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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value
Amortized Cost	$ 2,300,863	$ 1,432,684
Fair Value	2,305,075	1,453,132
Unrealized Gains	20,030	22,963
Unrealized (Losses)	(15,818)	(2,515)
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	367,893	167,551
Fair Value	369,953	170,734
Unrealized Gains	3,632	3,348
Unrealized (Losses)	(1,572)	(165)
Government-sponsored enterprise securities
Fair Value
Amortized Cost	70,014	70,016
Fair Value	68,608	70,206
Unrealized Gains	0	371
Unrealized (Losses)	(1,406)	(181)
Mortgage-backed securities
Fair Value
Amortized Cost	2,187,209	1,318,998
Fair Value	2,191,530	1,337,706
Unrealized Gains	18,604	20,832
Unrealized (Losses)	(14,283)	(2,124)
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	22,028	29,959
Fair Value	22,886	30,900
Unrealized Gains	858	941
Unrealized (Losses)	0	0
Corporate bonds
Fair Value
Amortized Cost	43,640	43,670
Fair Value	44,937	45,220
Unrealized Gains	1,426	1,760
Unrealized (Losses)	(129)	(210)
State and local governments
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	345,865	137,592
Fair Value	347,067	139,834
Unrealized Gains	2,774	2,407
Unrealized (Losses)	$ (1,572)	$ (165)

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