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Investment Securities Contractual Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
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 $ 973 $ 527 $ 926
Due in 1 to 5 years, Securities available for sale, Amortized Cost 3,020 7,562 8,867
Due in 5 to 10 years, Securities available for sale, Amortized Cost 22,843 19,647 9,459
Due after 10 years, Securities available for sale, Amortized Cost 248,032 190,194 189,985
Equity securities, Amortized Cost 3,258 3,381 3,129
Amortized Cost 278,126 221,311 212,366
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) 974 530 937
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) 3,106 7,727 9,077
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) 23,503 20,055 9,872
Due after 10 years, Securities available for sale, Fair Value (Estimated) 251,415 191,304 192,914
Equity securities, Fair Value (Estimated) 3,295 3,423 3,133
Fair Value (Estimated) 282,293 223,039 215,933
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]      
Due in 1 year or less, Securities available to be held to maturity, Amortized Cost 1,772 1,814 1,362
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost 13,428 6,306 6,861
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost 39,832 58,397 49,095
Due after 10 years, Securities to be held to maturity, Amortized Cost 133,738 173,506 188,004
Securities to be held to maturity, Amortized Cost 188,770 240,023 245,322
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]      
Due in 1 year or less, Securities available to be held to maturity, Fair Value (Estimated) 1,783 1,850 1,378
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) 13,782 6,514 7,140
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) 41,423 60,196 50,778
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) 138,809 174,563 189,048
Fair Value (Estimated) $ 195,797 $ 243,123 $ 248,344