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Allowance for Credit Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 5,273,671	$ 5,268,911
Commercial and industrial | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	16,897	124,190
One year before current fiscal year	113,621	80,099
Two years before current fiscal year	80,828	39,021
Three years before current fiscal year	37,187	41,711
Four years before current fiscal year	44,427	34,242
Prior	170,084	157,921
Revolving Loans Amortized Cost Basis	208,890	222,050
Revolving Loans Converted to Term	1,170	6,466
Total Loans	673,104	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 and industrial other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	16,897	124,190
One year before current fiscal year	113,621	79,861
Two years before current fiscal year	80,606	38,158
Three years before current fiscal year	36,432	41,391
Four years before current fiscal year	44,230	33,238
Prior	167,183	156,038
Revolving Loans Amortized Cost Basis	203,174	215,890
Revolving Loans Converted to Term	1,170	6,466
Total Loans	663,313	695,232
Commercial and industrial | Commercial and industrial other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	127
Two years before current fiscal year	120	421
Three years before current fiscal year	338	285
Four years before current fiscal year	132	271
Prior	1,339	1,380
Revolving Loans Amortized Cost Basis	800	501
Revolving Loans Converted to Term	0	0
Total Loans	2,729	2,985
Commercial and industrial | Commercial and industrial 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	102	442
Three years before current fiscal year	417	35
Four years before current fiscal year	65	733
Prior	1,562	503
Revolving Loans Amortized Cost Basis	4,916	5,659
Revolving Loans Converted to Term	0	0
Total Loans	7,062	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	383	340
Three years before current fiscal year	303	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	686	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	383	340
Three years before current fiscal year	303	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	686	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	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	0	0
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,152	16,694
One year before current fiscal year	15,034	4,178
Two years before current fiscal year	4,455	5,015
Three years before current fiscal year	4,229	4,186
Four years before current fiscal year	3,479	7,734
Prior	12,105	4,899
Revolving Loans Amortized Cost Basis	23,769	42,152
Revolving Loans Converted to Term	0	215
Total Loans	65,223	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	2,152	16,694
One year before current fiscal year	15,034	4,120
Two years before current fiscal year	4,399	4,944
Three years before current fiscal year	4,162	4,186
Four years before current fiscal year	3,479	7,734
Prior	12,092	4,883
Revolving Loans Amortized Cost Basis	23,745	42,097
Revolving Loans Converted to Term	0	215
Total Loans	65,063	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	56	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	20	50
Revolving Loans Converted to Term	0	0
Total Loans	76	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	67	0
Four years before current fiscal year	0	0
Prior	13	16
Revolving Loans Amortized Cost Basis	4	5
Revolving Loans Converted to Term	0	0
Total Loans	84	92
Commercial real estate | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	39,210	343,032
One year before current fiscal year	341,321	370,620
Two years before current fiscal year	367,594	313,295
Three years before current fiscal year	319,673	294,443
Four years before current fiscal year	292,899	207,263
Prior	1,077,861	873,145
Revolving Loans Amortized Cost Basis	35,918	11,038
Revolving Loans Converted to Term	2,056	24,503
Total Loans	2,476,532	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 and industrial other | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	39,210	342,311
One year before current fiscal year	340,604	367,104
Two years before current fiscal year	367,485	311,607
Three years before current fiscal year	317,991	279,587
Four years before current fiscal year	278,372	203,016
Prior	1,021,145	812,563
Revolving Loans Amortized Cost Basis	35,794	10,906
Revolving Loans Converted to Term	2,056	24,503
Total Loans	2,402,657	2,351,597
Commercial real estate | Commercial and industrial other | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	643
One year before current fiscal year	643	3,406
Two years before current fiscal year	0	1,688
Three years before current fiscal year	1,682	11,462
Four years before current fiscal year	11,380	2,555
Prior	21,234	25,361
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	34,939	45,115
Commercial real estate | Commercial and industrial other | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	78
One year before current fiscal year	74	110
Two years before current fiscal year	109	0
Three years before current fiscal year	0	3,394
Four years before current fiscal year	3,147	1,692
Prior	35,482	35,221
Revolving Loans Amortized Cost Basis	124	132
Revolving Loans Converted to Term	0	0
Total Loans	38,936	40,627
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,578	33,241
One year before current fiscal year	34,652	24,125
Two years before current fiscal year	23,976	22,831
Three years before current fiscal year	22,525	26,163
Four years before current fiscal year	25,472	37,873
Prior	101,203	66,364
Revolving Loans Amortized Cost Basis	2,158	3,131
Revolving Loans Converted to Term	1,450	1,235
Total Loans	214,014	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	2,578	33,241
One year before current fiscal year	34,652	24,125
Two years before current fiscal year	23,976	22,831
Three years before current fiscal year	22,525	25,576
Four years before current fiscal year	24,893	37,835
Prior	100,038	65,112
Revolving Loans Amortized Cost Basis	2,158	3,131
Revolving Loans Converted to Term	1,450	1,235
Total Loans	212,270	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	396	0
Prior	1,115	1,142
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,511	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	183	38
Prior	50	110
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	233	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	30,152	75,245
Two years before current fiscal year	73,446	27,584
Three years before current fiscal year	17,738	14,842
Four years before current fiscal year	11,859	9,083
Prior	16,312	7,268
Revolving Loans Amortized Cost Basis	62,168	42,701
Revolving Loans Converted to Term	8,114	1,288
Total Loans	219,789	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	30,152	75,245
Two years before current fiscal year	73,446	27,584
Three years before current fiscal year	17,738	14,842
Four years before current fiscal year	11,859	9,083
Prior	16,312	7,268
Revolving Loans Amortized Cost Basis	62,168	42,701
Revolving Loans Converted to Term	8,114	1,288
Total Loans	219,789	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	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	0	0
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	499	3,030
One year before current fiscal year	2,357	1,062
Two years before current fiscal year	1,033	637
Three years before current fiscal year	610	1,006
Four years before current fiscal year	953	792
Prior	10,877	3,208
Revolving Loans Amortized Cost Basis	166,990	177,803
Revolving Loans Converted to Term	317	1,085
Total Loans	183,636	188,623
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	2
Prior	0
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	499	3,030
One year before current fiscal year	2,357	1,062
Two years before current fiscal year	1,033	637
Three years before current fiscal year	610	992
Four years before current fiscal year	953	792
Prior	10,589	3,183
Revolving Loans Amortized Cost Basis	164,730	175,451
Revolving Loans Converted to Term	317	1,085
Total Loans	181,088	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	288	25
Revolving Loans Amortized Cost Basis	2,260	2,352
Revolving Loans Converted to Term	0	0
Total Loans	2,548	2,391
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	15,811	187,347
One year before current fiscal year	192,324	272,570
Two years before current fiscal year	269,743	240,212
Three years before current fiscal year	236,051	118,073
Four years before current fiscal year	116,715	68,157
Prior	511,570	459,959
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,342,214	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	15,811	187,129
One year before current fiscal year	192,106	272,235
Two years before current fiscal year	269,413	239,584
Three years before current fiscal year	235,432	117,391
Four years before current fiscal year	116,045	66,605
Prior	501,085	452,221
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,329,892	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	218	335
Two years before current fiscal year	330	628
Three years before current fiscal year	619	682
Four years before current fiscal year	670	1,552
Prior	10,485	7,738
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	12,322	11,153
Consumer and other | Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	26,213	31,243
One year before current fiscal year	16,366	13,999
Two years before current fiscal year	13,338	7,375
Three years before current fiscal year	6,844	6,231
Four years before current fiscal year	5,825	4,462
Prior	11,981	8,029
Revolving Loans Amortized Cost Basis	3,208	4,073
Revolving Loans Converted to Term	0	0
Total Loans	83,775	75,412
Current-period gross writeoffs
2023	33
2022	0
2021	0
2020	14
2019	3
Prior	20
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	70
Consumer and other | Direct | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	26,213	31,243
One year before current fiscal year	16,366	13,999
Two years before current fiscal year	13,338	7,372
Three years before current fiscal year	6,844	6,138
Four years before current fiscal year	5,762	4,386
Prior	11,873	8,029
Revolving Loans Amortized Cost Basis	3,205	4,070
Revolving Loans Converted to Term	0	0
Total Loans	83,601	75,237
Consumer and other | Direct | 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	3
Three years before current fiscal year	0	93
Four years before current fiscal year	63	76
Prior	108	0
Revolving Loans Amortized Cost Basis	3	3
Revolving Loans Converted to Term	0	0
Total Loans	174	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	139	146
Three years before current fiscal year	127	1,168
Four years before current fiscal year	940	645
Prior	577	109
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,783	2,224
Current-period gross writeoffs
2023	0
2022	0
2021	0
2020	0
2019	5
Prior	31
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	36
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	139	146
Three years before current fiscal year	127	1,092
Four years before current fiscal year	885	635
Prior	554	101
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,705	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	23	8
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	$ 78	$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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