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Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | $ 108,337 |  | $ 101,634
Unpaid principal balances | 138,717 |  | 133,747
Valuation allowance | 2,804 |  | 2,317
Average recorded investment | 104,989 | $ 41,113 |
Interest income recognized | 0 | 49 |
Collateral dependent impaired loans: |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 56,079 |  | 50,712
Unpaid principal balances | 76,953 |  | 71,881
Valuation allowance | 2,040 |  | 521
Average recorded investment | 53,396 | 12,706 |
Interest income recognized | 0 | 49 |
Collateral dependent impaired loans: | Commercial real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 36,258 |  | 33,073
Unpaid principal balances | 43,809 |  | 40,771
Valuation allowance | 778 |  | 38
Average recorded investment | 34,666 | 2,100 |
Interest income recognized | 0 | 0 |
Collateral dependent impaired loans: | Consumer real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 5,166 |  | 6,314
Unpaid principal balances | 7,233 |  | 8,560
Valuation allowance | 0 |  | 115
Average recorded investment | 5,740 | 2,216 |
Interest income recognized | 0 | 0 |
Collateral dependent impaired loans: | Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 5,939 |  | 8,513
Unpaid principal balances | 11,537 |  | 14,115
Valuation allowance | 0 |  | 6
Average recorded investment | 7,226 | 2,078 |
Interest income recognized | 0 | 49 |
Collateral dependent impaired loans: | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 8,716 |  | 2,812
Unpaid principal balances | 14,374 |  | 8,435
Valuation allowance | 1,262 |  | 362
Average recorded investment | 5,764 | 6,312 |
Interest income recognized | 0 | 0 |
Collateral dependent impaired loans: | Consumer and other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 0 |  | 0
Unpaid principal balances | 0 |  | 0
Valuation allowance | 0 |  | 0
Average recorded investment | 0 | 0 |
Interest income recognized | 0 | 0 |
Cash flow dependent impaired loans: |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 52,258 |  | 50,922
Unpaid principal balances | 61,764 |  | 61,866
Valuation allowance | 764 |  | 1,796
Average recorded investment | 51,593 | 28,407 |
Interest income recognized | 0 | 0 |
Cash flow dependent impaired loans: | Commercial real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 6,808 |  | 5,944
Unpaid principal balances | 9,106 |  | 8,237
Valuation allowance | 93 |  | 95
Average recorded investment | 6,376 | 2,597 |
Interest income recognized | 0 | 0 |
Cash flow dependent impaired loans: | Consumer real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 20,200 |  | 19,904
Unpaid principal balances | 23,370 |  | 23,387
Valuation allowance | 296 |  | 411
Average recorded investment | 19,941 | 9,393 |
Interest income recognized | 0 | 0 |
Cash flow dependent impaired loans: | Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 1,017 |  | 3,222
Unpaid principal balances | 1,883 |  | 4,184
Valuation allowance | 13 |  | 12
Average recorded investment | 2,120 | 3,288 |
Interest income recognized | 0 | 0 |
Cash flow dependent impaired loans: | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 23,451 |  | 21,852
Unpaid principal balances | 26,595 |  | 26,058
Valuation allowance | 152 |  | 1,278
Average recorded investment | 22,669 | 12,440 |
Interest income recognized | 0 | 0 |
Cash flow dependent impaired loans: | Consumer and other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 782 |  | 0
Unpaid principal balances | 810 |  | 0
Valuation allowance | 210 |  | $ 0
Average recorded investment | 487 | 689 |
Interest income recognized | $ 0 | $ 0 |

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