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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment securities held-to-maturity
Amortized cost	$ 2,254,670	$ 2,487,440
Gross Unrealized Losses	(420,143)	(402,704)
Fair Value	1,834,527	2,084,736
Investment securities available for sale
Amortized cost	5,129,216	5,561,006
Gross Unrealized Gains	701	1,898
Gross Unrealized Losses	(809,324)	(778,516)
Fair Value	4,320,593	4,784,388
U.S. Treasuries
Investment securities available for sale
Amortized cost	10,654	74,720
Gross Unrealized Gains	2
Gross Unrealized Losses		(830)
Fair Value	10,656	73,890
U.S. Government agencies
Investment securities held-to-maturity
Amortized cost	147,272	197,267
Gross Unrealized Losses	(23,498)	(24,607)
Fair Value	123,774	172,660
Investment securities available for sale
Amortized cost	169,207	246,089
Gross Unrealized Losses	(18,789)	(21,383)
Fair Value	150,418	224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Investment securities held-to-maturity
Amortized cost	1,297,543	1,438,102
Gross Unrealized Losses	(241,204)	(227,312)
Fair Value	1,056,339	1,210,790
Investment securities available for sale
Amortized cost	1,659,851	1,822,104
Gross Unrealized Gains	97	294
Gross Unrealized Losses	(282,423)	(264,092)
Fair Value	1,377,525	1,558,306
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
Investment securities held-to-maturity
Amortized cost	411,721	444,883
Gross Unrealized Losses	(72,057)	(68,139)
Fair Value	339,664	376,744
Investment securities available for sale
Amortized cost	557,288	626,735
Gross Unrealized Gains	19
Gross Unrealized Losses	(98,212)	(99,313)
Fair Value	459,095	527,422
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Investment securities held-to-maturity
Amortized cost	348,338	354,055
Gross Unrealized Losses	(72,391)	(71,327)
Fair Value	275,947	282,728
Investment securities available for sale
Amortized cost	1,234,573	1,217,125
Gross Unrealized Gains	562	1,516
Gross Unrealized Losses	(194,580)	(194,471)
Fair Value	1,040,555	1,024,170
State and municipal obligations
Investment securities available for sale
Amortized cost	1,117,330	1,129,750
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(171,609)	(152,291)
Fair Value	945,723	977,461
Small Business Administration loan-backed securities
Investment securities held-to-maturity
Amortized cost	49,796	53,133
Gross Unrealized Losses	(10,993)	(11,319)
Fair Value	38,803	41,814
Investment securities available for sale
Amortized cost	351,814	413,950
Gross Unrealized Gains	19	86
Gross Unrealized Losses	(41,721)	(42,350)
Fair Value	310,112	371,686
Corporate securities
Investment securities available for sale
Amortized cost	28,499	30,533
Gross Unrealized Losses	(1,990)	(3,786)
Fair Value	$ 26,509	$ 26,747

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