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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Held to Maturity, Amortized Cost, Within one year $ 2,151 $ 13,473
Held to Maturity, Fair Value, Within one year 2,172 13,506
Available for Sale Securities, Amortized Cost, Within one year 10,268 20,136
Available for Sale Securities, Debt Maturities, Fair Value, Within one year 10,272 20,109
Held to Maturity, Amortized Cost, After one but within five years 15,577 16,706
Held to Maturity, Fair Value, After one but within five years 15,791 17,150
Available for Sale, Amortized Cost, After one but within five years 71,576 58,334
Available for Sale, Fair Value, After one but within five years 71,237 58,267
Held to Maturity, Amortized Cost, After five years through ten years 54,641 3,000
Held to Maturity, Fair Value, After five years through ten years 54,554 3,125
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 129,723 113,576
Available for Sale, Fair Value, After five years through ten years 128,954 110,842
Held to Maturity, Amortized Cost, After ten years 78,663 11,259
Held to Maturity, Fair Value, After ten years 78,515 11,316
Available for Sale, Amortized Cost, After five years through ten years 122,718 186,208
Available for Sale, Fair Value, After ten years 122,004 183,362
Held to Maturity, Amortized Cost, Total 151,032 44,438
Held-to-Maturity, Fair Value, Total 151,032 45,097
Available for Sale, Amortized Cost, Total 334,285 378,254
Available for Sale, Fair Value, Total $ 332,467 $ 372,580