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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, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value $ 460,797 $ 451,770
Held-to-maturity Securities, Fair Value 79,639 43,441
Level 3 | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 3,089 3,077
Level 3 | Securities available for sale, at fair value | Recurring basis    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance 3,077 3,059
Total gains:    
Included in other comprehensive income 12 18
Purchases, sales, issuances and settlements    
Purchases, sales, issuances and settlements 0 0
Ending balance 3,089 3,077
Change in unrealized gains relating to assets still held at the reporting date 12 18
Level 3 | State tax credits held for sale, at fair value | Recurring basis    
Level 3 Financial Instruments Measured at Fair Value    
Beginning balance 5,941 11,689
Total gains:    
Total gains: 177 406
Purchases, sales, issuances and settlements    
Sales (2,533) (6,154)
Ending balance 3,585 5,941
Change in unrealized gains relating to assets still held at the reporting date 575 (1,212)
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 457,708 448,693
Total Fair Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 460,797 451,770
Total Fair Value | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 460,797 451,770
Obligations of U.S. Government-sponsored enterprises    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 107,660 99,008
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 107,660 99,008
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 107,660 99,008
Obligations of states and political subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 36,631 41,701
Obligations of states and political subdivisions | Level 3 | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 3,089 3,077
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 33,542 38,624
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 36,631 41,701
Residential mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value 316,506 311,061
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 316,506 311,061
Residential mortgage-backed securities | Total Fair Value | Recurring basis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value $ 316,506 $ 311,061