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Loans and Leases - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total Loans	$ 4,921,195	$ 4,837,735
Less: unearned income and deferred costs and fees	(3,645)	(3,796)
Total originated loans and leases, net of unearned income and deferred costs and fees	4,917,550	4,833,939
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans	1,008,061	1,077,635
Commercial and industrial | Agriculture
Financing Receivable, Past Due [Line Items]
Total Loans	105,786	107,494
Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Total Loans	902,275	970,141
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans	2,443,565	2,340,661
Commercial real estate | Agriculture
Financing Receivable, Past Due [Line Items]
Total Loans	184,898	170,229
Commercial real estate | Other
Financing Receivable, Past Due [Line Items]
Total Loans	2,045,030	2,004,763
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total Loans	213,637	165,669
Residential real estate
Financing Receivable, Past Due [Line Items]
Total Loans	1,377,837	1,333,894
Residential real estate | Home equity
Financing Receivable, Past Due [Line Items]
Total Loans	219,245	229,608
Residential real estate | Mortgages
Financing Receivable, Past Due [Line Items]
Total Loans	1,158,592	1,104,286
Consumer and other
Financing Receivable, Past Due [Line Items]
Total Loans	74,410	70,989
Consumer and other | Other
Financing Receivable, Past Due [Line Items]
Total Loans	61,446	58,326
Consumer and other | Indirect
Financing Receivable, Past Due [Line Items]
Total Loans	12,964	12,663
Leases
Financing Receivable, Past Due [Line Items]
Total Loans	17,322	14,556
Originated Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	4,681,206	4,556,048
Total Loans	4,701,046	4,572,537
90 days and accruing	0	0
Nonaccrual	22,485	19,340
Less: unearned income and deferred costs and fees	(3,645)	(3,796)
Less: unearned income and deferred costs and fees, current	(3,645)	(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 originated loans and leases, net of unearned income and deferred costs and fees	4,697,401	4,568,741
Total originated loans and leases, net of unearned income and deferred costs and fees, current	4,677,561	4,552,252
Originated Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	3,559	7,838
Less: unearned income and deferred costs and fees	0	0
Total originated loans and leases, net of unearned income and deferred costs and fees	3,559	7,838
Originated Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	16,281	8,651
Less: unearned income and deferred costs and fees	0	0
Total originated loans and leases, net of unearned income and deferred costs and fees	16,281	8,651
Originated Loans and Leases | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Current Loans	966,428	1,029,897
Total Loans	968,985	1,033,923
90 days and accruing	0	0
Nonaccrual	2,334	1,861
Originated Loans and Leases | Commercial and industrial | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	413	2,367
Originated Loans and Leases | Commercial and industrial | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2,144	1,659
Originated Loans and Leases | Commercial and industrial | Agriculture
Financing Receivable, Past Due [Line Items]
Current Loans	105,721	107,494
Total Loans	105,786	107,494
90 days and accruing	0	0
Nonaccrual	0	0
Originated Loans and Leases | Commercial and industrial | Agriculture | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Originated Loans and Leases | Commercial and industrial | Agriculture | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	65	0
Originated Loans and Leases | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Current Loans	860,707	922,403
Total Loans	863,199	926,429
90 days and accruing	0	0
Nonaccrual	2,334	1,861
Originated Loans and Leases | Commercial and industrial | Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	413	2,367
Originated Loans and Leases | Commercial and industrial | Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2,079	1,659
Originated Loans and Leases | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current Loans	2,285,437	2,158,441
Total Loans	2,296,648	2,161,569
90 days and accruing	0	0
Nonaccrual	10,617	7,691
Originated Loans and Leases | Commercial real estate | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	1,116	1,272
Originated Loans and Leases | Commercial real estate | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	10,095	1,856
Originated Loans and Leases | Commercial real estate | Agriculture
Financing Receivable, Past Due [Line Items]
Current Loans	184,701	169,934
Total Loans	184,701	170,005
90 days and accruing	0	0
Nonaccrual	0	0
Originated Loans and Leases | Commercial real estate | Agriculture | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	71
Originated Loans and Leases | Commercial real estate | Agriculture | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Originated Loans and Leases | Commercial real estate | Other
Financing Receivable, Past Due [Line Items]
Current Loans	1,888,434	1,824,222
Total Loans	1,899,645	1,827,279
90 days and accruing	0	0
Nonaccrual	10,617	7,691
Originated Loans and Leases | Commercial real estate | Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	1,116	1,201
Originated Loans and Leases | Commercial real estate | Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	10,095	1,856
Originated Loans and Leases | Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Current Loans	212,302	164,285
Total Loans	212,302	164,285
90 days and accruing	0	0
Nonaccrual	0	0
Originated Loans and Leases | Commercial real estate | Construction | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Originated Loans and Leases | Commercial real estate | Construction | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Originated Loans and Leases | Residential real estate
Financing Receivable, Past Due [Line Items]
Current Loans	1,338,999	1,283,529
Total Loans	1,344,466	1,292,261
90 days and accruing	0	0
Nonaccrual	9,259	9,554
Originated Loans and Leases | Residential real estate | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	1,551	3,679
Originated Loans and Leases | Residential real estate | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	3,916	5,053
Originated Loans and Leases | Residential real estate | Home equity
Financing Receivable, Past Due [Line Items]
Current Loans	203,002	206,447
Total Loans	203,894	208,459
90 days and accruing	0	0
Nonaccrual	1,924	1,784
Originated Loans and Leases | Residential real estate | Home equity | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	290	986
Originated Loans and Leases | Residential real estate | Home equity | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	602	1,026
Originated Loans and Leases | Residential real estate | Mortgages
Financing Receivable, Past Due [Line Items]
Current Loans	1,135,997	1,077,082
Total Loans	1,140,572	1,083,802
90 days and accruing	0	0
Nonaccrual	7,335	7,770
Originated Loans and Leases | Residential real estate | Mortgages | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	1,261	2,693
Originated Loans and Leases | Residential real estate | Mortgages | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	3,314	4,027
Originated Loans and Leases | Consumer and other
Financing Receivable, Past Due [Line Items]
Current Loans	73,020	69,625
Total Loans	73,625	70,228
90 days and accruing	0	0
Nonaccrual	275	234
Originated Loans and Leases | Consumer and other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	479	520
Originated Loans and Leases | Consumer and other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	126	83
Originated Loans and Leases | Consumer and other | Other
Financing Receivable, Past Due [Line Items]
Current Loans	60,428	57,354
Total Loans	60,661	57,565
90 days and accruing	0	0
Nonaccrual	158	79
Originated Loans and Leases | Consumer and other | Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	167	187
Originated Loans and Leases | Consumer and other | Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	66	24
Originated Loans and Leases | Consumer and other | Indirect
Financing Receivable, Past Due [Line Items]
Current Loans	12,592	12,271
Total Loans	12,964	12,663
90 days and accruing	0	0
Nonaccrual	117	155
Originated Loans and Leases | Consumer and other | Indirect | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	312	333
Originated Loans and Leases | Consumer and other | Indirect | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	60	59
Originated Loans and Leases | Leases
Financing Receivable, Past Due [Line Items]
Current Loans	17,322	14,556
Total Loans	17,322	14,556
90 days and accruing	0	0
Nonaccrual	0	0
Originated Loans and Leases | Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Originated Loans and Leases | Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases
Financing Receivable, Past Due [Line Items]
Current Loans	218,501	262,510
Total Loans	220,149	265,198
90 days and accruing	794	1,316
Nonaccrual	1,796	2,856
Less: unearned income and deferred costs and fees	0	0
Total originated loans and leases, net of unearned income and deferred costs and fees	220,149	265,198
Acquired Loans and Leases | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	165	67
Acquired Loans and Leases | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	1,483	2,621
Acquired Loans and Leases | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Current Loans	39,074	43,702
Total Loans	39,076	43,712
90 days and accruing	2	10
Nonaccrual	1	22
Acquired Loans and Leases | Commercial and industrial | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Commercial and industrial | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2	10
Acquired Loans and Leases | Commercial and industrial | Agriculture
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Acquired Loans and Leases | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Current Loans	39,074	43,702
Total Loans	39,076	43,712
90 days and accruing	2	10
Nonaccrual	1	22
Acquired Loans and Leases | Commercial and industrial | Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Commercial and industrial | Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	2	10
Acquired Loans and Leases | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current Loans	146,208	178,253
Total Loans	146,917	179,092
90 days and accruing	542	525
Nonaccrual	172	316
Acquired Loans and Leases | Commercial real estate | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	24	0
Acquired Loans and Leases | Commercial real estate | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	685	839
Acquired Loans and Leases | Commercial real estate | Agriculture
Financing Receivable, Past Due [Line Items]
Current Loans	197	224
Total Loans	197	224
90 days and accruing	0	0
Nonaccrual	0	0
Acquired Loans and Leases | Commercial real estate | Agriculture | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Commercial real estate | Agriculture | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Commercial real estate | Other
Financing Receivable, Past Due [Line Items]
Current Loans	144,676	176,645
Total Loans	145,385	177,484
90 days and accruing	542	525
Nonaccrual	172	316
Acquired Loans and Leases | Commercial real estate | Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	24	0
Acquired Loans and Leases | Commercial real estate | Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	685	839
Acquired Loans and Leases | Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Current Loans	1,335	1,384
Total Loans	1,335	1,384
90 days and accruing	0	0
Nonaccrual	0	0
Acquired Loans and Leases | Commercial real estate | Construction | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Commercial real estate | Construction | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Residential real estate
Financing Receivable, Past Due [Line Items]
Current Loans	32,434	39,797
Total Loans	33,371	41,633
90 days and accruing	250	781
Nonaccrual	1,623	2,518
Acquired Loans and Leases | Residential real estate | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	141	64
Acquired Loans and Leases | Residential real estate | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	796	1,772
Acquired Loans and Leases | Residential real estate | Home equity
Financing Receivable, Past Due [Line Items]
Current Loans	15,168	20,300
Total Loans	15,351	21,149
90 days and accruing	55	59
Nonaccrual	872	1,414
Acquired Loans and Leases | Residential real estate | Home equity | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	58	46
Acquired Loans and Leases | Residential real estate | Home equity | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	125	803
Acquired Loans and Leases | Residential real estate | Mortgages
Financing Receivable, Past Due [Line Items]
Current Loans	17,266	19,497
Total Loans	18,020	20,484
90 days and accruing	195	722
Nonaccrual	751	1,104
Acquired Loans and Leases | Residential real estate | Mortgages | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	83	18
Acquired Loans and Leases | Residential real estate | Mortgages | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	671	969
Acquired Loans and Leases | Consumer and other
Financing Receivable, Past Due [Line Items]
Current Loans	785	758
Total Loans	785	761
90 days and accruing	0	0
Nonaccrual	0	0
Acquired Loans and Leases | Consumer and other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	3
Acquired Loans and Leases | Consumer and other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Consumer and other | Other
Financing Receivable, Past Due [Line Items]
Current Loans	785	758
Total Loans	785	761
90 days and accruing	0	0
Nonaccrual	0	0
Acquired Loans and Leases | Consumer and other | Other | 30-89 days
Financing Receivable, Past Due [Line Items]
Past due	0	3
Acquired Loans and Leases | Consumer and other | Other | 90 days or more
Financing Receivable, Past Due [Line Items]
Past due	0	0
Acquired Loans and Leases | Consumer and other | Indirect
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Acquired Loans and Leases | Leases
Financing Receivable, Past Due [Line Items]
Total Loans	$ 0	$ 0

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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.

+ 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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