Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Other comprehensive (loss)/incomes:
Other comprehensive (loss)/income before tax	$ (55,086)	$ 83,123
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income/(loss), Provision (Benefit)	(11,568)	17,456
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	(45,086)	66,773
Less reclassification adjustments, Provision (Benefit)	1,568	(1,106)
Other comprehensive (loss)/income net of tax	(43,518)	65,667
Securities | Available-for-Sale Securities
Other comprehensive (loss)/incomes:
Unrealized gain/(losses), Before Tax	(86,263)	67,356
Other comprehensive (loss)/income before tax	(86,267)	66,364
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains/(losses), Provision (Benefit)	(18,115)	14,145
Other comprehensive income/(loss), Provision (Benefit)	(18,116)	13,936
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	(68,148)	53,211
Other comprehensive (loss)/income net of tax	(68,151)	52,428
Securities | Held-to-Maturity Securities
Other comprehensive (loss)/incomes:
Less reclassification adjustments, Before Tax	(23)	(2,157)
Other comprehensive (loss)/income before tax	(23)	(2,157)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(4)	(453)
Other comprehensive income/(loss), Provision (Benefit)	(4)	(453)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(19)	(1,704)
Other comprehensive (loss)/income net of tax	(19)	(1,704)
Securities | Net interest income | Available-for-Sale Securities
Other comprehensive (loss)/incomes:
Less reclassification adjustments, Before Tax	0	(984)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	0	(207)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	0	(777)
Securities | Other income | Available-for-Sale Securities
Other comprehensive (loss)/incomes:
Less reclassification adjustments, Before Tax	(4)	(8)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(1)	(2)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(3)	(6)
Cash flow hedges
Other comprehensive (loss)/incomes:
Unrealized gain/(losses), Before Tax	29,193	17,170
Less reclassification adjustments, Before Tax	2,011	1,746
Other comprehensive (loss)/income before tax	31,204	18,916
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains/(losses), Provision (Benefit)	6,131	3,608
Less reclassification adjustments, Provision (Benefit)	421	365
Other comprehensive income/(loss), Provision (Benefit)	6,552	3,973
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	23,062	13,562
Less reclassification adjustments, Provision (Benefit)	1,590	1,381
Other comprehensive (loss)/income net of tax	24,652	14,943
AOCI Attributable to Parent
Other comprehensive (loss)/incomes:
Other comprehensive (loss)/income before tax	(55,086)	83,123
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income/(loss), Provision (Benefit)	(11,568)	17,456
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive (loss)/income net of tax	$ (43,518)	$ 65,667