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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | $ 83,861 |  | $ 83,861 |  | $ 58,979
Unpaid principal balances | 84,041 |  | 84,041 |  | 59,354
Valuation allowance | 2,378 |  | 2,378 |  | 2,198
Average recorded investment | 82,346 | $ 39,516 | 73,284 | $ 36,293 |
Interest income recognized | 0 | 0 | 0 | 65 |
Impaired loans with an allowance: |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 36,460 |  | 36,460 |  | 24,921
Unpaid principal balances | 36,596 |  | 36,596 |  | 25,114
Valuation allowance | 2,378 |  | 2,378 |  | 2,198
Average recorded investment | 37,168 | 17,535 | 32,070 | 15,258 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 10,282 |  | 10,282 |  | 1,850
Unpaid principal balances | 10,305 |  | 10,305 |  | 1,863
Valuation allowance | 461 |  | 461 |  | 95
Average recorded investment | 13,474 | 264 | 9,297 | 350 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 15,746 |  | 15,746 |  | 8,028
Unpaid principal balances | 15,808 |  | 15,808 |  | 8,079
Valuation allowance | 490 |  | 490 |  | 410
Average recorded investment | 14,162 | 4,593 | 11,476 | 4,230 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 563 |  | 563 |  | 2,522
Unpaid principal balances | 564 |  | 564 |  | 2,528
Valuation allowance | 15 |  | 15 |  | 66
Average recorded investment | 1,150 | 81 | 1,301 | 78 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 8,908 |  | 8,908 |  | 12,521
Unpaid principal balances | 8,939 |  | 8,939 |  | 12,644
Valuation allowance | 1,265 |  | 1,265 |  | 1,627
Average recorded investment | 7,470 | 12,235 | 9,345 | 10,068 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Consumer and other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 961 |  | 961 |  | 0
Unpaid principal balances | 980 |  | 980 |  | 0
Valuation allowance | 147 |  | 147 |  | 0
Average recorded investment | 912 | 362 | 651 | 532 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 47,401 |  | 47,401 |  | 34,058
Unpaid principal balances | 47,445 |  | 47,445 |  | 34,240
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 45,178 | 21,981 | 41,214 | 21,035 |
Interest income recognized | 0 | 0 | 0 | 65 |
Impaired loans without an allowance: | Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 21,457 |  | 21,457 |  | 16,364
Unpaid principal balances | 21,481 |  | 21,481 |  | 16,514
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 22,029 | 6,981 | 18,702 | 4,638 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 6,382 |  | 6,382 |  | 4,144
Unpaid principal balances | 6,419 |  | 6,419 |  | 4,174
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 5,699 | 7,003 | 5,034 | 6,122 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 2,884 |  | 2,884 |  | 2,645
Unpaid principal balances | 2,883 |  | 2,883 |  | 2,650
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 1,442 | 1,324 | 1,382 | 1,702 |
Interest income recognized | 0 | 0 | 0 | 65 |
Impaired loans without an allowance: | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 16,678 |  | 16,678 |  | 10,905
Unpaid principal balances | 16,662 |  | 16,662 |  | 10,902
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 16,008 | 6,673 | 16,096 | 8,573 |
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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