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Investment Securities Contractual Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 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 $ 2,058 $ 527 $ 2,396
Due in 1 to 5 years, Securities available for sale, Amortized Cost 3,326 7,562 22,945
Due in 5 to 10 years, Securities available for sale, Amortized Cost 24,917 19,647 8,993
Due after 10 years, Securities available for sale, Amortized Cost 201,839 190,194 174,831
Equity securities, Amortized Cost 3,034 3,381 3,129
Amortized Cost 235,174 221,311 212,294
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) 2,072 530 2,389
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) 3,432 7,727 22,860
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) 25,839 20,055 9,355
Due after 10 years, Securities available for sale, Fair Value (Estimated) 206,947 191,304 176,028
Equity securities, Fair Value (Estimated) 3,037 3,423 3,182
Fair Value (Estimated) 241,327 223,039 213,814
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 1,847 1,814 1,044
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost 13,162 6,306 12,532
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost 42,679 58,397 45,958
Due after 10 years, Securities to be held to maturity, Amortized Cost 158,584 173,506 189,716
Securities to be held to maturity, Amortized Cost 216,272 240,023 249,250
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) 1,857 1,850 1,056
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) 13,538 6,514 12,740
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) 44,693 60,196 47,525
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) 165,112 174,563 187,377
Fair Value (Estimated) $ 225,200 $ 243,123 $ 248,698