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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Held-to-maturity Securities, Amortized Cost    
Within one year $ 2,859 $ 2,151
After one but within five years 13,063 15,577
After five years through ten years 63,321 54,641
After ten years 91,409 78,663
Total 170,652 151,032
Held-to-maturity Securities, Fair Value    
Within one year 2,882 2,172
After one but within five years 13,147 15,791
After five years through ten years 61,350 54,554
After ten years 88,748 78,515
Total 166,127 151,032
Available-for-sale Securities, Amortized Cost    
Within one year 8,272 10,268
After one but within five years 79,662 71,576
After five years through ten years 216,584 129,723
After ten years 92,750 122,718
Total 397,268 334,285
Available-for-sale Securities, Fair Value    
Within one year 8,263 10,272
After one but within five years 78,514 71,237
After five years through ten years 210,650 128,954
After ten years 90,710 122,004
Total $ 388,137 $ 332,467