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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value
Amortized Cost	$ 2,238,996	$ 2,590,099
Fair Value	1,907,458	2,189,379
Unrealized gains	39	30
Unrealized (losses)	(331,577)	(400,750)
Securities held to maturity:
Amortized Cost	521,801	533,678
Fair Value	448,300	449,623
Unrealized gains	29	39
Unrealized (losses)	(73,530)	(84,094)
U.S. Treasuries
Fair Value
Amortized Cost	0	174,785
Fair Value	0	172,570
Unrealized gains	0	0
Unrealized (losses)	0	(2,215)
Government-sponsored enterprise securities
Fair Value
Amortized Cost	71,968	71,964
Fair Value	62,872	60,266
Unrealized gains	0	0
Unrealized (losses)	(9,096)	(11,698)
Mortgage-backed securities
Fair Value
Amortized Cost	2,150,849	2,323,674
Fair Value	1,828,802	1,937,784
Unrealized gains	39	30
Unrealized (losses)	(322,086)	(385,920)
Securities held to maturity:
Amortized Cost	9,923	12,085
Fair Value	9,564	11,447
Unrealized gains	0	0
Unrealized (losses)	(359)	(638)
Corporate bonds
Fair Value
Amortized Cost	16,179	19,676
Fair Value	15,784	18,759
Unrealized gains	0	0
Unrealized (losses)	(395)	(917)
State and local governments
Securities held to maturity:
Amortized Cost	511,878	521,593
Fair Value	438,736	438,176
Unrealized gains	29	39
Unrealized (losses)	$ (73,171)	$ (83,456)

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