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Loans and Allowance for Credit Losses - Loan Portfolio Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans Receivable Aging Analysis [Abstract]
Total Past Due	$ 15,436	$ 13,849
Current	3,927,663	3,124,570
Total Loans Receivable	3,943,099	3,138,419
Total Loans> 90 Days &Accruing	0	0
Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	10,657	9,372
Current	2,537,710	2,057,142
Total Loans Receivable	2,548,367	2,066,514
Total Loans> 90 Days &Accruing	0	0
Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	355	128
Current	165,021	122,351
Total Loans Receivable	165,376	122,479
Total Loans> 90 Days &Accruing	0	0
Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	34	1,232
Current	269,618	253,109
Total Loans Receivable	269,652	254,341
Total Loans> 90 Days &Accruing	0	0
Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	5,158	4,259
Current	407,312	321,503
Total Loans Receivable	412,470	325,762
Total Loans> 90 Days &Accruing	0	0
Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,137	0
Current	296,847	189,632
Total Loans Receivable	297,984	189,632
Total Loans> 90 Days &Accruing	0	0
Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	3,973	3,753
Current	1,398,912	1,170,547
Total Loans Receivable	1,402,885	1,174,300
Total Loans> 90 Days &Accruing	0	0
Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,300	279
Current	118,770	137,073
Total Loans Receivable	121,070	137,352
Total Loans> 90 Days &Accruing	0	0
Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,112	3,854
Current	1,015,288	734,459
Total Loans Receivable	1,017,400	738,313
Total Loans> 90 Days &Accruing	0	0
Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	308	344
Current	91,397	77,658
Total Loans Receivable	91,705	78,002
Total Loans> 90 Days &Accruing	0	0
All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	59	0
Current	164,498	118,238
Total Loans Receivable	164,557	118,238
Total Loans> 90 Days &Accruing	0	0
Financial Asset, 30 to 59 Days Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	5,193	7,551
Financial Asset, 30 to 59 Days Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,324	4,937
Financial Asset, 30 to 59 Days Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	227	0
Financial Asset, 30 to 59 Days Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	1,198
Financial Asset, 30 to 59 Days Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,212	1,121
Financial Asset, 30 to 59 Days Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	39	0
Financial Asset, 30 to 59 Days Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	846	2,618
Financial Asset, 30 to 59 Days Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,153	43
Financial Asset, 30 to 59 Days Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	535	2,426
Financial Asset, 30 to 59 Days Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	122	145
Financial Asset, 30 to 59 Days Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	59	0
Financial Asset, 60 to 89 Days Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	5,096	1,538
Financial Asset, 60 to 89 Days Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,664	1,480
Financial Asset, 60 to 89 Days Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, 60 to 89 Days Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	34
Financial Asset, 60 to 89 Days Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,400	1,105
Financial Asset, 60 to 89 Days Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,098	0
Financial Asset, 60 to 89 Days Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,166	341
Financial Asset, 60 to 89 Days Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	125	0
Financial Asset, 60 to 89 Days Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	257	8
Financial Asset, 60 to 89 Days Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	50	50
Financial Asset, 60 to 89 Days Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due
Loans Receivable Aging Analysis [Abstract]
Total Past Due	5,147	4,760
Financial Asset, Equal to or Greater than 90 Days Past Due | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	3,669	2,955
Financial Asset, Equal to or Greater than 90 Days Past Due | Construction and Land Development | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	128	128
Financial Asset, Equal to or Greater than 90 Days Past Due | Agricultural | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	34	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential Properties | Real Estate Loan | 1-4 Family
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,546	2,033
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential Properties | Real Estate Loan | Multifamily
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial | Real Estate Loan
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,961	794
Financial Asset, Equal to or Greater than 90 Days Past Due | Agricultural Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	22	236
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial and Industrial Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,320	1,420
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	136	149
Financial Asset, Equal to or Greater than 90 Days Past Due | All Other Loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	$ 0	$ 0

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