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Securities - Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost
One to five years	$ 425
Five to ten years	63,004
After ten years	185,591
Amortized Cost	249,020
Amortized cost	491,726	$ 481,357
Held-to-maturity securities, Five to ten years	14,286
Held-to-maturity securities, After ten years	5,914
Held-to-maturity securities, Amortized Cost	20,200
Fair Value
One to five years	403
Five to ten years	61,057
After ten years	176,885
Fair Value	238,345
Fair Value	468,997	473,275
Held-to-maturity securities, Five to ten years	13,956
Held-to-maturity securities, After ten years	5,554
Held-to-maturity securities, Fair Value	19,510
Mortgage-backed securities
Amortized Cost
Amortized cost	237,703	215,452
Fair Value
Fair Value	225,692	209,720
Asset-backed securities
Amortized Cost
Amortized cost	5,003	5,000
Fair Value
Fair Value	$ 4,960	5,009
Other securities
Amortized Cost
Amortized cost		3,000
Fair Value
Fair Value		$ 2,932

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