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, 2022	Dec. 31, 2021
Credit Quality Information [Abstract]
Current fiscal year	$ 875,249	$ 1,200,288
Fiscal year before current fiscal year	1,143,527	818,943
Two years before current fiscal year	729,809	547,593
Three years before current fiscal year	469,495	374,575
Four years before current fiscal year	382,009	247,554
Prior	1,001,047	763,077
Revolving Loans	47,527	43,493
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,648,663	3,995,523
Pass
Credit Quality Information [Abstract]
Current fiscal year	865,554	1,177,678
Fiscal year before current fiscal year	1,138,255	815,269
Two years before current fiscal year	726,036	527,037
Three years before current fiscal year	461,044	367,606
Four years before current fiscal year	370,010	225,557
Prior	960,750	726,479
Revolving Loans	47,094	42,800
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,568,743	3,882,426
Special Mention
Credit Quality Information [Abstract]
Current fiscal year	4,316	18,807
Fiscal year before current fiscal year	3,568	2,354
Two years before current fiscal year	2,134	11,947
Three years before current fiscal year	6,985	2,519
Four years before current fiscal year	1,801	13,769
Prior	19,991	16,798
Revolving Loans	129	41
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	38,924	66,235
Substandard
Credit Quality Information [Abstract]
Current fiscal year	5,379	3,803
Fiscal year before current fiscal year	1,404	1,320
Two years before current fiscal year	1,639	8,609
Three years before current fiscal year	1,466	4,450
Four years before current fiscal year	10,198	8,228
Prior	20,306	19,800
Revolving Loans	304	652
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	40,696	46,862
Doubtful
Credit Quality Information [Abstract]
Current fiscal year	0
Fiscal year before current fiscal year	300
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
Prior	0
Revolving Loans	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	300
Agricultural Loans
Credit Quality Information [Abstract]
Current fiscal year	85,742	119,453
Fiscal year before current fiscal year	38,403	18,357
Two years before current fiscal year	10,637	8,260
Three years before current fiscal year	4,318	2,972
Four years before current fiscal year	1,850	937
Prior	1,456	1,505
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	142,406	151,484
Agricultural Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	83,601	105,378
Fiscal year before current fiscal year	37,086	17,903
Two years before current fiscal year	10,637	5,612
Three years before current fiscal year	4,013	2,822
Four years before current fiscal year	1,765	924
Prior	1,288	1,316
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	138,390	133,955
Agricultural Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	1,201	13,725
Fiscal year before current fiscal year	1,317	436
Two years before current fiscal year	0	2,648
Three years before current fiscal year	262	150
Four years before current fiscal year	81	13
Prior	0	64
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,861	17,036
Agricultural Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	940	350
Fiscal year before current fiscal year	0	18
Two years before current fiscal year	0	0
Three years before current fiscal year	43	0
Four years before current fiscal year	4	0
Prior	168	125
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,155	493
Commercial Industrial And Other Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	228,125	280,933
Fiscal year before current fiscal year	320,815	168,095
Two years before current fiscal year	185,599	121,298
Three years before current fiscal year	79,245	76,825
Four years before current fiscal year	77,545	23,389
Prior	297,385	305,214
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,188,714	975,754
Commercial Industrial And Other Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	227,589	279,814
Fiscal year before current fiscal year	319,582	167,662
Two years before current fiscal year	184,910	119,702
Three years before current fiscal year	77,852	76,022
Four years before current fiscal year	77,171	22,888
Prior	296,278	302,962
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,183,382	969,050
Commercial Industrial And Other Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	229	613
Fiscal year before current fiscal year	478	399
Two years before current fiscal year	322	1,463
Three years before current fiscal year	1,353	182
Four years before current fiscal year	265	477
Prior	382	819
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,029	3,953
Commercial Industrial And Other Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	307	506
Fiscal year before current fiscal year	455	34
Two years before current fiscal year	367	133
Three years before current fiscal year	40	621
Four years before current fiscal year	109	24
Prior	725	1,433
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,003	2,751
Commercial Industrial And Other Portfolio Segment | Doubtful
Credit Quality Information [Abstract]
Current fiscal year	0
Fiscal year before current fiscal year	300
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
Prior	0
Revolving Loans	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	300
Consumer Loans
Credit Quality Information [Abstract]
Current fiscal year	28,830	28,601
Fiscal year before current fiscal year	25,970	19,145
Two years before current fiscal year	20,627	17,324
Three years before current fiscal year	11,562	6,192
Four years before current fiscal year	3,481	4,340
Prior	4,358	2,840
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	94,828	78,442
Consumer Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	28,818	27,948
Fiscal year before current fiscal year	25,791	19,033
Two years before current fiscal year	20,595	16,978
Three years before current fiscal year	11,516	5,505
Four years before current fiscal year	3,428	4,297
Prior	4,328	1,244
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	94,476	75,005
Consumer Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	68
Fiscal year before current fiscal year	60	54
Two years before current fiscal year	30	38
Three years before current fiscal year	32	9
Four years before current fiscal year	7	0
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	129	169
Consumer Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	12	585
Fiscal year before current fiscal year	119	58
Two years before current fiscal year	2	308
Three years before current fiscal year	14	678
Four years before current fiscal year	46	43
Prior	30	1,596
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	223	3,268
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,222,715	2,789,843
Real Estate Loan | Construction and Land Development
Credit Quality Information [Abstract]
Current fiscal year	24,090	38,766
Fiscal year before current fiscal year	50,440	34,774
Two years before current fiscal year	24,406	23,505
Three years before current fiscal year	27,088	34,841
Four years before current fiscal year	2,276	3,760
Prior	12,772	9,472
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	141,072	145,118
Real Estate Loan | Construction and Land Development | Pass
Credit Quality Information [Abstract]
Current fiscal year	24,090	38,656
Fiscal year before current fiscal year	50,335	34,774
Two years before current fiscal year	24,406	23,505
Three years before current fiscal year	27,088	34,358
Four years before current fiscal year	2,276	3,760
Prior	12,294	9,433
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	140,489	144,486
Real Estate Loan | Construction and Land Development | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	110
Fiscal year before current fiscal year	105	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	105	110
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	483
Four years before current fiscal year	0	0
Prior	478	39
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	478	522
Real Estate Loan | Agricultural
Credit Quality Information [Abstract]
Current fiscal year	97,623	79,665
Fiscal year before current fiscal year	73,365	64,418
Two years before current fiscal year	59,661	30,133
Three years before current fiscal year	26,721	30,774
Four years before current fiscal year	29,838	12,268
Prior	62,951	62,014
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	350,159	279,272
Real Estate Loan | Agricultural | Pass
Credit Quality Information [Abstract]
Current fiscal year	96,798	78,793
Fiscal year before current fiscal year	73,365	64,159
Two years before current fiscal year	59,171	25,713
Three years before current fiscal year	23,222	30,203
Four years before current fiscal year	28,105	12,142
Prior	58,227	54,808
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	338,888	265,818
Real Estate Loan | Agricultural | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	825	872
Fiscal year before current fiscal year	0	259
Two years before current fiscal year	490	4,028
Three years before current fiscal year	3,499	384
Four years before current fiscal year	273	69
Prior	3,248	6,087
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	8,335	11,699
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	392
Three years before current fiscal year	0	187
Four years before current fiscal year	1,460	57
Prior	1,476	1,119
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,936	1,755
Real Estate Loan | Commercial And Multifamily Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	365,250	573,392
Fiscal year before current fiscal year	540,868	419,254
Two years before current fiscal year	343,019	308,051
Three years before current fiscal year	290,075	176,922
Four years before current fiscal year	229,921	166,066
Prior	538,121	321,455
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,307,254	1,965,140
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	359,324	568,200
Fiscal year before current fiscal year	538,921	417,334
Two years before current fiscal year	341,037	299,973
Three years before current fiscal year	287,273	174,448
Four years before current fiscal year	223,273	150,811
Prior	513,758	304,585
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,263,586	1,915,351
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	2,061	3,185
Fiscal year before current fiscal year	1,457	1,206
Two years before current fiscal year	1,153	1,836
Three years before current fiscal year	1,799	1,295
Four years before current fiscal year	993	10,609
Prior	15,212	8,632
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	22,675	26,763
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	3,865	2,007
Fiscal year before current fiscal year	490	714
Two years before current fiscal year	829	6,242
Three years before current fiscal year	1,003	1,179
Four years before current fiscal year	5,655	4,646
Prior	9,151	8,238
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	20,993	23,026
1-4 Family | Real Estate Loan
Credit Quality Information [Abstract]
Current fiscal year	45,589	79,478
Fiscal year before current fiscal year	93,666	94,900
Two years before current fiscal year	85,860	39,022
Three years before current fiscal year	30,486	46,049
Four years before current fiscal year	37,098	36,794
Prior	84,004	60,577
Revolving Loans	47,527	43,493
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	424,230	400,313
1-4 Family | Real Estate Loan | Pass
Credit Quality Information [Abstract]
Current fiscal year	45,334	78,889
Fiscal year before current fiscal year	93,175	94,404
Two years before current fiscal year	85,280	35,554
Three years before current fiscal year	30,080	44,248
Four years before current fiscal year	33,992	30,735
Prior	74,577	52,131
Revolving Loans	47,094	42,800
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	409,532	378,761
1-4 Family | Real Estate Loan | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	234
Fiscal year before current fiscal year	151	0
Two years before current fiscal year	139	1,934
Three years before current fiscal year	40	499
Four years before current fiscal year	182	2,601
Prior	1,149	1,196
Revolving Loans	129	41
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,790	6,505
1-4 Family | Real Estate Loan | Substandard
Credit Quality Information [Abstract]
Current fiscal year	255	355
Fiscal year before current fiscal year	340	496
Two years before current fiscal year	441	1,534
Three years before current fiscal year	366	1,302
Four years before current fiscal year	2,924	3,458
Prior	8,278	7,250
Revolving Loans	304	652
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 12,908	$ 15,047