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	Mar. 31, 2023	Dec. 31, 2022
Credit Quality Information [Abstract]
Current fiscal year	$ 134,451	$ 1,535,342
Fiscal year before current fiscal year	1,444,312	973,016
Two years before current fiscal year	941,949	669,475
Three years before current fiscal year	648,881	387,967
Four years before current fiscal year	374,911	354,435
Prior	1,174,067	862,255
Revolving Loans	42,060	43,722
Current period gross writeoffs, current fiscal year	0	311
Current period gross writeoffs, fiscal year before current fiscal year	50	603
Current period gross writeoffs, two year before current fiscal year	61	195
Current period gross writeoffs, three year before current fiscal year	1	462
Current period gross writeoffs, four year before current fiscal year	9	30
Current period gross writeoffs, prior	359	1,349
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,760,631	4,826,212
Current period gross writeoffs, total loans receivables	480	2,950
Pass
Credit Quality Information [Abstract]
Current fiscal year	134,327	1,524,905
Fiscal year before current fiscal year	1,435,092	969,145
Two years before current fiscal year	931,043	656,609
Three years before current fiscal year	639,336	382,543
Four years before current fiscal year	370,452	335,886
Prior	1,131,368	832,814
Revolving Loans	42,060	43,722
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,683,678	4,745,624
Special Mention
Credit Quality Information [Abstract]
Current fiscal year	71	5,126
Fiscal year before current fiscal year	3,614	2,163
Two years before current fiscal year	9,201	11,356
Three years before current fiscal year	8,772	4,118
Four years before current fiscal year	3,225	8,814
Prior	22,139	12,891
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	47,022	44,468
Substandard
Credit Quality Information [Abstract]
Current fiscal year	53	5,311
Fiscal year before current fiscal year	5,606	1,708
Two years before current fiscal year	1,705	1,510
Three years before current fiscal year	773	1,306
Four years before current fiscal year	1,234	9,735
Prior	20,560	16,550
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	29,931	36,120
Agricultural Loans
Credit Quality Information [Abstract]
Current fiscal year	39,086	138,558
Fiscal year before current fiscal year	80,041	18,783
Two years before current fiscal year	18,754	3,433
Three years before current fiscal year	4,669	4,720
Four years before current fiscal year	2,263	981
Prior	2,034	363
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	0	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	146,847	166,838
Current period gross writeoffs, total loans receivables	0	93
Agricultural Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	39,064	137,327
Fiscal year before current fiscal year	78,918	18,783
Two years before current fiscal year	18,652	3,433
Three years before current fiscal year	4,669	3,918
Four years before current fiscal year	2,184	915
Prior	1,969	254
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	145,456	164,630
Agricultural Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	22	1,178
Fiscal year before current fiscal year	744	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	756
Four years before current fiscal year	74	66
Prior	65	109
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	905	2,109
Agricultural Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	53
Fiscal year before current fiscal year	379	0
Two years before current fiscal year	102	0
Three years before current fiscal year	0	46
Four years before current fiscal year	5	0
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	486	99
Commercial Industrial And Other Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	60,725	450,816
Fiscal year before current fiscal year	424,326	227,096
Two years before current fiscal year	216,303	182,487
Three years before current fiscal year	177,780	64,511
Four years before current fiscal year	61,727	69,366
Prior	293,379	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	0	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	1,234,240	1,242,471
Current period gross writeoffs, total loans receivables	13	870
Commercial Industrial And Other Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	60,676	450,001
Fiscal year before current fiscal year	423,532	226,038
Two years before current fiscal year	208,003	172,208
Three years before current fiscal year	169,864	63,906
Four years before current fiscal year	61,133	61,929
Prior	286,309	247,404
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,209,517	1,221,486
Commercial Industrial And Other Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	49	469
Fiscal year before current fiscal year	409	640
Two years before current fiscal year	7,972	10,095
Three years before current fiscal year	7,760	570
Four years before current fiscal year	587	7,280
Prior	6,470	158
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	23,247	19,212
Commercial Industrial And Other Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	346
Fiscal year before current fiscal year	385	418
Two years before current fiscal year	328	184
Three years before current fiscal year	156	35
Four years before current fiscal year	7	157
Prior	600	633
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,476	1,773
Consumer Loans
Credit Quality Information [Abstract]
Current fiscal year	2,436	48,669
Fiscal year before current fiscal year	43,465	21,352
Two years before current fiscal year	18,934	12,105
Three years before current fiscal year	10,523	8,011
Four years before current fiscal year	6,056	2,002
Prior	7,016	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	50	177
Current period gross writeoffs, two year before current fiscal year	61	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	306	1,075
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	88,430	97,775
Current period gross writeoffs, total loans receivables	427	1,380
Consumer Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	2,434	48,600
Fiscal year before current fiscal year	43,310	21,088
Two years before current fiscal year	18,614	12,101
Three years before current fiscal year	10,484	7,968
Four years before current fiscal year	6,019	1,945
Prior	6,964	5,630
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	87,825	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	17	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	17	24
Consumer Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	2	69
Fiscal year before current fiscal year	155	246
Two years before current fiscal year	303	3
Three years before current fiscal year	39	43
Four years before current fiscal year	37	52
Prior	52	6
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	588	419
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,291,114	3,319,128
Real Estate Loan | Construction and Land Development
Credit Quality Information [Abstract]
Current fiscal year	9,251	63,846
Fiscal year before current fiscal year	79,695	39,790
Two years before current fiscal year	35,078	12,558
Three years before current fiscal year	7,325	15,801
Four years before current fiscal year	15,878	1,210
Prior	11,930	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	0	2
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	159,157	144,264
Current period gross writeoffs, total loans receivables	0	2
Real Estate Loan | Construction and Land Development | Pass
Credit Quality Information [Abstract]
Current fiscal year	9,251	63,846
Fiscal year before current fiscal year	79,695	39,790
Two years before current fiscal year	35,078	12,558
Three years before current fiscal year	7,325	15,787
Four years before current fiscal year	15,864	1,210
Prior	11,465	10,601
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	158,678	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	14	0
Prior	465	458
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	479	472
Real Estate Loan | Agricultural
Credit Quality Information [Abstract]
Current fiscal year	3,716	172,956
Fiscal year before current fiscal year	167,494	67,115
Two years before current fiscal year	64,522	58,773
Three years before current fiscal year	57,417	25,060
Four years before current fiscal year	23,971	29,229
Prior	84,837	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	401,957	410,327
Current period gross writeoffs, total loans receivables	0	0
Real Estate Loan | Agricultural | Pass
Credit Quality Information [Abstract]
Current fiscal year	3,716	171,833
Fiscal year before current fiscal year	167,382	67,115
Two years before current fiscal year	64,522	58,283
Three years before current fiscal year	57,166	23,820
Four years before current fiscal year	22,731	27,573
Prior	80,117	52,799
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	395,634	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	251	1,240
Four years before current fiscal year	1,240	273
Prior	3,499	3,121
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	5,102	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	1,221	1,274
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,221	2,657
Real Estate Loan | Commercial And Multifamily Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	11,117	564,891
Fiscal year before current fiscal year	561,423	511,379
Two years before current fiscal year	504,156	320,612
Three years before current fiscal year	315,277	241,945
Four years before current fiscal year	237,938	217,851
Prior	675,544	467,679
Revolving Loans	0	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	2,305,455	2,324,357
Current period gross writeoffs, total loans receivables	0	414
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	11,117	558,921
Fiscal year before current fiscal year	555,543	509,614
Two years before current fiscal year	502,596	319,049
Three years before current fiscal year	314,461	239,564
Four years before current fiscal year	235,766	211,505
Prior	658,790	453,076
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,278,273	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	2,163	1,287
Two years before current fiscal year	1,089	769
Three years before current fiscal year	761	1,508
Four years before current fiscal year	1,281	952
Prior	7,933	8,503
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	13,227	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	3,717	478
Two years before current fiscal year	471	794
Three years before current fiscal year	55	873
Four years before current fiscal year	891	5,394
Prior	8,821	6,100
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	13,955	17,422
1-4 Family | Real Estate Loan
Credit Quality Information [Abstract]
Current fiscal year	8,120	95,606
Fiscal year before current fiscal year	87,868	87,501
Two years before current fiscal year	84,202	79,507
Three years before current fiscal year	75,890	27,919
Four years before current fiscal year	27,078	33,796
Prior	99,327	72,129
Revolving Loans	42,060	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	0	0
Current period gross writeoffs, prior	40	111
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	424,545	440,180
Current period gross writeoffs, total loans receivables	40	191
1-4 Family | Real Estate Loan | Pass
Credit Quality Information [Abstract]
Current fiscal year	8,069	94,377
Fiscal year before current fiscal year	86,712	86,717
Two years before current fiscal year	83,578	78,977
Three years before current fiscal year	75,367	27,580
Four years before current fiscal year	26,755	30,809
Prior	85,754	63,050
Revolving Loans	42,060	43,722
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	408,295	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	186	218
Two years before current fiscal year	123	1
Three years before current fiscal year	0	44
Four years before current fiscal year	43	238
Prior	4,172	1,000
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,524	1,670
1-4 Family | Real Estate Loan | Substandard
Credit Quality Information [Abstract]
Current fiscal year	51	1,060
Fiscal year before current fiscal year	970	566
Two years before current fiscal year	501	529
Three years before current fiscal year	523	295
Four years before current fiscal year	280	2,749
Prior	9,401	8,079
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 11,726	$ 13,278