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Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | $ 80,832 |  | $ 80,832 |  | $ 58,979
Unpaid principal balances | 81,076 |  | 81,076 |  | 59,354
Valuation allowance | 2,328 |  | 2,328 |  | 2,198
Average recorded investment | 75,149 | $ 32,915 | 69,759 | $ 33,197 |
Cash payments received on nonaccrual loans | 0 |  | 0 | 65 |
Interest income recognized | 0 | 16 | 0 | 65 |
Impaired loans with an allowance: |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 37,876 |  | 37,876 |  | 24,921
Unpaid principal balances | 38,032 |  | 38,032 |  | 25,114
Valuation allowance | 2,328 |  | 2,328 |  | 2,198
Average recorded investment | 33,450 | 17,364 | 30,607 | 14,378 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 16,667 |  | 16,667 |  | 1,850
Unpaid principal balances | 16,698 |  | 16,698 |  | 1,863
Valuation allowance | 1,092 |  | 1,092 |  | 95
Average recorded investment | 12,527 | 395 | 8,968 | 410 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 12,577 |  | 12,577 |  | 8,028
Unpaid principal balances | 12,624 |  | 12,624 |  | 8,079
Valuation allowance | 433 |  | 433 |  | 410
Average recorded investment | 11,066 | 4,437 | 10,053 | 4,058 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 1,737 |  | 1,737 |  | 2,522
Unpaid principal balances | 1,738 |  | 1,738 |  | 2,528
Valuation allowance | 33 |  | 33 |  | 66
Average recorded investment | 1,059 | 77 | 1,547 | 79 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 6,032 |  | 6,032 |  | 12,521
Unpaid principal balances | 6,086 |  | 6,086 |  | 12,644
Valuation allowance | 588 |  | 588 |  | 1,627
Average recorded investment | 7,976 | 11,778 | 9,491 | 9,203 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans with an allowance: | Consumer and other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 863 |  | 863 |  | 0
Unpaid principal balances | 886 |  | 886 |  | 0
Valuation allowance | 182 |  | 182 |  | 0
Average recorded investment | 822 | 677 | 548 | 628 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 42,956 |  | 42,956 |  | 34,058
Unpaid principal balances | 43,044 |  | 43,044 |  | 34,240
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 41,699 | 15,551 | 39,152 | 18,819 |
Interest income recognized | 0 | 16 | 0 | 65 |
Impaired loans without an allowance: | Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 22,601 |  | 22,601 |  | 16,364
Unpaid principal balances | 22,684 |  | 22,684 |  | 16,514
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 18,493 | 2,599 | 17,783 | 2,502 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 5,016 |  | 5,016 |  | 4,144
Unpaid principal balances | 5,036 |  | 5,036 |  | 4,174
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 4,805 | 5,722 | 4,585 | 5,695 |
Interest income recognized | 0 | 0 | 0 | 0 |
Impaired loans without an allowance: | Construction and land development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 0 |  | 0 |  | 2,645
Unpaid principal balances | 0 |  | 0 |  | 2,650
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 0 | 1,031 | 882 | 1,730 |
Cash payments received on nonaccrual loans |  | 16 |  |  |
Interest income recognized | 0 |  | 0 | 65 |
Impaired loans without an allowance: | Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 15,339 |  | 15,339 |  | 10,905
Unpaid principal balances | 15,324 |  | 15,324 |  | 10,902
Valuation allowance | 0 |  | 0 |  | 0
Average recorded investment | 18,401 | 6,199 | 15,902 | 8,892 |
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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