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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
investment securities held-to-maturity
Amortized cost	$ 1,819,901	$ 955,542
Gross Unrealized Gains	318	2,764
Gross Unrealized Losses	(42,155)	(1,123)
Fair Value	1,778,064	957,183
Investment securities available for sale
Amortized cost	5,221,296	3,268,037
Gross Unrealized Gains	35,980	66,800
Gross Unrealized Losses	(63,798)	(4,165)
Fair Value	5,193,478	3,330,672
U.S. Government agencies
investment securities held-to-maturity
Amortized cost	112,913	25,000
Gross Unrealized Gains		1
Gross Unrealized Losses	(2,627)
Fair Value	110,286	25,001
Investment securities available for sale
Amortized cost	98,882	29,882
Gross Unrealized Gains		16
Gross Unrealized Losses	(1,765)	(642)
Fair Value	97,117	29,256
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	1,120,104	632,269
Gross Unrealized Gains	14	1,827
Gross Unrealized Losses	(24,278)	(1,032)
Fair Value	1,095,840	633,064
Investment securities available for sale
Amortized cost	1,851,700	1,351,506
Gross Unrealized Gains	5,324	16,657
Gross Unrealized Losses	(25,985)	(1,031)
Fair Value	1,831,039	1,367,132
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	174,178	75,767
Gross Unrealized Gains		405
Gross Unrealized Losses	(4,937)
Fair Value	169,241	76,172
Investment securities available for sale
Amortized cost	730,949	739,797
Gross Unrealized Gains	5,957	16,579
Gross Unrealized Losses	(10,911)	(825)
Fair Value	725,995	755,551
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	350,116	174,506
Gross Unrealized Gains	304	300
Gross Unrealized Losses	(8,021)	(91)
Fair Value	342,399	174,715
Investment securities available for sale
Amortized cost	1,220,233	229,219
Gross Unrealized Gains	5,438	10,939
Gross Unrealized Losses	(18,430)	(50)
Fair Value	1,207,241	240,108
State and municipal obligations
Investment securities available for sale
Amortized cost	798,211	502,575
Gross Unrealized Gains	16,697	17,491
Gross Unrealized Losses	(2,219)	(27)
Fair Value	812,689	520,039
Small Business Administration loan-backed securities
investment securities held-to-maturity
Amortized cost	62,590	48,000
Gross Unrealized Gains		231
Gross Unrealized Losses	(2,292)
Fair Value	60,298	48,231
Investment securities available for sale
Amortized cost	502,812	401,496
Gross Unrealized Gains	2,330	4,978
Gross Unrealized Losses	(4,479)	(1,590)
Fair Value	500,663	404,884
Corporate securities.
Investment securities available for sale
Amortized cost	18,509	13,562
Gross Unrealized Gains	234	140
Gross Unrealized Losses	(9)
Fair Value	$ 18,734	$ 13,702

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