has the intent to hold, and will not be required to sell, the securities classified as available for sale for a period of time sufficient for a recovery of cost, which may be until maturity. The unrealized losses 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 fair value is expected to recover as the bonds approach their maturity date or repricing date or if market yields for such investments decline. As of September 30, 2015, management believes the impairments detailed in the table above are temporary and no other-than-temporary impairment losses have been realized in the Company’s consolidated statements of income. The following tables set forth information with regard to contractual maturities of debt securities at September 30, 2015: (In thousands) Amortized cost Estimated fair value Debt securities classified as available for sale Within one year $ 4,031 $ 4,058 From one to five years 369,188 371,294 From five to ten years 137,908 140,701 After ten years 519,593 527,013 $ 1,030,720 $ 1,043,066 Debt securities classified as held to maturity Within one year $ 42,420 $ 42,427 From one to five years 15,186 15,260 From five to ten years 107,816 109,043 After ten years 305,336 308,706 $ 470,758 $ 475,436 Maturities of mortgage-backed and collateralized mortgage obligations 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 September 30, 2015.

Allowance for Loan Losses and C

Allowance for Loan Losses and Credit Quality of Loans	9 Months Ended
	Sep. 30, 2015
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Allowance for Loan Losses and Credit Quality of Loans	Note 4. Allowance for Loan Losses and Credit Quality of Loans Allowance for Loan Losses The allowance for loan losses is maintained at a level estimated by management to provide adequately for probable incurred losses inherent in the current loan portfolio. The adequacy of the allowance for loan losses is continuously monitored. It is assessed for adequacy using a methodology designed to ensure the level of the allowance reasonably reflects the loan portfolio’s risk profile. It is evaluated to ensure that it is sufficient to absorb all reasonably estimable credit losses inherent in the current loan portfolio. To develop and document a systematic methodology for determining the allowance for loan losses, the Company has divided the loan portfolio into three segments, each with different risk characteristics and methodologies for assessing risk. Those segments are further segregated between our loans accounted for under the amortized cost method (referred to as “originated” loans) and loans acquired in a business combination (referred to as “acquired” loans). Each portfolio segment is broken down into class segments where appropriate. Class segments contain unique measurement attributes, risk characteristics and methods for monitoring and assessing risk that are necessary to develop the allowance for loan losses. Unique characteristics such as borrower type, loan type, collateral type, and risk characteristics define each class segment. The following table illustrates the portfolio and class segments for the Company’s loan portfolio: Portfolio Class Commercial Loans Commercial Commercial Real Estate Agricultural Agricultural Real Estate Business Banking Consumer Loans Indirect Home Equity Direct Residential Real Estate Mortgages Commercial Loans The Company offers a variety of commercial loan products including commercial (non-real estate), commercial real estate, agricultural, agricultural real estate, and business banking loans. The Company’s underwriting analysis for commercial loans typically includes credit verification, independent appraisals, a review of the borrower’s financial condition, and a detailed analysis of the borrower’s underlying cash flows. Commercial (non-Real Estate) – Commercial Real Estate – Agricultural Agricultural Real Estate Business Banking - Consumer Loans The Company offers a variety of consumer loan products including indirect, home equity, and direct loans. Indirect – Home Equity Direct – Residential Real Estate Mortgages Residential real estate loans consist primarily of loans secured by first or second deeds of trust on primary residences. We originate adjustable-rate and fixed-rate, one-to-four-family residential real estate loans for the construction, purchase or refinancing of a residential mortgage. These loans are collateralized by owner-occupied properties located in the Company’s market area. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower), or have private mortgage insurance. The Company’s underwriting analysis for residential mortgage loans typically includes credit verification, independent appraisals, and a review of the borrower’s financial condition. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. For purposes of evaluating the adequacy of the allowance, the Company considers a number of significant factors that affect the collectability of the portfolio. For individually analyzed loans, these include estimates of loss exposure, which reflect the facts and circumstances that affect the likelihood of repayment of such loans as of the evaluation date. For homogeneous pools of loans, estimates of the Company’s exposure to credit loss reflect a current assessment of a number of factors, which could affect collectability. These factors include: past loss experience; size, trend, composition, and nature of loans; changes in lending policies and procedures, including underwriting standards and collection, charge-offs and recoveries; trends experienced in nonperforming and delinquent loans; current economic conditions in the Company’s market; portfolio concentrations that may affect loss experienced across one or more components of the portfolio; the effect of external factors such as competition, legal and regulatory requirements; and the experience, ability, and depth of lending management and staff. In addition, various regulatory agencies, as an integral component of their examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to make loan grade changes as well as recognize additions to the allowance based on their examinations. After a thorough consideration of the factors discussed above, any required additions or reductions to the allowance for loan losses are made periodically by charges or credits to the provision for loan losses. These charges or credits are necessary to maintain the allowance at a level which management believes is reasonably 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 and nine months ended September 30, 2015 and 2014: Three months ended September 30, Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of June 30, 2015 $ 28,326 $ 28,314 $ 8,281 $ 38 $ 64,959 Charge-offs (1,333 ) (4,530 ) (511 ) - (6,374 ) Recoveries 258 889 161 - 1,308 Provision (2,800 ) 7,333 51 382 4,966 Ending Balance as of September 30, 2015 $ 24,451 $ 32,006 $ 7,982 $ 420 $ 64,859 Balance as of June 30, 2014 $ 35,123 $ 27,973 $ 6,205 $ 233 $ 69,534 Charge-offs (1,517 ) (3,979 ) (481 ) - (5,977 ) Recoveries 253 632 7 - 892 Provision 1,779 2,826 212 68 4,885 Ending Balance as of September 30, 2014 $ 35,638 $ 27,452 $ 5,943 $ 301 $ 69,334 Nine months ended September 30, Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of December 31, 2014 $ 32,433 $ 26,720 $ 7,130 $ 76 $ 66,359 Charge-offs (2,715 ) (13,183 ) (1,524 ) - (17,422 ) Recoveries 772 2,334 310 - 3,416 Provision (6,039 ) 16,135 2,066 344 12,506 Ending Balance as of September 30, 2015 $ 24,451 $ 32,006 $ 7,982 $ 420 $ 64,859 Balance as of December 31, 2013 $ 35,090 $ 27,694 $ 6,520 $ 130 $ 69,434 Charge-offs (3,423 ) (11,659 ) (965 ) - (16,047 ) Recoveries 966 2,087 247 - 3,300 Provision 3,005 9,330 141 171 12,647 Ending Balance as of September 30, 2014 $ 35,638 $ 27,452 $ 5,943 $ 301 $ 69,334 As of September 30, 2015, included in the above tables, there was $1.9 million in the allowance for loan losses related to acquired commercial loans. There was $3.0 in the allowance for loan losses as of September 30, 2014 related to acquired loans. Net charge-offs related to acquired loans totaled approximately $0.5 million and $0.3 million during the three months ended September 30, 2015 and 2014, respectively, and approximately $1.2 million and $0.5 million during the nine months ended September 30, 2015 and 2014, respectively, and are included in the table above. The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments as of September 30, 2015 and December 31, 2014: Allowance for Loan Losses and Recorded Investment in Loans (in thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total As of September 30, 2015 Allowance for loan losses $ 24,451 $ 32,006 $ 7,982 $ 420 $ 64,859 Allowance for loans individually evaluated for impairment 3,545 - - 3,545 Allowance for loans collectively evaluated for impairment $ 20,906 $ 32,006 $ 7,982 $ 420 $ 61,314 Ending balance of loans $ 2,602,385 $ 2,091,408 $ 1,177,195 $ 5,870,988 Ending balance of originated loans individually evaluated for impairment 12,559 7,590 5,867 26,016 Ending balance of acquired loans individually evaluated for impairment 9,317 - - 9,317 Ending balance of acquired loans collectively evaluated for impairment 295,890 106,968 241,646 644,504 Ending balance of originated loans collectively evaluated for impairment $ 2,284,619 $ 1,976,850 $ 929,682 $ 5,191,151 As of December 31, 2014 Allowance for loan losses $ 32,433 $ 26,720 $ 7,130 $ 76 $ 66,359 Allowance for loans individually evaluated for impairment 1,100 - - 1,100 Allowance for loans collectively evaluated for impairment $ 31,333 $ 26,720 $ 7,130 $ 76 $ 65,259 Ending balance of loans $ 2,473,702 $ 2,005,980 $ 1,115,589 $ 5,595,271 Ending balance of originated loans individually evaluated for impairment 11,079 5,498 3,544 20,121 Ending balance of acquired loans individually evaluated for impairment 5,675 - - 5,675 Ending balance of acquired loans collectively evaluated for impairment 327,656 147,256 266,747 741,659 Ending balance of originated loans collectively evaluated for impairment $ 2,129,292 $ 1,853,226 $ 845,298 $ 4,827,816 Credit Quality of Loans Loans are placed on nonaccrual status when timely collection of principal and interest in accordance with contractual terms is doubtful. This generally occurs 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. The Company’s nonaccrual policies are the same for all classes of financing receivable. 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. 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 September 30, 2015 and December 31, 2014: Age Analysis of Past Due Financing Receivables As of September 30, 2015 (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 Non-Accrual Current Recorded Total Loans ORIGINATED Commercial Loans Commercial $ 2,050 $ 100 $ - $ 2,150 $ 1,264 $ 647,577 $ 650,991 Commercial Real Estate 537 - - 537 6,236 1,176,523 1,183,296 Agricultural - - - - 900 32,486 33,386 Agricultural Real Estate 557 - - 557 500 25,758 26,815 Business Banking 1,930 145 - 2,075 4,947 395,668 402,690 5,074 245 - 5,319 13,847 2,278,012 2,297,178 Consumer Loans Indirect 15,041 3,159 1,488 19,688 1,718 1,431,946 1,453,352 Home Equity 4,091 1,205 384 5,680 5,436 462,546 473,662 Direct 526 99 59 684 86 56,656 57,426 19,658 4,463 1,931 26,052 7,240 1,951,148 1,984,440 Residential Real Estate Mortgages 2,312 80 1,253 3,645 8,462 923,442 935,549 $ 27,044 $ 4,788 $ 3,184 $ 35,016 $ 29,549 $ 5,152,602 $ 5,217,167 ACQUIRED Commercial Loans Commercial $ - $ - $ - $ - $ 2,509 $ 69,553 $ 72,062 Commercial Real Estate - - - - 6,804 175,026 181,830 Business Banking 63 19 12 94 144 51,077 51,315 63 19 12 94 9,457 295,656 305,207 Consumer Loans Indirect 219 70 14 303 96 34,623 35,022 Home Equity 177 70 - 247 591 67,064 67,902 Direct 24 23 1 48 34 3,962 4,044 420 163 15 598 721 105,649 106,968 Residential Real Estate Mortgages 863 41 579 1,483 2,797 237,366 241,646 $ 1,346 $ 223 $ 606 $ 2,175 $ 12,975 $ 638,671 $ 653,821 Total Loans $ 28,390 $ 5,011 $ 3,790 $ 37,191 $ 42,524 $ 5,791,273 $ 5,870,988 Age Analysis of Past Due Financing Receivables As of December 31, 2014 (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 Non-Accrual Current Recorded Total Loans ORIGINATED Commercial Loans Commercial $ - $ 735 $ - $ 735 $ 1,012 $ 613,400 $ 615,147 Commercial Real Estate 192 - - 192 4,127 1,064,549 1,068,868 Agricultural - - - - 817 32,130 32,947 Agricultural Real Estate 19 - - 19 565 24,390 24,974 Business Banking 799 235 84 1,118 6,910 390,407 398,435 1,010 970 84 2,064 13,431 2,124,876 2,140,371 Consumer Loans Indirect 16,434 3,154 1,991 21,579 1,964 1,286,507 1,310,050 Home Equity 4,591 1,428 821 6,840 6,596 479,444 492,880 Direct 560 157 52 769 84 54,941 55,794 21,585 4,739 2,864 29,188 8,644 1,820,892 1,858,724 Residential Real Estate Mortgages 2,901 96 1,256 4,253 8,770 835,819 848,842 $ 25,496 $ 5,805 $ 4,204 $ 35,505 $ 30,845 $ 4,781,587 $ 4,847,937 ACQUIRED Commercial Loans Commercial $ - $ - $ - $ - $ 3,009 $ 72,255 $ 75,264 Commercial Real Estate - - - - 2,666 197,222 199,888 Business Banking 5 15 - 20 665 57,494 58,179 5 15 - 20 6,340 326,971 333,331 Consumer Loans Indirect 518 5 54 577 106 64,540 65,223 Home Equity 190 60 5 255 557 75,904 76,716 Direct 31 - 7 38 33 5,246 5,317 739 65 66 870 696 145,690 147,256 Residential Real Estate Mortgages 1,162 265 671 2,098 3,193 261,456 266,747 $ 1,906 $ 345 $ 737 $ 2,988 $ 10,229 $ 734,117 $ 747,334 Total Loans $ 27,402 $ 6,150 $ 4,941 $ 38,493 $ 41,074 $ 5,515,704 $ 5,595,271 There were no material commitments to extend further credit to borrowers with nonperforming loans. Impaired Loans The methodology used to establish the allowance for loan losses on impaired loans incorporates specific allocations on loans analyzed individually. Classified and nonperforming loans with outstanding balances of $0.5 million or more and all troubled debt restructured loans (“TDRs”) are evaluated for impairment through the Company’s quarterly status review process. In determining that we will be unable 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 impaired as defined by accounting standards, 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 discounted at the loan's original effective interest rate or 3) the loan’s observable market price. All impaired loans are reviewed on a quarterly basis for changes in the level of impairment. Any change to the previously recognized impairment loss is recognized as a change to the allowance account and recorded in the 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 September 30, 2015 and December 31, 2014: September 30, 2015 December 31, 2014 (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 $ 1,694 $ 1,846 $ 1,748 $ 1,901 Commercial Real Estate 3,187 3,198 4,505 4,520 Agricultural 19 25 20 26 Agricultural Real Estate 623 749 1,147 1,441 Business Banking 995 1,037 896 1,301 Total Commercial Loans 6,518 6,855 8,316 9,189 Consumer Loans Indirect 13 23 - - Home Equity 7,577 8,380 5,498 6,033 Direct - - - - Total Consumer Loans 7,590 8,403 5,498 6,033 Residential Real Estate Mortgages 5,867 6,386 3,544 3,959 Total 19,975 21,644 17,358 19,181 With an allowance recorded: Commercial Loans Commercial 948 953 300 - - - Commercial Real Estate 5,093 6,959 1,395 2,763 4,611 600 Total Commercial Loans 6,041 7,912 1,695 2,763 4,611 600 ACQUIRED With no related allowance recorded: Commercial Loans Commercial Real Estate 5,488 5,789 2,666 3,830 With an allowance recorded: Commercial Loans Commercial 2,508 4,668 1,000 3,009 4,668 500 Commercial Real Estate 1,321 1,321 850 - - - Total Commercial Loans 3,829 5,989 1,850 3,009 4,668 500 Total: $ 35,333 $ 41,334 $ 3,545 $ 25,796 $ 32,290 $ 1,100 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 September 30, 2015 and 2014: For the three months ended September 30, 2015 September 30, 2014 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans Commercial $ 2,469 $ 42 $ 1,957 $ - Commercial Real Estate 8,560 42 9,619 43 Agricultural 19 - 102 - Agricultural Real Estate 626 11 1,395 12 Business Banking 1,003 3 677 10 Consumer Loans Indirect 20 - - - Home Equity 7,432 134 5,435 85 Direct - - - - Residential Real Estate Mortgage 5,564 37 2,961 29 Total Originated $ 25,693 $ 269 $ 22,146 $ 179 ACQUIRED Commercial Loans Commercial 2,531 - 6,161 - Commercial Real Estate 6,918 - 3,398 - Total Acquired $ 9,449 $ - $ 9,559 $ - Total Loans $ 35,142 $ 269 $ 31,705 $ 179 For the nine months ended September 30, 2015 September 30, 2014 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans Commercial $ 2,026 $ 128 $ 2,001 $ - Commercial Real Estate 8,884 124 10,400 127 Agricultural 19 1 115 1 Agricultural Real Estate 630 34 1,410 35 Business Banking 952 9 509 33 Consumer Loans Indirect 14 - - - Home Equity 6,869 298 5,099 188 Direct 1 - - - Residential Real Estate Mortgage 4,857 100 2,864 79 Total Originated $ 24,252 $ 694 $ 22,398 $ 463 ACQUIRED Commercial Loans Commercial 2,658 - 6,303 - Commercial Real Estate 7,070 - 3,461 - Total Acquired $ 9,728 $ - $ 9,764 $ - Total Loans $ 33,980 $ 694 $ 32,162 $ 463 Credit Quality Indicators The Company has developed an internal loan grading system to evaluate and quantify the Company’s loan portfolio with respect to quality and risk. The system focuses on, among other things, financial strength of borrowers, experience and depth of borrower’s management, primary and secondary sources of repayment, payment history, nature of the business, and outlook on particular industries. The internal grading system enables the Company to monitor the quality of the entire loan portfolio on a consistent basis and provide management with an early warning system, enabling recognition and response to problem loans and potential problem loans. Commercial Grading System For commercial and agricultural loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This would include comparison of financial strength to available industry averages, comparison of transaction factors (loan terms and conditions) to loan policy, and comparison of credit history to stated repayment terms and industry averages. Some grading factors are necessarily more subjective such as economic and industry factors, regulatory environment, and management. Classified commercial loans consist of loans graded substandard and below. The grading system for commercial and agricultural loans is as follows: ● Doubtful A doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the asset, its classification as a loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital, and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral, and refinancing. Generally, pending events should be resolved within a relatively short period and the ratings will be adjusted based on the new information. Nonaccrual treatment is required for doubtful assets because of the high probability of loss. ● Substandard Substandard loans have a high probability of payment default, or they have other well-defined weaknesses. They require more intensive supervision by bank management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity, or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some Substandard loans, the likelihood of full collection of interest and principal may be in doubt and those loans should be placed on nonaccrual. Although Substandard assets in the aggregate will have a distinct potential for loss, an individual asset’s loss potential does not have to be distinct for the asset to be rated Substandard. ● Special Mention Special Mention loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s position at some future date. These loans pose elevated risk, but their weakness does not yet justify a Substandard classification. Borrowers may be experiencing adverse operating trends (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 and it is expected that such timely payments of principal and interest will continue. Consumer and Residential Mortgage Grading System Consumer and Residential Mortgage loans are graded as either Performing or Nonperforming. Nonperforming loans are loans that are 1) over 90 days past due and interest is still accruing, 2) on nonaccrual status or 3) restructured. All loans not meeting any of these three criteria are considered Performing. The following tables illustrate the Company’s credit quality by loan class as of September 30, 2015 and December 31, 2014: Credit Quality Indicators As of September 30, 2015 ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 600,507 $ 1,127,116 $ 32,759 $ 25,784 $ 1,786,166 Special Mention 18,395 28,718 1 6 47,120 Substandard 32,089 27,462 618 1,025 61,194 Doubtful - - 8 - 8 Total $ 650,991 $ 1,183,296 $ 33,386 $ 26,815 $ 1,894,488 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 387,378 $ 387,378 Classified 15,312 15,312 Total $ 402,690 $ 402,690 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,450,146 $ 467,842 $ 57,281 $ 1,975,269 Nonperforming 3,206 5,820 145 9,171 Total $ 1,453,352 $ 473,662 $ 57,426 $ 1,984,440 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 925,834 $ 925,834 Nonperforming 9,715 9,715 Total $ 935,549 $ 935,549 Credit Quality Indicators As of September 30, 2015 ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 66,770 $ 163,948 $ 230,718 Special Mention 939 5,780 6,719 Substandard 4,353 12,102 16,455 Total $ 72,062 $ 181,830 $ 253,892 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 47,310 $ 47,310 Classified 4,005 4,005 Total $ 51,315 $ 51,315 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 34,912 $ 67,311 $ 4,009 $ 106,232 Nonperforming 110 591 35 736 Total $ 35,022 $ 67,902 $ 4,044 $ 106,968 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 238,270 $ 238,270 Nonperforming 3,376 3,376 Total $ 241,646 $ 241,646 Credit Quality Indicators As of December 31, 2014 ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 570,884 $ 1,023,856 $ 30,481 $ 23,443 $ 1,648,664 Special Mention 6,022 17,341 275 42 23,680 Substandard 38,241 27,671 2,183 1,489 69,584 Doubtful - - 8 - 8 Total $ 615,147 $ 1,068,868 $ 32,947 $ 24,974 $ 1,741,936 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 379,445 $ 379,445 Classified 18,990 18,990 Total $ 398,435 $ 398,435 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,306,095 $ 485,463 $ 55,658 $ 1,847,216 Nonperforming 3,955 7,417 136 11,508 Total $ 1,310,050 $ 492,880 $ 55,794 $ 1,858,724 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 838,816 $ 838,816 Nonperforming 10,026 10,026 Total $ 848,842 $ 848,842 Credit Quality Indicators As of December 31, 2014 ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 63,630 $ 186,036 $ 249,666 Special Mention 2,840 2,646 5,486 Substandard 8,794 11,206 20,000 Total $ 75,264 $ 199,888 $ 275,152 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 53,264 $ 53,264 Classified 4,915 4,915 Total $ 58,179 $ 58,179 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 65,063 $ 76,154 $ 5,277 $ 146,494 Nonperforming 160 562 40 762 Total $ 65,223 $ 76,716 $ 5,317 $ 147,256 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 262,883 $ 262,883 Nonperforming 3,864 3,864 Total $ 266,747 $ 266,747 Troubled Debt Restructured Loans The Company’s loan portfolio includes certain loans that have been modified where economic concessions have been granted to borrowers who have experienced or are expected to experience financial difficulties. These concessions typically result from the Company’s loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. Certain TDRs are classified as nonperforming at the time of restructure and may only be returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period, generally six months. Substantially all of these modifications included one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; temporary reduction in the interest rate; or change in principal. 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 through an allowance estimate or a charge-off to the allowance. 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 and nine months ended September 30, 2015 and 2014: Three months ended September 30, 2015 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 12 $ 863 $ 802 Residential Real Estate 16 1,293 1,191 Total Troubled Debt Restructurings 28 $ 2,156 $ 1,993 Three months ended September 30, 2014 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 1 $ 25 $ 24 Direct 7 225 163 Total Consumer 8 250 187 Residential Real Estate 3 179 161 Total Troubled Debt Restructurings 11 $ 429 $ 348 Nine months ended September 30, 2015 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Commercial 1 $ 1,250 $ 186 Small Business 1 220 173 Total Commercial 2 1,470 359 Consumer Home Equity 39 3,212 2,915 Direct 4 109 102 Total Consumer 43 3,321 3,017 Residential Real Estate 32 3,066 2,854 Total Troubled Debt Restructurings 77 $ 7,857 $ 6,230 Nine months ended September 30, 2014 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Small Business 2 $ 570 $ 558 Consumer Indirect 2 69 38 Home Equity 7 286 273 Direct 40 2,701 2,043 Total Consumer 49 3,056 2,354 Residential Real Estate 19 2,157 1,628 Total Troubled Debt Restructurings 70 $ 5,783 $ 4,540 The following table illustrates the recorded investment and number of modifications for TDRs within the three and nine months ended September 30, 2015 and 2014 where a concession has been made and subsequently defaulted during the period: Three months ended September 30, 2015 Three months ended September 30, 2014 Num

Defined Benefit Postretirement

Defined Benefit Postretirement Plans	9 Months Ended
	Sep. 30, 2015
Defined Benefit Postretirement Plans [Abstract]
Defined Benefit Postretirement Plans	Note 5. Defined Benefit Postretirement Plans The Company has a qualified, noncontributory, defined benefit pension plan (“the Plan”) covering substantially all of its employees at September 30, 2015. Benefits paid from the plan are based on age, years of service, compensation and 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 (“ERISA”) standards. Assets of the plan are invested in publicly traded stocks and bonds. The Company is not required to make contributions to the Plan in 2015 and did not do so during the nine months ended September 30, 2015. Market conditions can result in an unusually high degree of volatility and increase the risks and short term liquidity associated with certain investments held by the Plan which could impact the value of these investments. In addition to the Plan, the Company also provides supplemental employee retirement plans to certain current and former executives. 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. These postretirement benefits are referred to herein as “Other Benefits.” The components of expense for Pension Benefits and Other Benefits are set forth below (in thousands): Pension Benefits Other Benefits Three months ended September 30, Three months ended September 30, Components of net periodic (benefit) cost: 2015 2014 2015 2014 Service cost $ 669 $ 587 $ 4 $ 4 Interest cost 996 1,040 101 90 Expected return on plan assets (2,147 ) (2,175 ) - - Net amortization 550 25 1 (6 ) Total cost (benefit) $ 68 $ (523 ) $ 106 $ 88 Pension Benefits Other Benefits Nine months ended September 30, Nine months ended September 30, Components of net periodic (benefit) cost: 2015 2014 2015 2014 Service cost $ 1,979 $ 1,761 $ 12 $ 12 Interest cost 2,992 3,120 283 270 Expected return on plan assets (6,447 ) (6,525 ) - - Net amortization 1,642 75 31 (18 ) Total cost (benefit) $ 166 $ (1,569 ) $ 326 $ 264

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Note 6. Earnings Per Share Basic earnings per share is computed by dividing income available to common shareholders by the weighted average number of common shares outstanding for the period, excluding shares issuable upon the exercise of certain contracts to issue common stock, such as in-the-money stock options. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as the Company’s dilutive stock options and restricted stock units). The following is a reconciliation of basic and diluted earnings per share for the periods presented in the consolidated statements of income. Three months ended September 30, 2015 2014 (in thousands, except per share data) Basic EPS: Weighted average common shares outstanding 43,692 43,882 Net income 19,851 10,912 Basic EPS $ 0.45 $ 0.25 Diluted EPS: Weighted average common shares outstanding 43,692 43,882 Dilutive effect of common stock options and restricted stock 570 523 Weighted average common shares and common share equivalents 44,262 44,405 Net income 19,851 10,912 Diluted EPS $ 0.45 $ 0.25 Nine months ended September 30, 2015 2014 (in thousands, except per share data) Basic EPS: Weighted average common shares outstanding 43,949 43,847 Net income 57,298 56,561 Basic EPS $ 1.30 $ 1.29 Diluted EPS: Weighted average common shares outstanding 43,949 43,847 Dilutive effect of common stock options and restricted stock 519 507 Weighted average common shares and common share equivalents 44,468 44,354 Net income 57,298 56,561 Diluted EPS $ 1.29 $ 1.28 There were 36,360 stock options for the quarter ended September 30, 2015 and 501,843 stock options for the quarter ended September 30, 2014 that were not considered in the calculation of diluted earnings per share since the stock options’ exercise price was greater than the average market price during these periods. There were 334,759 stock options for the nine months ended September 30, 2015 and 502,836 stock options for the nine months ended September 30, 2014 that were not considered in the calculation of diluted earnings per share 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)	9 Months Ended
	Sep. 30, 2015
Reclassification Adjustments Out of Other Comprehensive Income (Loss) [Abstract]
Reclassification Adjustments Out of Other Comprehensive Income (Loss)	Note 7. Reclassification Adjustments Out of Other Comprehensive Income (Loss) The following table summarizes the reclassification adjustments out of accumulated other comprehensive income (loss) (in thousands): Detail About Accumulated Other Comprehensive Income (Loss) Components Amount reclassified from accumulated other comprehensive income (loss) Affected line item in the consolidated statement of comprehensive income (loss) Three months ended September 30, 2015 September 30, 2014 Securities: Gains on available for sale securities $ (3 ) $ (38 ) Net securities (gains) losses Amortization of unrealized gains and losses related to securities transfer 328 (99 ) Interest income Tax (benefit) expense (127 ) 55 Income tax expense Net of tax $ 198 $ (82 ) Pension and other benefits: Amortization of net gains $ 566 $ 74 Salaries and employee benefits Amortization of prior service costs (15 ) (55 ) Salaries and employee benefits Tax benefit (214 ) (8 ) Income tax expense Net of tax $ 337 $ 11 Total reclassifications during the period, net of tax $ 535 $ (71 ) Detail About Accumulated Other Comprehensive Income (Loss) Components Amount reclassified from accumulated other comprehensive income (loss) Affected line item in the consolidated statement of comprehensive income (loss) Nine months ended September 30, 2015 September 30, 2014 Securities: Gains on available for sale securities $ (43 ) $ (59 ) Net securities gains Amortization of unrealized gains and losses related to securities transfer 999 (99 ) Interest income Tax (benefit) expense (372 ) 64 Income tax expense Net of tax $ 584 $ (94 ) Pension and other benefits: Amortization of net gains $ 1,697 $ 222 Salaries and employee benefits Amortization of prior service costs (24 ) (165 ) Salaries and employee benefits Tax benefit (652 ) (23 ) Income tax expense Net of tax $ 1,021 $ 34 Total reclassifications during the period, net of tax $ 1,605 $ (60 )

Fair Value Measurements and Fai

Fair Value Measurements and Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2015
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value Measurements and Fair Value of Financial Instruments	Note 8. Fair Value Measurements and Fair Value of Financial Instruments U.S. 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 (i.e., supported by little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within level 1 or level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments. The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations, and certain physical commodities. Such instruments are generally classified within level 2 of the fair value hierarchy. 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 relies on both internal and external support on certain Level 3 investments. 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 nine month period ending September 30, 2015, the Company has made no transfers of assets between Level 1 and Level 2, and has had no Level 3 activity. The following tables set forth the Company’s financial assets and liabilities measured on a recurring basis that were accounted for at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement (in thousands): September 30, 2015: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balance as of September 30, 2015 Assets: Securities Available for Sale: Federal Agency - 343,263 - 343,263 State & municipal - 33,647 - 33,647 Mortgage-backed - 335,810 - 335,810 Collateralized mortgage obligations - 330,346 - 330,346 Other securities 7,422 7,909 - 15,331 Total Securities Available for Sale $ 7,422 $ 1,050,975 $ - $ 1,058,397 Trading Securities 7,900 - - 7,900 Interest Rate Swaps - 8,707 - 8,707 Total $ 15,322 $ 1,059,682 $ - $ 1,075,004 Liabilities: Interest Rate Swaps $ - $ 8,707 $ - $ 8,707 Total $ - $ 8,707 $ - $ 8,707 December 31, 2014: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balance as of December 31, 2014 Assets: Securities Available for Sale: U.S. Treasury $ 23,111 $ - $ - $ 23,111 Federal Agency - 329,914 - 329,914 State & municipal - 37,570 - 37,570 Mortgage-backed - 364,727 - 364,727 Collateralized mortgage obligations - 242,129 - 242,129 Other securities 7,612 8,108 - 15,720 Total Securities Available for Sale $ 30,723 $ 982,448 $ - $ 1,013,171 Trading Securities 7,793 - - 7,793 Interest Rate Swaps - 4,707 - 4,707 Total $ 38,516 $ 987,155 $ - $ 1,025,671 Liabilities: Interest Rate Swaps $ - $ 4,707 $ - $ 4,707 Total $ - $ 4,707 $ - $ 4,707 Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). The majority of the other investment securities are reported at fair value utilizing Level 2 inputs. 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. U.S. 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 nine month period ended September 30, 2015 were related to impaired loans and other real estate owned, which were immaterial. For the nine month periods ending September 30, 2015 and September 30, 2014, the Company had $9.9 million and $8.8 million, respectively, of loans recorded at fair value resulting in specific allowance reserves of $3.5 million and $3.6 million, respectively. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the specific reserves for collateral dependent impaired loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%. Based on the valuation techniques used, the fair value measurements for collateral dependent impaired loans are classified as Level 3. The following table sets forth information with regard to estimated fair values of financial instruments at September 30, 2015 and December 31, 2014. 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. September 30, 2015 December 31, 2014 (In thousands) Fair Value Hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value Financial assets Securities held to maturity 2 $ 470,758 $ 475,436 $ 454,361 $ 454,994 Net loans 3 5,806,129 5,957,554 5,528,912 5,584,777 Financial liabilities Time deposits 2 $ 931,966 $ 929,477 $ 1,043,823 $ 1,038,877 Long-term debt 2 130,635 132,849 130,945 132,562 Junior subordinated debt 2 101,196 91,396 101,196 103,770 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 that applies prevailing market interest rates for similar maturity instruments.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Note 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 $1.3 billion at September 30, 2015 and $1.2 billion at December 31, 2014. 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 $32.4 million at September 30, 2015 and $35.2 million at December 31, 2014. As of September 30, 2015, the fair value of standby letters of credit was not significant to the Company’s consolidated financial statements. The Company has also entered into commercial letter of credit agreements on behalf of its customers. Under these agreements, the Company, on the request of its customer, opens the letter of credit and makes a commitment to honor draws made under the agreement, whereby the beneficiary is normally the provider of goods and/or services and the Company essentially replaces the customer as the payee. The credit risk involved in issuing commercial 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 agreements vary in terms and the total amounts do not necessarily represent future cash commitments. Commercial letters of credit totaled $5.3 million at September 30, 2015 and $22.5 million at December 31, 2014. As of September 30, 2015, the fair value of commercial letters of credit was not significant to the Company’s consolidated financial statements.

Description of Business (Polici

Description of Business (Policies)	9 Months Ended
	Sep. 30, 2015
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, northwestern Vermont, western Massachusetts, southern New Hampshire, and southern Maine. 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)	9 Months Ended
	Sep. 30, 2015
Securities [Abstract]
Investment, Policy	Management has the intent to hold the securities classified as held to maturity until they mature, at which time it is believed the Company will receive full value for the securities. Furthermore, as of September 30, 2015, management also has the intent to hold, and will not be required to sell, the securities classified as available for sale for a period of time sufficient for a recovery of cost, which may be until maturity. The unrealized losses 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 fair value is expected to recover as the bonds approach their maturity date or repricing date or if market yields for such investments decline. As of September 30, 2015, management believes the impairments detailed in the table above are temporary and no other-than-temporary impairment losses have been realized in the Company’s consolidated statements of income.

Allowance for Loan Losses and21

Allowance for Loan Losses and Credit Quality of Loans (Policies)	9 Months Ended
	Sep. 30, 2015
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Portfolio and Class Segments	The following table illustrates the portfolio and class segments for the Company’s loan portfolio: Portfolio Class Commercial Loans Commercial Commercial Real Estate Agricultural Agricultural Real Estate Business Banking Consumer Loans Indirect Home Equity Direct Residential Real Estate Mortgages
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is maintained at a level estimated by management to provide adequately for probable incurred losses inherent in the current loan portfolio. The adequacy of the allowance for loan losses is continuously monitored. It is assessed for adequacy using a methodology designed to ensure the level of the allowance reasonably reflects the loan portfolio’s risk profile. It is evaluated to ensure that it is sufficient to absorb all reasonably estimable credit losses inherent in the current loan portfolio. To develop and document a systematic methodology for determining the allowance for loan losses, the Company has divided the loan portfolio into three segments, each with different risk characteristics and methodologies for assessing risk. Those segments are further segregated between our loans accounted for under the amortized cost method (referred to as “originated” loans) and loans acquired in a business combination (referred to as “acquired” loans). Each portfolio segment is broken down into class segments where appropriate. Class segments contain unique measurement attributes, risk characteristics and methods for monitoring and assessing risk that are necessary to develop the allowance for loan losses. Unique characteristics such as borrower type, loan type, collateral type, and risk characteristics define each class segment. The following table illustrates the portfolio and class segments for the Company’s loan portfolio: Portfolio Class Commercial Loans Commercial Commercial Real Estate Agricultural Agricultural Real Estate Business Banking Consumer Loans Indirect Home Equity Direct Residential Real Estate Mortgages Commercial Loans The Company offers a variety of commercial loan products including commercial (non-real estate), commercial real estate, agricultural, agricultural real estate, and business banking loans. The Company’s underwriting analysis for commercial loans typically includes credit verification, independent appraisals, a review of the borrower’s financial condition, and a detailed analysis of the borrower’s underlying cash flows. Commercial (non-Real Estate) – Commercial Real Estate – Agricultural Agricultural Real Estate Business Banking - Consumer Loans The Company offers a variety of consumer loan products including indirect, home equity, and direct loans. Indirect – Home Equity Direct – Residential Real Estate Mortgages Residential real estate loans consist primarily of loans secured by first or second deeds of trust on primary residences. We originate adjustable-rate and fixed-rate, one-to-four-family residential real estate loans for the construction, purchase or refinancing of a residential mortgage. These loans are collateralized by owner-occupied properties located in the Company’s market area. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower), or have private mortgage insurance. The Company’s underwriting analysis for residential mortgage loans typically includes credit verification, independent appraisals, and a review of the borrower’s financial condition. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. For purposes of evaluating the adequacy of the allowance, the Company considers a number of significant factors that affect the collectability of the portfolio. For individually analyzed loans, these include estimates of loss exposure, which reflect the facts and circumstances that affect the likelihood of repayment of such loans as of the evaluation date. For homogeneous pools of loans, estimates of the Company’s exposure to credit loss reflect a current assessment of a number of factors, which could affect collectability. These factors include: past loss experience; size, trend, composition, and nature of loans; changes in lending policies and procedures, including underwriting standards and collection, charge-offs and recoveries; trends experienced in nonperforming and delinquent loans; current economic conditions in the Company’s market; portfolio concentrations that may affect loss experienced across one or more components of the portfolio; the effect of external factors such as competition, legal and regulatory requirements; and the experience, ability, and depth of lending management and staff. In addition, various regulatory agencies, as an integral component of their examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to make loan grade changes as well as recognize additions to the allowance based on their examinations. After a thorough consideration of the factors discussed above, any required additions or reductions to the allowance for loan losses are made periodically by charges or credits to the provision for loan losses. These charges or credits are necessary to maintain the allowance at a level which management believes is reasonably 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 The Company’s loan portfolio includes certain loans that have been modified where economic concessions have been granted to borrowers who have experienced or are expected to experience financial difficulties. These concessions typically result from the Company’s loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. Certain TDRs are classified as nonperforming at the time of restructure and may only be returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period, generally six months. Substantially all of these modifications included one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; temporary reduction in the interest rate; or change in principal. 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 through an allowance estimate or a charge-off to the allowance.

Defined Benefit Postretiremen22

Defined Benefit Postretirement Plans (Policies)	9 Months Ended
	Sep. 30, 2015
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 September 30, 2015. Benefits paid from the plan are based on age, years of service, compensation and 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 (“ERISA”) standards. Assets of the plan are invested in publicly traded stocks and bonds. The Company is not required to make contributions to the Plan in 2015 and did not do so during the nine months ended September 30, 2015. Market conditions can result in an unusually high degree of volatility and increase the risks and short term liquidity associated with certain investments held by the Plan which could impact the value of these investments. In addition to the Plan, the Company also provides supplemental employee retirement plans to certain current and former executives. 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. These postretirement benefits are referred to herein as “Other Benefits.”

Fair Value Measurements and F23

Fair Value Measurements and Fair Value of Financial Instruments (Policies)	9 Months Ended
	Sep. 30, 2015
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Instruments, Policy	U.S. 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 (i.e., supported by little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within level 1 or level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments. The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations, and certain physical commodities. Such instruments are generally classified within level 2 of the fair value hierarchy. 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 relies on both internal and external support on certain Level 3 investments. 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 nine month period ending September 30, 2015, the Company has made no transfers of assets between Level 1 and Level 2, and has had no Level 3 activity. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). The majority of the other investment securities are reported at fair value utilizing Level 2 inputs. 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. U.S. 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 nine month period ended September 30, 2015 were related to impaired loans and other real estate owned, which were immaterial. For the nine month periods ending September 30, 2015 and September 30, 2014, the Company had $9.9 million and $8.8 million, respectively, of loans recorded at fair value resulting in specific allowance reserves of $3.5 million and $3.6 million, respectively. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the specific reserves for collateral dependent impaired loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%. Based on the valuation techniques used, the fair value measurements for collateral dependent impaired loans are classified as Level 3. Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on and off balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, the Company has a substantial trust and investment management operation that contributes net fee income annually. The trust and investment management operation is not considered a financial instrument, and its value has not been incorporated into the fair value estimates. Other significant assets and liabilities include the benefits resulting from the low-cost funding of deposit liabilities as compared to the cost of borrowing funds in the market, and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimate of fair value. Securities Held to Maturity The fair value of the Company’s investment securities held to maturity is primarily measured using information from a third party pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Net Loans The fair value of the Company’s loans was estimated by discounting the expected future cash flows using the current interest rates at which similar loans would be made for the same remaining maturities. Loans were first segregated by type, and then further segmented into fixed and variable rate and loan quality categories. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments. Time Deposits The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value. Long-Term Debt The fair value of long-term debt was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. Junior Subordinated Debt The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis that applies prevailing market interest rates for similar maturity instruments.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2015
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 securities available for sale are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value September 30, 2015 Federal Agency $ 342,140 $ 1,245 $ (122 ) $ 343,263 State & municipal 33,140 510 (3 ) 33,647 Mortgage-backed: Government-sponsored enterprises 313,840 7,118 (105 ) 320,853 U.S. government agency securities 14,293 728 (64 ) 14,957 Collateralized mortgage obligations: Government-sponsored enterprises 296,005 2,638 (63 ) 298,580 U.S. government agency securities 31,302 485 (21 ) 31,766 Other securities 12,900 2,531 (100 ) 15,331 Total securities available for sale $ 1,043,620 $ 15,255 $ (478 ) $ 1,058,397 December 31, 2014 U.S. Treasury $ 23,041 $ 70 $ - $ 23,111 Federal Agency 332,193 327 (2,606 ) 329,914 State & municipal 37,035 587 (52 ) 37,570 Mortgage-backed: Government-sponsored enterprises 339,190 7,597 (224 ) 346,563 U.S. government agency securities 17,367 863 (66 ) 18,164 Collateralized mortgage obligations: Government-sponsored enterprises 199,837 1,828 (234 ) 201,431 U.S. government agency securities 40,237 497 (36 ) 40,698 Other securities 12,818 3,054 (152 ) 15,720 Total securities available for sale $ 1,001,718 $ 14,823 $ (3,370 ) $ 1,013,171
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 are as follows: (In thousands) Amortized cost Unrealized gains Unrealized losses Estimated fair value September 30, 2015 Mortgage-backed: Government-sponsored enterprises $ 9,782 $ - $ (25 ) $ 9,757 U.S. government agency securities 665 107 - 772 Collateralized mortgage obligations: Government-sponsored enterprises 282,966 4,081 (951 ) 286,096 State & municipal 177,345 1,509 (43 ) 178,811 Total securities held to maturity $ 470,758 $ 5,697 $ (1,019 ) $ 475,436 December 31, 2014 Mortgage-backed: Government-sponsored enterprises $ 755 $ 113 $ - $ 868 Collateralized mortgage obligations: Government-sponsored enterprises 317,628 1,934 (1,965 ) 317,597 State & municipal 135,978 674 (123 ) 136,529 Total securities held to maturity $ 454,361 $ 2,721 $ (2,088 ) $ 454,994
Investment Securities with Unrealized Losses	The following table sets forth information with regard to investment securities with unrealized losses for the periods presented: 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 September 30, 2015 Investment securities available for sale: Federal agency $ 19,962 $ (30 ) 2 $ 29,908 $ (92 ) 3 $ 49,870 $ (122 ) 5 State & municipal 2,957 (3 ) 4 - - - 2,957 (3 ) 4 Mortgage-backed 11,656 (109 ) 14 4,319 (60 ) 16 15,975 (169 ) 30 Collateralized mortgage obligations 29,608 (62 ) 5 4,340 (22 ) 3 33,948 (84 ) 8 Other securities - - - 3,931 (100 ) 3 3,931 (100 ) 3 Total securities with unrealized losses $ 64,183 $ (204 ) 25 $ 42,498 $ (274 ) 25 $ 106,681 $ (478 ) 50 September 30, 2015 Investment securities held to maturity: Mortgage-backed $ 9,757 $ (25 ) 1 $ - $ - - $ 9,757 $ (25 ) 1 Collateralized mortgage obligations - - - 43,127 (951 ) 4 43,127 (951 ) 4 State & municipal 6,313 (43 ) 11 - - - 6,313 (43 ) 11 Total securities with unrealized losses $ 16,070 $ (68 ) 12 $ 43,127 $ (951 ) 4 $ 59,197 $ (1,019 ) 16 December 31, 2014 Investment securities available for sale: Federal agency $ 66,528 $ (226 ) 8 $ 198,151 $ (2,380 ) 16 $ 264,679 $ (2,606 ) 24 State & municipal 8,818 (42 ) 33 1,321 (10 ) 5 10,139 (52 ) 38 Mortgage-backed 10,400 (36 ) 10 35,565 (254 ) 31 45,965 (290 ) 41 Collateralized mortgage obligations 57,682 (196 ) 8 6,598 (74 ) 4 64,280 (270 ) 12 Other securities - - - 3,201 (152 ) 2 3,201 (152 ) 2 Total securities with unrealized losses $ 143,428 $ (500 ) 59 $ 244,836 $ (2,870 ) 58 $ 388,264 $ (3,370 ) 117 December 31, 2014 Investment securities held to maturity: Collateralized mortgage obligations $ 26,052 $ (49 ) 2 $ 46,415 $ (1,916 ) 4 $ 72,467 $ (1,965 ) 6 State & municipal 43,514 (116 ) 110 1,619 (7 ) 6 45,133 (123 ) 116 Total securities with unrealized losses $ 69,566 $ (165 ) 112 $ 48,034 $ (1,923 ) 10 $ 117,600 $ (2,088 ) 122
Contractual Maturities of Debt Securities	The following tables set forth information with regard to contractual maturities of debt securities at September 30, 2015: (In thousands) Amortized cost Estimated fair value Debt securities classified as available for sale Within one year $ 4,031 $ 4,058 From one to five years 369,188 371,294 From five to ten years 137,908 140,701 After ten years 519,593 527,013 $ 1,030,720 $ 1,043,066 Debt securities classified as held to maturity Within one year $ 42,420 $ 42,427 From one to five years 15,186 15,260 From five to ten years 107,816 109,043 After ten years 305,336 308,706 $ 470,758 $ 475,436

Allowance for Loan Losses and25

Allowance for Loan Losses and Credit Quality of Loans (Tables)	9 Months Ended
	Sep. 30, 2015
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 and nine months ended September 30, 2015 and 2014: Three months ended September 30, Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of June 30, 2015 $ 28,326 $ 28,314 $ 8,281 $ 38 $ 64,959 Charge-offs (1,333 ) (4,530 ) (511 ) - (6,374 ) Recoveries 258 889 161 - 1,308 Provision (2,800 ) 7,333 51 382 4,966 Ending Balance as of September 30, 2015 $ 24,451 $ 32,006 $ 7,982 $ 420 $ 64,859 Balance as of June 30, 2014 $ 35,123 $ 27,973 $ 6,205 $ 233 $ 69,534 Charge-offs (1,517 ) (3,979 ) (481 ) - (5,977 ) Recoveries 253 632 7 - 892 Provision 1,779 2,826 212 68 4,885 Ending Balance as of September 30, 2014 $ 35,638 $ 27,452 $ 5,943 $ 301 $ 69,334 Nine months ended September 30, Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total Balance as of December 31, 2014 $ 32,433 $ 26,720 $ 7,130 $ 76 $ 66,359 Charge-offs (2,715 ) (13,183 ) (1,524 ) - (17,422 ) Recoveries 772 2,334 310 - 3,416 Provision (6,039 ) 16,135 2,066 344 12,506 Ending Balance as of September 30, 2015 $ 24,451 $ 32,006 $ 7,982 $ 420 $ 64,859 Balance as of December 31, 2013 $ 35,090 $ 27,694 $ 6,520 $ 130 $ 69,434 Charge-offs (3,423 ) (11,659 ) (965 ) - (16,047 ) Recoveries 966 2,087 247 - 3,300 Provision 3,005 9,330 141 171 12,647 Ending Balance as of September 30, 2014 $ 35,638 $ 27,452 $ 5,943 $ 301 $ 69,334 The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments as of September 30, 2015 and December 31, 2014: Allowance for Loan Losses and Recorded Investment in Loans (in thousands) Commercial Loans Consumer Loans Residential Real Estate Mortgages Unallocated Total As of September 30, 2015 Allowance for loan losses $ 24,451 $ 32,006 $ 7,982 $ 420 $ 64,859 Allowance for loans individually evaluated for impairment 3,545 - - 3,545 Allowance for loans collectively evaluated for impairment $ 20,906 $ 32,006 $ 7,982 $ 420 $ 61,314 Ending balance of loans $ 2,602,385 $ 2,091,408 $ 1,177,195 $ 5,870,988 Ending balance of originated loans individually evaluated for impairment 12,559 7,590 5,867 26,016 Ending balance of acquired loans individually evaluated for impairment 9,317 - - 9,317 Ending balance of acquired loans collectively evaluated for impairment 295,890 106,968 241,646 644,504 Ending balance of originated loans collectively evaluated for impairment $ 2,284,619 $ 1,976,850 $ 929,682 $ 5,191,151 As of December 31, 2014 Allowance for loan losses $ 32,433 $ 26,720 $ 7,130 $ 76 $ 66,359 Allowance for loans individually evaluated for impairment 1,100 - - 1,100 Allowance for loans collectively evaluated for impairment $ 31,333 $ 26,720 $ 7,130 $ 76 $ 65,259 Ending balance of loans $ 2,473,702 $ 2,005,980 $ 1,115,589 $ 5,595,271 Ending balance of originated loans individually evaluated for impairment 11,079 5,498 3,544 20,121 Ending balance of acquired loans individually evaluated for impairment 5,675 - - 5,675 Ending balance of acquired loans collectively evaluated for impairment 327,656 147,256 266,747 741,659 Ending balance of originated loans collectively evaluated for impairment $ 2,129,292 $ 1,853,226 $ 845,298 $ 4,827,816
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 September 30, 2015 and December 31, 2014: Age Analysis of Past Due Financing Receivables As of September 30, 2015 (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 Non-Accrual Current Recorded Total Loans ORIGINATED Commercial Loans Commercial $ 2,050 $ 100 $ - $ 2,150 $ 1,264 $ 647,577 $ 650,991 Commercial Real Estate 537 - - 537 6,236 1,176,523 1,183,296 Agricultural - - - - 900 32,486 33,386 Agricultural Real Estate 557 - - 557 500 25,758 26,815 Business Banking 1,930 145 - 2,075 4,947 395,668 402,690 5,074 245 - 5,319 13,847 2,278,012 2,297,178 Consumer Loans Indirect 15,041 3,159 1,488 19,688 1,718 1,431,946 1,453,352 Home Equity 4,091 1,205 384 5,680 5,436 462,546 473,662 Direct 526 99 59 684 86 56,656 57,426 19,658 4,463 1,931 26,052 7,240 1,951,148 1,984,440 Residential Real Estate Mortgages 2,312 80 1,253 3,645 8,462 923,442 935,549 $ 27,044 $ 4,788 $ 3,184 $ 35,016 $ 29,549 $ 5,152,602 $ 5,217,167 ACQUIRED Commercial Loans Commercial $ - $ - $ - $ - $ 2,509 $ 69,553 $ 72,062 Commercial Real Estate - - - - 6,804 175,026 181,830 Business Banking 63 19 12 94 144 51,077 51,315 63 19 12 94 9,457 295,656 305,207 Consumer Loans Indirect 219 70 14 303 96 34,623 35,022 Home Equity 177 70 - 247 591 67,064 67,902 Direct 24 23 1 48 34 3,962 4,044 420 163 15 598 721 105,649 106,968 Residential Real Estate Mortgages 863 41 579 1,483 2,797 237,366 241,646 $ 1,346 $ 223 $ 606 $ 2,175 $ 12,975 $ 638,671 $ 653,821 Total Loans $ 28,390 $ 5,011 $ 3,790 $ 37,191 $ 42,524 $ 5,791,273 $ 5,870,988 Age Analysis of Past Due Financing Receivables As of December 31, 2014 (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 Non-Accrual Current Recorded Total Loans ORIGINATED Commercial Loans Commercial $ - $ 735 $ - $ 735 $ 1,012 $ 613,400 $ 615,147 Commercial Real Estate 192 - - 192 4,127 1,064,549 1,068,868 Agricultural - - - - 817 32,130 32,947 Agricultural Real Estate 19 - - 19 565 24,390 24,974 Business Banking 799 235 84 1,118 6,910 390,407 398,435 1,010 970 84 2,064 13,431 2,124,876 2,140,371 Consumer Loans Indirect 16,434 3,154 1,991 21,579 1,964 1,286,507 1,310,050 Home Equity 4,591 1,428 821 6,840 6,596 479,444 492,880 Direct 560 157 52 769 84 54,941 55,794 21,585 4,739 2,864 29,188 8,644 1,820,892 1,858,724 Residential Real Estate Mortgages 2,901 96 1,256 4,253 8,770 835,819 848,842 $ 25,496 $ 5,805 $ 4,204 $ 35,505 $ 30,845 $ 4,781,587 $ 4,847,937 ACQUIRED Commercial Loans Commercial $ - $ - $ - $ - $ 3,009 $ 72,255 $ 75,264 Commercial Real Estate - - - - 2,666 197,222 199,888 Business Banking 5 15 - 20 665 57,494 58,179 5 15 - 20 6,340 326,971 333,331 Consumer Loans Indirect 518 5 54 577 106 64,540 65,223 Home Equity 190 60 5 255 557 75,904 76,716 Direct 31 - 7 38 33 5,246 5,317 739 65 66 870 696 145,690 147,256 Residential Real Estate Mortgages 1,162 265 671 2,098 3,193 261,456 266,747 $ 1,906 $ 345 $ 737 $ 2,988 $ 10,229 $ 734,117 $ 747,334 Total Loans $ 27,402 $ 6,150 $ 4,941 $ 38,493 $ 41,074 $ 5,515,704 $ 5,595,271
Impaired Loans and Specific Reserve Allocations	The following table provides information on loans specifically evaluated for impairment as of September 30, 2015 and December 31, 2014: September 30, 2015 December 31, 2014 (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 $ 1,694 $ 1,846 $ 1,748 $ 1,901 Commercial Real Estate 3,187 3,198 4,505 4,520 Agricultural 19 25 20 26 Agricultural Real Estate 623 749 1,147 1,441 Business Banking 995 1,037 896 1,301 Total Commercial Loans 6,518 6,855 8,316 9,189 Consumer Loans Indirect 13 23 - - Home Equity 7,577 8,380 5,498 6,033 Direct - - - - Total Consumer Loans 7,590 8,403 5,498 6,033 Residential Real Estate Mortgages 5,867 6,386 3,544 3,959 Total 19,975 21,644 17,358 19,181 With an allowance recorded: Commercial Loans Commercial 948 953 300 - - - Commercial Real Estate 5,093 6,959 1,395 2,763 4,611 600 Total Commercial Loans 6,041 7,912 1,695 2,763 4,611 600 ACQUIRED With no related allowance recorded: Commercial Loans Commercial Real Estate 5,488 5,789 2,666 3,830 With an allowance recorded: Commercial Loans Commercial 2,508 4,668 1,000 3,009 4,668 500 Commercial Real Estate 1,321 1,321 850 - - - Total Commercial Loans 3,829 5,989 1,850 3,009 4,668 500 Total: $ 35,333 $ 41,334 $ 3,545 $ 25,796 $ 32,290 $ 1,100 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 September 30, 2015 and 2014: For the three months ended September 30, 2015 September 30, 2014 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans Commercial $ 2,469 $ 42 $ 1,957 $ - Commercial Real Estate 8,560 42 9,619 43 Agricultural 19 - 102 - Agricultural Real Estate 626 11 1,395 12 Business Banking 1,003 3 677 10 Consumer Loans Indirect 20 - - - Home Equity 7,432 134 5,435 85 Direct - - - - Residential Real Estate Mortgage 5,564 37 2,961 29 Total Originated $ 25,693 $ 269 $ 22,146 $ 179 ACQUIRED Commercial Loans Commercial 2,531 - 6,161 - Commercial Real Estate 6,918 - 3,398 - Total Acquired $ 9,449 $ - $ 9,559 $ - Total Loans $ 35,142 $ 269 $ 31,705 $ 179 For the nine months ended September 30, 2015 September 30, 2014 (in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized ORIGINATED Commercial Loans Commercial $ 2,026 $ 128 $ 2,001 $ - Commercial Real Estate 8,884 124 10,400 127 Agricultural 19 1 115 1 Agricultural Real Estate 630 34 1,410 35 Business Banking 952 9 509 33 Consumer Loans Indirect 14 - - - Home Equity 6,869 298 5,099 188 Direct 1 - - - Residential Real Estate Mortgage 4,857 100 2,864 79 Total Originated $ 24,252 $ 694 $ 22,398 $ 463 ACQUIRED Commercial Loans Commercial 2,658 - 6,303 - Commercial Real Estate 7,070 - 3,461 - Total Acquired $ 9,728 $ - $ 9,764 $ - Total Loans $ 33,980 $ 694 $ 32,162 $ 463
Financing Receivable Credit Quality by Loan Class	The following tables illustrate the Company’s credit quality by loan class as of September 30, 2015 and December 31, 2014: Credit Quality Indicators As of September 30, 2015 ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 600,507 $ 1,127,116 $ 32,759 $ 25,784 $ 1,786,166 Special Mention 18,395 28,718 1 6 47,120 Substandard 32,089 27,462 618 1,025 61,194 Doubtful - - 8 - 8 Total $ 650,991 $ 1,183,296 $ 33,386 $ 26,815 $ 1,894,488 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 387,378 $ 387,378 Classified 15,312 15,312 Total $ 402,690 $ 402,690 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,450,146 $ 467,842 $ 57,281 $ 1,975,269 Nonperforming 3,206 5,820 145 9,171 Total $ 1,453,352 $ 473,662 $ 57,426 $ 1,984,440 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 925,834 $ 925,834 Nonperforming 9,715 9,715 Total $ 935,549 $ 935,549 Credit Quality Indicators As of September 30, 2015 ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 66,770 $ 163,948 $ 230,718 Special Mention 939 5,780 6,719 Substandard 4,353 12,102 16,455 Total $ 72,062 $ 181,830 $ 253,892 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 47,310 $ 47,310 Classified 4,005 4,005 Total $ 51,315 $ 51,315 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 34,912 $ 67,311 $ 4,009 $ 106,232 Nonperforming 110 591 35 736 Total $ 35,022 $ 67,902 $ 4,044 $ 106,968 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 238,270 $ 238,270 Nonperforming 3,376 3,376 Total $ 241,646 $ 241,646 Credit Quality Indicators As of December 31, 2014 ORIGINATED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Agricultural Agricultural Real Estate Total Pass $ 570,884 $ 1,023,856 $ 30,481 $ 23,443 $ 1,648,664 Special Mention 6,022 17,341 275 42 23,680 Substandard 38,241 27,671 2,183 1,489 69,584 Doubtful - - 8 - 8 Total $ 615,147 $ 1,068,868 $ 32,947 $ 24,974 $ 1,741,936 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 379,445 $ 379,445 Classified 18,990 18,990 Total $ 398,435 $ 398,435 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 1,306,095 $ 485,463 $ 55,658 $ 1,847,216 Nonperforming 3,955 7,417 136 11,508 Total $ 1,310,050 $ 492,880 $ 55,794 $ 1,858,724 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 838,816 $ 838,816 Nonperforming 10,026 10,026 Total $ 848,842 $ 848,842 Credit Quality Indicators As of December 31, 2014 ACQUIRED Commercial Credit Exposure By Internally Assigned Grade: Commercial Commercial Real Estate Total Pass $ 63,630 $ 186,036 $ 249,666 Special Mention 2,840 2,646 5,486 Substandard 8,794 11,206 20,000 Total $ 75,264 $ 199,888 $ 275,152 Business Banking Credit Exposure By Internally Assigned Grade: Business Banking Total Non-classified $ 53,264 $ 53,264 Classified 4,915 4,915 Total $ 58,179 $ 58,179 Consumer Credit Exposure By Payment Activity: Indirect Home Equity Direct Total Performing $ 65,063 $ 76,154 $ 5,277 $ 146,494 Nonperforming 160 562 40 762 Total $ 65,223 $ 76,716 $ 5,317 $ 147,256 Residential Mortgage Credit Exposure By Payment Activity: Residential Mortgage Total Performing $ 262,883 $ 262,883 Nonperforming 3,864 3,864 Total $ 266,747 $ 266,747
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 and nine months ended September 30, 2015 and 2014: Three months ended September 30, 2015 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 12 $ 863 $ 802 Residential Real Estate 16 1,293 1,191 Total Troubled Debt Restructurings 28 $ 2,156 $ 1,993 Three months ended September 30, 2014 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Consumer Home Equity 1 $ 25 $ 24 Direct 7 225 163 Total Consumer 8 250 187 Residential Real Estate 3 179 161 Total Troubled Debt Restructurings 11 $ 429 $ 348 Nine months ended September 30, 2015 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Commercial 1 $ 1,250 $ 186 Small Business 1 220 173 Total Commercial 2 1,470 359 Consumer Home Equity 39 3,212 2,915 Direct 4 109 102 Total Consumer 43 3,321 3,017 Residential Real Estate 32 3,066 2,854 Total Troubled Debt Restructurings 77 $ 7,857 $ 6,230 Nine months ended September 30, 2014 Number of contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial Small Business 2 $ 570 $ 558 Consumer Indirect 2 69 38 Home Equity 7 286 273 Direct 40 2,701 2,043 Total Consumer 49 3,056 2,354 Residential Real Estate 19 2,157 1,628 Total Troubled Debt Restructurings 70 $ 5,783 $ 4,540 The following table illustrates the recorded investment and number of modifications for TDRs within the three and nine months ended September 30, 2015 and 2014 where a concession has been made and subsequently defaulted during the period: Three months ended September 30, 2015 Three months ended September 30, 2014 Number of contracts Recorded Investment Number of contracts Recorded Investment Consumer Home Equity - $ - 1 $ 25 Residential Real Estate 2 174 1 48 Total Troubled Debt Restructurings 2 $ 174 2 $ 73 Nine months ended September 30, 2015 Nine months ended September 30, 2014 Number of contracts Recorded Investment Number of contracts Recorded Investment Consumer Home Equity 4 $ 344 7 $ 515 Residential Real Estate 2 174 - - Total Troubled Debt Restructurings 6 $ 518 7 $ 515

Defined Benefit Postretiremen26

Defined Benefit Postretirement Plans (Tables)	9 Months Ended
	Sep. 30, 2015
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 (in thousands): Pension Benefits Other Benefits Three months ended September 30, Three months ended September 30, Components of net periodic (benefit) cost: 2015 2014 2015 2014 Service cost $ 669 $ 587 $ 4 $ 4 Interest cost 996 1,040 101 90 Expected return on plan assets (2,147 ) (2,175 ) - - Net amortization 550 25 1 (6 ) Total cost (benefit) $ 68 $ (523 ) $ 106 $ 88 Pension Benefits Other Benefits Nine months ended September 30, Nine months ended September 30, Components of net periodic (benefit) cost: 2015 2014 2015 2014 Service cost $ 1,979 $ 1,761 $ 12 $ 12 Interest cost 2,992 3,120 283 270 Expected return on plan assets (6,447 ) (6,525 ) - - Net amortization 1,642 75 31 (18 ) Total cost (benefit) $ 166 $ (1,569 ) $ 326 $ 264

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings per Share	The following is a reconciliation of basic and diluted earnings per share for the periods presented in the consolidated statements of income. Three months ended September 30, 2015 2014 (in thousands, except per share data) Basic EPS: Weighted average common shares outstanding 43,692 43,882 Net income 19,851 10,912 Basic EPS $ 0.45 $ 0.25 Diluted EPS: Weighted average common shares outstanding 43,692 43,882 Dilutive effect of common stock options and restricted stock 570 523 Weighted average common shares and common share equivalents 44,262 44,405 Net income 19,851 10,912 Diluted EPS $ 0.45 $ 0.25 Nine months ended September 30, 2015 2014 (in thousands, except per share data) Basic EPS: Weighted average common shares outstanding 43,949 43,847 Net income 57,298 56,561 Basic EPS $ 1.30 $ 1.29 Diluted EPS: Weighted average common shares outstanding 43,949 43,847 Dilutive effect of common stock options and restricted stock 519 507 Weighted average common shares and common share equivalents 44,468 44,354 Net income 57,298 56,561 Diluted EPS $ 1.29 $ 1.28

Reclassification Adjustments 28

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2015
Reclassification Adjustments Out of Other Comprehensive Income (Loss) [Abstract]
Reclassification out of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the reclassification adjustments out of accumulated other comprehensive income (loss) (in thousands): Detail About Accumulated Other Comprehensive Income (Loss) Components Amount reclassified from accumulated other comprehensive income (loss) Affected line item in the consolidated statement of comprehensive income (loss) Three months ended September 30, 2015 September 30, 2014 Securities: Gains on available for sale securities $ (3 ) $ (38 ) Net securities (gains) losses Amortization of unrealized gains and losses related to securities transfer 328 (99 ) Interest income Tax (benefit) expense (127 ) 55 Income tax expense Net of tax $ 198 $ (82 ) Pension and other benefits: Amortization of net gains $ 566 $ 74 Salaries and employee benefits Amortization of prior service costs (15 ) (55 ) Salaries and employee benefits Tax benefit (214 ) (8 ) Income tax expense Net of tax $ 337 $ 11 Total reclassifications during the period, net of tax $ 535 $ (71 ) Detail About Accumulated Other Comprehensive Income (Loss) Components Amount reclassified from accumulated other comprehensive income (loss) Affected line item in the consolidated statement of comprehensive income (loss) Nine months ended September 30, 2015 September 30, 2014 Securities: Gains on available for sale securities $ (43 ) $ (59 ) Net securities gains Amortization of unrealized gains and losses related to securities transfer 999 (99 ) Interest income Tax (benefit) expense (372 ) 64 Income tax expense Net of tax $ 584 $ (94 ) Pension and other benefits: Amortization of net gains $ 1,697 $ 222 Salaries and employee benefits Amortization of prior service costs (24 ) (165 ) Salaries and employee benefits Tax benefit (652 ) (23 ) Income tax expense Net of tax $ 1,021 $ 34 Total reclassifications during the period, net of tax $ 1,605 $ (60 )

Fair Value Measurements and F29

Fair Value Measurements and Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis	The following tables set forth the Company’s financial assets and liabilities measured on a recurring basis that were accounted for at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement (in thousands): September 30, 2015: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balance as of September 30, 2015 Assets: Securities Available for Sale: Federal Agency - 343,263 - 343,263 State & municipal - 33,647 - 33,647 Mortgage-backed - 335,810 - 335,810 Collateralized mortgage obligations - 330,346 - 330,346 Other securities 7,422 7,909 - 15,331 Total Securities Available for Sale $ 7,422 $ 1,050,975 $ - $ 1,058,397 Trading Securities 7,900 - - 7,900 Interest Rate Swaps - 8,707 - 8,707 Total $ 15,322 $ 1,059,682 $ - $ 1,075,004 Liabilities: Interest Rate Swaps $ - $ 8,707 $ - $ 8,707 Total $ - $ 8,707 $ - $ 8,707 December 31, 2014: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balance as of December 31, 2014 Assets: Securities Available for Sale: U.S. Treasury $ 23,111 $ - $ - $ 23,111 Federal Agency - 329,914 - 329,914 State & municipal - 37,570 - 37,570 Mortgage-backed - 364,727 - 364,727 Collateralized mortgage obligations - 242,129 - 242,129 Other securities 7,612 8,108 - 15,720 Total Securities Available for Sale $ 30,723 $ 982,448 $ - $ 1,013,171 Trading Securities 7,793 - - 7,793 Interest Rate Swaps - 4,707 - 4,707 Total $ 38,516 $ 987,155 $ - $ 1,025,671 Liabilities: Interest Rate Swaps $ - $ 4,707 $ - $ 4,707 Total $ - $ 4,707 $ - $ 4,707
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 September 30, 2015 and December 31, 2014. 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. September 30, 2015 December 31, 2014 (In thousands) Fair Value Hierarchy Carrying amount Estimated fair value Carrying amount Estimated fair value Financial assets Securities held to maturity 2 $ 470,758 $ 475,436 $ 454,361 $ 454,994 Net loans 3 5,806,129 5,957,554 5,528,912 5,584,777 Financial liabilities Time deposits 2 $ 931,966 $ 929,477 $ 1,043,823 $ 1,038,877 Long-term debt 2 130,635 132,849 130,945 132,562 Junior subordinated debt 2 101,196 91,396 101,196 103,770

Securities (Details)

Securities (Details) $ in Thousands	Sep. 30, 2015USD ($)Position	Dec. 31, 2014USD ($)Position
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,043,620	$ 1,001,718
Unrealized gains	15,255	14,823
Unrealized losses	(478)	(3,370)
Estimated fair value	1,058,397	1,013,171
Amortized costs of securities available for sale pledged to secure public deposits	1,100,000	1,000,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements	174,800	208,800
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	64,183	143,428
12 Months or Longer, Fair Value	42,498	244,836
Total, Fair Value	106,681	388,264
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(204)	(500)
12 months or longer Unrealized Losses	(274)	(2,870)
Total Unrealized Losses	$ (478)	$ (3,370)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions | Position	25	59
12 Months or Longer, Number of Positions | Position	25	58
Total, Number of Positions | Position	50	117
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 470,758	$ 454,361
Unrealized gains	5,697	2,721
Unrealized losses	(1,019)	(2,088)
Estimated fair value	475,436	454,994
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	16,070	69,566
12 Months or Longer, Fair Value	43,127	48,034
Total, Fair Value	59,197	117,600
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	(68)	(165)
12 Months or Longer, Unrealized Losses	(951)	(1,923)
Total, Unrealized Losses	$ (1,019)	$ (2,088)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position	12	112
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position	4	10
Total, Number of Positions | Position	16	122
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Within one year	$ 4,031
From one to five years	369,188
From five to ten years	137,908
After ten years	519,593
Total, Amortized Cost	1,030,720
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Within one year	4,058
From one to five years	371,294
From five to ten years	140,701
After ten years	527,013
Total, Fair Value	1,043,066
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Within one year	42,420
From one to five years	15,186
From five to ten years	107,816
After ten years	305,336
Amortized cost	470,758	$ 454,361
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Within one year	42,427
From one to five years	15,260
From five to ten years	109,043
After ten years	308,706
Total, Fair Value	475,436	454,994
US Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		23,041
Unrealized gains		70
Unrealized losses		0
Estimated fair value		23,111
Federal Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	342,140	332,193
Unrealized gains	1,245	327
Unrealized losses	(122)	(2,606)
Estimated fair value	343,263	329,914
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	19,962	66,528
12 Months or Longer, Fair Value	29,908	198,151
Total, Fair Value	49,870	264,679
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(30)	(226)
12 months or longer Unrealized Losses	(92)	(2,380)
Total Unrealized Losses	$ (122)	$ (2,606)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions | Position	2	8
12 Months or Longer, Number of Positions | Position	3	16
Total, Number of Positions | Position	5	24
State & Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 33,140	$ 37,035
Unrealized gains	510	587
Unrealized losses	(3)	(52)
Estimated fair value	33,647	37,570
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	2,957	8,818
12 Months or Longer, Fair Value	0	1,321
Total, Fair Value	2,957	10,139
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(3)	(42)
12 months or longer Unrealized Losses	0	(10)
Total Unrealized Losses	$ (3)	$ (52)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions | Position	4	33
12 Months or Longer, Number of Positions | Position	0	5
Total, Number of Positions | Position	4	38
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	$ 11,656	$ 10,400
12 Months or Longer, Fair Value	4,319	35,565
Total, Fair Value	15,975	45,965
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(109)	(36)
12 months or longer Unrealized Losses	(60)	(254)
Total Unrealized Losses	$ (169)	$ (290)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions | Position	14	10
12 Months or Longer, Number of Positions | Position	16	31
Total, Number of Positions | Position	30	41
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 313,840	$ 339,190
Unrealized gains	7,118	7,597
Unrealized losses	(105)	(224)
Estimated fair value	320,853	346,563
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	14,293	17,367
Unrealized gains	728	863
Unrealized losses	(64)	(66)
Estimated fair value	14,957	18,164
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	29,608	57,682
12 Months or Longer, Fair Value	4,340	6,598
Total, Fair Value	33,948	64,280
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(62)	(196)
12 months or longer Unrealized Losses	(22)	(74)
Total Unrealized Losses	$ (84)	$ (270)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions | Position	5	8
12 Months or Longer, Number of Positions | Position	3	4
Total, Number of Positions | Position	8	12
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 296,005	$ 199,837
Unrealized gains	2,638	1,828
Unrealized losses	(63)	(234)
Estimated fair value	298,580	201,431
Collateralized Mortgage Obligations, U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	31,302	40,237
Unrealized gains	485	497
Unrealized losses	(21)	(36)
Estimated fair value	31,766	40,698
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	12,900	12,818
Unrealized gains	2,531	3,054
Unrealized losses	(100)	(152)
Estimated fair value	15,331	15,720
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	0	0
12 Months or Longer, Fair Value	3,931	3,201
Total, Fair Value	3,931	3,201
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	0	0
12 months or longer Unrealized Losses	(100)	(152)
Total Unrealized Losses	$ (100)	$ (152)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions | Position	0	0
12 Months or Longer, Number of Positions | Position	3	2
Total, Number of Positions | Position	3	2
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	$ 9,757
12 Months or Longer, Fair Value	0
Total, Fair Value	9,757
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	(25)
12 Months or Longer, Unrealized Losses	0
Total, Unrealized Losses	$ (25)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position	1
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position	0
Total, Number of Positions | Position	1
Mortgage-Backed [Member] | Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 9,782	$ 755
Unrealized gains	0	113
Unrealized losses	(25)	0
Estimated fair value	9,757	868
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	9,782	755
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	9,757	868
Mortgage-Backed [Member] | Collateralized Mortgage Obligations, U.S. Government Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	665
Unrealized gains	107
Unrealized losses	0
Estimated fair value	772
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	665
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	772
State & Municipal [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	177,345	135,978
Unrealized gains	1,509	674
Unrealized losses	(43)	(123)
Estimated fair value	178,811	136,529
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	6,313	43,514
12 Months or Longer, Fair Value	0	1,619
Total, Fair Value	6,313	45,133
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	(43)	(116)
12 Months or Longer, Unrealized Losses	0	(7)
Total, Unrealized Losses	$ (43)	$ (123)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position	11	110
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position	0	6
Total, Number of Positions | Position	11	116
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	$ 177,345	$ 135,978
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	178,811	136,529
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	0	26,052
12 Months or Longer, Fair Value	43,127	46,415
Total, Fair Value	43,127	72,467
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	0	(49)
12 Months or Longer, Unrealized Losses	(951)	(1,916)
Total, Unrealized Losses	$ (951)	$ (1,965)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position	0	2
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position	4	4
Total, Number of Positions | Position	4	6
Collateralized Mortgage Obligations [Member] | Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 282,966	$ 317,628
Unrealized gains	4,081	1,934
Unrealized losses	(951)	(1,965)
Estimated fair value	286,096	317,597
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	282,966	317,628
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	$ 286,096	$ 317,597

Allowance for Loan Losses and31

Allowance for Loan Losses and Credit Quality of Loans (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan portfolio segments	3
Commercial Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loan amount, percentage of appraised value or purchase price of the property, maximum	80.00%
Commercial Loans [Member] | Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loan amount, percentage of appraised value or purchase price of the property, maximum	75.00%
Commercial Loans [Member] | Business Banking [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business banking loans, maximum amount | $	$ 0.5
Consumer Loans [Member] | Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of automobile financing to indirect relationships with dealers	75.00%
Principal repayment term of loan, minimum	3 years
Principal repayment term of loan, maximum	6 years
Consumer Loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Home equity loan amount, percentage of equity in home, maximum	85.00%
Consumer Loans [Member] | Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal repayment term of loan, minimum	1 year
Principal repayment term of loan, maximum	10 years
Residential Real Estate Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loan amount, percentage of appraised value or purchase price of the property, maximum	85.00%

Allowance for Loan Losses and32

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 64,959	$ 69,534	$ 66,359	$ 69,434
Charge-offs	(6,374)	(5,977)	(17,422)	(16,047)
Recoveries	1,308	892	3,416	3,300
Provision	4,966	4,885	12,506	12,647
Balance, end of period	64,859	69,334	64,859	69,334
Allowance for loan losses for acquired loan portfolio			1,900	3,000
Provision expense and net charge-offs related to acquired loans	500	300	1,200	500
Allowance loan losses [Abstract]
Allowance for loan losses	64,959	69,534	66,359	69,434	$ 64,859	$ 66,359
Allowance for loans individually evaluated for impairment					3,545	1,100
Allowance for loans collectively evaluated for impairment					61,314	65,259
Ending balance of loans					5,870,988	5,595,271
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	28,326	35,123	32,433	35,090
Charge-offs	(1,333)	(1,517)	(2,715)	(3,423)
Recoveries	258	253	772	966
Provision	(2,800)	1,779	(6,039)	3,005
Balance, end of period	24,451	35,638	24,451	35,638
Allowance loan losses [Abstract]
Allowance for loan losses	28,326	35,123	32,433	35,090	24,451	32,433
Allowance for loans individually evaluated for impairment					3,545	1,100
Allowance for loans collectively evaluated for impairment					20,906	31,333
Ending balance of loans					2,602,385	2,473,702
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	28,314	27,973	26,720	27,694
Charge-offs	(4,530)	(3,979)	(13,183)	(11,659)
Recoveries	889	632	2,334	2,087
Provision	7,333	2,826	16,135	9,330
Balance, end of period	32,006	27,452	32,006	27,452
Allowance loan losses [Abstract]
Allowance for loan losses	28,314	27,973	26,720	27,694	32,006	26,720
Allowance for loans individually evaluated for impairment					0	0
Allowance for loans collectively evaluated for impairment					32,006	26,720
Ending balance of loans					2,091,408	2,005,980
Residential Real Estate Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	8,281	6,205	7,130	6,520
Charge-offs	(511)	(481)	(1,524)	(965)
Recoveries	161	7	310	247
Provision	51	212	2,066	141
Balance, end of period	7,982	5,943	7,982	5,943
Allowance loan losses [Abstract]
Allowance for loan losses	8,281	6,205	7,130	6,520	7,982	7,130
Allowance for loans individually evaluated for impairment					0	0
Allowance for loans collectively evaluated for impairment					7,982	7,130
Ending balance of loans					1,177,195	1,115,589
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	38	233	76	130
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	382	68	344	171
Balance, end of period	420	301	420	301
Allowance loan losses [Abstract]
Allowance for loan losses	$ 38	$ 233	$ 76	$ 130	420	76
Allowance for loans collectively evaluated for impairment					420	76
Originated Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans					5,217,167	4,847,937
Ending balance of loans individually evaluated for impairment					26,016	20,121
Ending balance of loans collectively evaluated for impairment					5,191,151	4,827,816
Originated Loans [Member] | Commercial Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans					2,297,178	2,140,371
Ending balance of loans individually evaluated for impairment					12,559	11,079
Ending balance of loans collectively evaluated for impairment					2,284,619	2,129,292
Originated Loans [Member] | Consumer Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans					1,984,440	1,858,724
Ending balance of loans individually evaluated for impairment					7,590	5,498
Ending balance of loans collectively evaluated for impairment					1,976,850	1,853,226
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Allowance loan losses [Abstract]
Ending balance of loans					935,549	848,842
Ending balance of loans individually evaluated for impairment					5,867	3,544
Ending balance of loans collectively evaluated for impairment					929,682	845,298
Acquired Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans					653,821	747,334
Ending balance of loans individually evaluated for impairment					9,317	5,675
Ending balance of loans collectively evaluated for impairment					644,504	741,659
Acquired Loans [Member] | Commercial Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans					305,207	333,331
Ending balance of loans individually evaluated for impairment					9,317	5,675
Ending balance of loans collectively evaluated for impairment					295,890	327,656
Acquired Loans [Member] | Consumer Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans					106,968	147,256
Ending balance of loans individually evaluated for impairment					0	0
Ending balance of loans collectively evaluated for impairment					106,968	147,256
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]
Allowance loan losses [Abstract]
Ending balance of loans					241,646	266,747
Ending balance of loans individually evaluated for impairment					0	0
Ending balance of loans collectively evaluated for impairment					$ 241,646	$ 266,747

Allowance for Loan Losses and33

Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	$ 37,191	$ 38,493
Non-Accrual	42,524	41,074
Current	5,791,273	5,515,704
Ending balance of loans	5,870,988	5,595,271
31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	28,390	27,402
61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,011	6,150
Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,790	4,941
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Ending balance of loans	2,602,385	2,473,702
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Ending balance of loans	2,091,408	2,005,980
Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Ending balance of loans	1,177,195	1,115,589
Originated Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	35,016	35,505
Non-Accrual	29,549	30,845
Current	5,152,602	4,781,587
Ending balance of loans	5,217,167	4,847,937
Originated Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	27,044	25,496
Originated Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,788	5,805
Originated Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,184	4,204
Originated Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,319	2,064
Non-Accrual	13,847	13,431
Current	2,278,012	2,124,876
Ending balance of loans	2,297,178	2,140,371
Originated Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,074	1,010
Originated Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	245	970
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	84
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,150	735
Non-Accrual	1,264	1,012
Current	647,577	613,400
Ending balance of loans	650,991	615,147
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	2,050	0
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	100	735
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	537	192
Non-Accrual	6,236	4,127
Current	1,176,523	1,064,549
Ending balance of loans	1,183,296	1,068,868
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	537	192
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	900	817
Current	32,486	32,130
Ending balance of loans	33,386	32,947
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	557	19
Non-Accrual	500	565
Current	25,758	24,390
Ending balance of loans	26,815	24,974
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	557	19
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	2,075	1,118
Non-Accrual	4,947	6,910
Current	395,668	390,407
Ending balance of loans	402,690	398,435
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,930	799
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	145	235
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	84
Originated Loans [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	26,052	29,188
Non-Accrual	7,240	8,644
Current	1,951,148	1,820,892
Ending balance of loans	1,984,440	1,858,724
Originated Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	19,658	21,585
Originated Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,463	4,739
Originated Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,931	2,864
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	19,688	21,579
Non-Accrual	1,718	1,964
Current	1,431,946	1,286,507
Ending balance of loans	1,453,352	1,310,050
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	15,041	16,434
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	3,159	3,154
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	1,488	1,991
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,680	6,840
Non-Accrual	5,436	6,596
Current	462,546	479,444
Ending balance of loans	473,662	492,880
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	4,091	4,591
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	1,205	1,428
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	384	821
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	684	769
Non-Accrual	86	84
Current	56,656	54,941
Ending balance of loans	57,426	55,794
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	526	560
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	99	157
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	59	52
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,645	4,253
Non-Accrual	8,462	8,770
Current	923,442	835,819
Ending balance of loans	935,549	848,842
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	2,312	2,901
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	80	96
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	1,253	1,256
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,175	2,988
Non-Accrual	12,975	10,229
Current	638,671	734,117
Ending balance of loans	653,821	747,334
Acquired Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,346	1,906
Acquired Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	223	345
Acquired Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	606	737
Acquired Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	94	20
Non-Accrual	9,457	6,340
Current	295,656	326,971
Ending balance of loans	305,207	333,331
Acquired Loans [Member] | Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	63	5
Acquired Loans [Member] | Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	19	15
Acquired Loans [Member] | Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	12	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Non-Accrual	2,509	3,009
Current	69,553	72,255
Ending balance of loans	72,062	75,264
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	6,804	2,666
Current	175,026	197,222
Ending balance of loans	181,830	199,888
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	94	20
Non-Accrual	144	665
Current	51,077	57,494
Ending balance of loans	51,315	58,179
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	63	5
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	19	15
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	12	0
Acquired Loans [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	598	870
Non-Accrual	721	696
Current	105,649	145,690
Ending balance of loans	106,968	147,256
Acquired Loans [Member] | Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	420	739
Acquired Loans [Member] | Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	163	65
Acquired Loans [Member] | Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	15	66
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	303	577
Non-Accrual	96	106
Current	34,623	64,540
Ending balance of loans	35,022	65,223
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	219	518
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	70	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	14	54
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	247	255
Non-Accrual	591	557
Current	67,064	75,904
Ending balance of loans	67,902	76,716
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	190
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	70	60
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	5
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	48	38
Non-Accrual	34	33
Current	3,962	5,246
Ending balance of loans	4,044	5,317
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	31
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	23	0
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1	7
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,483	2,098
Non-Accrual	2,797	3,193
Current	237,366	261,456
Ending balance of loans	241,646	266,747
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	863	1,162
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	41	265
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	$ 579	$ 671

Allowance for Loan Losses and34

Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Minimum balance for classified loans to be evaluated individually for impairment	$ 500		$ 500
With an allowance recorded [Abstract]
Recorded investment balance (book)	35,333		35,333		$ 25,796
Unpaid principal balance (legal)	41,334		41,334		32,290
Related allowance	3,545		3,545		1,100
Average recorded investment	35,142	$ 31,705	33,980	$ 32,162
Interest income recognized accrual	269	179	694	463
Originated Loans [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	19,975		19,975		17,358
Unpaid principal balance (legal)	21,644		21,644		19,181
With an allowance recorded [Abstract]
Average recorded investment	25,693	22,146	24,252	22,398
Interest income recognized accrual	269	179	694	463
Originated Loans [Member] | Commercial Loans [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	6,518		6,518		8,316
Unpaid principal balance (legal)	6,855		6,855		9,189
With an allowance recorded [Abstract]
Recorded investment balance (book)	6,041		6,041		2,763
Unpaid principal balance (legal)	7,912		7,912		4,611
Related allowance	1,695		1,695		600
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	1,694		1,694		1,748
Unpaid principal balance (legal)	1,846		1,846		1,901
With an allowance recorded [Abstract]
Recorded investment balance (book)	948		948		0
Unpaid principal balance (legal)	953		953		0
Related allowance	300		300		0
Average recorded investment	2,469	1,957	2,026	2,001
Interest income recognized accrual	42	0	128	0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	3,187		3,187		4,505
Unpaid principal balance (legal)	3,198		3,198		4,520
With an allowance recorded [Abstract]
Recorded investment balance (book)	5,093		5,093		2,763
Unpaid principal balance (legal)	6,959		6,959		4,611
Related allowance	1,395		1,395		600
Average recorded investment	8,560	9,619	8,884	10,400
Interest income recognized accrual	42	43	124	127
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	19		19		20
Unpaid principal balance (legal)	25		25		26
With an allowance recorded [Abstract]
Average recorded investment	19	102	19	115
Interest income recognized accrual	0	0	1	1
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	623		623		1,147
Unpaid principal balance (legal)	749		749		1,441
With an allowance recorded [Abstract]
Average recorded investment	626	1,395	630	1,410
Interest income recognized accrual	11	12	34	35
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	995		995		896
Unpaid principal balance (legal)	1,037		1,037		1,301
With an allowance recorded [Abstract]
Average recorded investment	1,003	677	952	509
Interest income recognized accrual	3	10	9	33
Originated Loans [Member] | Consumer Loans [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	7,590		7,590		5,498
Unpaid principal balance (legal)	8,403		8,403		6,033
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	13		13		0
Unpaid principal balance (legal)	23		23		0
With an allowance recorded [Abstract]
Average recorded investment	20	0	14	0
Interest income recognized accrual	0	0	0	0
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	7,577		7,577		5,498
Unpaid principal balance (legal)	8,380		8,380		6,033
With an allowance recorded [Abstract]
Average recorded investment	7,432	5,435	6,869	5,099
Interest income recognized accrual	134	85	298	188
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	0		0		0
Unpaid principal balance (legal)	0		0		0
With an allowance recorded [Abstract]
Average recorded investment	0	0	1	0
Interest income recognized accrual	0	0	0	0
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	5,867		5,867		3,544
Unpaid principal balance (legal)	6,386		6,386		3,959
With an allowance recorded [Abstract]
Average recorded investment	5,564	2,961	4,857	2,864
Interest income recognized accrual	37	29	100	79
Acquired Loans [Member]
With an allowance recorded [Abstract]
Average recorded investment	9,449	9,559	9,728	9,764
Interest income recognized accrual	0	0	0	0
Acquired Loans [Member] | Commercial Loans [Member]
With an allowance recorded [Abstract]
Recorded investment balance (book)	3,829		3,829		3,009
Unpaid principal balance (legal)	5,989		5,989		4,668
Related allowance	1,850		1,850		500
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member]
With an allowance recorded [Abstract]
Recorded investment balance (book)	2,508		2,508		3,009
Unpaid principal balance (legal)	4,668		4,668		4,668
Related allowance	1,000		1,000		500
Average recorded investment	2,531	6,161	2,658	6,303
Interest income recognized accrual	0	0	0	0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]
With no allowance recorded [Abstract]
Recorded investment balance (book)	5,488		5,488		2,666
Unpaid principal balance (legal)	5,789		5,789		3,830
With an allowance recorded [Abstract]
Recorded investment balance (book)	1,321		1,321		0
Unpaid principal balance (legal)	1,321		1,321		0
Related allowance	850		850		$ 0
Average recorded investment	6,918	3,398	7,070	3,461
Interest income recognized accrual	$ 0	$ 0	$ 0	$ 0

Allowance for Loan Losses and35

Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Originated Loans [Member] | Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 1,894,488	$ 1,741,936
Originated Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,786,166	1,648,664
Originated Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	47,120	23,680
Originated Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,194	69,584
Originated Loans [Member] | Commercial Credit Exposure [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8	8
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	650,991	615,147
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	600,507	570,884
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	18,395	6,022
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	32,089	38,241
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	1,183,296	1,068,868
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,127,116	1,023,856
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	28,718	17,341
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	27,462	27,671
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	33,386	32,947
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	32,759	30,481
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1	275
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	618	2,183
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8	8
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	26,815	24,974
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	25,784	23,443
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	6	42
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,025	1,489
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] | Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	402,690	398,435
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	387,378	379,445
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	15,312	18,990
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	402,690	398,435
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	387,378	379,445
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	15,312	18,990
Originated Loans [Member] | Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,984,440	1,858,724
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,975,269	1,847,216
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	9,171	11,508
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,453,352	1,310,050
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,450,146	1,306,095
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,206	3,955
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	473,662	492,880
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	467,842	485,463
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,820	7,417
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	57,426	55,794
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	57,281	55,658
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	145	136
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	935,549	848,842
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	925,834	838,816
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	9,715	10,026
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	935,549	848,842
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	925,834	838,816
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	9,715	10,026
Acquired Loans [Member] | Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	253,892	275,152
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	230,718	249,666
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	6,719	5,486
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	16,455	20,000
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	72,062	75,264
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	66,770	63,630
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	939	2,840
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,353	8,794
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	181,830	199,888
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	163,948	186,036
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,780	2,646
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	12,102	11,206
Acquired Loans [Member] | Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	51,315	58,179
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	47,310	53,264
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,005	4,915
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	51,315	58,179
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	47,310	53,264
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,005	4,915
Acquired Loans [Member] | Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	106,968	147,256
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	106,232	146,494
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	736	762
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	35,022	65,223
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	34,912	65,063
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	110	160
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	67,902	76,716
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	67,311	76,154
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	591	562
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,044	5,317
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	4,009	5,277
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	35	40
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	241,646	266,747
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	238,270	262,883
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,376	3,864
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	241,646	266,747
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	238,270	262,883
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 3,376	$ 3,864

Allowance for Loan Losses and36

Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract	Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Period of sustained repayment performance for nonperforming TDRs to be returned to performing status			6 months
Number of contracts | Contract	28	11	77	70
Pre-modification outstanding recorded investment	$ 2,156	$ 429	$ 7,857	$ 5,783
Post-modification outstanding recorded investment	$ 1,993	$ 348	$ 6,230	$ 4,540
Number of TDR loans with subsequent default | Contract	2	2	6	7
Outstanding recorded investment on TDR loans with subsequent default	$ 174	$ 73	$ 518	$ 515
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract			2
Pre-modification outstanding recorded investment			$ 1,470
Post-modification outstanding recorded investment			$ 359
Commercial Loans [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract			1
Pre-modification outstanding recorded investment			$ 1,250
Post-modification outstanding recorded investment			$ 186
Commercial Loans [Member] | Small Business [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract			1	2
Pre-modification outstanding recorded investment			$ 220	$ 570
Post-modification outstanding recorded investment			$ 173	$ 558
Consumer Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract		8	43	49
Pre-modification outstanding recorded investment		$ 250	$ 3,321	$ 3,056
Post-modification outstanding recorded investment		$ 187	$ 3,017	$ 2,354
Number of TDR loans with subsequent default | Contract	0	1	4	7
Outstanding recorded investment on TDR loans with subsequent default	$ 0	$ 25	$ 344	$ 515
Consumer Loans [Member] | Indirect [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract				2
Pre-modification outstanding recorded investment				$ 69
Post-modification outstanding recorded investment				$ 38
Consumer Loans [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	12	1	39	7
Pre-modification outstanding recorded investment	$ 863	$ 25	$ 3,212	$ 286
Post-modification outstanding recorded investment	$ 802	$ 24	$ 2,915	$ 273
Number of TDR loans with subsequent default | Contract	0	1	4	7
Outstanding recorded investment on TDR loans with subsequent default	$ 0	$ 25	$ 344	$ 515
Consumer Loans [Member] | Direct [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract		7	4	40
Pre-modification outstanding recorded investment		$ 225	$ 109	$ 2,701
Post-modification outstanding recorded investment		$ 163	$ 102	$ 2,043
Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts | Contract	16	3	32	19
Pre-modification outstanding recorded investment	$ 1,293	$ 179	$ 3,066	$ 2,157
Post-modification outstanding recorded investment	$ 1,191	$ 161	$ 2,854	$ 1,628
Number of TDR loans with subsequent default | Contract	2	1	2	0
Outstanding recorded investment on TDR loans with subsequent default	$ 174	$ 48	$ 174	$ 0

Defined Benefit Postretiremen37

Defined Benefit Postretirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	$ 669	$ 587	$ 1,979	$ 1,761
Interest cost	996	1,040	2,992	3,120
Expected return on plan assets	(2,147)	(2,175)	(6,447)	(6,525)
Net amortization	550	25	1,642	75
Total cost (benefit)	68	(523)	166	(1,569)
Other Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	4	4	12	12
Interest cost	101	90	283	270
Expected return on plan assets	0	0	0	0
Net amortization	1	(6)	31	(18)
Total cost (benefit)	$ 106	$ 88	$ 326	$ 264

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,692,000	43,882,000	43,949,000	43,847,000
Net income	$ 19,851	$ 10,912	$ 57,298	$ 56,561
Basic EPS (in dollars per share)	$ 0.45	$ 0.25	$ 1.30	$ 1.29
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,692,000	43,882,000	43,949,000	43,847,000
Dilutive effect of common stock options and restricted stock (in shares)	570,000	523,000	519,000	507,000
Weighted average common shares and common share equivalents (in shares)	44,262,000	44,405,000	44,468,000	44,354,000
Net income	$ 19,851	$ 10,912	$ 57,298	$ 56,561
Diluted EPS (in dollars per share)	$ 0.45	$ 0.25	$ 1.29	$ 1.28
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from calculation of diluted EPS (in shares)	36,360	501,843	334,759	502,836

Reclassification Adjustments 39

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (gains) losses	$ (3)	$ (38)	$ (43)	$ (59)
Interest income	64,245	63,763	189,096	187,854
Salaries and employee benefits	30,227	28,933	91,240	89,609
Income tax expense (benefit)	10,798	5,576	29,745	28,307
Net of tax	19,851	10,912	57,298	56,561
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	535	(71)	1,605	(60)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (gains) losses	(3)	(38)	(43)	(59)
Interest income	328	(99)	999	(99)
Income tax expense (benefit)	(127)	55	(372)	64
Net of tax	198	(82)	584	(94)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	(214)	(8)	(652)	(23)
Net of tax	337	11	1,021	34
Amortization of Net Gains [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	566	74	1,697	222
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ (15)	$ (55)	$ (24)	$ (165)

Fair Value Measurements and F40

Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Securities Available for Sale [Abstract]
Total Securities Available for Sale	$ 1,058,397	$ 1,013,171
Trading Securities	7,900	7,793
Liabilities [Abstract]
Allowance for loan and lease losses collateral dependent impaired loans with specific reserves	$ 3,500		$ 3,600
Liquidation expense ratio on impaired collateral minimum	10.00%
Liquidation expense ratio on impaired collateral maximum	35.00%
Financial assets [Abstract]
Securities held to maturity	$ 475,436	454,994
Financial liabilities [Abstract]
Time deposits	931,966	1,043,823
Long-term debt	130,635	130,945
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Securities held to maturity	470,758	454,361
Financial liabilities [Abstract]
Time deposits	931,966	1,043,823
Long-term debt	130,635	130,945
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Net Loans	5,806,129	5,528,912
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Securities held to maturity	475,436	454,994
Financial liabilities [Abstract]
Time deposits	929,477	1,038,877
Long-term debt	132,849	132,562
Junior subordinated debt	91,396	103,770
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Net Loans	5,957,554	5,584,777
Recurring Basis [Member]
Securities Available for Sale [Abstract]
U.S. Treasury		23,111
Federal Agency	343,263	329,914
State & municipal	33,647	37,570
Mortgage-backed	335,810	364,727
Collateralized mortgage obligations	330,346	242,129
Other securities	15,331	15,720
Total Securities Available for Sale	1,058,397	1,013,171
Trading Securities	7,900	7,793
Interest Rate Swaps	8,707	4,707
Total	1,075,004	1,025,671
Liabilities [Abstract]
Interest Rate Swaps	8,707	4,707
Total	8,707	4,707
Recurring Basis [Member] | Quoted Prices in Active Market for Identical Assets (Level I) [Member]
Securities Available for Sale [Abstract]
U.S. Treasury		23,111
Federal Agency	0	0
State & municipal	0	0
Mortgage-backed	0	0
Collateralized mortgage obligations	0	0
Other securities	7,422	7,612
Total Securities Available for Sale	7,422	30,723
Trading Securities	7,900	7,793
Interest Rate Swaps	0	0
Total	15,322	38,516
Liabilities [Abstract]
Interest Rate Swaps	0	0
Total	0	0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities Available for Sale [Abstract]
U.S. Treasury		0
Federal Agency	343,263	329,914
State & municipal	33,647	37,570
Mortgage-backed	335,810	364,727
Collateralized mortgage obligations	330,346	242,129
Other securities	7,909	8,108
Total Securities Available for Sale	1,050,975	982,448
Trading Securities	0	0
Interest Rate Swaps	8,707	4,707
Total	1,059,682	987,155
Liabilities [Abstract]
Interest Rate Swaps	8,707	4,707
Total	8,707	4,707
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities Available for Sale [Abstract]
U.S. Treasury		0
Federal Agency	0	0
State & municipal	0	0
Mortgage-backed	0	0
Collateralized mortgage obligations	0	0
Other securities	0	0
Total Securities Available for Sale	0	0
Trading Securities	0	0
Interest Rate Swaps	0	0
Total	0	0
Liabilities [Abstract]
Interest Rate Swaps	0	0
Total	0	$ 0
Nonrecurring Basis [Member]
Liabilities [Abstract]
Collateral dependent impaired financing receivable with specific reserves	$ 9,900		$ 8,800

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Commitment to Extend Credits and Unused Lines of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 1,300	$ 1,200
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 32.4	35.2
Obligation instrument term	5 years
Commercial Letters of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 5.3	$ 22.5