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Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 799,276 $ 752,557 $ 708,644
Other comprehensive (loss)/income before reclassifications 11,133 (26,537) (16,580)
Amounts reclassified from AOCI (8,895) (14,580) (9,576)
Other comprehensive income/(loss) net of tax 2,238 (41,117) (26,156)
Ending balance 992,477 799,276 752,557
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (43,397) (25,360) (1,676)
Other comprehensive (loss)/income before reclassifications 32,739 (14,976) (19,151)
Amounts reclassified from AOCI (3,279) (3,061) (4,533)
Other comprehensive income/(loss) net of tax 29,460 (18,037) (23,684)
Ending balance (13,937) (43,397) (25,360)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Held-to-Maturity Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 32,845 43,443 48,236
Other comprehensive (loss)/income before reclassifications 0 0 0
Amounts reclassified from AOCI (10,016) (10,598) (4,793)
Other comprehensive income/(loss) net of tax (10,016) (10,598) (4,793)
Ending balance 22,829 32,845 43,443
Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (5,609) 6,873 4,552
Other comprehensive (loss)/income before reclassifications (21,606) (11,561) 2,571
Amounts reclassified from AOCI 4,400 (921) (250)
Other comprehensive income/(loss) net of tax (17,206) (12,482) 2,321
Ending balance (22,815) (5,609) 6,873
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (16,161) 24,956 51,112
Other comprehensive income/(loss) net of tax 2,238 (41,117) (26,156)
Ending balance $ (13,923) $ (16,161) $ 24,956