Loans and Allowance for Credit Losses - Loan Portfolio Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans Receivable Aging Analysis [Abstract]
Total Past Due	$ 4,452,524	$ 3,992,775
Total Loans Receivable	4,454,561	3,995,523
Total Loans> 90 Days and Accruing	0	0
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,164,976	2,789,843
Total Loans> 90 Days and Accruing	0	0
Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	417,232	400,313
Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	131,504	145,118
Total Loans> 90 Days and Accruing	0	0
Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	280,993	279,272
Total Loans> 90 Days and Accruing	0	0
Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	417,232	400,313
Total Loans> 90 Days and Accruing	0	0
Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	369,926	298,942
Total Loans> 90 Days and Accruing	0	0
Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,965,321	1,666,198
Total Loans> 90 Days and Accruing	0	0
Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	121,708	151,484
Total Loans> 90 Days and Accruing	0	0
Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	935,454	832,008
Total Loans> 90 Days and Accruing	0	0
Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	89,685	78,442
Total Loans> 90 Days and Accruing	0	0
All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	142,738	143,746
Total Loans> 90 Days and Accruing	0	0
Financial Asset, 30 to 59 Days Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	5,576	14,244
Financial Asset, 30 to 59 Days Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,733	11,621
Financial Asset, 30 to 59 Days Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	93	159
Financial Asset, 30 to 59 Days Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	243	0
Financial Asset, 30 to 59 Days Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,080	2,532
Financial Asset, 30 to 59 Days Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, 30 to 59 Days Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,317	8,930
Financial Asset, 30 to 59 Days Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, 30 to 59 Days Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	572	381
Financial Asset, 30 to 59 Days Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	271	388
Financial Asset, 30 to 59 Days Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	1,854
Financial Asset, 60 to 89 Days Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	671	2,334
Financial Asset, 60 to 89 Days Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	404	1,975
Financial Asset, 60 to 89 Days Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	12	199
Financial Asset, 60 to 89 Days Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	139	222
Financial Asset, 60 to 89 Days Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	253	914
Financial Asset, 60 to 89 Days Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	640
Financial Asset, 60 to 89 Days Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	10
Financial Asset, 60 to 89 Days Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	54	302
Financial Asset, 60 to 89 Days Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	213	47
Financial Asset, 60 to 89 Days Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	17,471	8,238
Financial Asset, Equal to or Greater than 90 Days Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	15,545	6,376
Financial Asset, Equal to or Greater than 90 Days Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	203	203
Financial Asset, Equal to or Greater than 90 Days Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,813	1
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,644	2,012
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	580	1,676
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	11,305	2,484
Financial Asset, Equal to or Greater than 90 Days Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	321	588
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,486	1,156
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	119	118
Financial Asset, Equal to or Greater than 90 Days Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Total Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	23,718	24,816
Total Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	20,682	19,972
Total Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	308	561
Total Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,195	223
Total Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	3,977	5,458
Total Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	580	1,676
Total Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	13,622	12,054
Total Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	321	598
Total Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,112	1,839
Total Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	603	553
Total Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	1,854
Current
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,430,843	3,970,707
Current | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	3,144,294	2,769,871
Current | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	131,196	144,557
Current | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	278,798	279,049
Current | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	413,255	394,855
Current | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	369,346	297,266
Current | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,951,699	1,654,144
Current | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	121,387	150,886
Current | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	933,342	830,169
Current | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	89,082	77,889
Current | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	$ 142,738	$ 141,892