Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Other comprehensive income/(loss) before taxes:
Other comprehensive income/(loss), Before Tax	$ (44,316)		$ 37,899		$ 38,806	$ (95,361)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income/(loss), Provision (Benefit)	(9,305)		7,959		8,150	(20,025)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	(34,321)		31,454		32,452	(68,898)
Less reclassification adjustments, Provision (Benefit)	(690)		(1,514)		(1,796)	(6,438)
Other comprehensive (loss)/income net of tax	(35,011)	$ 65,667	29,940	$ (105,276)	30,656	(75,336)
Securities | Available-for-Sale Securities
Other comprehensive income/(loss) before taxes:
Unrealized gain/(losses), Before Tax	(36,395)		43,512		30,961	(54,822)
Other comprehensive income/(loss), Before Tax	(37,389)		42,527		28,975	(56,789)
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains/(losses), Provision (Benefit)	(7,644)		9,138		6,502	(11,512)
Other comprehensive income/(loss), Provision (Benefit)	(7,852)		8,930		6,084	(11,925)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	(28,751)		34,374		24,459	(43,310)
Other comprehensive (loss)/income net of tax	(29,537)		33,597		22,891	(44,864)
Securities | Held-to-Maturity Securities
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(1,653)		(2,496)		(3,810)	(8,184)
Other comprehensive income/(loss), Before Tax	(1,653)		(2,496)		(3,810)	(8,184)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(347)		(524)		800	1,718
Other comprehensive income/(loss), Provision (Benefit)	(347)		(524)		(800)	(1,718)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(1,306)		(1,972)		(3,010)	(6,466)
Other comprehensive (loss)/income net of tax	(1,306)		(1,972)		(3,010)	(6,466)
Securities | Net interest income | Available-for-Sale Securities
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(987)		(971)		(1,971)	(1,940)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(207)		(204)		415	407
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(780)		(767)		(1,556)	(1,533)
Securities | Other income | Available-for-Sale Securities
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(7)		(14)		(15)	(27)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(1)		(4)		3	6
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(6)		(10)		(12)	(21)
Cash flow hedges
Other comprehensive income/(loss) before taxes:
Unrealized gain/(losses), Before Tax	(7,050)		(3,695)		10,118	(32,390)
Less reclassification adjustments, Before Tax	1,776		1,563		3,523	2,002
Other comprehensive income/(loss), Before Tax	(5,274)		(2,132)		13,641	(30,388)
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains/(losses), Provision (Benefit)	(1,480)		(775)		2,125	(6,802)
Less reclassification adjustments, Provision (Benefit)	374		328		(741)	(420)
Other comprehensive income/(loss), Provision (Benefit)	(1,106)		(447)		2,866	(6,382)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	(5,570)		(2,920)		7,993	(25,588)
Less reclassification adjustments, Provision (Benefit)	1,402		1,235		2,782	1,582
Other comprehensive (loss)/income net of tax	(4,168)		(1,685)		10,775	(24,006)
AOCI Attributable to Parent
Other comprehensive income/(loss) before taxes:
Other comprehensive income/(loss), Before Tax	(44,316)		37,899		38,806	(95,361)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income/(loss), Provision (Benefit)	(9,305)		7,959		8,150	(20,025)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive (loss)/income net of tax	$ (35,011)		$ 29,940		$ 30,656	$ (75,336)