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, 2022	Dec. 31, 2021
Credit Quality Information [Abstract]
Current fiscal year	$ 383,780	$ 1,200,288
Fiscal year before current fiscal year	1,216,168	818,943
Two years before current fiscal year	793,781	547,593
Three years before current fiscal year	532,798	374,575
Four years before current fiscal year	393,170	247,554
Prior	1,088,280	763,077
Revolving Loans	46,584	43,493
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,454,561	3,995,523
Pass
Credit Quality Information [Abstract]
Current fiscal year	373,016	1,177,678
Fiscal year before current fiscal year	1,202,200	815,269
Two years before current fiscal year	790,036	527,037
Three years before current fiscal year	519,908	367,606
Four years before current fiscal year	381,784	225,557
Prior	1,038,744	726,479
Revolving Loans	45,912	42,800
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,351,600	3,882,426
Special Mention
Credit Quality Information [Abstract]
Current fiscal year	6,787	18,807
Fiscal year before current fiscal year	12,413	2,354
Two years before current fiscal year	2,012	11,947
Three years before current fiscal year	11,623	2,519
Four years before current fiscal year	3,765	13,769
Prior	27,520	16,798
Revolving Loans	40	41
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	64,160	66,235
Substandard
Credit Quality Information [Abstract]
Current fiscal year	3,977	3,803
Fiscal year before current fiscal year	1,555	1,320
Two years before current fiscal year	1,733	8,609
Three years before current fiscal year	1,267	4,450
Four years before current fiscal year	7,621	8,228
Prior	22,016	19,800
Revolving Loans	632	652
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	38,801	46,862
Agricultural Loans
Credit Quality Information [Abstract]
Current fiscal year	38,944	119,453
Fiscal year before current fiscal year	58,801	18,357
Two years before current fiscal year	12,206	8,260
Three years before current fiscal year	7,167	2,972
Four years before current fiscal year	2,459	937
Prior	2,131	1,505
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	121,708	151,484
Agricultural Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	35,055	105,378
Fiscal year before current fiscal year	48,882	17,903
Two years before current fiscal year	11,860	5,612
Three years before current fiscal year	4,502	2,822
Four years before current fiscal year	2,330	924
Prior	2,067	1,316
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	104,696	133,955
Agricultural Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	3,859	13,725
Fiscal year before current fiscal year	9,913	436
Two years before current fiscal year	346	2,648
Three years before current fiscal year	2,648	150
Four years before current fiscal year	129	13
Prior	64	64
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	16,959	17,036
Agricultural Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	30	350
Fiscal year before current fiscal year	6	18
Two years before current fiscal year	0	0
Three years before current fiscal year	17	0
Four years before current fiscal year	0	0
Prior	0	125
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	53	493
Commercial Industrial And Other Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	117,051	280,933
Fiscal year before current fiscal year	327,472	168,095
Two years before current fiscal year	149,849	121,298
Three years before current fiscal year	90,651	76,825
Four years before current fiscal year	58,815	23,389
Prior	294,460	305,214
Revolving Loans	39,894	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,078,192	975,754
Commercial Industrial And Other Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	116,681	279,814
Fiscal year before current fiscal year	326,191	167,662
Two years before current fiscal year	149,215	119,702
Three years before current fiscal year	88,980	76,022
Four years before current fiscal year	58,513	22,888
Prior	292,322	302,962
Revolving Loans	39,894	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,071,796	969,050
Commercial Industrial And Other Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	370	613
Fiscal year before current fiscal year	694	399
Two years before current fiscal year	274	1,463
Three years before current fiscal year	1,639	182
Four years before current fiscal year	174	477
Prior	1,023	819
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,174	3,953
Commercial Industrial And Other Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	506
Fiscal year before current fiscal year	587	34
Two years before current fiscal year	360	133
Three years before current fiscal year	32	621
Four years before current fiscal year	128	24
Prior	1,115	1,433
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,222	2,751
Consumer Loans
Credit Quality Information [Abstract]
Current fiscal year	11,327	28,601
Fiscal year before current fiscal year	29,516	19,145
Two years before current fiscal year	19,319	17,324
Three years before current fiscal year	16,541	6,192
Four years before current fiscal year	5,116	4,340
Prior	5,391	2,840
Revolving Loans	2,475	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	89,685	78,442
Consumer Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	11,315	27,948
Fiscal year before current fiscal year	29,356	19,033
Two years before current fiscal year	19,264	16,978
Three years before current fiscal year	16,484	5,505
Four years before current fiscal year	5,049	4,297
Prior	5,321	1,244
Revolving Loans	2,475	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	89,264	75,005
Consumer Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	68
Fiscal year before current fiscal year	64	54
Two years before current fiscal year	32	38
Three years before current fiscal year	35	9
Four years before current fiscal year	8	0
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	139	169
Consumer Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	12	585
Fiscal year before current fiscal year	96	58
Two years before current fiscal year	23	308
Three years before current fiscal year	22	678
Four years before current fiscal year	59	43
Prior	70	1,596
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	282	3,268
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,164,976	2,789,843
Real Estate Loan | Construction and Land Development
Credit Quality Information [Abstract]
Current fiscal year	7,333	38,766
Fiscal year before current fiscal year	47,327	34,774
Two years before current fiscal year	33,352	23,505
Three years before current fiscal year	26,873	34,841
Four years before current fiscal year	2,599	3,760
Prior	14,020	9,472
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	131,504	145,118
Real Estate Loan | Construction and Land Development | Pass
Credit Quality Information [Abstract]
Current fiscal year	7,333	38,656
Fiscal year before current fiscal year	47,220	34,774
Two years before current fiscal year	33,352	23,505
Three years before current fiscal year	26,873	34,358
Four years before current fiscal year	2,599	3,760
Prior	13,533	9,433
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	130,910	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	107	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	107	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	487	39
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	487	522
Real Estate Loan | Agricultural
Credit Quality Information [Abstract]
Current fiscal year	28,821	79,665
Fiscal year before current fiscal year	91,953	64,418
Two years before current fiscal year	65,248	30,133
Three years before current fiscal year	30,171	30,774
Four years before current fiscal year	39,952	12,268
Prior	24,421	62,014
Revolving Loans	427	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	280,993	279,272
Real Estate Loan | Agricultural | Pass
Credit Quality Information [Abstract]
Current fiscal year	27,996	78,793
Fiscal year before current fiscal year	91,907	64,159
Two years before current fiscal year	64,989	25,713
Three years before current fiscal year	26,672	30,203
Four years before current fiscal year	39,318	12,142
Prior	18,288	54,808
Revolving Loans	427	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	269,597	265,818
Real Estate Loan | Agricultural | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	825	872
Fiscal year before current fiscal year	46	259
Two years before current fiscal year	259	4,028
Three years before current fiscal year	3,499	384
Four years before current fiscal year	390	69
Prior	5,504	6,087
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	10,523	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	244	57
Prior	629	1,119
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	873	1,755
Real Estate Loan | Commercial And Multifamily Portfolio Segment
Credit Quality Information [Abstract]
Current fiscal year	163,182	573,392
Fiscal year before current fiscal year	565,280	419,254
Two years before current fiscal year	411,723	308,051
Three years before current fiscal year	320,324	176,922
Four years before current fiscal year	231,838	166,066
Prior	642,682	321,455
Revolving Loans	218	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,335,247	1,965,140
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Pass
Credit Quality Information [Abstract]
Current fiscal year	157,560	568,200
Fiscal year before current fiscal year	563,350	417,334
Two years before current fiscal year	409,771	299,973
Three years before current fiscal year	317,733	174,448
Four years before current fiscal year	224,746	150,811
Prior	614,381	304,585
Revolving Loans	218	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,287,759	1,915,351
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	1,733	3,185
Fiscal year before current fiscal year	1,431	1,206
Two years before current fiscal year	1,101	1,836
Three years before current fiscal year	1,887	1,295
Four years before current fiscal year	1,268	10,609
Prior	17,831	8,632
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	25,251	26,763
Real Estate Loan | Commercial And Multifamily Portfolio Segment | Substandard
Credit Quality Information [Abstract]
Current fiscal year	3,889	2,007
Fiscal year before current fiscal year	499	714
Two years before current fiscal year	851	6,242
Three years before current fiscal year	704	1,179
Four years before current fiscal year	5,824	4,646
Prior	10,470	8,238
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	22,237	23,026
1-4 Family | Real Estate Loan
Credit Quality Information [Abstract]
Current fiscal year	17,122	79,478
Fiscal year before current fiscal year	95,819	94,900
Two years before current fiscal year	102,084	39,022
Three years before current fiscal year	41,071	46,049
Four years before current fiscal year	52,391	36,794
Prior	105,175	60,577
Revolving Loans	3,570	43,493
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	417,232	400,313
1-4 Family | Real Estate Loan | Pass
Credit Quality Information [Abstract]
Current fiscal year	17,076	78,889
Fiscal year before current fiscal year	95,294	94,404
Two years before current fiscal year	101,585	35,554
Three years before current fiscal year	38,664	44,248
Four years before current fiscal year	49,229	30,735
Prior	92,832	52,131
Revolving Loans	2,898	42,800
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	397,578	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	158	0
Two years before current fiscal year	0	1,934
Three years before current fiscal year	1,915	499
Four years before current fiscal year	1,796	2,601
Prior	3,098	1,196
Revolving Loans	40	41
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	7,007	6,505
1-4 Family | Real Estate Loan | Substandard
Credit Quality Information [Abstract]
Current fiscal year	46	355
Fiscal year before current fiscal year	367	496
Two years before current fiscal year	499	1,534
Three years before current fiscal year	492	1,302
Four years before current fiscal year	1,366	3,458
Prior	9,245	7,250
Revolving Loans	632	652
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 12,647	$ 15,047