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Loans and Leases - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		$ 4,494,234	$ 4,261,979
Less: unearned income and deferred costs and fees		(3,721)	(3,946)
Total loans and leases, net of unearned income and deferred costs and fees		4,490,513	4,258,033
Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		4,157,371	3,852,240
Total		4,170,975	3,867,868
90 days and accruing	[1]	0	0
Nonaccrual		15,667	14,300
Less: unearned income and deferred costs and fees		(3,721)	(3,946)
Less: unearned income and deferred costs and fees		(3,721)	(3,946)
Less: unearned income and deferred costs and fees, 90 days and accruing	[1]	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		4,167,254	3,863,922
Total originated loans and leases, net of unearned income and deferred costs and fees, Current		4,153,650	3,848,294
Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		5,567	6,694
Less: unearned income and deferred costs and fees		0	0
Total loans and leases, net of unearned income and deferred costs and fees		5,567	6,694
Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		8,037	8,934
Less: unearned income and deferred costs and fees		0	0
Total loans and leases, net of unearned income and deferred costs and fees		8,037	8,934
Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		316,276	385,231
Total		323,259	394,111
90 days and accruing	[1]	1,306	2,557
Nonaccrual		3,152	4,741
Less: unearned income and deferred costs and fees		0	0
Total loans and leases, net of unearned income and deferred costs and fees		323,259	394,111
Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		2,857	2,553
Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		4,126	6,327
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		1,039,886	1,044,619
Commercial and industrial | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		91,054	118,247
Commercial and industrial | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		948,832	926,372
Commercial and industrial | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		984,284	963,709
Total		986,402	965,302
90 days and accruing	[1]	0	0
Nonaccrual		2,367	526
Commercial and industrial | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,009	1,312
Commercial and industrial | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,109	281
Commercial and industrial | Originated Loans and Leases | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		91,054	118,247
Total		91,054	118,247
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Commercial and industrial | Originated Loans and Leases | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial and industrial | Originated Loans and Leases | Agriculture | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial and industrial | Originated Loans and Leases | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		893,230	845,462
Total		895,348	847,055
90 days and accruing	[1]	0	0
Nonaccrual		2,367	526
Commercial and industrial | Originated Loans and Leases | Other financing receivable | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,009	1,312
Commercial and industrial | Originated Loans and Leases | Other financing receivable | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,109	281
Commercial and industrial | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		52,575	79,218
Total		53,484	79,317
90 days and accruing	[1]	28	40
Nonaccrual		0	212
Commercial and industrial | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		881	12
Commercial and industrial | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		28	87
Commercial and industrial | Total Acquired Loans | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		0	0
Commercial and industrial | Total Acquired Loans | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		52,575	79,218
Total		53,484	79,317
90 days and accruing	[1]	28	40
Nonaccrual		0	212
Commercial and industrial | Total Acquired Loans | Other financing receivable | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		881	12
Commercial and industrial | Total Acquired Loans | Other financing receivable | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		28	87
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		2,091,145	1,920,841
Commercial real estate | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		122,561	102,776
Commercial real estate | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		1,749,840	1,673,295
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		218,744	144,770
Commercial real estate | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		1,872,141	1,664,399
Total		1,876,716	1,670,033
90 days and accruing	[1]	0	0
Nonaccrual		4,237	6,150
Commercial real estate | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,028	2,563
Commercial real estate | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		3,547	3,071
Commercial real estate | Originated Loans and Leases | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		122,290	102,492
Total		122,304	102,509
90 days and accruing	[1]	0	0
Nonaccrual		0	162
Commercial real estate | Originated Loans and Leases | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		14	17
Commercial real estate | Originated Loans and Leases | Agriculture | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial real estate | Originated Loans and Leases | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		1,532,633	1,426,073
Total		1,537,194	1,431,690
90 days and accruing	[1]	0	0
Nonaccrual		4,237	5,988
Commercial real estate | Originated Loans and Leases | Other financing receivable | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,014	2,546
Commercial real estate | Originated Loans and Leases | Other financing receivable | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		3,547	3,071
Commercial real estate | Originated Loans and Leases | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		217,218	135,834
Total		217,218	135,834
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Commercial real estate | Originated Loans and Leases | Construction | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial real estate | Originated Loans and Leases | Construction | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial real estate | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		212,129	245,395
Total		214,429	250,808
90 days and accruing	[1]	578	1,402
Nonaccrual		944	2,926
Commercial real estate | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		777	1,461
Commercial real estate | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,523	3,952
Commercial real estate | Total Acquired Loans | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		257	267
Total		257	267
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Commercial real estate | Total Acquired Loans | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial real estate | Total Acquired Loans | Agriculture | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial real estate | Total Acquired Loans | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		210,346	236,192
Total		212,646	241,605
90 days and accruing	[1]	578	1,402
Nonaccrual		944	2,926
Commercial real estate | Total Acquired Loans | Other financing receivable | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		777	1,461
Commercial real estate | Total Acquired Loans | Other financing receivable | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,523	3,952
Commercial real estate | Total Acquired Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		1,526	8,936
Total		1,526	8,936
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Commercial real estate | Total Acquired Loans | Construction | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Commercial real estate | Total Acquired Loans | Construction | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		1,285,247	1,219,815
Residential real estate | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		244,875	247,014
Residential real estate | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		1,040,372	972,801
Residential real estate | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		1,224,655	1,149,275
Total		1,230,775	1,156,655
90 days and accruing	[1]	0	0
Nonaccrual		8,677	7,458
Residential real estate | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		3,002	2,182
Residential real estate | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		3,118	5,198
Residential real estate | Originated Loans and Leases | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		212,804	206,890
Total		213,570	209,277
90 days and accruing	[1]	0	0
Nonaccrual		1,454	2,016
Residential real estate | Originated Loans and Leases | Home equity | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		653	433
Residential real estate | Originated Loans and Leases | Home equity | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		113	1,954
Residential real estate | Originated Loans and Leases | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		1,011,851	942,385
Total		1,017,205	947,378
90 days and accruing	[1]	0	0
Nonaccrual		7,223	5,442
Residential real estate | Originated Loans and Leases | Mortgages | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		2,349	1,749
Residential real estate | Originated Loans and Leases | Mortgages | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		3,005	3,244
Residential real estate | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		50,704	59,792
Total		54,472	63,160
90 days and accruing	[1]	700	1,115
Nonaccrual		2,208	1,603
Residential real estate | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,193	1,080
Residential real estate | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		2,575	2,288
Residential real estate | Total Acquired Loans | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		29,513	36,849
Total		31,305	37,737
90 days and accruing	[1]	166	185
Nonaccrual		1,009	663
Residential real estate | Total Acquired Loans | Home equity | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		835	251
Residential real estate | Total Acquired Loans | Home equity | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		957	637
Residential real estate | Total Acquired Loans | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		21,191	22,943
Total		23,167	25,423
90 days and accruing	[1]	534	930
Nonaccrual		1,199	940
Residential real estate | Total Acquired Loans | Mortgages | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		358	829
Residential real estate | Total Acquired Loans | Mortgages | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		1,618	1,651
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		62,434	60,054
Consumer and other | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		49,802	45,219
Consumer and other | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		12,632	14,835
Consumer and other | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		60,769	58,207
Total		61,560	59,228
90 days and accruing	[1]	0	0
Nonaccrual		386	166
Consumer and other | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		528	637
Consumer and other | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		263	384
Consumer and other | Originated Loans and Leases | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		48,751	44,192
Total		48,928	44,393
90 days and accruing	[1]	0	0
Nonaccrual		30	0
Consumer and other | Originated Loans and Leases | Other financing receivable | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		147	193
Consumer and other | Originated Loans and Leases | Other financing receivable | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		30	8
Consumer and other | Originated Loans and Leases | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		12,018	14,015
Total		12,632	14,835
90 days and accruing	[1]	0	0
Nonaccrual		356	166
Consumer and other | Originated Loans and Leases | Indirect | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		381	444
Consumer and other | Originated Loans and Leases | Indirect | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		233	376
Consumer and other | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		868	826
Total		874	826
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Consumer and other | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		6	0
Consumer and other | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Consumer and other | Total Acquired Loans | Other financing receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		868	826
Total		874	826
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Consumer and other | Total Acquired Loans | Other financing receivable | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		6	0
Consumer and other | Total Acquired Loans | Other financing receivable | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Consumer and other | Total Acquired Loans | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		0	0
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		15,522	16,650
Leases | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		15,522	16,650
Total		15,522	16,650
90 days and accruing	[1]	0	0
Nonaccrual		0	0
Leases | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Leases | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0	0
Leases | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		$ 0	$ 0
[1] Includes acquired loans that were recorded at fair value at the acquisition date.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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