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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value
Amortized Cost	$ 2,856,109	$ 2,662,481
Fair Value	2,532,624	2,630,414
Unrealized Gains	122	10,595
Unrealized (Losses)	(323,607)	(42,662)
Securities held to maturity:
Amortized Cost	546,410	513,825
Fair Value	452,658	511,699
Unrealized Gains	10	3,540
Unrealized (Losses)	(93,762)	(5,666)
U.S. Treasuries
Fair Value
Amortized Cost	174,236	0
Fair Value	172,195	0
Unrealized Gains	0	0
Unrealized (Losses)	(2,041)	0
Government-sponsored enterprise securities
Fair Value
Amortized Cost	71,954	71,951
Fair Value	60,917	69,179
Unrealized Gains	0	0
Unrealized (Losses)	(11,037)	(2,772)
Mortgage-backed securities
Fair Value
Amortized Cost	2,564,559	2,545,150
Fair Value	2,254,549	2,514,805
Unrealized Gains	19	9,489
Unrealized (Losses)	(310,029)	(39,834)
Securities held to maturity:
Amortized Cost	17,190	20,260
Fair Value	16,754	20,845
Unrealized Gains	0	585
Unrealized (Losses)	(436)	0
Corporate bonds
Fair Value
Amortized Cost	45,360	45,380
Fair Value	44,963	46,430
Unrealized Gains	103	1,106
Unrealized (Losses)	(500)	(56)
State and local governments
Securities held to maturity:
Amortized Cost	529,220	493,565
Fair Value	435,904	490,854
Unrealized Gains	10	2,955
Unrealized (Losses)	$ (93,326)	$ (5,666)

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