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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
investment securities held-to-maturity
Amortized cost	$ 2,683,241	$ 1,819,901
Gross Unrealized Gains		318
Gross Unrealized Losses	(433,073)	(42,155)
Fair Value	2,250,168	1,778,064
Investment securities available for sale
Amortized cost	6,216,141	5,221,296
Gross Unrealized Gains	4,054	35,980
Gross Unrealized Losses	(893,373)	(63,798)
Fair Value	5,326,822	5,193,478
Gross realized gains	103	750	$ 662
Gross realized losses	(73)	(648)	(612)
Securities gains, net	30	102	$ 50
U.S. Treasuries
Investment securities available for sale
Amortized cost	272,416
Gross Unrealized Losses	(6,778)
Fair Value	265,638
U.S. Government agencies
investment securities held-to-maturity
Amortized cost	197,262	112,913
Gross Unrealized Losses	(29,787)	(2,627)
Fair Value	167,475	110,286
Investment securities available for sale
Amortized cost	245,972	98,882
Gross Unrealized Losses	(26,884)	(1,765)
Fair Value	219,088	97,117
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	1,591,646	1,120,104
Gross Unrealized Gains		14
Gross Unrealized Losses	(255,093)	(24,278)
Fair Value	1,336,553	1,095,840
Investment securities available for sale
Amortized cost	1,996,405	1,851,700
Gross Unrealized Gains		5,324
Gross Unrealized Losses	(298,052)	(25,985)
Fair Value	1,698,353	1,831,039
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	474,660	174,178
Gross Unrealized Losses	(69,664)	(4,937)
Fair Value	404,996	169,241
Investment securities available for sale
Amortized cost	708,337	730,949
Gross Unrealized Gains		5,957
Gross Unrealized Losses	(107,292)	(10,911)
Fair Value	601,045	725,995
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	362,586	350,116
Gross Unrealized Gains		304
Gross Unrealized Losses	(66,304)	(8,021)
Fair Value	296,282	342,399
Investment securities available for sale
Amortized cost	1,196,700	1,220,233
Gross Unrealized Gains	2,542	5,438
Gross Unrealized Losses	(198,844)	(18,430)
Fair Value	1,000,398	1,207,241
State and municipal obligations
Investment securities available for sale
Amortized cost	1,269,525	798,211
Gross Unrealized Gains	1,210	16,697
Gross Unrealized Losses	(205,883)	(2,219)
Fair Value	1,064,852	812,689
Small Business Administration loan-backed securities
investment securities held-to-maturity
Amortized cost	57,087	62,590
Gross Unrealized Losses	(12,225)	(2,292)
Fair Value	44,862	60,298
Investment securities available for sale
Amortized cost	491,203	502,812
Gross Unrealized Gains	302	2,330
Gross Unrealized Losses	(46,695)	(4,479)
Fair Value	444,810	500,663
Corporate securities.
Investment securities available for sale
Amortized cost	35,583	18,509
Gross Unrealized Gains		234
Gross Unrealized Losses	(2,945)	(9)
Fair Value	$ 32,638	$ 18,734

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