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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]      
Due in 1 year or less, Securities available for sale, Amortized Cost $ 61 $ 111 $ 43
Due in 1 to 5 years, Securities available for sale, Amortized Cost 6,502 841 1,909
Due in 5 to 10 years, Securities available for sale, Amortized Cost 66,434 29,003 31,835
Due after 10 years, Securities available for sale, Amortized Cost 235,703 270,594 277,044
Equity securities, Amortized Cost 2,930 3,296 3,229
Amortized Cost 311,630 303,845 314,060
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) 61 112 43
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) 6,492 842 1,953
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) 65,234 29,177 32,471
Due after 10 years, Securities available for sale, Fair Value (Estimated) 229,052 266,627 274,865
Equity securities, Fair Value (Estimated) 2,930 3,414 3,292
Securities available for sale, Fair Value (Estimated) 303,769 300,172 312,624
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]      
Due in 1 year or less, Securities to be held to maturity, Amortized Cost 634 635 903
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost 25,692 18,059 12,213
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost 145,297 37,182 42,819
Due after 10 years, Securities to be held to maturity, Amortized Cost 87,067 200,691 184,894
Securities to be held to maturity, Amortized Cost 258,690 256,567 240,829
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) 635 637 908
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) 25,796 18,164 12,477
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) 144,211 37,719 43,562
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) 85,209 203,135 182,431
Securities to be held to maturity, Fair Value (Estimated) $ 255,851 $ 259,655 $ 239,378