Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (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
Other comprehensive income/(loss) before taxes:
Other comprehensive income/(loss), Before Tax	$ 1,864			$ 47,671			$ 40,670	$ (47,690)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income/(loss), Provision (Benefit)	391			10,011			8,541	(10,014)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	2,324			39,003			34,775	(29,894)
Less reclassification adjustments, Provision (Benefit)	(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)
Securities | Available-for-Sale Securities
Other comprehensive income/(loss) before taxes:
Unrealized gain/(losses), Before Tax	1,614			48,226			32,574	(6,596)
Other comprehensive income/(loss), Before Tax	991			47,235			29,966	(9,554)
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains/(losses), Provision (Benefit)	339			10,127			6,840	(1,386)
Other comprehensive income/(loss), Provision (Benefit)	209			9,919			6,293	(2,006)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	1,275			38,099			25,734	(5,210)
Other comprehensive income/(loss) net of tax	782			37,316			23,673	(7,548)
Securities | Held-to-Maturity Securities
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(2,385)			(2,523)			(6,195)	(10,707)
Other comprehensive income/(loss), Before Tax	(2,385)			(2,523)			(6,195)	(10,707)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(501)			(530)			(1,301)	(2,248)
Other comprehensive income/(loss), Provision (Benefit)	(501)			(530)			(1,301)	(2,248)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(1,884)			(1,993)			(4,894)	(8,459)
Other comprehensive income/(loss) net of tax	(1,884)			(1,993)			(4,894)	(8,459)
Securities | Net interest income | Available-for-Sale Securities
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(362)			(976)			(2,333)	(2,916)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(76)			(205)			(490)	(612)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(286)			(771)			(1,843)	(2,304)
Securities | Other income | Available-for-Sale Securities
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(8)			(15)			(22)	(42)
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(1)			(3)			(4)	(8)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(7)			(12)			(18)	(34)
Cash flow hedges
Other comprehensive income/(loss) before taxes:
Unrealized gain/(losses), Before Tax	1,326			1,145			11,445	(31,246)
Less reclassification adjustments, Before Tax	1,932			1,814			5,454	3,817
Other comprehensive income/(loss), Before Tax	3,258			2,959			16,899	(27,429)
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains/(losses), Provision (Benefit)	277			241			2,404	(6,562)
Less reclassification adjustments, Provision (Benefit)	406			381			1,145	802
Other comprehensive income/(loss), Provision (Benefit)	683			622			3,549	(5,760)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	1,049			904			9,041	(24,684)
Less reclassification adjustments, Provision (Benefit)	1,526			1,433			4,309	3,015
Other comprehensive income/(loss) net of tax	2,575			2,337			13,350	(21,669)
AOCI Attributable to Parent
Other comprehensive income/(loss) before taxes:
Other comprehensive income/(loss), Before Tax	1,864			47,671			40,670	(47,690)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income/(loss), Provision (Benefit)	391			10,011			8,541	(10,014)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income/(loss) net of tax	1,473			37,660			32,129	(37,676)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest | Available-for-Sale Securities
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	1,275			38,099			25,734	(5,210)
Less reclassification adjustments, Provision (Benefit)	(493)			(783)			(2,061)	(2,338)
Other comprehensive income/(loss) net of tax	782			37,316			23,673	(7,548)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest | Held-to-Maturity Securities
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gains/(losses), After Tax	0			0			0	0
Less reclassification adjustments, Provision (Benefit)	(1,884)			(1,993)			(4,894)	(8,459)
Other comprehensive income/(loss) net of tax	(1,884)			(1,993)			(4,894)	(8,459)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest | Gain on sale of available-for sale investment securities | Available-for-Sale Securities | Reclassification adjustments
Other comprehensive income/(loss) before taxes:
Less reclassification adjustments, Before Tax	(253)			0			(253)	0
Other Comprehensive Income (Loss), Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	(53)			0			(53)	0
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Less reclassification adjustments, Provision (Benefit)	$ (200)			$ 0			$ (200)	$ 0