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Investment Securities (Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Held-to-Maturity Securities:    
Held-to-maturity securities, Amortized Cost, Within one year $ 4,335  
Held-to-maturity securities, Fair Value, Within one year 4,339  
Held-to-maturity securities, Amortized Cost, After 1 through 5 years 2,077  
Held-to-maturity securities, Fair Value, After 1 through 5 years 2,115  
Held-to-maturity securities, Amortized Cost, Mortgage-backed securities 433  
Held-to-maturity securities, Fair Value, Mortgage-backed securities 448  
Held-to-maturity securities, Amortized Cost 6,845 $ 7,636
Held-to-maturity securities, Fair Value 6,902 7,749
Available-for-Sale Securities:    
Available-for-sale securities, Amortized Cost, Within one year 46,642  
Available-for-sale securities, Fair Value, Within one year 47,179  
Available-for-sale securities, Amortized Cost, After 1 through 5 years 37,623  
Available-for-sale securities, Fair Value, After 1 through 5 years 37,733  
Available-for-sale securities, Amortized Cost, After 5 through 10 years 227,010  
Available-for-sale securities, Fair Value, After 5 through 10 years 225,866  
Available-for-sale securities, Amortized Cost, After 10 years 177,702  
Available-for-sale securities, Fair Value, After 10 years 173,014  
Available-for-sale securities, Amortized Cost, Mortgage-backed securities 326,705  
Available-for-sale securities, Fair Value, Mortgage-backed securities 319,047  
Available-for-sale securities, Amortized Cost 815,682  
Available-for-sale securities, Fair Value $ 802,839 $ 720,128