Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 2,633
Due after one year through five years	18,943
Due after five years through ten years	70,048
Due after ten years	208,824
Amortized Cost	828,810	$ 821,254
Securities Available-for-Sale: Fair Value
Due in one year or less	2,645
Due after one year through five years	19,340
Due after five years through ten years	73,503
Due after ten years	221,984
Fair Value	849,445	812,611
MBS/CMO - Residential
Securities Available-for-Sale: Amortized cost
Amortized cost, MBS/CMO - Residential	528,362
Amortized Cost	528,362	529,805
Securities Available-for-Sale: Fair Value
Fair value, MBS/CMO - Residential	531,973
Fair Value	$ 531,973	$ 518,078

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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