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Securities - Amortized cost and fair value for held to maturity and available for sale securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investment securities held-to-maturity
Amortized cost	$ 2,007,249	$ 2,048,030
Gross Unrealized Losses	(323,111)	(315,180)
Fair Value	1,684,138	1,732,850
Investment securities available for sale
Amortized cost	6,969,183	6,696,576
Gross Unrealized Gains	17,074	39,169
Gross Unrealized Losses	(455,909)	(421,989)
Fair Value	6,530,348	6,313,756
U.S. Government agencies
Investment securities held-to-maturity
Amortized cost	132,914	132,913
Gross Unrealized Losses	(16,892)	(15,767)
Fair Value	116,022	117,146
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Investment securities held-to-maturity
Amortized cost	1,123,852	1,153,024
Gross Unrealized Losses	(181,274)	(177,101)
Fair Value	942,578	975,923
Investment securities available for sale
Amortized cost	1,991,530	1,826,307
Gross Unrealized Gains	5,089	10,108
Gross Unrealized Losses	(147,521)	(138,307)
Fair Value	1,849,098	1,698,108
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
Investment securities held-to-maturity
Amortized cost	372,106	379,107
Gross Unrealized Losses	(58,553)	(55,232)
Fair Value	313,553	323,875
Investment securities available for sale
Amortized cost	2,148,049	2,208,710
Gross Unrealized Gains	9,383	23,979
Gross Unrealized Losses	(52,877)	(47,105)
Fair Value	2,104,555	2,185,584
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Investment securities held-to-maturity
Amortized cost	332,619	336,910
Gross Unrealized Losses	(58,228)	(58,332)
Fair Value	274,391	278,578
Investment securities available for sale
Amortized cost	1,047,410	903,209
Gross Unrealized Gains	1,545	3,282
Gross Unrealized Losses	(78,644)	(74,042)
Fair Value	970,311	832,449
State and municipal obligations
Investment securities available for sale
Amortized cost	1,191,625	1,141,377
Gross Unrealized Gains	593	1,252
Gross Unrealized Losses	(151,023)	(135,217)
Fair Value	1,041,195	1,007,412
Small Business Administration loan-backed securities
Investment securities held-to-maturity
Amortized cost	45,758	46,076
Gross Unrealized Losses	(8,164)	(8,748)
Fair Value	37,594	37,328
Investment securities available for sale
Amortized cost	567,569	593,973
Gross Unrealized Gains	464	548
Gross Unrealized Losses	(24,548)	(26,088)
Fair Value	543,485	568,433
Corporate securities
Investment securities available for sale
Amortized cost	23,000	23,000
Gross Unrealized Losses	(1,296)	(1,230)
Fair Value	$ 21,704	$ 21,770

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