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Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans with a specific allowance:
Recorded Balance	$ 21,598	$ 23,440
Unpaid Principal Balance	23,601	25,861
Specific Allowance	1,931	1,098
Loans without a specific allowance:
Recorded Balance	7,386	7,991
Unpaid Principal Balance	8,172	10,425
Total loans:
Recorded Balance	28,984	31,431
Unpaid Principal Balance	31,773	36,286
Real Estate Loan
Loans with a specific allowance:
Recorded Balance	17,963	15,568
Unpaid Principal Balance	18,381	16,269
Specific Allowance	1,267	788
Loans without a specific allowance:
Recorded Balance	5,602	5,960
Unpaid Principal Balance	6,097	6,507
Total loans:
Recorded Balance	23,565	21,528
Unpaid Principal Balance	24,478	22,776
Construction and Land Development | Real Estate Loan
Loans with a specific allowance:
Recorded Balance	516	256
Unpaid Principal Balance	516	256
Specific Allowance	246	0
Loans without a specific allowance:
Recorded Balance	162	41
Unpaid Principal Balance	175	41
Total loans:
Recorded Balance	678	297
Unpaid Principal Balance	691	297
Agricultural | Real Estate Loan
Loans with a specific allowance:
Recorded Balance	0	0
Unpaid Principal Balance	0	0
Specific Allowance	0	0
Loans without a specific allowance:
Recorded Balance	359	479
Unpaid Principal Balance	359	479
Total loans:
Recorded Balance	359	479
Unpaid Principal Balance	359	479
Residential Properties | Real Estate Loan | 1-4 Family
Loans with a specific allowance:
Recorded Balance	4,005	5,154
Unpaid Principal Balance	4,157	5,351
Specific Allowance	158	182
Loans without a specific allowance:
Recorded Balance	4,262	3,719
Unpaid Principal Balance	4,715	4,263
Total loans:
Recorded Balance	8,267	8,873
Unpaid Principal Balance	8,872	9,614
Residential Properties | Real Estate Loan | Multifamily
Loans with a specific allowance:
Recorded Balance	1,914	4,254
Unpaid Principal Balance	1,914	4,254
Specific Allowance	0	19
Loans without a specific allowance:
Recorded Balance	267	0
Unpaid Principal Balance	267	0
Total loans:
Recorded Balance	2,181	4,254
Unpaid Principal Balance	2,181	4,254
Commercial | Real Estate Loan
Loans with a specific allowance:
Recorded Balance	11,528	5,904
Unpaid Principal Balance	11,794	6,408
Specific Allowance	863	587
Loans without a specific allowance:
Recorded Balance	552	1,721
Unpaid Principal Balance	581	1,724
Total loans:
Recorded Balance	12,080	7,625
Unpaid Principal Balance	12,375	8,132
Agricultural Loans
Loans with a specific allowance:
Recorded Balance	0	85
Unpaid Principal Balance	228	669
Specific Allowance	0	8
Loans without a specific allowance:
Recorded Balance	659	724
Unpaid Principal Balance	431	140
Total loans:
Recorded Balance	659	809
Unpaid Principal Balance	659	809
Commercial and Industrial Loans
Loans with a specific allowance:
Recorded Balance	3,523	7,653
Unpaid Principal Balance	4,878	8,789
Specific Allowance	664	301
Loans without a specific allowance:
Recorded Balance	907	916
Unpaid Principal Balance	1,331	3,065
Total loans:
Recorded Balance	4,430	8,569
Unpaid Principal Balance	6,209	11,854
Consumer Loans
Loans with a specific allowance:
Recorded Balance	112	134
Unpaid Principal Balance	114	134
Specific Allowance	0	1
Loans without a specific allowance:
Recorded Balance	218	391
Unpaid Principal Balance	313	713
Total loans:
Recorded Balance	330	525
Unpaid Principal Balance	$ 427	$ 847

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