Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 3,722,020	$ 2,668,697
Gross Unrealized Gains	284	25,980
Gross Unrealized Losses	(535,652)	(34,072)
Fair Value	3,186,652	2,660,605
U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	67,075	67,558
Gross Unrealized Gains	0	4,103
Gross Unrealized Losses	(1,045)	0
Fair Value	66,030	71,661
U.S. government agency securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	259,869	6,265
Gross Unrealized Gains	0	113
Gross Unrealized Losses	(45,555)	0
Fair Value	214,314	6,378
Obligations of states and state agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	88,276	141,015
Gross Unrealized Gains	16	3,065
Gross Unrealized Losses	(5,127)	(312)
Fair Value	83,165	143,768
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	382,913	196,947
Gross Unrealized Gains	17	3,536
Gross Unrealized Losses	(35,961)	(87)
Fair Value	346,969	200,396
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	471,189	337,962
Gross Unrealized Gains	33	6,601
Gross Unrealized Losses	(41,088)	(399)
Fair Value	430,134	344,164
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,811,582	2,166,142
Gross Unrealized Gains	250	14,599
Gross Unrealized Losses	(438,251)	(28,440)
Fair Value	2,373,581	2,152,301
Trust preferred securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	37,038	37,020
Gross Unrealized Gains	1	5
Gross Unrealized Losses	(5,622)	(5,109)
Fair Value	31,417	31,916
Corporate and other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	75,267	53,750
Gross Unrealized Gains	0	559
Gross Unrealized Losses	(4,091)	(124)
Fair Value	$ 71,176	$ 54,185

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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