Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Past Due Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 6,239,257	$ 6,180,499
Percent of total loans	100.00%	100.00%
30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	$ 3,277	$ 5,188
Percent past due	0.10%	0.10%
90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	$ 29,507	$ 38,080
Percent past due	0.50%	0.60%
Current
Financing Receivable, Past Due [Line Items]
Loans	$ 6,206,473	$ 6,137,231
Percent of current loans	99.40%	99.30%
Retail & other
Financing Receivable, Past Due [Line Items]
Loans	$ 55,656	$ 55,266
Retail & other | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	729	261
Retail & other | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	74	82
Retail & other | Current
Financing Receivable, Past Due [Line Items]
Loans	54,853	54,923
Commercial | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Loans	1,237,789	1,304,819
Commercial | Commercial & industrial | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	281	210
Commercial | Commercial & industrial | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	5,192	3,328
Commercial | Commercial & industrial | Current
Financing Receivable, Past Due [Line Items]
Loans	1,232,316	1,301,281
Commercial | Owner-occupied CRE
Financing Receivable, Past Due [Line Items]
Loans	971,397	954,599
Commercial | Owner-occupied CRE | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	76	833
Commercial | Owner-occupied CRE | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	5,602	5,647
Commercial | Owner-occupied CRE | Current
Financing Receivable, Past Due [Line Items]
Loans	965,719	948,119
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Loans	1,108,261	1,088,607
Commercial | Agricultural | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	151	20
Commercial | Agricultural | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	13,458	20,416
Commercial | Agricultural | Current
Financing Receivable, Past Due [Line Items]
Loans	1,094,652	1,068,171
Commercial real estate | CRE investment
Financing Receivable, Past Due [Line Items]
Loans	1,130,938	1,149,949
Commercial real estate | CRE investment | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	240	0
Commercial real estate | CRE investment | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	1,100	3,832
Commercial real estate | CRE investment | Current
Financing Receivable, Past Due [Line Items]
Loans	1,129,598	1,146,117
Commercial real estate | Construction & land development
Financing Receivable, Past Due [Line Items]
Loans	326,747	318,600
Commercial real estate | Construction & land development | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	23	0
Commercial real estate | Construction & land development | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	177	771
Commercial real estate | Construction & land development | Current
Financing Receivable, Past Due [Line Items]
Loans	326,547	317,829
Residential | Residential first mortgage
Financing Receivable, Past Due [Line Items]
Loans	1,136,748	1,016,935
Residential | Residential first mortgage | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	1,710	3,628
Residential | Residential first mortgage | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	3,812	3,780
Residential | Residential first mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans	1,131,226	1,009,527
Residential | Residential junior mortgage
Financing Receivable, Past Due [Line Items]
Loans	195,432	177,332
Residential | Residential junior mortgage | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	67	236
Residential | Residential junior mortgage | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	92	224
Residential | Residential junior mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans	195,273	176,872
Residential | Residential construction
Financing Receivable, Past Due [Line Items]
Loans	76,289	114,392
Residential | Residential construction | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential | Residential construction | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential | Residential construction | Current
Financing Receivable, Past Due [Line Items]
Loans	$ 76,289	$ 114,392