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Securities (Schedule of Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities Available-for-Sale: Amortized cost
Due in one year or less	$ 7,809
Due after one year through five years	16,987
Due after five years through ten years	68,720
Due after ten years	454,757
Amortized Cost	1,172,175	$ 834,850
Securities Available-for-Sale: Fair Value
Due in one year or less	7,802
Due after one year through five years	17,601
Due after five years through ten years	73,675
Due after ten years	482,169
Fair Value	1,217,852	854,825
MBS/CMO
Securities Available-for-Sale: Amortized cost
Securities without single maturity	535,526
Amortized Cost	535,526	526,907
Securities Available-for-Sale: Fair Value
Securities without single maturity	548,307
Fair Value	548,307	530,525
US Gov't Sponsored Entities & Agencies
Securities Available-for-Sale: Amortized cost
Securities without single maturity	88,376
Amortized Cost	88,376	0
Securities Available-for-Sale: Fair Value
Securities without single maturity	88,298
Fair Value	$ 88,298	$ 0

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