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Loans and Leases - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 4,708,325	$ 4,672,909
Less: unearned income and deferred costs and fees	(3,479)	(3,789)
Total loans and leases, net of unearned income and deferred costs and fees	4,704,846	4,669,120
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,060,945	1,091,651
Commercial and industrial | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	93,896	108,608
Commercial and industrial | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	967,049	983,043
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,259,386	2,200,727
Commercial real estate | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	135,725	129,959
Commercial real estate | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,922,020	1,866,802
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	201,641	203,966
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,311,443	1,302,941
Residential real estate | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	237,528	241,256
Residential real estate | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,073,915	1,061,685
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	62,733	63,123
Consumer and other | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	50,812	50,979
Consumer and other | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	11,921	12,144
Finance Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	13,818	14,467
Originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	4,400,226	4,349,180
Total	4,411,560	4,362,332
90 days and accruing	0	44
Nonaccrual	18,429	16,253
Less: unearned income and deferred costs and fees	(3,479)	(3,789)
Less: unearned income and deferred costs and fees	(3,479)	(3,789)
Less: unearned income and deferred costs and fees, 90 days and accruing	0	0
Less: unearned income and deferred costs and fees, nonaccrual	0	0
Total loans and leases, net of unearned income and deferred costs and fees	4,408,081	4,358,543
Total originated loans and leases, net of unearned income and deferred costs and fees, Current	4,396,747	4,345,391
Originated | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,513	6,791
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	6,513	6,791
Originated | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	4,821	6,361
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	4,821	6,361
Originated | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,008,961	1,039,395
Total	1,010,416	1,040,675
90 days and accruing	0	0
Nonaccrual	4,668	2,852
Originated | Commercial and industrial | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	736	431
Originated | Commercial and industrial | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	719	849
Originated | Commercial and industrial | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	93,896	108,608
Total	93,896	108,608
90 days and accruing	0	0
Nonaccrual	0	0
Originated | Commercial and industrial | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Originated | Commercial and industrial | Agriculture | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Originated | Commercial and industrial | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	915,065	930,787
Total	916,520	932,067
90 days and accruing	0	0
Nonaccrual	4,668	2,852
Originated | Commercial and industrial | Commercial and industrial other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	736	431
Originated | Commercial and industrial | Commercial and industrial other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	719	849
Originated | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	2,058,578	1,989,272
Total	2,062,343	1,992,980
90 days and accruing	0	0
Nonaccrual	5,192	5,402
Originated | Commercial real estate | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,804	1,583
Originated | Commercial real estate | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	961	2,125
Originated | Commercial real estate | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	135,321	129,712
Total	135,484	129,712
90 days and accruing	0	0
Nonaccrual	0	0
Originated | Commercial real estate | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	163	0
Originated | Commercial real estate | Agriculture | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Originated | Commercial real estate | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,723,072	1,657,074
Total	1,726,674	1,660,782
90 days and accruing	0	0
Nonaccrual	5,192	5,402
Originated | Commercial real estate | Commercial and industrial other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,641	1,583
Originated | Commercial real estate | Commercial and industrial other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	961	2,125
Originated | Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	200,185	202,486
Total	200,185	202,486
90 days and accruing	0	0
Nonaccrual	0	0
Originated | Commercial real estate | Construction | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Originated | Commercial real estate | Construction | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Originated | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,257,559	1,244,514
Total	1,263,155	1,251,852
90 days and accruing	0	0
Nonaccrual	8,329	7,645
Originated | Residential real estate | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,522	4,198
Originated | Residential real estate | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,074	3,140
Originated | Residential real estate | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	210,343	211,319
Total	211,444	212,812
90 days and accruing	0	0
Nonaccrual	1,504	1,537
Originated | Residential real estate | Home equity | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	670	1,045
Originated | Residential real estate | Home equity | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	431	448
Originated | Residential real estate | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,047,216	1,033,195
Total	1,051,711	1,039,040
90 days and accruing	0	0
Nonaccrual	6,825	6,108
Originated | Residential real estate | Mortgages | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,852	3,153
Originated | Residential real estate | Mortgages | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,643	2,692
Originated | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	61,310	61,532
Total	61,828	62,358
90 days and accruing	0	44
Nonaccrual	240	354
Originated | Consumer and other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	451	579
Originated | Consumer and other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	67	247
Originated | Consumer and other | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	49,737	50,042
Total	49,907	50,214
90 days and accruing	0	38
Nonaccrual	76	76
Originated | Consumer and other | Commercial and industrial other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	155	130
Originated | Consumer and other | Commercial and industrial other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	15	42
Originated | Consumer and other | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	11,573	11,490
Total	11,921	12,144
90 days and accruing	0	6
Nonaccrual	164	278
Originated | Consumer and other | Indirect | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	296	449
Originated | Consumer and other | Indirect | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	52	205
Originated | Finance Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	13,818	14,467
Total	13,818	14,467
90 days and accruing	0	0
Nonaccrual	0	0
Originated | Finance Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Originated | Finance Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	293,293	307,027
Total	296,765	310,577
90 days and accruing	1,077	1,146
Nonaccrual	3,352	3,264
Less: unearned income and deferred costs and fees	0	0
Total loans and leases, net of unearned income and deferred costs and fees	296,765	310,577
Acquired | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	823	1,256
Acquired | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,649	2,294
Acquired | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	50,457	50,903
Total	50,529	50,976
90 days and accruing	60	61
Nonaccrual	13	0
Acquired | Commercial and industrial | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	12	12
Acquired | Commercial and industrial | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	60	61
Acquired | Commercial and industrial | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Acquired | Commercial and industrial | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	50,457	50,903
Total	50,529	50,976
90 days and accruing	60	61
Nonaccrual	13	0
Acquired | Commercial and industrial | Commercial and industrial other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	12	12
Acquired | Commercial and industrial | Commercial and industrial other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	60	61
Acquired | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	195,432	206,853
Total	197,043	207,747
90 days and accruing	502	515
Nonaccrual	528	546
Acquired | Commercial real estate | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	67	167
Acquired | Commercial real estate | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,544	727
Acquired | Commercial real estate | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	241	247
Total	241	247
90 days and accruing	0	0
Nonaccrual	0	0
Acquired | Commercial real estate | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired | Commercial real estate | Agriculture | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired | Commercial real estate | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	193,735	205,126
Total	195,346	206,020
90 days and accruing	502	515
Nonaccrual	528	546
Acquired | Commercial real estate | Commercial and industrial other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	67	167
Acquired | Commercial real estate | Commercial and industrial other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,544	727
Acquired | Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,456	1,480
Total	1,456	1,480
90 days and accruing	0	0
Nonaccrual	0	0
Acquired | Commercial real estate | Construction | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired | Commercial real estate | Construction | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	46,499	48,510
Total	48,288	51,089
90 days and accruing	515	570
Nonaccrual	2,811	2,718
Acquired | Residential real estate | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	744	1,073
Acquired | Residential real estate | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,045	1,506
Acquired | Residential real estate | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	25,479	27,279
Total	26,084	28,444
90 days and accruing	62	130
Nonaccrual	1,693	1,604
Acquired | Residential real estate | Home equity | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	210	601
Acquired | Residential real estate | Home equity | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	395	564
Acquired | Residential real estate | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	21,020	21,231
Total	22,204	22,645
90 days and accruing	453	440
Nonaccrual	1,118	1,114
Acquired | Residential real estate | Mortgages | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	534	472
Acquired | Residential real estate | Mortgages | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	650	942
Acquired | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	905	761
Total	905	765
90 days and accruing	0	0
Nonaccrual	0	0
Acquired | Consumer and other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	4
Acquired | Consumer and other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired | Consumer and other | Commercial and industrial other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	905	761
Total	905	765
90 days and accruing	0	0
Nonaccrual	0	0
Acquired | Consumer and other | Commercial and industrial other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	4
Acquired | Consumer and other | Commercial and industrial other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
Acquired | Consumer and other | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	0	0
Acquired | Covered loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		0
Total	0	0
90 days and accruing		0
Nonaccrual		0
Acquired | Covered loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0
Acquired | Covered loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0
Acquired | Finance Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 0	$ 0

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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