Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,180,215	$ 1,077,492	$ 992,477	$ 824,116	$ 693,617	$ 799,276	$ 992,477	$ 799,276
Other comprehensive income before reclassifications	2,324			39,003			34,775	(29,894)
Amounts reclassified from AOCI	(851)			(1,343)			(2,646)	(7,782)
Other comprehensive income/(loss) net of tax	1,473	(35,011)	65,667	37,660	29,940	(105,276)	32,129	(37,676)
Ending balance	1,197,298	1,180,215	1,077,492	930,345	824,116	693,617	1,197,298	930,345
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest | Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	8,954		(13,937)	(88,261)		(43,397)	(13,937)	(43,397)
Other comprehensive income before reclassifications	1,275			38,099			25,734	(5,210)
Amounts reclassified from AOCI	(493)			(783)			(2,061)	(2,338)
Other comprehensive income/(loss) net of tax	782			37,316			23,673	(7,548)
Ending balance	9,736	8,954		(50,945)	(88,261)		9,736	(50,945)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest | Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19,819		22,829	26,379		32,845	22,829	32,845
Other comprehensive income before reclassifications	0			0			0	0
Amounts reclassified from AOCI	(1,884)			(1,993)			(4,894)	(8,459)
Other comprehensive income/(loss) net of tax	(1,884)			(1,993)			(4,894)	(8,459)
Ending balance	17,935	19,819		24,386	26,379		17,935	24,386
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(12,040)		(22,815)	(29,615)		(5,609)	(22,815)	(5,609)
Other comprehensive income before reclassifications	1,049			904			9,041	(24,684)
Amounts reclassified from AOCI	1,526			1,433			4,309	3,015
Other comprehensive income/(loss) net of tax	2,575			2,337			13,350	(21,669)
Ending balance	(9,465)	(12,040)		(27,278)	(29,615)		(9,465)	(27,278)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	16,733	51,744	(13,923)	(91,497)	(121,437)	(16,161)	(13,923)	(16,161)
Other comprehensive income/(loss) net of tax	1,473	(35,011)	65,667	37,660	29,940	(105,276)
Ending balance	$ 18,206	$ 16,733	$ 51,744	$ (53,837)	$ (91,497)	$ (121,437)	$ 18,206	$ (53,837)