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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
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 $ 176 $ 253 $ 973
Due in 1 to 5 years, Securities available for sale, Amortized Cost 856 2,251 3,020
Due in 5 to 10 years, Securities available for sale, Amortized Cost 33,550 21,043 22,843
Due after 10 years, Securities available for sale, Amortized Cost 262,429 275,033 248,032
Equity securities, Amortized Cost 3,257 3,274 3,258
Amortized Cost 300,268 301,854 278,126
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) 179 253 974
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) 859 2,298 3,106
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) 33,987 21,505 23,503
Due after 10 years, Securities available for sale, Fair Value (Estimated) 260,606 273,030 251,415
Equity securities, Fair Value (Estimated) 3,368 3,330 3,295
Securities available for sale, Fair Value (Estimated) 298,999 300,416 282,293
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]      
Due in 1 year or less, Securities to be held to maturity, Amortized Cost 552 906 1,772
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost 17,241 13,451 13,428
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost 37,218 41,588 39,832
Due after 10 years, Securities to be held to maturity, Amortized Cost 187,668 170,883 133,738
Securities to be held to maturity, Amortized Cost 242,679 226,828 188,770
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) 559 913 1,783
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) 17,485 13,714 13,782
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) 37,963 42,448 41,423
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) 189,014 168,462 138,809
Securities to be held to maturity, Fair Value (Estimated) $ 245,021 $ 225,537 $ 195,797