Loans and Leases, Credit Risk Rating Categories for Loans and Leases Held-for-Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	$ 3,427,133	$ 3,512,361
Allowance for credit losses	68,573	66,885	$ 61,032	$ 61,007
Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	3,398,905	3,482,530
Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	20,957	22,252
Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	7,271	7,579
Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Real Estate [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	2,552,615	2,601,543
Allowance for credit losses	42,813	43,085
Real Estate [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	2,529,900	2,578,045
Real Estate [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	15,833	16,426
Real Estate [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	6,882	7,072
Real Estate [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Commercial [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	1,304,439	1,320,314
Allowance for credit losses	24,253	18,055
Commercial [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	1,301,094	1,314,377
Commercial [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	2,958	5,535
Commercial [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	387	402
Commercial [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Agricultural [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	707,412	726,938
Allowance for credit losses	8,441	14,496
Agricultural [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	688,406	709,927
Agricultural [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	12,875	10,891
Agricultural [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	6,131	6,120
Agricultural [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Residential and Home Equity [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	387,370	387,753
Allowance for credit losses	7,334	7,508	6,759	2,847
Residential and Home Equity [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	387,006	387,371
Residential and Home Equity [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Residential and Home Equity [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	364	382
Residential and Home Equity [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Construction [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	153,394	166,538
Allowance for credit losses	2,785	3,026	3,777	1,456
Construction [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	153,394	166,370
Construction [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Construction [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	168
Construction [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Commercial and Industrial [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	472,189	478,758
Allowance for credit losses	11,346	11,503
Commercial and Industrial [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	471,348	478,437
Commercial and Industrial [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	594	63
Commercial and Industrial [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	247	258
Commercial and Industrial [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Agricultural [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	275,785	314,525
Allowance for credit losses	12,542	10,202
Agricultural [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	271,307	308,830
Agricultural [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	4,467	5,682
Agricultural [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	11	13
Agricultural [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Commercial Leases [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	121,162	111,649
Allowance for credit losses	1,720	1,924	1,466	938
Commercial Leases [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	121,099	111,568
Commercial Leases [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	63	81
Commercial Leases [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Commercial Leases [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Consumer and Other [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	5,382	5,886
Allowance for credit losses	152	171	$ 421	$ 663
Consumer and Other [Member] | Pass [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	5,251	5,650
Consumer and Other [Member] | Special Mention [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	0	0
Consumer and Other [Member] | Substandard [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	131	236
Consumer and Other [Member] | Doubtful [Member]
Loan & Lease Portfolio Allocated by Management's Internal Risk Ratings [Abstract]
Gross loans and leases	$ 0	$ 0