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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Held-to-maturity Securities, Amortized Cost    
Within one year $ 2,092 $ 13,473
After one but within five years 15,206 16,706
After five years through ten years 56,607 3,000
After ten years 81,217 11,259
Total 155,122 44,438
Held-to-maturity Securities, Fair Value    
Within one year 2,132 13,506
After one but within five years 15,565 17,150
After five years through ten years 56,979 3,125
After ten years 81,473 11,316
Total 156,149 45,097
Available-for-sale Securities, Amortized Cost    
Within one year 8,884 20,136
After one but within five years 67,085 58,334
After five years through ten years 101,756 113,576
After ten years 79,743 186,208
Total 257,468 378,254
Available-for-sale Securities, Fair Value    
Within one year 8,893 20,109
After one but within five years 67,065 58,267
After five years through ten years 101,880 110,842
After ten years 80,254 183,362
Total $ 258,092 $ 372,580