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Investment Securities - Summary of Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities [Abstract]    
Amortized Cost, Due in 1 year or less $ 253 $ 527
Fair Value (Estimated), Due in 1 year or less 253 530
Amortized Cost, Due in 1 to 5 years 2,251 7,562
Fair Value (Estimated), Due in 1 to 5 years 2,298 7,727
Amortized Cost, Due in 5 to 10 years 21,043 19,647
Fair Value (Estimated), Due in 1 to 5 years 21,505 20,055
Amortized Cost, Due after 10 years 275,033 190,194
Fair Value (Estimated), Due after 10 years 273,030 191,304
Amortized Cost-Equity 3,274 3,381
Fair Value (Estimated)-Equity 3,330 3,423
Amortized Cost 301,854 221,311
Fair Value (Estimated) 300,416 223,039
Held-to-maturity Securities, Debt Maturities [Abstract]    
Amortized Cost, Due in 1 year or less 906 1,814
Fair Value (Estimated), Due in 1 year or less 913 1,850
Amortized Cost, Due in 1 to 5 years 13,451 6,306
Fair Value (Estimated), Due in 1 to 5 years 13,714 6,514
Amortized Cost, Due in 5 to 10 years 41,588 58,397
Fair Value (Estimated), Due in 1 to 5 years 42,448 60,196
Amortized Cost, Due after 10 years 170,883 173,506
Fair Value (Estimated), Due after 10 years 168,462 174,563
Amortized Cost 226,828 240,023
Fair Value (Estimated) $ 225,537 $ 243,123