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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
investment securities held-to-maturity
Amortized cost	$ 2,636,673,000		$ 2,683,241,000
Gross Unrealized Losses	(409,061,000)		(433,073,000)
Fair Value	2,227,612,000		2,250,168,000
Investment securities available for sale
Amortized cost	5,976,501,000		6,216,141,000
Gross Unrealized Gains	206,000		4,054,000
Gross Unrealized Losses	(816,708,000)		(893,373,000)
Fair Value	5,159,999,000		5,326,822,000
Gross realized gains	1,300,000
Gross realized losses	1,300,000
Securities gains, net	45,000
Atlantic Capital
Investment securities available for sale
Realized gains or losses		$ 0
Sold securities		$ 414,400,000
U.S. Treasuries
Investment securities available for sale
Amortized cost	273,035,000		272,416,000
Gross Unrealized Losses	(4,939,000)		(6,778,000)
Fair Value	268,096,000		265,638,000
U.S. Government agencies
investment securities held-to-maturity
Amortized cost	197,264,000		197,262,000
Gross Unrealized Losses	(28,175,000)		(29,787,000)
Fair Value	169,089,000		167,475,000
Investment securities available for sale
Amortized cost	246,001,000		245,972,000
Gross Unrealized Losses	(25,742,000)		(26,884,000)
Fair Value	220,259,000		219,088,000
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	1,553,373,000		1,591,646,000
Gross Unrealized Losses	(238,470,000)		(255,093,000)
Fair Value	1,314,903,000		1,336,553,000
Investment securities available for sale
Amortized cost	1,951,725,000		1,996,405,000
Gross Unrealized Losses	(278,563,000)		(298,052,000)
Fair Value	1,673,162,000		1,698,353,000
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	468,794,000		474,660,000
Gross Unrealized Losses	(63,317,000)		(69,664,000)
Fair Value	405,477,000		404,996,000
Investment securities available for sale
Amortized cost	689,575,000		708,337,000
Gross Unrealized Losses	(98,163,000)		(107,292,000)
Fair Value	591,412,000		601,045,000
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Amortized cost	360,962,000		362,586,000
Gross Unrealized Losses	(68,141,000)		(66,304,000)
Fair Value	292,821,000		296,282,000
Investment securities available for sale
Amortized cost	1,180,323,000		1,196,700,000
Gross Unrealized Gains	8,000		2,542,000
Gross Unrealized Losses	(192,894,000)		(198,844,000)
Fair Value	987,437,000		1,000,398,000
State and municipal obligations
Investment securities available for sale
Amortized cost	1,138,809,000		1,269,525,000
Gross Unrealized Gains	4,000		1,210,000
Gross Unrealized Losses	(171,856,000)		(205,883,000)
Fair Value	966,957,000		1,064,852,000
Small Business Administration loan-backed securities
investment securities held-to-maturity
Amortized cost	56,280,000		57,087,000
Gross Unrealized Losses	(10,958,000)		(12,225,000)
Fair Value	45,322,000		44,862,000
Investment securities available for sale
Amortized cost	466,462,000		491,203,000
Gross Unrealized Gains	194,000		302,000
Gross Unrealized Losses	(41,164,000)		(46,695,000)
Fair Value	425,492,000		444,810,000
Corporate securities.
Investment securities available for sale
Amortized cost	30,571,000		35,583,000
Gross Unrealized Losses	(3,387,000)		(2,945,000)
Fair Value	$ 27,184,000		$ 32,638,000

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