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, 2024	Dec. 31, 2023
Credit Quality Information [Abstract]
Current fiscal year	$ 115,715	$ 792,071
Fiscal year before current fiscal year	778,434	1,402,051
Two years before current fiscal year	1,405,307	994,108
Three years before current fiscal year	1,019,248	619,354
Four years before current fiscal year	612,374	381,174
Prior	1,497,590	1,315,596
Revolving Loans	70,626	76,211
Current period gross writeoffs, current fiscal year	0	10
Current period gross writeoffs, fiscal year before current fiscal year	39	761
Current period gross writeoffs, two year before current fiscal year	51	208
Current period gross writeoffs, three year before current fiscal year	406	51
Current period gross writeoffs, four year before current fiscal year	0	93
Current period gross writeoffs, prior	323	1,508
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	5,499,295	5,580,565
Current period gross writeoffs, total loans receivables	819	2,631
Pass
Credit Quality Information [Abstract]
Current fiscal year	114,406	786,908
Fiscal year before current fiscal year	773,142	1,390,885
Two years before current fiscal year	1,394,065	976,531
Three years before current fiscal year	1,004,765	616,020
Four years before current fiscal year	609,437	376,655
Prior	1,438,441	1,254,871
Revolving Loans	70,050	75,700
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	5,404,306	5,477,570
Special Mention
Credit Quality Information [Abstract]
Current fiscal year	1,283	4,925
Fiscal year before current fiscal year	4,908	5,566
Two years before current fiscal year	5,258	15,110
Three years before current fiscal year	12,560	2,721
Four years before current fiscal year	2,183	3,368
Prior	39,500	42,350
Revolving Loans	0	10
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	65,693	74,050
Substandard
Credit Quality Information [Abstract]
Current fiscal year	26	238
Fiscal year before current fiscal year	384	5,600
Two years before current fiscal year	5,984	2,467
Three years before current fiscal year	1,923	613
Four years before current fiscal year	754	1,151
Prior	19,649	18,375
Revolving Loans	576	501
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	29,296	28,945
Agricultural Loans
Credit Quality Information [Abstract]
Current fiscal year	38,758	147,999
Fiscal year before current fiscal year	121,403	27,905
Two years before current fiscal year	30,846	10,044
Three years before current fiscal year	16,192	2,549
Four years before current fiscal year	3,402	1,921
Prior	2,616	5,854
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	0	276
Current period gross writeoffs, two year before current fiscal year	0	0
Current period gross writeoffs, three year before current fiscal year	52	0
Current period gross writeoffs, four year before current fiscal year	0	0
Current period gross writeoffs, prior	0	132
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	213,217	196,272
Current period gross writeoffs, total loans receivables	52	408
Agricultural Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	38,758	147,993
Fiscal year before current fiscal year	121,171	27,895
Two years before current fiscal year	30,478	10,044
Three years before current fiscal year	16,192	2,549
Four years before current fiscal year	3,396	1,883
Prior	1,852	5,854
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	211,847	196,218
Agricultural Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	6
Fiscal year before current fiscal year	11	10
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	38
Prior	748	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	759	54
Agricultural Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	221	0
Two years before current fiscal year	368	0
Three years before current fiscal year	0	0
Four years before current fiscal year	6	0
Prior	16	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	611	0
Commercial Industrial And Other Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	33,337	291,351
Fiscal year before current fiscal year	279,679	309,188
Two years before current fiscal year	307,759	242,971
Three years before current fiscal year	240,856	155,119
Four years before current fiscal year	141,263	74,532
Prior	400,331	377,607
Revolving Loans		0
Current period gross writeoffs, current fiscal year	0	0
Current period gross writeoffs, fiscal year before current fiscal year	0	353
Current period gross writeoffs, two year before current fiscal year	0	0
Current period gross writeoffs, three year before current fiscal year	273	49
Current period gross writeoffs, four year before current fiscal year	0	20
Current period gross writeoffs, prior	1	107
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,403,226	1,450,768
Current period gross writeoffs, total loans receivables	274	529
Commercial Industrial And Other Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	33,234	290,304
Fiscal year before current fiscal year	278,618	306,794
Two years before current fiscal year	305,634	232,198
Three years before current fiscal year	233,432	154,499
Four years before current fiscal year	139,860	73,906
Prior	375,188	347,957
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,365,966	1,405,658
Commercial Industrial And Other Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	103	1,047
Fiscal year before current fiscal year	1,061	1,857
Two years before current fiscal year	1,528	9,982
Three years before current fiscal year	7,073	562
Four years before current fiscal year	1,359	597
Prior	24,394	28,900
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	35,519	42,945
Commercial Industrial And Other Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	537
Two years before current fiscal year	597	791
Three years before current fiscal year	351	58
Four years before current fiscal year	44	29
Prior	749	750
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,741	2,165
Consumer Loans
Credit Quality Information [Abstract]
Current fiscal year	1,612	9,633
Fiscal year before current fiscal year	8,211	40,656
Two years before current fiscal year	36,665	21,589
Three years before current fiscal year	17,999	10,526
Four years before current fiscal year	8,524	4,534
Prior	6,558	4,076
Revolving Loans	0	0
Current period gross writeoffs, current fiscal year	0	22
Current period gross writeoffs, fiscal year before current fiscal year	3	177
Current period gross writeoffs, two year before current fiscal year	51	89
Current period gross writeoffs, three year before current fiscal year	81	10
Current period gross writeoffs, four year before current fiscal year	0	7
Current period gross writeoffs, prior	291	1,075
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	79,569	91,014
Current period gross writeoffs, total loans receivables	426	1,380
Consumer Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	1,612	9,547
Fiscal year before current fiscal year	8,161	40,225
Two years before current fiscal year	36,304	21,264
Three years before current fiscal year	17,758	10,387
Four years before current fiscal year	8,383	4,475
Prior	6,473	4,035
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	78,691	89,933
Consumer Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	26
Two years before current fiscal year	23	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	23	26
Consumer Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	86
Fiscal year before current fiscal year	50	405
Two years before current fiscal year	338	325
Three years before current fiscal year	241	139
Four years before current fiscal year	141	59
Prior	85	41
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	855	1,055
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,803,283	3,842,511
Real Estate Loan | Construction and Land Development
Credit Quality Information [Abstract]
Current fiscal year	3,584	68,086
Fiscal year before current fiscal year	81,753	74,065
Two years before current fiscal year	56,302	27,392
Three years before current fiscal year	16,509	5,188
Four years before current fiscal year	5,781	10,795
Prior	22,922	19,551
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	14
Current period gross writeoffs, prior	0	0
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	186,851	205,077
Current period gross writeoffs, total loans receivables	0	14
Real Estate Loan | Construction and Land Development | Pass
Credit Quality Information [Abstract]
Current fiscal year	3,584	68,086
Fiscal year before current fiscal year	81,753	74,065
Two years before current fiscal year	56,302	27,392
Three years before current fiscal year	16,509	5,188
Four years before current fiscal year	5,781	10,795
Prior	22,499	19,115
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	186,428	204,641
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	0
Four years before current fiscal year	0	0
Prior	423	436
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	423	436
Real Estate Loan | Agricultural
Credit Quality Information [Abstract]
Current fiscal year	10,100	19,437
Fiscal year before current fiscal year	19,069	164,812
Two years before current fiscal year	162,999	58,813
Three years before current fiscal year	57,260	53,249
Four years before current fiscal year	52,598	20,589
Prior	86,915	74,232
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	388,941	391,132
Current period gross writeoffs, total loans receivables	0	0
Real Estate Loan | Agricultural | Pass
Credit Quality Information [Abstract]
Current fiscal year	8,930	19,231
Fiscal year before current fiscal year	18,867	164,812
Two years before current fiscal year	162,999	57,815
Three years before current fiscal year	56,265	53,249
Four years before current fiscal year	52,598	19,419
Prior	83,981	71,189
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	383,640	385,715
Real Estate Loan | Agricultural | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	1,170	206
Fiscal year before current fiscal year	202	0
Two years before current fiscal year	0	627
Three years before current fiscal year	628	0
Four years before current fiscal year	0	1,170
Prior	1,864	1,868
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,864	3,871
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	371
Three years before current fiscal year	367	0
Four years before current fiscal year	0	0
Prior	1,070	1,175
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,437	1,546
Real Estate Loan | Commercial And Multifamily Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	9,492	189,294
Fiscal year before current fiscal year	209,743	686,704
Two years before current fiscal year	713,007	550,570
Three years before current fiscal year	572,219	319,254
Four years before current fiscal year	322,032	241,661
Prior	882,357	716,350
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	25
Current period gross writeoffs, prior	0	0
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,708,850	2,703,833
Current period gross writeoffs, total loans receivables	0	25
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	9,482	185,628
Fiscal year before current fiscal year	206,109	680,099
Two years before current fiscal year	706,392	548,733
Three years before current fiscal year	570,053	317,075
Four years before current fiscal year	321,198	239,323
Prior	865,221	701,464
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,678,455	2,672,322
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	10	3,666
Fiscal year before current fiscal year	3,634	2,706
Two years before current fiscal year	2,854	1,317
Three years before current fiscal year	1,716	2,159
Four years before current fiscal year	824	1,563
Prior	8,647	7,778
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	17,685	19,189
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	3,899
Two years before current fiscal year	3,761	520
Three years before current fiscal year	450	20
Four years before current fiscal year	10	775
Prior	8,489	7,108
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	12,710	12,322
1-4 Family | Real Estate Loan
Credit Quality Information [Abstract]
Current fiscal year	18,832	66,271
Fiscal year before current fiscal year	58,576	98,721
Two years before current fiscal year	97,729	82,729
Three years before current fiscal year	98,213	73,469
Four years before current fiscal year	78,774	27,142
Prior	95,891	117,926
Revolving Loans	70,626	76,211
Current period gross writeoffs, current fiscal year	0	10
Current period gross writeoffs, fiscal year before current fiscal year	36	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	14
Current period gross writeoffs, prior	31	63
Current period gross writeoffs, revolving loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	518,641	542,469
Current period gross writeoffs, total loans receivables	67	87
1-4 Family | Real Estate Loan | Pass
Credit Quality Information [Abstract]
Current fiscal year	18,806	66,119
Fiscal year before current fiscal year	58,463	96,995
Two years before current fiscal year	95,956	79,085
Three years before current fiscal year	94,556	73,073
Four years before current fiscal year	78,221	26,854
Prior	83,227	105,257
Revolving Loans	70,050	75,700
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	499,279	523,083
1-4 Family | Real Estate Loan | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	967
Two years before current fiscal year	853	3,184
Three years before current fiscal year	3,143	0
Four years before current fiscal year	0	0
Prior	3,847	3,804
Revolving Loans	0	10
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	7,843	7,965
1-4 Family | Real Estate Loan | Substandard
Credit Quality Information [Abstract]
Current fiscal year	26	152
Fiscal year before current fiscal year	113	759
Two years before current fiscal year	920	460
Three years before current fiscal year	514	396
Four years before current fiscal year	553	288
Prior	8,817	8,865
Revolving Loans	576	501
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 11,519	$ 11,421