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Loans and Leases - Schedule of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 4,795,025	$ 4,672,909
Less: unearned income and deferred costs and fees	(3,832)	(3,789)
Total loans and leases, net of unearned income and deferred costs and fees	4,791,193	4,669,120
Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	4,499,247	4,349,180
Total	4,510,838	4,362,332
90 days and accruing	0	44
Nonaccrual	19,082	16,253
Less: unearned income and deferred costs and fees	(3,832)	(3,789)
Less: unearned income and deferred costs and fees	(3,832)	(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	4,507,006	4,358,543
Total originated loans and leases, net of unearned income and deferred costs and fees, Current	4,495,415	4,345,391
Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	5,875	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	5,875	6,791
Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	5,716	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	5,716	6,361
Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	279,740	307,027
Total	284,187	310,577
90 days and accruing	1,110	1,146
Nonaccrual	2,673	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	284,187	310,577
Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,108	1,256
Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,339	2,294
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,080,641	1,091,651
Commercial and industrial | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	95,618	108,608
Commercial and industrial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	985,023	983,043
Commercial and industrial | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,033,221	1,039,395
Total	1,034,676	1,040,675
90 days and accruing	0	0
Nonaccrual	4,576	2,852
Commercial and industrial | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	515	431
Commercial and industrial | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	940	849
Commercial and industrial | Originated Loans and Leases | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	95,618	108,608
Total	95,618	108,608
90 days and accruing	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, Recorded Investment, Past Due [Line Items]
Current Loans	937,603	930,787
Total	939,058	932,067
90 days and accruing	0	0
Nonaccrual	4,576	2,852
Commercial and industrial | Originated Loans and Leases | Other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	515	431
Commercial and industrial | Originated Loans and Leases | Other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	940	849
Commercial and industrial | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	45,883	50,903
Total	45,965	50,976
90 days and accruing	59	61
Nonaccrual	23	0
Commercial and industrial | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	12
Commercial and industrial | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	82	61
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, Recorded Investment, Past Due [Line Items]
Current Loans	45,883	50,903
Total	45,965	50,976
90 days and accruing	59	61
Nonaccrual	23	0
Commercial and industrial | Total Acquired Loans | Other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	12
Commercial and industrial | Total Acquired Loans | Other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	82	61
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,305,227	2,200,727
Commercial real estate | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	143,465	129,959
Commercial real estate | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,927,408	1,866,802
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	234,354	203,966
Commercial real estate | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	2,110,730	1,989,272
Total	2,113,837	1,992,980
90 days and accruing	0	0
Nonaccrual	5,431	5,402
Commercial real estate | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,252	1,583
Commercial real estate | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,855	2,125
Commercial real estate | Originated Loans and Leases | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	143,229	129,712
Total	143,229	129,712
90 days and accruing	0	0
Nonaccrual	0	0
Commercial real estate | Originated Loans and Leases | Agriculture | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	0
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, Recorded Investment, Past Due [Line Items]
Current Loans	1,734,579	1,657,074
Total	1,737,686	1,660,782
90 days and accruing	0	0
Nonaccrual	5,431	5,402
Commercial real estate | Originated Loans and Leases | Other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,252	1,583
Commercial real estate | Originated Loans and Leases | Other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,855	2,125
Commercial real estate | Originated Loans and Leases | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	232,922	202,486
Total	232,922	202,486
90 days and accruing	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	188,914	206,853
Total	191,390	207,747
90 days and accruing	568	515
Nonaccrual	232	546
Commercial real estate | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	231	167
Commercial real estate | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,245	727
Commercial real estate | Total Acquired Loans | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	236	247
Total	236	247
90 days and accruing	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, Recorded Investment, Past Due [Line Items]
Current Loans	187,246	205,126
Total	189,722	206,020
90 days and accruing	568	515
Nonaccrual	232	546
Commercial real estate | Total Acquired Loans | Other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	231	167
Commercial real estate | Total Acquired Loans | Other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,245	727
Commercial real estate | Total Acquired Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,432	1,480
Total	1,432	1,480
90 days and accruing	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	1,329,611	1,302,941
Residential real estate | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	232,245	241,256
Residential real estate | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,097,366	1,061,685
Residential real estate | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,277,676	1,244,514
Total	1,283,685	1,251,852
90 days and accruing	0	0
Nonaccrual	8,725	7,645
Residential real estate | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,237	4,198
Residential real estate | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,772	3,140
Residential real estate | Originated Loans and Leases | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	206,419	211,319
Total	207,820	212,812
90 days and accruing	0	0
Nonaccrual	1,300	1,537
Residential real estate | Originated Loans and Leases | Home equity | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	835	1,045
Residential real estate | Originated Loans and Leases | Home equity | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	566	448
Residential real estate | Originated Loans and Leases | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,071,257	1,033,195
Total	1,075,865	1,039,040
90 days and accruing	0	0
Nonaccrual	7,425	6,108
Residential real estate | Originated Loans and Leases | Mortgages | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,402	3,153
Residential real estate | Originated Loans and Leases | Mortgages | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,206	2,692
Residential real estate | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	44,040	48,510
Total	45,926	51,089
90 days and accruing	483	570
Nonaccrual	2,418	2,718
Residential real estate | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	874	1,073
Residential real estate | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,012	1,506
Residential real estate | Total Acquired Loans | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	23,764	27,279
Total	24,425	28,444
90 days and accruing	61	130
Nonaccrual	1,130	1,604
Residential real estate | Total Acquired Loans | Home equity | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	320	601
Residential real estate | Total Acquired Loans | Home equity | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	341	564
Residential real estate | Total Acquired Loans | Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	20,276	21,231
Total	21,501	22,645
90 days and accruing	422	440
Nonaccrual	1,288	1,114
Residential real estate | Total Acquired Loans | Mortgages | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	554	472
Residential real estate | Total Acquired Loans | Mortgages | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	671	942
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	65,085	63,123
Consumer and other | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	53,034	50,979
Consumer and other | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	12,051	12,144
Consumer and other | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	63,159	61,532
Total	64,179	62,358
90 days and accruing	0	44
Nonaccrual	350	354
Consumer and other | Originated Loans and Leases | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	871	579
Consumer and other | Originated Loans and Leases | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	149	247
Consumer and other | Originated Loans and Leases | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	51,478	50,042
Total	52,128	50,214
90 days and accruing	0	38
Nonaccrual	139	76
Consumer and other | Originated Loans and Leases | Other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	587	130
Consumer and other | Originated Loans and Leases | Other | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	63	42
Consumer and other | Originated Loans and Leases | Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	11,681	11,490
Total	12,051	12,144
90 days and accruing	0	6
Nonaccrual	211	278
Consumer and other | Originated Loans and Leases | Indirect | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	284	449
Consumer and other | Originated Loans and Leases | Indirect | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	86	205
Consumer and other | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	903	761
Total	906	765
90 days and accruing	0	0
Nonaccrual	0	0
Consumer and other | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3	4
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, Recorded Investment, Past Due [Line Items]
Current Loans	903	761
Total	906	765
90 days and accruing	0	0
Nonaccrual	0	0
Consumer and other | Total Acquired Loans | Other | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3	4
Consumer and other | Total Acquired Loans | Other | 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	14,461	14,467
Leases | Originated Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	14,461	14,467
Total	14,461	14,467
90 days and accruing	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
Covered loans | Total Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans		0
Total	$ 0	0
90 days and accruing		0
Nonaccrual		0
Covered loans | Total Acquired Loans | 30-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		0
Covered loans | Total Acquired Loans | 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 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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Recorded Investment in financing receivables that are past due at the balance sheet 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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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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