Loans and Allowance for Credit Losses - Credit Risk Profile of Loan Portfolio on Amortized Cost Basis Based on Risk Rating Category (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Credit Quality Information [Abstract]
Current fiscal year	$ 302,193	$ 1,535,342
Fiscal year before current fiscal year	1,411,174	973,016
Two years before current fiscal year	943,090	669,475
Three years before current fiscal year	632,275	387,967
Four years before current fiscal year	364,425	354,435
Prior	1,117,833	862,255
Revolving Loans	42,426	43,722
Current period gross writeoffs, current fiscal year	0	311
Current period gross writeoffs, fiscal year before current fiscal year	333	603
Current period gross writeoffs, two year before current fiscal year	83	195
Current period gross writeoffs, three year before current fiscal year	50	462
Current period gross writeoffs, four year before current fiscal year	62	30
Current period gross writeoffs, prior	532	1,349
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,813,416	4,826,212
Current period gross writeoffs, total loans receivables	1,060	2,950
Pass
Credit Quality Information [Abstract]
Current fiscal year	301,984	1,524,905
Fiscal year before current fiscal year	1,402,433	969,145
Two years before current fiscal year	932,637	656,609
Three years before current fiscal year	622,813	382,543
Four years before current fiscal year	360,885	335,886
Prior	1,081,296	832,814
Revolving Loans	42,426	43,722
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,744,474	4,745,624
Special Mention
Credit Quality Information [Abstract]
Current fiscal year	36	5,126
Fiscal year before current fiscal year	3,591	2,163
Two years before current fiscal year	8,867	11,356
Three years before current fiscal year	8,764	4,118
Four years before current fiscal year	2,372	8,814
Prior	17,057	12,891
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	40,687	44,468
Substandard
Credit Quality Information [Abstract]
Current fiscal year	173	5,311
Fiscal year before current fiscal year	5,150	1,708
Two years before current fiscal year	1,586	1,510
Three years before current fiscal year	698	1,306
Four years before current fiscal year	1,168	9,735
Prior	19,480	16,550
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	28,255	36,120
Agricultural Loans
Credit Quality Information [Abstract]
Current fiscal year	63,715	138,558
Fiscal year before current fiscal year	58,321	18,783
Two years before current fiscal year	18,170	3,433
Three years before current fiscal year	4,488	4,720
Four years before current fiscal year	2,195	981
Prior	1,429	363
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	276	93
Current period gross writeoffs, two year before current fiscal year	0	0
Current period gross writeoffs, three year before current fiscal year	0	0
Current period gross writeoffs, four year before current fiscal year	0	0
Current period gross writeoffs, prior	0	0
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	148,318	166,838
Current period gross writeoffs, total loans receivables	276	93
Agricultural Loans \| Pass
Credit Quality Information [Abstract]
Current fiscal year	63,709	137,327
Fiscal year before current fiscal year	57,549	18,783
Two years before current fiscal year	18,115	3,433
Three years before current fiscal year	4,488	3,918
Four years before current fiscal year	2,155	915
Prior	1,429	254
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	147,445	164,630
Agricultural Loans \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	6	1,178
Fiscal year before current fiscal year	677	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	756
Four years before current fiscal year	36	66
Prior	0	109
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	719	2,109
Agricultural Loans \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	53
Fiscal year before current fiscal year	95	0
Two years before current fiscal year	55	0
Three years before current fiscal year	0	46
Four years before current fiscal year	4	0
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	154	99
Commercial Industrial And Other Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	99,877	450,816
Fiscal year before current fiscal year	415,506	227,096
Two years before current fiscal year	225,376	182,487
Three years before current fiscal year	173,280	64,511
Four years before current fiscal year	58,729	69,366
Prior	289,352	248,195
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	39
Current period gross writeoffs, fiscal year before current fiscal year	0	311
Current period gross writeoffs, two year before current fiscal year	0	39
Current period gross writeoffs, three year before current fiscal year	49	439
Current period gross writeoffs, four year before current fiscal year	0	23
Current period gross writeoffs, prior	13	19
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,262,120	1,242,471
Current period gross writeoffs, total loans receivables	62	870
Commercial Industrial And Other Portfolio Segment \| Pass
Credit Quality Information [Abstract]
Current fiscal year	99,847	450,001
Fiscal year before current fiscal year	414,595	226,038
Two years before current fiscal year	217,451	172,208
Three years before current fiscal year	165,209	63,906
Four years before current fiscal year	58,286	61,929
Prior	284,514	247,404
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,239,902	1,221,486
Commercial Industrial And Other Portfolio Segment \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	30	469
Fiscal year before current fiscal year	591	640
Two years before current fiscal year	7,628	10,095
Three years before current fiscal year	7,984	570
Four years before current fiscal year	436	7,280
Prior	4,471	158
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	21,140	19,212
Commercial Industrial And Other Portfolio Segment \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	346
Fiscal year before current fiscal year	320	418
Two years before current fiscal year	297	184
Three years before current fiscal year	87	35
Four years before current fiscal year	7	157
Prior	367	633
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,078	1,773
Consumer Loans
Credit Quality Information [Abstract]
Current fiscal year	4,770	48,669
Fiscal year before current fiscal year	39,288	21,352
Two years before current fiscal year	16,366	12,105
Three years before current fiscal year	9,131	8,011
Four years before current fiscal year	0	2,002
Prior	5,628	5,636
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	22
Current period gross writeoffs, fiscal year before current fiscal year	57	177
Current period gross writeoffs, two year before current fiscal year	83	89
Current period gross writeoffs, three year before current fiscal year	1	10
Current period gross writeoffs, four year before current fiscal year	9	7
Current period gross writeoffs, prior	477	1,075
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	80,241	97,775
Current period gross writeoffs, total loans receivables	627	1,380
Consumer Loans \| Pass
Credit Quality Information [Abstract]
Current fiscal year	4,768	48,600
Fiscal year before current fiscal year	39,001	21,088
Two years before current fiscal year	16,075	12,101
Three years before current fiscal year	9,075	7,968
Four years before current fiscal year	0	1,945
Prior	5,556	5,630
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	79,498	97,332
Consumer Loans \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	18
Two years before current fiscal year	0	1
Three years before current fiscal year	0	0
Four years before current fiscal year	0	5
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	11	24
Consumer Loans \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	2	69
Fiscal year before current fiscal year	276	246
Two years before current fiscal year	291	3
Three years before current fiscal year	56	43
Four years before current fiscal year	35	52
Prior	72	6
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	732	419
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,322,737	3,319,128
Real Estate Loan \| Construction and Land Development
Credit Quality Information [Abstract]
Current fiscal year	22,920	63,846
Fiscal year before current fiscal year	76,473	39,790
Two years before current fiscal year	19,722	12,558
Three years before current fiscal year	6,004	15,801
Four years before current fiscal year	15,785	1,210
Prior	10,670	11,059
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	0	0
Current period gross writeoffs, two year before current fiscal year	0	0
Current period gross writeoffs, three year before current fiscal year	0	0
Current period gross writeoffs, four year before current fiscal year	0	0
Current period gross writeoffs, prior		2
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	151,574	144,264
Current period gross writeoffs, total loans receivables	14	2
Real Estate Loan \| Construction and Land Development \| Pass
Credit Quality Information [Abstract]
Current fiscal year	22,920	63,846
Fiscal year before current fiscal year	76,473	39,790
Two years before current fiscal year	19,722	12,558
Three years before current fiscal year	6,004	15,787
Four years before current fiscal year	15,785	1,210
Prior	10,216	10,601
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	151,120	143,792
Real Estate Loan \| Construction and Land Development \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0	0
Real Estate Loan \| Construction and Land Development \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	14
Four years before current fiscal year	0	0
Prior	454	458
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	454	472
Real Estate Loan \| Agricultural
Credit Quality Information [Abstract]
Current fiscal year	5,197	172,956
Fiscal year before current fiscal year	169,714	67,115
Two years before current fiscal year	58,982	58,773
Three years before current fiscal year	56,198	25,060
Four years before current fiscal year	23,779	29,229
Prior	78,350	57,194
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	0	0
Current period gross writeoffs, two year before current fiscal year	0	0
Current period gross writeoffs, three year before current fiscal year	0	0
Current period gross writeoffs, four year before current fiscal year	0	0
Current period gross writeoffs, prior	0	0
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	392,220	410,327
Current period gross writeoffs, total loans receivables	0	0
Real Estate Loan \| Agricultural \| Pass
Credit Quality Information [Abstract]
Current fiscal year	5,197	171,833
Fiscal year before current fiscal year	169,602	67,115
Two years before current fiscal year	58,982	58,283
Three years before current fiscal year	56,172	23,820
Four years before current fiscal year	22,539	27,573
Prior	74,908	52,799
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	387,400	401,423
Real Estate Loan \| Agricultural \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	1,123
Fiscal year before current fiscal year	112	0
Two years before current fiscal year	0	490
Three years before current fiscal year	26	1,240
Four years before current fiscal year	1,240	273
Prior	2,231	3,121
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,609	6,247
Real Estate Loan \| Agricultural \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	1,383
Prior	1,211	1,274
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,211	2,657
Real Estate Loan \| Commercial And Multifamily Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	86,685	564,891
Fiscal year before current fiscal year	566,312	511,379
Two years before current fiscal year	521,539	320,612
Three years before current fiscal year	310,287	241,945
Four years before current fiscal year	234,273	217,851
Prior	640,915	467,679
Revolving Loans		0
Current period gross writeoffs, current fiscal year	0	250
Current period gross writeoffs, fiscal year before current fiscal year	0	22
Current period gross writeoffs, two year before current fiscal year	0	0
Current period gross writeoffs, three year before current fiscal year	0	0
Current period gross writeoffs, four year before current fiscal year	0	0
Current period gross writeoffs, prior	0	142
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,360,011	2,324,357
Current period gross writeoffs, total loans receivables	25	414
Real Estate Loan \| Commercial And Multifamily Portfolio Segment \| Pass
Credit Quality Information [Abstract]
Current fiscal year	86,685	558,921
Fiscal year before current fiscal year	560,815	509,614
Two years before current fiscal year	519,951	319,049
Three years before current fiscal year	309,492	239,564
Four years before current fiscal year	232,790	211,505
Prior	626,080	453,076
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,335,813	2,291,729
Real Estate Loan \| Commercial And Multifamily Portfolio Segment \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	2,187
Fiscal year before current fiscal year	2,016	1,287
Two years before current fiscal year	1,123	769
Three years before current fiscal year	754	1,508
Four years before current fiscal year	660	952
Prior	6,498	8,503
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	11,051	15,206
Real Estate Loan \| Commercial And Multifamily Portfolio Segment \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	3,783
Fiscal year before current fiscal year	3,481	478
Two years before current fiscal year	465	794
Three years before current fiscal year	41	873
Four years before current fiscal year	823	5,394
Prior	8,337	6,100
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	13,147	17,422
1-4 Family \| Real Estate Loan
Credit Quality Information [Abstract]
Current fiscal year	19,029	95,606
Fiscal year before current fiscal year	85,560	87,501
Two years before current fiscal year	82,935	79,507
Three years before current fiscal year	72,887	27,919
Four years before current fiscal year	24,606	33,796
Prior	91,489	72,129
Revolving Loans	42,426	43,722
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	0	0
Current period gross writeoffs, two year before current fiscal year	0	67
Current period gross writeoffs, three year before current fiscal year	0	13
Current period gross writeoffs, four year before current fiscal year	14	0
Current period gross writeoffs, prior	42	111
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	418,932	440,180
Current period gross writeoffs, total loans receivables	56	191
1-4 Family \| Real Estate Loan \| Pass
Credit Quality Information [Abstract]
Current fiscal year	18,858	94,377
Fiscal year before current fiscal year	84,398	86,717
Two years before current fiscal year	82,341	78,977
Three years before current fiscal year	72,373	27,580
Four years before current fiscal year	24,307	30,809
Prior	78,593	63,050
Revolving Loans	42,426	43,722
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	403,296	425,232
1-4 Family \| Real Estate Loan \| Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	169
Fiscal year before current fiscal year	184	218
Two years before current fiscal year	116	1
Three years before current fiscal year	0	44
Four years before current fiscal year	0	238
Prior	3,857	1,000
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,157	1,670
1-4 Family \| Real Estate Loan \| Substandard
Credit Quality Information [Abstract]
Current fiscal year	171	1,060
Fiscal year before current fiscal year	978	566
Two years before current fiscal year	478	529
Three years before current fiscal year	514	295
Four years before current fiscal year	299	2,749
Prior	9,039	8,079
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 11,479	$ 13,278

Loans and Allowance for Credit Losses - Credit Risk Profile of Loan Portfolio on Amortized Cost Basis Based on Risk Rating Category (Details) - USD ($)
$ in Thousands