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Securities Available-for-Sale - Amortized Cost and Fair Value of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 695,284 $ 686,205
Fair Value 698,291 693,487
Obligations of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost 58,501  
Due after one year through five years, Amortized Cost 141,646  
Due after five years through ten years, Amortized Cost 70,584  
Due after ten years, Amortized Cost 34,416  
Available-for-sale Securities, Debt Maturities, Amortized Cost 305,147  
Due in one year or less, Fair Value 58,438  
Due after one year through five years, Fair Value 142,859  
Due after five years through ten years, Fair Value 72,132  
Due after ten years, Fair Value 35,955  
Fair Value, Debt securities 309,384  
Collateralized mortgage obligations of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 109,916 130,046
Fair Value 108,688 129,777
Residential mortgage-backed securities of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,388 36,606
Fair Value 32,854 37,358
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 244,018 [1] 127,311
Fair Value 242,221 [1] 125,604
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 691,469 678,626
Fair Value 693,147 682,238
Marketable equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,815 7,579
Fair Value $ 5,144 $ 11,249
[1] Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.