Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans with a specific allowance:
Recorded Balance	$ 17,525	$ 23,440
Unpaid Principal Balance	19,892	25,861
Specific Allowance	1,622	1,098
Loans without a specific allowance:
Recorded Balance	7,953	7,991
Unpaid Principal Balance	8,843	10,425
Total loans:
Recorded Balance	25,478	31,431
Unpaid Principal Balance	28,735	36,286
Real Estate Loan
Loans with a specific allowance:
Recorded Balance	13,765	15,568
Unpaid Principal Balance	14,475	16,269
Specific Allowance	1,280	788
Loans without a specific allowance:
Recorded Balance	5,744	5,960
Unpaid Principal Balance	6,358	6,507
Total loans:
Recorded Balance	19,509	21,528
Unpaid Principal Balance	20,833	22,776
Construction and Land Development | Real Estate Loan
Loans with a specific allowance:
Recorded Balance	525	256
Unpaid Principal Balance	525	256
Specific Allowance	254	0
Loans without a specific allowance:
Recorded Balance	163	41
Unpaid Principal Balance	176	41
Total loans:
Recorded Balance	688	297
Unpaid Principal Balance	701	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	356	479
Unpaid Principal Balance	356	479
Total loans:
Recorded Balance	356	479
Unpaid Principal Balance	356	479
Residential Properties | Real Estate Loan | 1-4 Family
Loans with a specific allowance:
Recorded Balance	4,835	5,154
Unpaid Principal Balance	5,069	5,351
Specific Allowance	168	182
Loans without a specific allowance:
Recorded Balance	4,172	3,719
Unpaid Principal Balance	4,646	4,263
Total loans:
Recorded Balance	9,007	8,873
Unpaid Principal Balance	9,715	9,614
Residential Properties | Real Estate Loan | Multifamily
Loans with a specific allowance:
Recorded Balance	1,920	4,254
Unpaid Principal Balance	1,920	4,254
Specific Allowance	0	19
Loans without a specific allowance:
Recorded Balance	276	0
Unpaid Principal Balance	276	0
Total loans:
Recorded Balance	2,196	4,254
Unpaid Principal Balance	2,196	4,254
Commercial | Real Estate Loan
Loans with a specific allowance:
Recorded Balance	6,485	5,904
Unpaid Principal Balance	6,961	6,408
Specific Allowance	858	587
Loans without a specific allowance:
Recorded Balance	777	1,721
Unpaid Principal Balance	904	1,724
Total loans:
Recorded Balance	7,262	7,625
Unpaid Principal Balance	7,865	8,132
Agricultural Loans
Loans with a specific allowance:
Recorded Balance	88	85
Unpaid Principal Balance	316	669
Specific Allowance	0	8
Loans without a specific allowance:
Recorded Balance	881	724
Unpaid Principal Balance	653	140
Total loans:
Recorded Balance	969	809
Unpaid Principal Balance	969	809
Commercial and Industrial Loans
Loans with a specific allowance:
Recorded Balance	3,543	7,653
Unpaid Principal Balance	4,972	8,789
Specific Allowance	341	301
Loans without a specific allowance:
Recorded Balance	1,081	916
Unpaid Principal Balance	1,484	3,065
Total loans:
Recorded Balance	4,624	8,569
Unpaid Principal Balance	6,456	11,854
Consumer Loans
Loans with a specific allowance:
Recorded Balance	129	134
Unpaid Principal Balance	129	134
Specific Allowance	1	1
Loans without a specific allowance:
Recorded Balance	247	391
Unpaid Principal Balance	348	713
Total loans:
Recorded Balance	376	525
Unpaid Principal Balance	$ 477	$ 847