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Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, Less than 12 months   $ 122,217
Unrealized Loss, Less than 12 months   1,174
Fair Value, 12 months or more   314,406
Unrealized Loss, 12 months or more   6,799
Fair Value, Total   436,623
Unrealized Losses, Total   7,973
Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, Less than 12 months $ 186,548 122,217
Unrealized Loss, Less than 12 months 3,901 1,174
Fair Value, 12 months or more 354,903 311,356
Unrealized Loss, 12 months or more 19,516 6,650
Fair Value, Total 541,451 433,573
Unrealized Losses, Total 23,417 7,824
Debt Securities | U.S. Government Agency Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, 12 months or more 984 986
Unrealized Loss, 12 months or more 15 13
Fair Value, Total 984 986
Unrealized Losses, Total 15 13
Debt Securities | Mortgage-backed Securities - Residential    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, Less than 12 months 137,314 107,611
Unrealized Loss, Less than 12 months 2,925 980
Fair Value, 12 months or more 322,378 290,258
Unrealized Loss, 12 months or more 17,506 6,170
Fair Value, Total 459,692 397,869
Unrealized Losses, Total 20,431 7,150
Debt Securities | Municipals, Tax Exempt    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, Less than 12 months 49,234 7,354
Unrealized Loss, Less than 12 months 976 101
Fair Value, 12 months or more 24,410 20,112
Unrealized Loss, 12 months or more 1,752 467
Fair Value, Total 73,644 27,466
Unrealized Losses, Total 2,728 568
Debt Securities | Treasury Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, Less than 12 months   7,252
Unrealized Loss, Less than 12 months   93
Fair Value, 12 months or more 7,131  
Unrealized Loss, 12 months or more 243  
Fair Value, Total 7,131 7,252
Unrealized Losses, Total $ 243 93
Equity and Other Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value, 12 months or more   3,050
Unrealized Loss, 12 months or more   149
Fair Value, Total   3,050
Unrealized Losses, Total   $ 149