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Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other comprehensive income/(loss) before taxes:      
Unrealized holding (losses)/gains on available-for-sale-securities, before tax $ 41,442 $ (18,958) $ (24,241)
Other comprehensive income/(loss) before tax 2,834 (52,047) (33,109)
Other Comprehensive Income (Loss), Tax [Abstract]      
Unrealized holding gains/(losses) on available-for-sale securities, provision (benefit) 8,703 (3,982) (5,090)
Other comprehensive income/(loss), provision (benefit) 596 (10,930) (6,953)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Unrealized holding gains/(losses) on available-for-sale securities, after tax 32,739 (14,976) (19,151)
Reclassification adjustments, after tax (8,895) (14,580) (9,576)
Unrealized gains/(losses) on cash flow hedges 11,133 (26,537) (16,580)
Other comprehensive income/(loss) net of tax 2,238 (41,117) (26,156)
Cash Flow Hedges      
Other comprehensive income/(loss) before taxes:      
Unrealized gain/(losses) on cash flow hedges, before taxes (27,350) (14,635) 3,254
Other comprehensive income/(loss) before tax (21,780) (15,801) 2,938
Other Comprehensive Income (Loss), Tax [Abstract]      
Unrealized gains/(losses) on cash flow hedges, provision (benefit) (5,744) (3,074) 683
Other comprehensive income/(loss), provision (benefit) (4,574) (3,319) 617
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax 4,400 (921) (250)
Unrealized gains/(losses) on cash flow hedges (21,606) (11,561) 2,571
Other comprehensive income/(loss) net of tax (17,206) (12,482) 2,321
Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest      
Other comprehensive income/(loss) before taxes:      
Other comprehensive income/(loss) before tax 37,291 (22,831) (29,980)
Other Comprehensive Income (Loss), Tax [Abstract]      
Other comprehensive income/(loss), provision (benefit) 7,831 (4,794) (6,296)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax (3,279) (3,061) (4,533)
Unrealized gains/(losses) on cash flow hedges 32,739 (14,976) (19,151)
Other comprehensive income/(loss) net of tax 29,460 (18,037) (23,684)
Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest      
Other comprehensive income/(loss) before taxes:      
Other comprehensive income/(loss) before tax (12,677) (13,415) (6,067)
Other Comprehensive Income (Loss), Tax [Abstract]      
Other comprehensive income/(loss), provision (benefit) (2,661) (2,817) (1,274)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax (10,016) (10,598) (4,793)
Unrealized gains/(losses) on cash flow hedges 0 0 0
Other comprehensive income/(loss) net of tax (10,016) (10,598) (4,793)
Net Interest Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments      
Other comprehensive income/(loss) before taxes:      
Reclassification adjustments, before tax (3,895) (3,834) (5,784)
Other Comprehensive Income (Loss), Tax [Abstract]      
Reclassification adjustments, provision (benefit) (818) (805) (1,215)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax (3,077) (3,029) (4,569)
Net Interest Income | Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments      
Other comprehensive income/(loss) before taxes:      
Reclassification adjustments, before tax (12,677) (13,415) (6,067)
Other Comprehensive Income (Loss), Tax [Abstract]      
Reclassification adjustments, provision (benefit) (2,661) (2,817) (1,274)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax (10,016) (10,598) (4,793)
Other income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments      
Other comprehensive income/(loss) before taxes:      
Reclassification adjustments, before tax (256) (275) 45
Other Comprehensive Income (Loss), Tax [Abstract]      
Reclassification adjustments, provision (benefit) (54) (57) 9
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax (202) (218) 36
Net interest income | Cash Flow Hedges | Reclassification adjustments      
Other comprehensive income/(loss) before taxes:      
Reclassification adjustments, before tax 5,570 (1,166) (316)
Other Comprehensive Income (Loss), Tax [Abstract]      
Reclassification adjustments, provision (benefit) 1,170 (245) (66)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax 4,400 (921) (250)
Gain (Loss) on Investments | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments      
Other comprehensive income/(loss) before taxes:      
Reclassification adjustments, before tax 0 (236) 0
Other Comprehensive Income (Loss), Tax [Abstract]      
Reclassification adjustments, provision (benefit) 0 (50) 0
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Reclassification adjustments, after tax $ 0 $ 186 $ 0