Investment Securities - Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value
Less than Twelve Months	$ 1,610,100	$ 1,440,435
More than Twelve Months	1,492,658	242,949
Total	3,102,758	1,683,384
Unrealized Losses
Less than Twelve Months	(183,528)	(22,830)
More than Twelve Months	(318,091)	(11,242)
Total	(501,619)	(34,072)
U.S. Treasury securities
Fair Value
Less than Twelve Months	65,889
More than Twelve Months	0
Total	65,889
Unrealized Losses
Less than Twelve Months	(1,022)
More than Twelve Months	0
Total	(1,022)	0
U.S. government agency securities
Fair Value
Less than Twelve Months	209,863
More than Twelve Months	1,673
Total	211,536
Unrealized Losses
Less than Twelve Months	(47,508)
More than Twelve Months	(172)
Total	(47,680)	0
Obligations of states and state agencies
Fair Value
Less than Twelve Months	62,443	17,000
More than Twelve Months	18,231	5,517
Total	80,674	22,517
Unrealized Losses
Less than Twelve Months	(2,020)	(254)
More than Twelve Months	(1,849)	(58)
Total	(3,869)	(312)
Municipal bonds
Fair Value
Less than Twelve Months	251,970	9,403
More than Twelve Months	15,534	0
Total	267,504	9,403
Unrealized Losses
Less than Twelve Months	(20,457)	(87)
More than Twelve Months	(3,158)	0
Total	(23,615)	(87)
Total obligations of states and political subdivisions
Fair Value
Less than Twelve Months	314,413	26,403
More than Twelve Months	33,765	5,517
Total	348,178	31,920
Unrealized Losses
Less than Twelve Months	(22,477)	(341)
More than Twelve Months	(5,007)	(58)
Total	(27,484)	(399)
Residential mortgage-backed securities
Fair Value
Less than Twelve Months	962,690	1,381,405
More than Twelve Months	1,413,590	206,520
Total	2,376,280	1,587,925
Unrealized Losses
Less than Twelve Months	(109,532)	(22,365)
More than Twelve Months	(305,500)	(6,075)
Total	(415,032)	(28,440)
Trust preferred securities
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	30,105	30,912
Total	30,105	30,912
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(5,938)	(5,109)
Total	(5,938)	(5,109)
Corporate and other debt securities
Fair Value
Less than Twelve Months	57,245	32,627
More than Twelve Months	13,525	0
Total	70,770	32,627
Unrealized Losses
Less than Twelve Months	(2,989)	(124)
More than Twelve Months	(1,474)	0
Total	$ (4,463)	$ (124)

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

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