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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, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | $ 96,004 |  | $ 83,146
Unpaid principal balances | 96,172 |  | 83,337
Valuation allowance | 5,518 |  | 3,964
Average recorded investment | 89,575 | $ 64,223 |
Interest income recognized | 87 | 101 |
Impaired loans with an allowance: |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 53,208 |  | 44,794
Unpaid principal balances | 53,316 |  | 44,914
Valuation allowance | 5,518 |  | 3,964
Average recorded investment | 49,001 | 26,972 |
Interest income recognized | 0 | 0 |
Impaired loans with an allowance: | Commercial real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 18,539 |  | 14,114
Unpaid principal balances | 18,543 |  | 14,124
Valuation allowance | 1,521 |  | 724
Average recorded investment | 16,327 | 5,119 |
Interest income recognized | 0 | 0 |
Impaired loans with an allowance: | Consumer real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 24,668 |  | 19,864
Unpaid principal balances | 24,784 |  | 19,991
Valuation allowance | 2,381 |  | 1,443
Average recorded investment | 22,266 | 8,792 |
Interest income recognized | 0 | 0 |
Impaired loans with an allowance: | Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 868 |  | 581
Unpaid principal balances | 864 |  | 579
Valuation allowance | 55 |  | 28
Average recorded investment | 724 | 1,451 |
Interest income recognized | 0 | 0 |
Impaired loans with an allowance: | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 8,802 |  | 9,252
Unpaid principal balances | 8,773 |  | 9,215
Valuation allowance | 1,461 |  | 1,441
Average recorded investment | 9,027 | 11,220 |
Interest income recognized | 0 | 0 |
Impaired loans with an allowance: | Consumer and other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 331 |  | 983
Unpaid principal balances | 352 |  | 1,005
Valuation allowance | 100 |  | 328
Average recorded investment | 657 | 390 |
Interest income recognized | 0 | 0 |
Impaired loans without an allowance: |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 42,796 |  | 38,352
Unpaid principal balances | 42,856 |  | 38,423
Valuation allowance | 0 |  | 0
Average recorded investment | 40,574 | 37,251 |
Interest income recognized | 87 | 101 |
Impaired loans without an allowance: | Commercial real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 16,674 |  | 14,724
Unpaid principal balances | 16,678 |  | 14,739
Valuation allowance | 0 |  | 0
Average recorded investment | 15,699 | 15,375 |
Interest income recognized | 87 | 101 |
Impaired loans without an allowance: | Consumer real estate - mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 10,431 |  | 7,247
Unpaid principal balances | 10,466 |  | 7,271
Valuation allowance | 0 |  | 0
Average recorded investment | 8,839 | 4,369 |
Interest income recognized | 0 | 0 |
Impaired loans without an allowance: | Construction and land development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 0 |  | 1,786
Unpaid principal balances | 0 |  | 1,786
Valuation allowance | 0 |  | 0
Average recorded investment | 893 | 1,322 |
Interest income recognized | 0 | 0 |
Impaired loans without an allowance: | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 15,691 |  | 14,595
Unpaid principal balances | 15,712 |  | 14,627
Valuation allowance | 0 |  | 0
Average recorded investment | 15,143 | 16,185 |
Interest income recognized | 0 | 0 |
Impaired loans without an allowance: | 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 |

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