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Loans and Leases - Schedule of Age Analysis of Past Due Loans, Segregated by Originated and Acquired Loan and Lease Portfolios and by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total	$ 4,860,898	$ 4,837,735
Less: unearned income and deferred costs and fees, Past due	(3,825)	(3,796)
Total loans and leases, net of unearned income and deferred costs and fees	4,857,073	4,833,939
Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	4,617,920	4,556,048
Total	4,632,441	4,572,537
90 days and accruing	0	0
Nonaccrual	21,404	19,340
Less: unearned income and deferred costs and fees, Past due	(3,825)	(3,796)
Less: unearned income and deferred costs and fees, Current Loans	(3,825)	(3,796)
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	4,628,616	4,568,741
Total originated loans and leases, net of unearned income and deferred costs and fees, Current Loans	4,614,095	4,552,252
Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	3,287	7,838
Less: unearned income and deferred costs and fees, Past due	0	0
Total loans and leases, net of unearned income and deferred costs and fees	3,287	7,838
Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	11,234	8,651
Less: unearned income and deferred costs and fees, Past due	0	0
Total loans and leases, net of unearned income and deferred costs and fees	11,234	8,651
Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	226,107	262,510
Total	228,457	265,198
90 days and accruing	1,219	1,316
Nonaccrual	2,164	2,856
Less: unearned income and deferred costs and fees, Past due	0	0
Total loans and leases, net of unearned income and deferred costs and fees	228,457	265,198
Acquired Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	232	67
Acquired Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2,118	2,621
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	994,505	1,077,635
Commercial and industrial | Agriculture
Financing Receivable, Past Due [Line Items]
Total	94,302	107,494
Commercial and industrial | Consumer Other
Financing Receivable, Past Due [Line Items]
Total	900,203	970,141
Commercial and industrial | Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	953,497	1,029,897
Total	954,734	1,033,923
90 days and accruing	0	0
Nonaccrual	1,707	1,861
Commercial and industrial | Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	200	2,367
Commercial and industrial | Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	1,037	1,659
Commercial and industrial | Originated Loans and Leases | Agriculture
Financing Receivable, Past Due [Line Items]
Current Loans	94,302	107,494
Total	94,302	107,494
90 days and accruing	0	0
Nonaccrual	0	0
Commercial and industrial | Originated Loans and Leases | Agriculture | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial and industrial | Originated Loans and Leases | Agriculture | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial and industrial | Originated Loans and Leases | Consumer Other
Financing Receivable, Past Due [Line Items]
Current Loans	859,195	922,403
Total	860,432	926,429
90 days and accruing	0	0
Nonaccrual	1,707	1,861
Commercial and industrial | Originated Loans and Leases | Consumer Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	200	2,367
Commercial and industrial | Originated Loans and Leases | Consumer Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	1,037	1,659
Commercial and industrial | Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	39,769	43,702
Total	39,771	43,712
90 days and accruing	2	10
Nonaccrual	45	22
Commercial and industrial | Acquired Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial and industrial | Acquired Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2	10
Commercial and industrial | Acquired Loans and Leases | Agriculture
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial and industrial | Acquired Loans and Leases | Consumer Other
Financing Receivable, Past Due [Line Items]
Current Loans	39,769	43,702
Total	39,771	43,712
90 days and accruing	2	10
Nonaccrual	45	22
Commercial and industrial | Acquired Loans and Leases | Consumer Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial and industrial | Acquired Loans and Leases | Consumer Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2	10
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,426,770	2,340,661
Commercial real estate | Agriculture
Financing Receivable, Past Due [Line Items]
Total	180,593	170,229
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total	192,015	165,669
Commercial real estate | Consumer Other
Financing Receivable, Past Due [Line Items]
Total	2,054,162	2,004,763
Commercial real estate | Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	2,268,920	2,158,441
Total	2,273,981	2,161,569
90 days and accruing	0	0
Nonaccrual	10,329	7,691
Commercial real estate | Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	426	1,272
Commercial real estate | Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	4,635	1,856
Commercial real estate | Originated Loans and Leases | Agriculture
Financing Receivable, Past Due [Line Items]
Current Loans	180,169	169,934
Total	180,385	170,005
90 days and accruing	0	0
Nonaccrual	0	0
Commercial real estate | Originated Loans and Leases | Agriculture | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	216	71
Commercial real estate | Originated Loans and Leases | Agriculture | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Originated Loans and Leases | Construction
Financing Receivable, Past Due [Line Items]
Current Loans	190,447	164,285
Total	190,657	164,285
90 days and accruing	0	0
Nonaccrual	0	0
Commercial real estate | Originated Loans and Leases | Construction | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	210	0
Commercial real estate | Originated Loans and Leases | Construction | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Originated Loans and Leases | Consumer Other
Financing Receivable, Past Due [Line Items]
Current Loans	1,898,304	1,824,222
Total	1,902,939	1,827,279
90 days and accruing	0	0
Nonaccrual	10,329	7,691
Commercial real estate | Originated Loans and Leases | Consumer Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	1,201
Commercial real estate | Originated Loans and Leases | Consumer Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	4,635	1,856
Commercial real estate | Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	152,069	178,253
Total	152,789	179,092
90 days and accruing	564	525
Nonaccrual	289	316
Commercial real estate | Acquired Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Acquired Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	720	839
Commercial real estate | Acquired Loans and Leases | Agriculture
Financing Receivable, Past Due [Line Items]
Current Loans	208	224
Total	208	224
90 days and accruing	0	0
Nonaccrual	0	0
Commercial real estate | Acquired Loans and Leases | Agriculture | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Acquired Loans and Leases | Agriculture | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Acquired Loans and Leases | Construction
Financing Receivable, Past Due [Line Items]
Current Loans	1,358	1,384
Total	1,358	1,384
90 days and accruing	0	0
Nonaccrual	0	0
Commercial real estate | Acquired Loans and Leases | Construction | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Acquired Loans and Leases | Construction | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Acquired Loans and Leases | Consumer Other
Financing Receivable, Past Due [Line Items]
Current Loans	150,503	176,645
Total	151,223	177,484
90 days and accruing	564	525
Nonaccrual	289	316
Commercial real estate | Acquired Loans and Leases | Consumer Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Commercial real estate | Acquired Loans and Leases | Consumer Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	720	839
Residential real estate
Financing Receivable, Past Due [Line Items]
Total	1,347,320	1,333,894
Residential real estate | Home equity
Financing Receivable, Past Due [Line Items]
Total	221,538	229,608
Residential real estate | Mortgages
Financing Receivable, Past Due [Line Items]
Total	1,125,782	1,104,286
Residential real estate | Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	1,304,468	1,283,529
Total	1,312,197	1,292,261
90 days and accruing	0	0
Nonaccrual	9,119	9,554
Residential real estate | Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	2,339	3,679
Residential real estate | Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	5,390	5,053
Residential real estate | Originated Loans and Leases | Home equity
Financing Receivable, Past Due [Line Items]
Current Loans	203,099	206,447
Total	205,050	208,459
90 days and accruing	0	0
Nonaccrual	1,859	1,784
Residential real estate | Originated Loans and Leases | Home equity | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	725	986
Residential real estate | Originated Loans and Leases | Home equity | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	1,226	1,026
Residential real estate | Originated Loans and Leases | Mortgages
Financing Receivable, Past Due [Line Items]
Current Loans	1,101,369	1,077,082
Total	1,107,147	1,083,802
90 days and accruing	0	0
Nonaccrual	7,260	7,770
Residential real estate | Originated Loans and Leases | Mortgages | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	1,614	2,693
Residential real estate | Originated Loans and Leases | Mortgages | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	4,164	4,027
Residential real estate | Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	33,495	39,797
Total	35,123	41,633
90 days and accruing	653	781
Nonaccrual	1,830	2,518
Residential real estate | Acquired Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	232	64
Residential real estate | Acquired Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	1,396	1,772
Residential real estate | Acquired Loans and Leases | Home equity
Financing Receivable, Past Due [Line Items]
Current Loans	16,005	20,300
Total	16,488	21,149
90 days and accruing	57	59
Nonaccrual	923	1,414
Residential real estate | Acquired Loans and Leases | Home equity | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	212	46
Residential real estate | Acquired Loans and Leases | Home equity | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	271	803
Residential real estate | Acquired Loans and Leases | Mortgages
Financing Receivable, Past Due [Line Items]
Current Loans	17,490	19,497
Total	18,635	20,484
90 days and accruing	596	722
Nonaccrual	907	1,104
Residential real estate | Acquired Loans and Leases | Mortgages | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	20	18
Residential real estate | Acquired Loans and Leases | Mortgages | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	1,125	969
Consumer and other
Financing Receivable, Past Due [Line Items]
Total	75,174	70,989
Consumer and other | Consumer Other
Financing Receivable, Past Due [Line Items]
Total	61,563	58,326
Consumer and other | Indirect
Financing Receivable, Past Due [Line Items]
Total	13,611	12,663
Consumer and other | Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	73,906	69,625
Total	74,400	70,228
90 days and accruing	0	0
Nonaccrual	249	234
Consumer and other | Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	322	520
Consumer and other | Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	172	83
Consumer and other | Originated Loans and Leases | Consumer Other
Financing Receivable, Past Due [Line Items]
Current Loans	60,613	57,354
Total	60,789	57,565
90 days and accruing	0	0
Nonaccrual	104	79
Consumer and other | Originated Loans and Leases | Consumer Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	100	187
Consumer and other | Originated Loans and Leases | Consumer Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	76	24
Consumer and other | Originated Loans and Leases | Indirect
Financing Receivable, Past Due [Line Items]
Current Loans	13,293	12,271
Total	13,611	12,663
90 days and accruing	0	0
Nonaccrual	145	155
Consumer and other | Originated Loans and Leases | Indirect | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	222	333
Consumer and other | Originated Loans and Leases | Indirect | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	96	59
Consumer and other | Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	774	758
Total	774	761
90 days and accruing	0	0
Nonaccrual	0	0
Consumer and other | Acquired Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	3
Consumer and other | Acquired Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Consumer and other | Acquired Loans and Leases | Consumer Other
Financing Receivable, Past Due [Line Items]
Current Loans	774	758
Total	774	761
90 days and accruing	0	0
Nonaccrual	0	0
Consumer and other | Acquired Loans and Leases | Consumer Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	3
Consumer and other | Acquired Loans and Leases | Consumer Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Consumer and other | Acquired Loans and Leases | Indirect
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases
Financing Receivable, Past Due [Line Items]
Total	17,129	14,556
Leases | Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	17,129	14,556
Total	17,129	14,556
90 days and accruing	0	0
Nonaccrual	0	0
Leases | Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Leases | Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Leases | Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Total	$ 0	$ 0

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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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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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