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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, 2021	Dec. 31, 2020
Credit Quality Information [Abstract]
Current fiscal year	$ 311,283	$ 1,085,080
Fiscal year before current fiscal year	1,362,003	558,953
Two years before current fiscal year	666,851	386,847
Three years before current fiscal year	478,577	300,829
Four years before current fiscal year	330,702	247,242
Prior	758,424	517,313
Revolving Loans	35,259	42,155
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,943,099	3,138,419
Pass
Credit Quality Information [Abstract]
Current fiscal year	293,386	1,052,257
Fiscal year before current fiscal year	1,349,288	511,427
Two years before current fiscal year	618,277	367,652
Three years before current fiscal year	463,515	279,274
Four years before current fiscal year	308,277	230,730
Prior	691,797	459,453
Revolving Loans	34,265	40,363
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,758,805	2,941,156
Special Mention
Credit Quality Information [Abstract]
Current fiscal year	17,058	29,692
Fiscal year before current fiscal year	10,208	44,049
Two years before current fiscal year	45,041	8,731
Three years before current fiscal year	5,078	15,165
Four years before current fiscal year	14,870	9,344
Prior	34,063	30,525
Revolving Loans	57	293
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	126,375	137,799
Substandard
Credit Quality Information [Abstract]
Current fiscal year	839	3,131
Fiscal year before current fiscal year	2,507	3,477
Two years before current fiscal year	3,533	10,464
Three years before current fiscal year	9,984	6,390
Four years before current fiscal year	7,555	7,168
Prior	32,564	27,335
Revolving Loans	937	1,499
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	57,919	59,464
Agricultural Loans
Credit Quality Information [Abstract]
Current fiscal year	15,629	104,515
Fiscal year before current fiscal year	87,163	20,401
Two years before current fiscal year	10,808	6,697
Three years before current fiscal year	5,370	2,062
Four years before current fiscal year	1,837	783
Prior	263	2,894
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	121,070	137,352
Agricultural Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	1,853	83,377
Fiscal year before current fiscal year	83,342	15,680
Two years before current fiscal year	6,921	5,978
Three years before current fiscal year	5,131	1,838
Four years before current fiscal year	1,631	635
Prior	104	2,856
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	98,982	110,364
Agricultural Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	13,723	21,070
Fiscal year before current fiscal year	3,777	4,483
Two years before current fiscal year	3,769	694
Three years before current fiscal year	214	224
Four years before current fiscal year	206	148
Prior	159	38
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	21,848	26,657
Agricultural Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	53	68
Fiscal year before current fiscal year	44	238
Two years before current fiscal year	118	25
Three years before current fiscal year	25	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	240	331
Consumer Loans
Credit Quality Information [Abstract]
Current fiscal year	7,736	31,624
Fiscal year before current fiscal year	35,935	21,424
Two years before current fiscal year	33,343	12,219
Three years before current fiscal year	11,637	8,375
Four years before current fiscal year	217	3,218
Prior	2,837	1,142
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	91,705	78,002
Consumer Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	7,723	31,609
Fiscal year before current fiscal year	35,908	21,384
Two years before current fiscal year	33,307	12,084
Three years before current fiscal year	11,526	8,279
Four years before current fiscal year	138	3,150
Prior	2,681	1,022
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	91,283	77,528
Consumer Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	24
Two years before current fiscal year	23	24
Three years before current fiscal year	21	1
Four years before current fiscal year	0	1
Prior	0	0
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	44	50
Consumer Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	13	15
Fiscal year before current fiscal year	27	16
Two years before current fiscal year	13	111
Three years before current fiscal year	90	95
Four years before current fiscal year	79	67
Prior	156	120
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	378	424
Commercial and Industrial Loans
Credit Quality Information [Abstract]
Current fiscal year	154,044	376,688
Fiscal year before current fiscal year	480,758	166,638
Two years before current fiscal year	198,271	71,878
Three years before current fiscal year	99,775	81,068
Four years before current fiscal year	98,877	43,676
Prior	150,232	116,603
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,181,957	856,551
Commercial and Industrial Loans | Pass
Credit Quality Information [Abstract]
Current fiscal year	152,091	371,683
Fiscal year before current fiscal year	477,167	132,148
Two years before current fiscal year	162,411	70,497
Three years before current fiscal year	98,524	78,890
Four years before current fiscal year	96,059	42,439
Prior	145,657	114,904
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,131,909	810,561
Commercial and Industrial Loans | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	1,556	4,116
Fiscal year before current fiscal year	3,248	32,130
Two years before current fiscal year	33,491	849
Three years before current fiscal year	804	489
Four years before current fiscal year	473	1,101
Prior	1,895	730
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	41,467	39,415
Commercial and Industrial Loans | Substandard
Credit Quality Information [Abstract]
Current fiscal year	397	889
Fiscal year before current fiscal year	343	2,360
Two years before current fiscal year	2,369	532
Three years before current fiscal year	447	1,689
Four years before current fiscal year	2,345	136
Prior	2,680	969
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	8,581	6,575
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,548,367	2,066,514
Real Estate Loan | Construction and Land Development
Credit Quality Information [Abstract]
Current fiscal year	6,259	41,842
Fiscal year before current fiscal year	55,930	41,117
Two years before current fiscal year	35,910	31,500
Three years before current fiscal year	44,866	3,277
Four years before current fiscal year	12,641	871
Prior	9,770	3,872
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	165,376	122,479
Real Estate Loan | Construction and Land Development | Pass
Credit Quality Information [Abstract]
Current fiscal year	6,259	41,842
Fiscal year before current fiscal year	55,930	40,989
Two years before current fiscal year	35,782	31,500
Three years before current fiscal year	44,866	2,760
Four years before current fiscal year	12,068	871
Prior	9,723	3,822
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	164,628	121,784
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	128
Two years before current fiscal year	128	0
Three years before current fiscal year	0	517
Four years before current fiscal year	573	0
Prior	47	50
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	748	695
Real Estate Loan | Agricultural
Credit Quality Information [Abstract]
Current fiscal year	30,356	75,475
Fiscal year before current fiscal year	101,331	38,382
Two years before current fiscal year	35,419	39,172
Three years before current fiscal year	41,060	16,815
Four years before current fiscal year	15,749	14,729
Prior	45,737	69,768
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	269,652	254,341
Real Estate Loan | Agricultural | Pass
Credit Quality Information [Abstract]
Current fiscal year	29,531	73,630
Fiscal year before current fiscal year	101,049	34,412
Two years before current fiscal year	31,082	37,839
Three years before current fiscal year	39,931	16,138
Four years before current fiscal year	14,717	13,559
Prior	38,968	58,291
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	255,278	233,869
Real Estate Loan | Agricultural | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	825	1,845
Fiscal year before current fiscal year	282	3,970
Two years before current fiscal year	4,337	533
Three years before current fiscal year	422	469
Four years before current fiscal year	407	1,106
Prior	6,472	11,232
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	12,745	19,155
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	800
Three years before current fiscal year	707	208
Four years before current fiscal year	625	64
Prior	297	245
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,629	1,317
Real Estate Loan | Commercial
Credit Quality Information [Abstract]
Current fiscal year	67,998	373,082
Fiscal year before current fiscal year	485,480	238,459
Two years before current fiscal year	320,122	184,780
Three years before current fiscal year	233,337	161,567
Four years before current fiscal year	176,487	155,046
Prior	417,445	250,998
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,700,869	1,363,932
Real Estate Loan | Commercial | Pass
Credit Quality Information [Abstract]
Current fiscal year	67,044	368,750
Fiscal year before current fiscal year	480,974	237,119
Two years before current fiscal year	318,800	171,591
Three years before current fiscal year	223,168	148,283
Four years before current fiscal year	163,413	143,400
Prior	377,041	215,616
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,630,440	1,284,759
Real Estate Loan | Commercial | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	954	2,469
Fiscal year before current fiscal year	2,712	1,300
Two years before current fiscal year	1,285	6,108
Three years before current fiscal year	3,268	11,262
Four years before current fiscal year	11,070	6,741
Prior	24,347	16,947
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	43,636	44,827
Real Estate Loan | Commercial | Substandard
Credit Quality Information [Abstract]
Current fiscal year	0	1,863
Fiscal year before current fiscal year	1,794	40
Two years before current fiscal year	37	7,081
Three years before current fiscal year	6,901	2,022
Four years before current fiscal year	2,004	4,905
Prior	16,057	18,435
Revolving Loans	0	0
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	26,793	34,346
1-4 Family | Real Estate Loan | Residential Properties
Credit Quality Information [Abstract]
Current fiscal year	29,261	81,854
Fiscal year before current fiscal year	115,406	32,532
Two years before current fiscal year	32,978	40,601
Three years before current fiscal year	42,532	27,665
Four years before current fiscal year	24,894	28,919
Prior	132,140	72,036
Revolving Loans	35,259	42,155
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	412,470	325,762
1-4 Family | Real Estate Loan | Residential Properties | Pass
Credit Quality Information [Abstract]
Current fiscal year	28,885	81,366
Fiscal year before current fiscal year	114,918	29,695
Two years before current fiscal year	29,974	38,163
Three years before current fiscal year	40,369	23,086
Four years before current fiscal year	20,251	26,676
Prior	117,623	62,942
Revolving Loans	34,265	40,363
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	386,285	302,291
1-4 Family | Real Estate Loan | Residential Properties | Special Mention
Credit Quality Information [Abstract]
Current fiscal year	0	192
Fiscal year before current fiscal year	189	2,142
Two years before current fiscal year	2,136	523
Three years before current fiscal year	349	2,720
Four years before current fiscal year	2,714	247
Prior	1,190	1,578
Revolving Loans	57	293
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	6,635	7,695
1-4 Family | Real Estate Loan | Residential Properties | Substandard
Credit Quality Information [Abstract]
Current fiscal year	376	296
Fiscal year before current fiscal year	299	695
Two years before current fiscal year	868	1,915
Three years before current fiscal year	1,814	1,859
Four years before current fiscal year	1,929	1,996
Prior	13,327	7,516
Revolving Loans	937	1,499
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 19,550	$ 15,776

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