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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value $ 721,369 $ 641,382  
Held-to-maturity Securities, Fair Value 63,934 73,458  
Level 3 | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other Investments 0    
Fair Value 0 0  
Level 3 | Securities available for sale, at fair value | Recurring basis      
Level 3 Financial Instruments Measured at Fair Value      
Beginning balance 0 3,089  
Total gains:      
Included in other comprehensive income 0 4  
Purchases, sales, issuances and settlements      
Transfer in and/or out of Level 3   0 $ (3,093)
Ending balance 0 0 3,089
Change in unrealized gains relating to assets still held at the reporting date 0 0  
Level 3 | State tax credits held for sale, at fair value | Recurring basis      
Level 3 Financial Instruments Measured at Fair Value      
Beginning balance 400 3,585  
Total gains:      
Total gains: 14 101  
Purchases, sales, issuances and settlements      
Sales (414) (3,286)  
Ending balance 0 400 $ 3,585
Change in unrealized gains relating to assets still held at the reporting date 0 (885)  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other Investments 121    
Fair Value 0 0  
Significant Other Observable Inputs (Level 2) | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other Investments 0    
Fair Value 721,369 641,382  
Total Fair Value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 721,369 641,382  
Total Fair Value | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other Investments 121    
Fair Value 721,369 641,382  
Obligations of U.S. Government-sponsored enterprises      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 98,498 99,224  
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 98,498 99,224  
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 98,498 99,224  
Obligations of states and political subdivisions      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 26,810 34,642  
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 0  
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 26,810 34,642  
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 26,810 34,642  
Residential mortgage-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 586,136 507,516  
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 586,136 507,516  
Residential mortgage-backed securities | Total Fair Value | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 586,136 $ 507,516  
US Treasury Bill Securities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 9,925    
US Treasury Bill Securities [Member] | 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    
US Treasury Bill Securities [Member] | Significant Other Observable Inputs (Level 2) | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value 9,925    
US Treasury Bill Securities [Member] | Total Fair Value | Recurring basis      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value $ 9,925