Other Comprehensive (Loss) Income - Reclassification adjustments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Securities available for sale and transferred securities: Before Tax Amount
Change in net unrealized gain/loss during the period	$ (53,212)		$ 11,985		$ (127,405)	$ (7,127)
Reclassification adjustment for net gains included in net income			(1,469)			(1,985)
Total other comprehensive gain (loss)	(64,881)		14,500		(156,108)	(5,128)
Cash flow hedge derivatives
Change in net unrealized gain/loss during the period, Before tax	(13,710)		4,434		(29,951)	4,434
Reclassification adjustment for net gains included in net income, Before tax	2,041		(450)		1,248	(450)
Change in net unrealized gain/loss during the period, Tax (expense) benefit	2,879		(932)		6,290	(932)
Reclassification adjustment for net gains included in net income, Tax (expense) benefit	(429)		95		(262)	95
Total other comprehensive gain (loss)	13,624		(3,045)		32,782	1,077
Change in net unrealized gain/loss during the period, Net of tax	(10,831)		3,502		(23,661)	3,502
Reclassification adjustment for net gains included in net income, Net of tax	1,612		(355)		986	(355)
Total other comprehensive income (loss)	(51,257)	$ (72,069)	11,455	$ (15,506)	(123,326)	(4,051)
Securities available for sale and transferred securities: Tax (Expense) Benefit
Change in net unrealized gain/loss during the period	11,174		(2,517)		26,754	1,497
Reclassification adjustment for net gains included in net income			309			417
Total other comprehensive gain (loss)	13,624		(3,045)		32,782	1,077
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period	(42,038)		9,468		(100,651)	(5,630)
Reclassification adjustment for net gains included in net income			(1,160)			(1,568)
Total other comprehensive income (loss)	$ (51,257)	$ (72,069)	$ 11,455	$ (15,506)	$ (123,326)	$ (4,051)