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Investment Securities - Summary of Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, Due in 1 year or less $ 111 $ 253
Fair Value (Estimated), Due in 1 year or less 112 253
Amortized Cost, Due in 1 to 5 years 841 2,251
Fair Value (Estimated), Due in 1 to 5 years 842 2,298
Amortized Cost, Due in 5 to 10 years 29,003 21,043
Fair Value (Estimated), Due in 1 to 5 years 29,177 21,505
Amortized Cost, Due after 10 years 270,594 275,033
Fair Value (Estimated), Due after 10 years 266,627 273,030
Amortized Cost-Equity 3,296 3,274
Fair Value (Estimated)-Equity 3,414 3,330
Amortized Cost 303,845 301,854
Fair Value (Estimated) 300,172 300,416
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost, Due in 1 year or less 635 906
Fair Value (Estimated), Due in 1 year or less 637 913
Amortized Cost, Due in 1 to 5 years 18,059 13,451
Fair Value (Estimated), Due in 1 to 5 years 18,164 13,714
Amortized Cost, Due in 5 to 10 years 37,182 41,588
Fair Value (Estimated), Due in 1 to 5 years 37,719 42,448
Amortized Cost, Due after 10 years 200,691 170,883
Fair Value (Estimated), Due after 10 years 203,135 168,462
Amortized Cost 256,567 226,828
Fair Value (Estimated) $ 259,655 $ 225,537