Loans Receivable and the Allowance for Credit Losses - Schedule of Amortized Cost Basis Based on Delinquency Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	$ 4,126,947	$ 3,840,524
90 Days or More Past Due And Accruing	468	565
Current
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	4,093,155	3,822,849
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	7,660	10,999
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	4,502	1,205
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	21,630	5,471
Agricultural
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	118,414	115,320
90 Days or More Past Due And Accruing	0	0
Agricultural | Current
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	117,852	114,922
Agricultural | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	338	100
Agricultural | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	0	0
Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	224	298
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,075,003	1,055,162
90 Days or More Past Due And Accruing	0	0
Commercial and Industrial | Current
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,058,301	1,052,406
Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	440	922
Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	401	111
Commercial and Industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	15,861	1,723
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	2,225,310	1,980,018
90 Days or More Past Due And Accruing	0	0
Commercial Real Estate | Construction & development
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	323,195	270,991
90 Days or More Past Due And Accruing	0	0
Commercial Real Estate | Farmland
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	184,955	183,913
90 Days or More Past Due And Accruing	0	0
Commercial Real Estate | Multifamily
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	383,178	252,129
90 Days or More Past Due And Accruing	0	0
Commercial Real Estate | Commercial real estate-other
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,333,982	1,272,985
90 Days or More Past Due And Accruing	0	0
Commercial Real Estate | Current
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	2,216,829	1,972,023
Commercial Real Estate | Current | Construction & development
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	323,165	270,905
Commercial Real Estate | Current | Farmland
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	182,759	182,115
Commercial Real Estate | Current | Multifamily
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	383,178	252,129
Commercial Real Estate | Current | Commercial real estate-other
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,327,727	1,266,874
Commercial Real Estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	2,836	6,389
Commercial Real Estate | 30 - 59 Days Past Due | Construction & development
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	30	86
Commercial Real Estate | 30 - 59 Days Past Due | Farmland
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	677	729
Commercial Real Estate | 30 - 59 Days Past Due | Multifamily
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	0	0
Commercial Real Estate | 30 - 59 Days Past Due | Commercial real estate-other
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	2,129	5,574
Commercial Real Estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,642	45
Commercial Real Estate | 60 - 89 Days Past Due | Construction & development
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	0	0
Commercial Real Estate | 60 - 89 Days Past Due | Farmland
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	352	0
Commercial Real Estate | 60 - 89 Days Past Due | Multifamily
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	0	0
Commercial Real Estate | 60 - 89 Days Past Due | Commercial real estate-other
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,290	45
Commercial Real Estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	4,003	1,561
Commercial Real Estate | 90 Days or More Past Due | Construction & development
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	0	0
Commercial Real Estate | 90 Days or More Past Due | Farmland
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,167	1,069
Commercial Real Estate | 90 Days or More Past Due | Multifamily
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	0	0
Commercial Real Estate | 90 Days or More Past Due | Commercial real estate-other
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	2,836	492
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	640,437	614,428
90 Days or More Past Due And Accruing	468	565
Residential Real Estate | One- to four- family first liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	459,798	451,210
90 Days or More Past Due And Accruing	468	565
Residential Real Estate | One- to four- family junior liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	180,639	163,218
90 Days or More Past Due And Accruing	0	0
Residential Real Estate | Current
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	632,551	608,055
Residential Real Estate | Current | One- to four- family first liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	453,212	446,066
Residential Real Estate | Current | One- to four- family junior liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	179,339	161,989
Residential Real Estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	3,928	3,478
Residential Real Estate | 30 - 59 Days Past Due | One- to four- family first liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	3,572	3,177
Residential Real Estate | 30 - 59 Days Past Due | One- to four- family junior liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	356	301
Residential Real Estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	2,431	1,032
Residential Real Estate | 60 - 89 Days Past Due | One- to four- family first liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,741	954
Residential Real Estate | 60 - 89 Days Past Due | One- to four- family junior liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	690	78
Residential Real Estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,527	1,863
Residential Real Estate | 90 Days or More Past Due | One- to four- family first liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	1,273	1,013
Residential Real Estate | 90 Days or More Past Due | One- to four- family junior liens
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	254	850
Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	67,783	75,596
90 Days or More Past Due And Accruing	0	0
Consumer | Current
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	67,622	75,443
Consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	118	110
Consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	28	17
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Loans held for investment, net of unearned income	$ 15	$ 26