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Investment Securities - Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Held-to-maturity Securities, Amortized Cost |  |
Within one year | $ 3,230 | $ 2,151
After one but within five years | 14,458 | 15,577
After five years through ten years | 53,048 | 54,641
After ten years | 78,277 | 78,663
Total | 149,013 | 151,032
Held-to-maturity Securities, Fair Value |  |
Within one year | 3,256 | 2,172
After one but within five years | 14,599 | 15,791
After five years through ten years | 51,589 | 54,554
After ten years | 76,374 | 78,515
Total | 145,818 | 151,032
Available-for-sale Securities, Amortized Cost |  |
Within one year | 10,291 | 10,268
After one but within five years | 77,606 | 71,576
After five years through ten years | 225,526 | 129,723
After ten years | 118,448 | 122,718
Total | 431,871 | 334,285
Available-for-sale Securities, Fair Value |  |
Within one year | 10,281 | 10,272
After one but within five years | 76,619 | 71,237
After five years through ten years | 220,904 | 128,954
After ten years | 116,078 | 122,004
Total | $ 423,882 | $ 332,467

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