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Loans - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance $ 18,333   $ 18,333   $ 18,384
Recorded Investment With No Allowance 15,189   15,189   13,246
Recorded Investment With Allowance 3,173   3,173   5,437
Total Recorded Investment 18,362   18,362   18,683
Related Allowance 1,142   1,142   1,776
Average Recorded Investment 18,208 $ 19,469 18,390 $ 16,825 17,197
Interest Recognized 120 173 454 625 793
Accrued interest receivable     29   299
Impaired financing receivable, interest income, cash basis method 44 $ 64 173 $ 277  
Total commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 1,910   1,910   2,804
Recorded Investment With No Allowance 664   664   762
Recorded Investment With Allowance 1,254   1,254   2,054
Total Recorded Investment 1,918   1,918   2,816
Related Allowance 525   525   787
Average Recorded Investment     2,318   3,209
Interest Recognized     107   199
Commercial and business loans          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 1,646   1,646   2,513
Recorded Investment With No Allowance 398   398   470
Recorded Investment With Allowance 1,254   1,254   2,054
Total Recorded Investment 1,652   1,652   2,524
Related Allowance 525   525   787
Average Recorded Investment     2,039   2,955
Interest Recognized     93   179
Government program loans          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 264   264   291
Recorded Investment With No Allowance 266   266   292
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 266   266   292
Related Allowance 0   0   0
Average Recorded Investment     279   254
Interest Recognized     14   20
Total real estate mortgage          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 4,167   4,167   3,333
Recorded Investment With No Allowance 2,723   2,723   780
Recorded Investment With Allowance 1,456   1,456   2,565
Total Recorded Investment 4,179   4,179   3,345
Related Allowance 361   361   469
Average Recorded Investment     3,723   3,782
Interest Recognized     135   177
Commercial real estate loans          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 3,096   3,096   1,305
Recorded Investment With No Allowance 2,199   2,199   389
Recorded Investment With Allowance 906   906   919
Total Recorded Investment 3,105   3,105   1,308
Related Allowance 346   346   394
Average Recorded Investment     2,018   1,370
Interest Recognized     93   60
Single family residential loans          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 1,071   1,071   2,028
Recorded Investment With No Allowance 524   524   391
Recorded Investment With Allowance 550   550   1,646
Total Recorded Investment 1,074   1,074   2,037
Related Allowance 15   15   75
Average Recorded Investment     1,705   2,412
Interest Recognized     42   117
Home Improvement and Home Equity          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 0   0   0
Recorded Investment With No Allowance 0   0   0
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 0   0   0
Related Allowance 0   0   0
Average Recorded Investment     0   0
Interest Recognized     0   0
Real estate construction and development          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 11,529   11,529   11,663
Recorded Investment With No Allowance 11,529   11,529   11,663
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 11,529   11,529   11,663
Related Allowance 0   0   0
Average Recorded Investment     11,596   9,144
Interest Recognized     167   331
Agricultural loans          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 727   727   543
Recorded Investment With No Allowance 273   273   0
Recorded Investment With Allowance 463   463   818
Total Recorded Investment 736   736   818
Related Allowance 256   256   520
Average Recorded Investment     735   1,014
Interest Recognized     45   81
Total installment and student loans          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 0   0   41
Recorded Investment With No Allowance 0   0   41
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 0   0   41
Related Allowance $ 0   0   0
Average Recorded Investment     18   48
Interest Recognized     $ 0   $ 5