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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]      
Due in 1 year or less, Securities available for sale, Amortized Cost $ 268,000 $ 0 $ 34,000
Due in 1 to 5 years, Securities available for sale, Amortized Cost 21,771,000 13,501,000 9,349,000
Due in 5 to 10 years, Securities available for sale, Amortized Cost 102,117,000 83,954,000 71,309,000
Due after 10 years, Securities available for sale, Amortized Cost 194,932,000 226,354,000 230,549,000
Amortized Cost 319,088,000 323,809,000 311,241,000
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]      
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) 269,000 0 34,000
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) 21,976,000 13,518,000 9,341,000
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) 104,238,000 83,326,000 69,745,000
Due after 10 years, Securities available for sale, Fair Value (Estimated) 196,087,000 220,572,000 222,950,000
Securities available for sale, Fair Value (Estimated) 322,570,000 317,416,000 302,070,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]      
Due in 1 year or less, Securities to be held to maturity, Amortized Cost 1,337,000 1,432,000 1,327,000
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost 21,857,000 20,717,000 23,621,000
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost 186,409,000 157,544,000 155,096,000
Due after 10 years, Securities to be held to maturity, Amortized Cost 92,924,000 75,970,000 80,033,000
Securities to be held to maturity, Amortized Cost 302,527,000 255,663,000 260,077,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]      
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) 1,339,000 1,433,000 1,329,000
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) 22,026,000 20,778,000 23,698,000
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) 189,984,000 155,313,000 153,240,000
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) 94,726,000 73,376,000 78,049,000
Securities to be held to maturity, Fair Value (Estimated) $ 308,075,000 $ 250,900,000 $ 256,316,000