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Loans - Collateral-dependent Loans by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 3,772,866	$ 3,788,645
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	28,281	28,459
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	19,919	20,749
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,314	1,575
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	242	272
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,806	5,863
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	608,870	620,106
Commercial and Industrial Loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,086	9,420
Commercial and Industrial Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,079	2,078
Commercial and Industrial Loans | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	962	1,219
Commercial and Industrial Loans | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	242	272
Commercial and Industrial Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,803	5,851
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,000,237	1,966,884
Commercial Real Estate Loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,648	12,228
Commercial Real Estate Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,612	12,192
Commercial Real Estate Loans | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	36	36
Commercial Real Estate Loans | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Commercial Real Estate Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	378,587	417,413
Agricultural Loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,128	5,262
Agricultural Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,816	4,944
Agricultural Loans | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	312	318
Agricultural Loans | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Agricultural Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	58,436	56,396
Leases | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Leases | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	277,576	279,748
Home Equity Loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	530	467
Home Equity Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	530	467
Home Equity Loans | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Home Equity Loans | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Home Equity Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	80,502	79,904
Consumer Loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	15	22
Consumer Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8	8
Consumer Loans | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4	2
Consumer Loans | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3	12
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	18,320	17,512
Credit Cards | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Credit Cards | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Credit Cards | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Credit Cards | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Credit Cards | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	350,338	350,682
Residential Mortgage Loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	874	1,060
Residential Mortgage Loans | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	874	1,060
Residential Mortgage Loans | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Residential Mortgage Loans | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Residential Mortgage Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0	$ 0

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Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6378536&loc=d3e10095-111533

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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