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Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | $ 641,382 | $ 460,797 |
Held-to-maturity Securities, Fair Value | 73,458 | 79,639 |
Level 3 | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 3,089 |
Level 3 | Securities available for sale, at fair value | Recurring basis |  |  |
Level 3 Financial Instruments Measured at Fair Value |  |  |
Beginning balance | 3,089 | 3,077 |
Total gains: |  |  |
Included in other comprehensive income | 4 | 12 |
Purchases, sales, issuances and settlements |  |  |
Transfer in and/or out of Level 3 |  | (3,093) | $ 0
Ending balance | 0 | 3,089 | 3,077
Change in unrealized gains relating to assets still held at the reporting date | 0 | 12 |
Level 3 | State tax credits held for sale, at fair value | Recurring basis |  |  |
Level 3 Financial Instruments Measured at Fair Value |  |  |
Beginning balance | 3,585 | 5,941 |
Total gains: |  |  |
Total gains: | 101 | 177 |
Purchases, sales, issuances and settlements |  |  |
Sales | (3,286) | (2,533) |
Ending balance | 400 | 3,585 | $ 5,941
Change in unrealized gains relating to assets still held at the reporting date | 885 | (575) |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 641,382 | 457,708 |
Total Fair Value |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 641,382 | 460,797 |
Total Fair Value | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 641,382 | 460,797 |
Obligations of U.S. Government-sponsored enterprises |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 99,224 | 107,660 |
Obligations of U.S. Government-sponsored enterprises | Level 3 | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 0 |
Obligations of U.S. Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 0 |
Obligations of U.S. Government-sponsored enterprises | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 99,224 | 107,660 |
Obligations of U.S. Government-sponsored enterprises | Total Fair Value | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 99,224 | 107,660 |
Obligations of states and political subdivisions |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 34,642 | 36,631 |
Obligations of states and political subdivisions | Level 3 | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 3,089 |
Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 0 |
Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 34,642 | 33,542 |
Obligations of states and political subdivisions | Total Fair Value | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 34,642 | 36,631 |
Residential mortgage-backed securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 507,516 | 316,506 |
Residential mortgage-backed securities | Level 3 | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 0 |
Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 | 0 |
Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 507,516 | 316,506 |
Residential mortgage-backed securities | Total Fair Value | Recurring basis |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | $ 507,516 | $ 316,506 |

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