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Allowance for Credit Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases, net of unearned income and deferred costs and fees	$ 5,434,860	$ 5,268,911
Commercial and industrial | Commercial, industrial, real estate, consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	83,753	124,190
One year before current fiscal year	97,291	80,099
Two years before current fiscal year	70,625	39,021
Three years before current fiscal year	30,669	41,711
Four years before current fiscal year	36,690	34,242
Prior	152,139	157,921
Revolving Loans Amortized Cost Basis	219,242	222,050
Revolving Loans Converted to Term	5,036	6,466
Total loans and leases, net of unearned income and deferred costs and fees	695,445	705,700
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Commercial and industrial | Commercial, industrial, real estate, consumer and other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	83,753	124,190
One year before current fiscal year	97,245	79,861
Two years before current fiscal year	70,435	38,158
Three years before current fiscal year	29,914	41,391
Four years before current fiscal year	36,570	33,238
Prior	149,820	156,038
Revolving Loans Amortized Cost Basis	212,932	215,890
Revolving Loans Converted to Term	5,036	6,466
Total loans and leases, net of unearned income and deferred costs and fees	685,705	695,232
Commercial and industrial | Commercial, industrial, real estate, consumer and other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	46	127
Two years before current fiscal year	104	421
Three years before current fiscal year	395	285
Four years before current fiscal year	96	271
Prior	1,521	1,380
Revolving Loans Amortized Cost Basis	638	501
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	2,800	2,985
Commercial and industrial | Commercial, industrial, real estate, consumer and other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	111
Two years before current fiscal year	86	442
Three years before current fiscal year	360	35
Four years before current fiscal year	24	733
Prior	798	503
Revolving Loans Amortized Cost Basis	5,672	5,659
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	6,940	7,483
Commercial and industrial | PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	416
Two years before current fiscal year	323	340
Three years before current fiscal year	165	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	488	756
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Commercial and industrial | PPP loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	416
Two years before current fiscal year	323	340
Three years before current fiscal year	165	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	488	756
Commercial and industrial | PPP loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	0	0
Commercial and industrial | PPP loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	0	0
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	15,612	16,694
One year before current fiscal year	12,772	4,178
Two years before current fiscal year	3,305	5,015
Three years before current fiscal year	3,629	4,186
Four years before current fiscal year	3,415	7,734
Prior	8,511	4,899
Revolving Loans Amortized Cost Basis	29,819	42,152
Revolving Loans Converted to Term	657	215
Total loans and leases, net of unearned income and deferred costs and fees	77,720	85,073
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Commercial and industrial | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	15,612	16,694
One year before current fiscal year	12,772	4,120
Two years before current fiscal year	3,037	4,944
Three years before current fiscal year	3,569	4,186
Four years before current fiscal year	3,415	7,734
Prior	8,501	4,883
Revolving Loans Amortized Cost Basis	29,767	42,097
Revolving Loans Converted to Term	657	215
Total loans and leases, net of unearned income and deferred costs and fees	77,330	84,873
Commercial and industrial | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	58
Two years before current fiscal year	268	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	49	50
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	317	108
Commercial and industrial | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	71
Three years before current fiscal year	60	0
Four years before current fiscal year	0	0
Prior	10	16
Revolving Loans Amortized Cost Basis	3	5
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	73	92
Commercial real estate | Commercial, industrial, real estate, consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	134,025	343,032
One year before current fiscal year	336,051	370,620
Two years before current fiscal year	372,115	313,295
Three years before current fiscal year	313,411	294,443
Four years before current fiscal year	290,547	207,263
Prior	1,023,984	873,145
Revolving Loans Amortized Cost Basis	19,052	11,038
Revolving Loans Converted to Term	17,979	24,503
Total loans and leases, net of unearned income and deferred costs and fees	2,507,164	2,437,339
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Commercial real estate | Commercial, industrial, real estate, consumer and other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	134,025	342,311
One year before current fiscal year	320,115	367,104
Two years before current fiscal year	369,981	311,607
Three years before current fiscal year	309,691	279,587
Four years before current fiscal year	276,956	203,016
Prior	949,655	812,563
Revolving Loans Amortized Cost Basis	17,618	10,906
Revolving Loans Converted to Term	17,979	24,503
Total loans and leases, net of unearned income and deferred costs and fees	2,396,020	2,351,597
Commercial real estate | Commercial, industrial, real estate, consumer and other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	643
One year before current fiscal year	636	3,406
Two years before current fiscal year	2,027	1,688
Three years before current fiscal year	3,720	11,462
Four years before current fiscal year	11,062	2,555
Prior	43,986	25,361
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	61,431	45,115
Commercial real estate | Commercial, industrial, real estate, consumer and other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	78
One year before current fiscal year	15,300	110
Two years before current fiscal year	107	0
Three years before current fiscal year	0	3,394
Four years before current fiscal year	2,529	1,692
Prior	30,343	35,221
Revolving Loans Amortized Cost Basis	1,434	132
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	49,713	40,627
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	9,083	33,241
One year before current fiscal year	38,097	24,125
Two years before current fiscal year	23,213	22,831
Three years before current fiscal year	21,453	26,163
Four years before current fiscal year	24,691	37,873
Prior	96,518	66,364
Revolving Loans Amortized Cost Basis	2,413	3,131
Revolving Loans Converted to Term	2,676	1,235
Total loans and leases, net of unearned income and deferred costs and fees	218,144	214,963
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Commercial real estate | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	9,083	33,241
One year before current fiscal year	38,097	24,125
Two years before current fiscal year	23,213	22,831
Three years before current fiscal year	21,453	25,576
Four years before current fiscal year	24,133	37,835
Prior	95,410	65,112
Revolving Loans Amortized Cost Basis	2,413	3,131
Revolving Loans Converted to Term	2,676	1,235
Total loans and leases, net of unearned income and deferred costs and fees	216,478	213,086
Commercial real estate | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	401
Four years before current fiscal year	384	0
Prior	1,061	1,142
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	1,445	1,543
Commercial real estate | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	186
Four years before current fiscal year	174	38
Prior	47	110
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	221	334
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	23,105
One year before current fiscal year	2,821	75,245
Two years before current fiscal year	9,731	27,584
Three years before current fiscal year	2,524	14,842
Four years before current fiscal year	468	9,083
Prior	1,129	7,268
Revolving Loans Amortized Cost Basis	250,483	42,701
Revolving Loans Converted to Term	3,805	1,288
Total loans and leases, net of unearned income and deferred costs and fees	270,961	201,116
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Commercial real estate | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	23,105
One year before current fiscal year	2,821	75,245
Two years before current fiscal year	9,731	27,584
Three years before current fiscal year	2,524	14,842
Four years before current fiscal year	468	9,083
Prior	1,129	7,268
Revolving Loans Amortized Cost Basis	250,483	42,701
Revolving Loans Converted to Term	3,805	1,288
Total loans and leases, net of unearned income and deferred costs and fees	270,961	201,116
Commercial real estate | Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	0	0
Commercial real estate | Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	0	0
Residential Real Estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	1,729	3,030
One year before current fiscal year	2,164	1,062
Two years before current fiscal year	939	637
Three years before current fiscal year	557	1,006
Four years before current fiscal year	864	792
Prior	8,971	3,208
Revolving Loans Amortized Cost Basis	166,539	177,803
Revolving Loans Converted to Term	5,624	1,085
Total loans and leases, net of unearned income and deferred costs and fees	187,387	188,623
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	2
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	2
Residential Real Estate | Home equity | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	1,729	3,030
One year before current fiscal year	2,164	1,062
Two years before current fiscal year	939	637
Three years before current fiscal year	557	992
Four years before current fiscal year	864	792
Prior	8,640	3,183
Revolving Loans Amortized Cost Basis	163,758	175,451
Revolving Loans Converted to Term	5,624	1,085
Total loans and leases, net of unearned income and deferred costs and fees	184,275	186,232
Residential Real Estate | Home equity | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	14
Four years before current fiscal year	0	0
Prior	331	25
Revolving Loans Amortized Cost Basis	2,781	2,352
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	3,112	2,391
Residential Real Estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	99,637	187,347
One year before current fiscal year	189,415	272,570
Two years before current fiscal year	260,725	240,212
Three years before current fiscal year	227,140	118,073
Four years before current fiscal year	112,275	68,157
Prior	479,100	459,959
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	1,368,292	1,346,318
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Residential Real Estate | Mortgages | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	99,637	187,129
One year before current fiscal year	188,901	272,235
Two years before current fiscal year	260,395	239,584
Three years before current fiscal year	225,960	117,391
Four years before current fiscal year	111,379	66,605
Prior	468,208	452,221
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	1,354,480	1,335,165
Residential Real Estate | Mortgages | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	218
One year before current fiscal year	514	335
Two years before current fiscal year	330	628
Three years before current fiscal year	1,180	682
Four years before current fiscal year	896	1,552
Prior	10,892	7,738
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	13,812	11,153
Consumer and Other | Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	47,097	31,243
One year before current fiscal year	14,100	13,999
Two years before current fiscal year	12,174	7,375
Three years before current fiscal year	5,888	6,231
Four years before current fiscal year	4,497	4,462
Prior	10,722	8,029
Revolving Loans Amortized Cost Basis	2,687	4,073
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	97,165	75,412
Current-period gross writeoffs
2023	406
2022	8
2021	0
2020	17
2019	38
Prior	14
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	483
Consumer and Other | Direct | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	47,087	31,243
One year before current fiscal year	14,091	13,999
Two years before current fiscal year	12,163	7,372
Three years before current fiscal year	5,884	6,138
Four years before current fiscal year	4,382	4,386
Prior	10,589	8,029
Revolving Loans Amortized Cost Basis	2,676	4,070
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	96,872	75,237
Consumer and Other | Direct | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	10	0
One year before current fiscal year	9	0
Two years before current fiscal year	11	3
Three years before current fiscal year	4	93
Four years before current fiscal year	115	76
Prior	133	0
Revolving Loans Amortized Cost Basis	11	3
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	293	175
Consumer and Other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	156
Two years before current fiscal year	112	146
Three years before current fiscal year	82	1,168
Four years before current fiscal year	577	645
Prior	319	109
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	1,090	2,224
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	49
Prior	14
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	63
Consumer and Other | Indirect | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	156
Two years before current fiscal year	112	146
Three years before current fiscal year	82	1,092
Four years before current fiscal year	522	635
Prior	307	101
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	1,023	2,130
Consumer and Other | Indirect | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	76
Four years before current fiscal year	55	10
Prior	12	8
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total loans and leases, net of unearned income and deferred costs and fees	$ 67	$ 94

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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-Topic 326
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