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Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | $ 70,982 |  | $ 70,982 |  | $ 83,146
Unpaid principal balances | 71,084 |  | 71,084 |  | 83,337
Valuation allowance | 3,608 |  | 3,608 |  | 3,964
Average recorded investment | 73,649 | $ 82,346 | 81,612 | $ 73,284 |
Interest income recognized | 0 | 84 | 176 | 337 |
Impaired loans with an allowance: |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 44,749 |  | 44,749 |  | 44,794
Unpaid principal balances | 44,851 |  | 44,851 |  | 44,914
Valuation allowance | 3,608 |  | 3,608 |  | 3,964
Average recorded investment | 44,265 | 37,168 | 46,633 | 32,070 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 13,462 |  | 13,462 |  | 14,114
Unpaid principal balances | 13,472 |  | 13,472 |  | 14,124
Valuation allowance | 1,021 |  | 1,021 |  | 724
Average recorded investment | 13,050 | 13,474 | 14,689 | 9,297 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 19,245 |  | 19,245 |  | 19,864
Unpaid principal balances | 19,368 |  | 19,368 |  | 19,991
Valuation allowance | 1,065 |  | 1,065 |  | 1,443
Average recorded investment | 19,508 | 14,162 | 20,887 | 11,476 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 275 |  | 275 |  | 581
Unpaid principal balances | 271 |  | 271 |  | 579
Valuation allowance | 15 |  | 15 |  | 28
Average recorded investment | 451 | 1,150 | 587 | 1,301 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 11,591 |  | 11,591 |  | 9,252
Unpaid principal balances | 11,566 |  | 11,566 |  | 9,215
Valuation allowance | 1,497 |  | 1,497 |  | 1,441
Average recorded investment | 11,113 | 7,470 | 10,070 | 9,345 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Consumer and other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 176 |  | 176 |  | 983
Unpaid principal balances | 174 |  | 174 |  | 1,005
Valuation allowance | 10 |  | 10 |  | 328
Average recorded investment | 143 | 912 | 400 | 651 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 26,233 |  | 26,233 |  | 38,352
Unpaid principal balances | 26,233 |  | 26,233 |  | 38,423
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 29,384 | 45,178 | 34,979 | 41,214 |
Interest income recognized | 0 | 84 | 176 | 337 |
Impaired loans without an allowance: | Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 8,356 |  | 8,356 |  | 14,724
Unpaid principal balances | 8,366 |  | 8,366 |  | 14,739
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 9,344 | 22,029 | 12,521 | 18,702 |
Interest income recognized | 0 | 84 | 176 | 337 |
Impaired loans without an allowance: | Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 4,960 |  | 4,960 |  | 7,247
Unpaid principal balances | 4,958 |  | 4,958 |  | 7,271
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 7,922 | 5,699 | 8,381 | 5,034 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 20 |  | 20 |  | 1,786
Unpaid principal balances | 19 |  | 19 |  | 1,786
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 10 | 1,442 | 452 | 1,382 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 12,897 |  | 12,897 |  | 14,595
Unpaid principal balances | 12,890 |  | 12,890 |  | 14,627
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 12,108 | 16,008 | 13,625 | 16,096 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Consumer and other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balances | 0 |  | 0 |  | 0
Valuation allowance | 0 |  | 0 |  | $ 0
Average recorded investment | 0 | 0 | 0 | 0 |
Interest income recognized | $ 0 | $ 0 | $ 0 | $ 0 |

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