Loans Receivable and the Allowance for Credit Losses - Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 220,453	$ 1,091,571
2021	1,032,051	953,672
2020	855,463	258,153
2019	234,106	145,994
2018	136,367	166,651
Prior	370,742	258,653
Revolving Loans	400,853	370,318
Loans held for investment, net of unearned income	3,250,035	3,245,012
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	55,510	178,567
2021	157,973	104,807
2020	90,138	37,491
2019	34,358	33,886
2018	30,137	21,685
Prior	88,827	76,558
Revolving Loans	73,969	79,723
Loans held for investment, net of unearned income	530,912	532,717
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	383
2021	165	20
2020	6	216
2019	286	493
2018	379	29
Prior	805	777
Revolving Loans	0	105
Loans held for investment, net of unearned income	1,641	2,023
Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2022	8,520	22,049
2021	16,772	9,579
2020	7,579	4,738
2019	3,933	1,481
2018	1,117	906
Prior	2,226	2,218
Revolving Loans	54,502	62,446
Loans held for investment, net of unearned income	94,649	103,417
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2022	41,257	301,561
2021	264,233	203,438
2020	177,909	58,294
2019	57,825	36,764
2018	34,263	64,635
Prior	148,707	92,538
Revolving Loans	174,748	145,084
Loans held for investment, net of unearned income	898,942	902,314
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, net of unearned income	1,723,891	1,704,541
Commercial real estate | Construction & development
Financing Receivable, Credit Quality Indicator [Line Items]
2022	12,980	91,536
2021	102,959	37,977
2020	38,830	5,707
2019	2,669	1,611
2018	1,552	1,543
Prior	2,215	589
Revolving Loans	31,925	33,197
Loans held for investment, net of unearned income	193,130	172,160
Commercial real estate | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
2022	17,965	56,367
2021	52,747	39,698
2020	32,079	20,355
2019	13,203	8,401
2018	7,418	7,019
Prior	16,360	11,021
Revolving Loans	1,074	1,812
Loans held for investment, net of unearned income	140,846	144,673
Commercial real estate | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
2022	18,958	105,722
2021	107,653	98,438
2020	98,200	19,234
2019	18,912	8,754
2018	8,680	6,414
Prior	7,180	5,668
Revolving Loans	26	273
Loans held for investment, net of unearned income	259,609	244,503
Commercial real estate | Commercial real estate-other
Financing Receivable, Credit Quality Indicator [Line Items]
2022	65,263	335,386
2021	329,549	459,715
2020	410,722	112,118
2019	102,920	54,604
2018	52,821	64,420
Prior	104,422	69,284
Revolving Loans	64,609	47,678
Loans held for investment, net of unearned income	1,130,306	1,143,205
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, net of unearned income	463,676	466,322
Residential real estate | One- to four- family first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2022	35,714	115,891
2021	101,918	77,106
2020	67,242	27,324
2019	25,672	24,992
2018	22,541	16,425
Prior	74,185	66,239
Revolving Loans	4,611	5,331
Loans held for investment, net of unearned income	331,883	333,308
Residential real estate | One- to four- family first liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	35,714	115,539
2021	101,835	77,086
2020	67,237	27,279
2019	25,627	24,697
2018	22,357	16,425
Prior	73,556	65,676
Revolving Loans	4,611	5,331
Loans held for investment, net of unearned income	330,937	332,033
Residential real estate | One- to four- family first liens | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	352
2021	83	20
2020	5	45
2019	45	295
2018	184	0
Prior	629	563
Revolving Loans	0	0
Loans held for investment, net of unearned income	946	1,275
Residential real estate | One- to four- family junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,889	29,935
2021	27,581	13,335
2020	10,933	4,451
2019	3,972	5,307
2018	4,669	3,590
Prior	8,447	5,311
Revolving Loans	66,302	71,085
Loans held for investment, net of unearned income	131,793	133,014
Residential real estate | One- to four- family junior liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,889	29,904
2021	27,499	13,335
2020	10,933	4,295
2019	3,746	5,109
2018	4,479	3,574
Prior	8,286	5,104
Revolving Loans	66,302	70,980
Loans held for investment, net of unearned income	131,134	132,301
Residential real estate | One- to four- family junior liens | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	31
2021	82	0
2020	0	156
2019	226	198
2018	190	16
Prior	161	207
Revolving Loans	0	105
Loans held for investment, net of unearned income	659	713
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,907	33,124
2021	28,639	14,386
2020	11,969	5,932
2019	5,000	4,080
2018	3,306	1,699
Prior	7,000	5,785
Revolving Loans	3,056	3,412
Loans held for investment, net of unearned income	68,877	68,418
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2022	9,907	33,124
2021	28,639	14,386
2020	11,968	5,917
2019	4,985	4,080
2018	3,301	1,686
Prior	6,985	5,778
Revolving Loans	3,056	3,412
Loans held for investment, net of unearned income	68,841	68,383
Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	1	15
2019	15	0
2018	5	13
Prior	15	7
Revolving Loans	0	0
Loans held for investment, net of unearned income	36	35
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	149,983	882,864
2021	854,595	759,876
2020	693,931	197,924
2019	178,836	84,212
2018	83,575	133,227
Prior	242,498	151,463
Revolving Loans	307,319	271,634
Loans held for investment, net of unearned income	2,510,737	2,481,200
Pass | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2022	8,413	20,145
2021	15,512	8,604
2020	6,747	4,367
2019	3,742	1,260
2018	926	885
Prior	1,043	947
Revolving Loans	51,051	58,119
Loans held for investment, net of unearned income	87,434	94,327
Pass | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2022	38,246	297,285
2021	263,108	199,324
2020	173,340	56,258
2019	55,961	35,522
2018	33,094	60,294
Prior	127,574	75,342
Revolving Loans	160,281	132,323
Loans held for investment, net of unearned income	851,604	856,348
Pass | Commercial real estate | Construction & development
Financing Receivable, Credit Quality Indicator [Line Items]
2022	12,980	90,662
2021	102,092	37,098
2020	37,967	4,942
2019	1,907	1,611
2018	1,552	1,543
Prior	2,205	578
Revolving Loans	31,925	33,197
Loans held for investment, net of unearned income	190,628	169,631
Pass | Commercial real estate | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
2022	17,486	51,682
2021	50,457	33,870
2020	26,514	18,674
2019	11,994	5,105
2018	4,906	5,060
Prior	13,945	10,240
Revolving Loans	1,074	1,812
Loans held for investment, net of unearned income	126,376	126,443
Pass | Commercial real estate | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
2022	18,941	97,188
2021	99,165	96,389
2020	96,159	19,234
2019	18,912	2,754
2018	2,680	4,555
Prior	4,823	3,813
Revolving Loans	26	273
Loans held for investment, net of unearned income	240,706	224,206
Pass | Commercial real estate | Commercial real estate-other
Financing Receivable, Credit Quality Indicator [Line Items]
2022	53,917	325,902
2021	324,261	384,591
2020	353,204	94,449
2019	86,320	37,960
2018	40,417	60,890
Prior	92,908	60,543
Revolving Loans	62,962	45,910
Loans held for investment, net of unearned income	1,013,989	1,010,245
Special mention / watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	14,174	22,675
2021	14,130	32,553
2020	18,086	6,367
2019	5,207	18,447
2018	17,928	9,029
Prior	25,415	17,939
Revolving Loans	11,301	10,391
Loans held for investment, net of unearned income	106,241	117,401
Special mention / watch | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2022	107	1,255
2021	958	148
2020	133	245
2019	173	0
2018	0	17
Prior	909	993
Revolving Loans	1,485	1,685
Loans held for investment, net of unearned income	3,765	4,343
Special mention / watch | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2022	3,011	4,268
2021	1,119	2,342
2020	3,309	781
2019	693	470
2018	444	4,304
Prior	18,277	14,274
Revolving Loans	8,169	6,938
Loans held for investment, net of unearned income	35,022	33,377
Special mention / watch | Commercial real estate | Construction & development
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	874
2021	867	0
2020	0	169
2019	167	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	1,034	1,043
Special mention / watch | Commercial real estate | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
2022	450	3,105
2021	817	3,824
2020	3,664	0
2019	0	734
2018	715	292
Prior	352	223
Revolving Loans	0	0
Loans held for investment, net of unearned income	5,998	8,178
Special mention / watch | Commercial real estate | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
2022	17	7,871
2021	7,834	0
2020	0	0
2019	0	6,000
2018	6,000	1,859
Prior	2,357	544
Revolving Loans	0	0
Loans held for investment, net of unearned income	16,208	16,274
Special mention / watch | Commercial real estate | Commercial real estate-other
Financing Receivable, Credit Quality Indicator [Line Items]
2022	10,589	5,302
2021	2,535	26,239
2020	10,980	5,172
2019	4,174	11,243
2018	10,769	2,557
Prior	3,520	1,905
Revolving Loans	1,647	1,768
Loans held for investment, net of unearned income	44,214	54,186
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	786	7,082
2021	5,188	56,416
2020	53,302	16,155
2019	15,419	8,956
2018	4,348	2,681
Prior	13,197	11,916
Revolving Loans	8,264	8,465
Loans held for investment, net of unearned income	100,504	111,671
Substandard | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	649
2021	302	827
2020	699	126
2019	18	221
2018	191	4
Prior	274	278
Revolving Loans	1,966	2,642
Loans held for investment, net of unearned income	3,450	4,747
Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	8
2021	6	1,772
2020	1,260	1,255
2019	1,171	772
2018	725	37
Prior	2,856	2,922
Revolving Loans	6,298	5,823
Loans held for investment, net of unearned income	12,316	12,589
Substandard | Commercial real estate | Construction & development
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	879
2020	863	596
2019	595	0
2018	0	0
Prior	10	11
Revolving Loans	0	0
Loans held for investment, net of unearned income	1,468	1,486
Substandard | Commercial real estate | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
2022	29	1,580
2021	1,473	2,004
2020	1,901	1,681
2019	1,209	2,562
2018	1,797	1,667
Prior	2,063	558
Revolving Loans	0	0
Loans held for investment, net of unearned income	8,472	10,052
Substandard | Commercial real estate | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	663
2021	654	2,049
2020	2,041	0
2019	0	0
2018	0	0
Prior	0	1,311
Revolving Loans	0	0
Loans held for investment, net of unearned income	2,695	4,023
Substandard | Commercial real estate | Commercial real estate-other
Financing Receivable, Credit Quality Indicator [Line Items]
2022	757	4,182
2021	2,753	48,885
2020	46,538	12,497
2019	12,426	5,401
2018	1,635	973
Prior	7,994	6,836
Revolving Loans	0	0
Loans held for investment, net of unearned income	72,103	78,774
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	0	0
Doubtful | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	0	0
Doubtful | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	0	0
Doubtful | Commercial real estate | Construction & development
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	0	0
Doubtful | Commercial real estate | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	0	0
Doubtful | Commercial real estate | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	0	0
Doubtful | Commercial real estate | Commercial real estate-other
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans	0	0
Loans held for investment, net of unearned income	$ 0	$ 0