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Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]    
Available-for-sale Securities, Due in one year or less, Amortized Cost $ 8,285  
Available-for-sale Securities, Due from one to five years, Amortized Cost 72,432  
Available-for-sale Securities, Due from five to ten years, Amortized Cost 40,439  
Available-for-sale Securities, Due after ten years, Amortized Cost 11,604  
Available-for-sale Securities, Amortized Cost 593,167 $ 620,594
Held-to-maturity Securities Debt Maturities, Amortized Cost [Abstract]    
Held-to-maturity Securities, Due from one to five years, Amortized Cost 1,719  
Held-to-maturity Securities, Due from five to ten years, Amortized Cost 13,532  
Held-to-maturity Securities, Due after ten years, Amortized Cost 8,779  
Held-to-maturity Securities, Amortized Cost 117,163 138,846
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Due in one year or less, Fair Value 8,268  
Available-for-sale Securities, Due from one to five years, Fair Value 71,826  
Available-for-sale Securities, Due from five to ten years, Fair Value 39,812  
Available-for-sale Securities, Due after ten years, Fair Value 11,738  
Total 583,236 608,560
Held-to-maturity Securities Debt Maturities, Fair Value [Abstract]    
Held-to-maturity Securities, Due from one to five years, Fair Value 1,732  
Held-to-maturity Securities, Due from five to ten years, Fair Value 13,546  
Held-to-maturity Securities, Due after ten years, Fair Value 8,867  
Total 117,277 138,082
Mortgage-Backed Securities    
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]    
Available-for-sale Securities, Not due at single maturity, Amortized Cost 457,315  
Held-to-maturity Securities Debt Maturities, Amortized Cost [Abstract]    
Held-to-maturity Securities, Mortgage-backed securities, Amortized Cost 93,133  
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Not due at single maturity, Fair Value 446,985  
Held-to-maturity Securities Debt Maturities, Fair Value [Abstract]    
Held-to-maturity Securities, Mortgage-backed securities, Fair Value 93,132  
Other Securities    
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]    
Available-for-sale Securities, Not due at single maturity, Amortized Cost 3,092  
Available-for-sale Securities, Amortized Cost 3,627 4,161
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]    
Available-for-sale Securities, Not due at single maturity, Fair Value 4,607  
Total $ 5,284 $ 4,847