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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value
Amortized Cost	$ 2,277,299	$ 2,590,099
Fair Value	1,867,211	2,189,379
Unrealized gains	12	30
Unrealized (losses)	(410,100)	(400,750)
Securities held to maturity:
Amortized Cost	523,600	533,678
Fair Value	431,442	449,623
Unrealized gains	0	39
Unrealized (losses)	(92,158)	(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	71,967	71,964
Fair Value	60,127	60,266
Unrealized gains	0	0
Unrealized (losses)	(11,840)	(11,698)
Mortgage-backed securities
Fair Value
Amortized Cost	2,186,655	2,323,674
Fair Value	1,789,243	1,937,784
Unrealized gains	12	30
Unrealized (losses)	(397,424)	(385,920)
Securities held to maturity:
Amortized Cost	10,645	12,085
Fair Value	10,008	11,447
Unrealized gains	0	0
Unrealized (losses)	(637)	(638)
Corporate bonds
Fair Value
Amortized Cost	18,677	19,676
Fair Value	17,841	18,759
Unrealized gains	0	0
Unrealized (losses)	(836)	(917)
State and local governments
Securities held to maturity:
Amortized Cost	512,955	521,593
Fair Value	421,434	438,176
Unrealized gains	0	39
Unrealized (losses)	$ (91,521)	$ (83,456)

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