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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 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 $ 26 $ 253 $ 2,058
Due in 1 to 5 years, Securities available for sale, Amortized Cost 1,722 2,251 3,326
Due in 5 to 10 years, Securities available for sale, Amortized Cost 34,382 21,043 24,917
Due after 10 years, Securities available for sale, Amortized Cost 269,650 275,033 201,839
Equity securities, Amortized Cost 3,266 3,274 3,034
Amortized Cost 309,046 301,854 235,174
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) 26 253 2,072
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) 1,758 2,298 3,432
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) 35,099 21,505 25,839
Due after 10 years, Securities available for sale, Fair Value (Estimated) 267,936 273,030 206,947
Equity securities, Fair Value (Estimated) 3,327 3,330 3,037
Securities available for sale, Fair Value (Estimated) 308,146 300,416 241,327
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]      
Due in 1 year or less, Securities to be held to maturity, Amortized Cost 707 906 1,847
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost 14,536 13,451 13,162
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost 41,373 41,588 42,679
Due after 10 years, Securities to be held to maturity, Amortized Cost 187,507 170,883 158,584
Securities to be held to maturity, Amortized Cost 244,123 226,828 216,272
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) 710 913 1,857
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) 14,813 13,714 13,538
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) 42,251 42,448 44,693
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) 188,464 168,462 165,112
Securities to be held to maturity, Fair Value (Estimated) $ 246,238 $ 225,537 $ 225,200