Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Before - Tax
Other comprehensive income (loss)	$ 83,250	$ 61,909	$ (18,015)
Tax Effect
Other comprehensive income (loss)	(20,517)	(22,143)	3,631
Net-of- Tax
Net unrealized gains (losses) arising during the period	71,477	42,534	(12,598)
Net realized gains reclassified into net income	(8,744)	(2,768)	(1,786)
Other comprehensive income (loss)	62,733	39,766	(14,384)
AFS Debt Securities
Before - Tax
Net unrealized gains (losses) arising during the period	89,868	65,549	(9,748)
Net realized gains reclassified into net income	(12,299)	(3,930)	(2,535)
Other comprehensive income (loss)	77,569	61,619	(12,283)
Tax Effect
Net unrealized gains (losses) arising during the period	(26,539)	(19,379)	2,882
Net realized gains reclassified into net income	3,636	1,162	749
Other comprehensive income (loss)	(22,903)	(18,217)	3,631
Net-of- Tax
Net unrealized gains (losses) arising during the period	63,329	46,170	(6,866)
Net realized gains reclassified into net income	(8,663)	(2,768)	(1,786)
Other comprehensive income (loss)	54,666	43,402	(8,652)
Cash Flow Hedges
Before - Tax
Net unrealized gains (losses) arising during the period	(1,604)	0	0
Net realized gains reclassified into net income	(113)	0	0
Other comprehensive income (loss)	(1,717)	0	0
Tax Effect
Net unrealized gains (losses) arising during the period	455	0	0
Net realized gains reclassified into net income	32	0	0
Other comprehensive income (loss)	487	0	0
Net-of- Tax
Net unrealized gains (losses) arising during the period	(1,149)	0	0
Net realized gains reclassified into net income	(81)	0	0
Other comprehensive income (loss)	(1,230)	0	0
Foreign Currency Translation Adjustments
Before - Tax
Net unrealized gains (losses) arising during the period	7,398	290	(5,732)
Other comprehensive income (loss)	7,398	290	(5,732)
Tax Effect
Net unrealized gains (losses) arising during the period	1,899	(3,926)	0
Other comprehensive income (loss)	1,899	(3,926)	0
Net-of- Tax
Net unrealized gains (losses) arising during the period	9,297	(3,636)	(5,732)
Net realized gains reclassified into net income	0	0	0
Other comprehensive income (loss)	$ 9,297	$ (3,636)	$ (5,732)