Loans - Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total	$ 4,044,268	$ 3,977,900
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	19,111	21,865
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	10,026	11,253
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,117	3,378
Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	5,968	7,234
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	4,025,157	3,956,035
Commercial and Industrial Loans
Financing Receivable, Past Due [Line Items]
Total	591,699	589,541
Commercial and Industrial Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	2,357	4,388
Commercial and Industrial Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	194	832
Commercial and Industrial Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	257
Commercial and Industrial Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,163	3,299
Commercial and Industrial Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	589,342	585,153
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Total	2,172,447	2,121,835
Commercial Real Estate Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	3,485	2,637
Commercial Real Estate Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,023	1,215
Commercial Real Estate Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	278	484
Commercial Real Estate Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,184	938
Commercial Real Estate Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	2,168,962	2,119,198
Agricultural Loans
Financing Receivable, Past Due [Line Items]
Total	413,742	423,803
Agricultural Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	609	750
Agricultural Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	182	5
Agricultural Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	7	248
Agricultural Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	420	497
Agricultural Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	413,133	423,053
Leases
Financing Receivable, Past Due [Line Items]
Total	72,736	71,988
Leases | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Leases | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	72,736	71,988
Home Equity Loans
Financing Receivable, Past Due [Line Items]
Total	322,043	299,685
Home Equity Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	2,397	2,620
Home Equity Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,706	1,016
Home Equity Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	253	571
Home Equity Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	438	1,033
Home Equity Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	319,646	297,065
Consumer Loans
Financing Receivable, Past Due [Line Items]
Total	81,171	87,853
Consumer Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	1,012	852
Consumer Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	928	658
Consumer Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	69	84
Consumer Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	15	110
Consumer Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	80,159	87,001
Credit Cards
Financing Receivable, Past Due [Line Items]
Total	21,433	20,351
Credit Cards | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	322	394
Credit Cards | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	256	165
Credit Cards | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	35	87
Credit Cards | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	31	142
Credit Cards | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	21,111	19,957
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Total	368,997	362,844
Residential Mortgage Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	8,929	10,224
Residential Mortgage Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	5,737	7,362
Residential Mortgage Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,475	1,647
Residential Mortgage Loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	717	1,215
Residential Mortgage Loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 360,068	$ 352,620