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Loans and Allowance for Loan Losses - Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loans Receivable |  |  |
Impaired Financing Receivable, Recorded Investment | $ 9,048 | $ 10,267 | $ 13,939
Impaired Financing Receivable, Unpaid Principal Balance | 10,109 | 11,435 | 15,579
Impaired Financing Receivable, Related Allowance | 713 | 929 | 2,041
Impaired Financing Receivable, Average Recorded Investment | 9,739 | 12,487 | 20,004
Impaired Financing Receivable Interest Income Recognized | 533 | 839 | 1,346
Commercial construction |  |  |
Impaired Financing Receivable, Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance | 0 | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable Interest Income Recognized | 0 | 0 | 0
Commercial Real Estate |  |  |
Impaired Financing Receivable, Recorded Investment | 3,438 | 4,020 | 3,501
Impaired Financing Receivable, Unpaid Principal Balance | 3,472 | 4,049 | 3,665
Impaired Financing Receivable, Related Allowance | 445 | 517 | 613
Impaired Financing Receivable, Average Recorded Investment | 3,736 | 4,940 | 6,216
Impaired Financing Receivable Interest Income Recognized | 135 | 264 | 337
Industrial revenue bonds |  |  |
Impaired Financing Receivable, Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance | 0 | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable Interest Income Recognized | 0 | 0 | 0
Consumer auto |  |  |
Impaired Financing Receivable, Recorded Investment | 865 | 1,117 | 1,874
Impaired Financing Receivable, Unpaid Principal Balance | 964 | 1,334 | 2,114
Impaired Financing Receivable, Related Allowance | 140 | 181 | 336
Impaired Financing Receivable, Average Recorded Investment | 932 | 1,128 | 2,069
Impaired Financing Receivable Interest Income Recognized | 91 | 125 | 167
Home Equity Line of Credit |  |  |
Impaired Financing Receivable, Recorded Investment | 630 | 528 | 111
Impaired Financing Receivable, Unpaid Principal Balance | 668 | 548 | 128
Impaired Financing Receivable, Related Allowance | 5 | 4 | 17
Impaired Financing Receivable, Average Recorded Investment | 550 | 362 | 412
Impaired Financing Receivable Interest Income Recognized | 36 | 37 | 28
Land development |  |  |
Impaired Financing Receivable, Recorded Investment | 0 | 0 | 14
Impaired Financing Receivable, Unpaid Principal Balance | 0 | 0 | 18
Impaired Financing Receivable, Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 328 | 14
Impaired Financing Receivable Interest Income Recognized | 0 | 101 | 1
One- to four-family residential construction |  |  |
Impaired Financing Receivable, Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance | 0 | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable Interest Income Recognized | 0 | 0 | 0
Subdivision construction |  |  |
Impaired Financing Receivable, Recorded Investment | 20 | 251 | 318
Impaired Financing Receivable, Unpaid Principal Balance | 20 | 251 | 318
Impaired Financing Receivable, Related Allowance | 0 | 96 | 105
Impaired Financing Receivable, Average Recorded Investment | 115 | 277 | 321
Impaired Financing Receivable Interest Income Recognized | 3 | 9 | 17
Owner occupied one- to four-family residential |  |  |
Impaired Financing Receivable, Recorded Investment | 3,457 | 2,300 | 3,576
Impaired Financing Receivable, Unpaid Principal Balance | 3,776 | 2,423 | 3,926
Impaired Financing Receivable, Related Allowance | 90 | 82 | 285
Impaired Financing Receivable, Average Recorded Investment | 2,999 | 2,598 | 3,406
Impaired Financing Receivable Interest Income Recognized | 169 | 131 | 197
Non-owner occupied one- to four-family residential |  |  |
Impaired Financing Receivable, Recorded Investment | 69 | 409 | 2,222
Impaired Financing Receivable, Unpaid Principal Balance | 106 | 574 | 2,519
Impaired Financing Receivable, Related Allowance | 0 | 20 | 304
Impaired Financing Receivable, Average Recorded Investment | 309 | 954 | 2,870
Impaired Financing Receivable Interest Income Recognized | 18 | 43 | 158
Other residential |  |  |
Impaired Financing Receivable, Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance | 0 | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 1,026
Impaired Financing Receivable Interest Income Recognized | 0 | 0 | 20
Commercial business |  |  |
Impaired Financing Receivable, Recorded Investment | 166 | 1,286 | 1,844
Impaired Financing Receivable, Unpaid Principal Balance | 551 | 1,771 | 2,207
Impaired Financing Receivable, Related Allowance | 14 | 13 | 309
Impaired Financing Receivable, Average Recorded Investment | 800 | 1,517 | 2,932
Impaired Financing Receivable Interest Income Recognized | 34 | 81 | 362
Consumer other |  |  |
Impaired Financing Receivable, Recorded Investment | 403 | 356 | 479
Impaired Financing Receivable, Unpaid Principal Balance | 552 | 485 | 684
Impaired Financing Receivable, Related Allowance | 19 | 16 | 72
Impaired Financing Receivable, Average Recorded Investment | 298 | 383 | 738
Impaired Financing Receivable Interest Income Recognized | $ 47 | $ 48 | $ 59

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