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Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Costs to sell | 8.50% |
Assets: |  |
Securities available for sale, at fair value | $ 1,846,265,000 | $ 1,720,257,000
Transfers between levels 1, 2 and 3 | 0 | 0
Collateralized Mortgage Obligations |  |
Assets: |  |
Securities available for sale, at fair value | 895,122,000 | 838,709,000
Mortgage-backed Securities, Residential |  |
Assets: |  |
Securities available for sale, at fair value | 402,605,000 | 471,214,000
Mortgage-backed Securities, Commercial |  |
Assets: |  |
Securities available for sale, at fair value | 469,126,000 | 301,365,000
Corporate securities |  |
Assets: |  |
Securities available for sale, at fair value | 3,826,000 | 4,475,000
Municipal securities |  |
Assets: |  |
Securities available for sale, at fair value | 75,586,000 | 82,537,000
Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value |  | 21,957,000
Recurring basis |  |
Assets: |  |
Interest rate swaps | 7,059,000 |
Interest rate swaps |  | 4,506,000
Mortgage banking derivatives | 10,000 | 33,000
Liabilities: |  |
Interest rate swaps | 7,059,000 | 4,506,000
Mortgage banking derivatives | 3,000 | 5,000
Recurring basis | Collateralized Mortgage Obligations |  |
Assets: |  |
Securities available for sale, at fair value | 895,122,000 | 838,709,000
Recurring basis | Mortgage-backed Securities, Residential |  |
Assets: |  |
Securities available for sale, at fair value | 402,605,000 | 471,214,000
Recurring basis | Mortgage-backed Securities, Commercial |  |
Assets: |  |
Securities available for sale, at fair value | 469,126,000 | 301,365,000
Recurring basis | Corporate securities |  |
Assets: |  |
Securities available for sale, at fair value | 3,826,000 | 4,475,000
Recurring basis | Municipal securities |  |
Assets: |  |
Securities available for sale, at fair value | 75,586,000 | 82,537,000
Recurring basis | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 23,405,000 | 21,957,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Interest rate swaps | 0 |
Interest rate swaps |  | 0
Mortgage banking derivatives | 0 | 0
Liabilities: |  |
Interest rate swaps | 0 | 0
Mortgage banking derivatives | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized Mortgage Obligations |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed Securities, Residential |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed Securities, Commercial |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 23,405,000 | 21,957,000
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Interest rate swaps | 7,059,000 |
Interest rate swaps |  | 4,506,000
Mortgage banking derivatives | 10,000 | 33,000
Liabilities: |  |
Interest rate swaps | 7,059,000 | 4,506,000
Mortgage banking derivatives | 3,000 | 5,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Collateralized Mortgage Obligations |  |
Assets: |  |
Securities available for sale, at fair value | 895,122,000 | 838,709,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed Securities, Residential |  |
Assets: |  |
Securities available for sale, at fair value | 402,605,000 | 471,214,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed Securities, Commercial |  |
Assets: |  |
Securities available for sale, at fair value | 469,126,000 | 301,365,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities |  |
Assets: |  |
Securities available for sale, at fair value | 3,826,000 | 4,475,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal securities |  |
Assets: |  |
Securities available for sale, at fair value | 74,527,000 | 81,429,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Interest rate swaps | 0 |
Interest rate swaps |  | 0
Mortgage banking derivatives | 0 | 0
Liabilities: |  |
Interest rate swaps | 0 | 0
Mortgage banking derivatives | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Collateralized Mortgage Obligations |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed Securities, Residential |  |
Assets: |  |
Securities available for sale, at fair value | 0 |
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed Securities, Commercial |  |
Assets: |  |
Securities available for sale, at fair value | 0 |
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate securities |  |
Assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Municipal securities |  |
Assets: |  |
Securities available for sale, at fair value | 1,059,000 | 1,108,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Mutual funds |  |
Assets: |  |
Securities available for sale, at fair value | $ 0 | $ 0
Accounts Receivable | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 20.00% |
Accounts Receivable | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 60.00% |
Inventories | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 50.00% |
Inventories | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 70.00% |

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