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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Balance $ 579,672 $ 549,464
Total other comprehensive (loss) income, net of tax (22,633) 2,210
Balance 549,683 559,559
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Balance (3,982) (15,649)
Other comprehensive income before reclassifications, net of tax (10,202) 5,620
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 25 0
Total other comprehensive (loss) income, net of tax (10,177) 5,620
Balance (14,159) (10,029)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Balance (5,863) 3,704
Other comprehensive income before reclassifications, net of tax (13,748) (3,644)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 143 139
Total other comprehensive (loss) income, net of tax (13,605) (3,505)
Balance (19,468) 199
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (983) (1,673)
Other comprehensive income before reclassifications, net of tax 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 53 7
Total other comprehensive (loss) income, net of tax 53 7
Balance (930) (1,666)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]    
Balance 1,021 866
Other comprehensive income before reclassifications, net of tax 1,096 88
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0
Total other comprehensive (loss) income, net of tax 1,096 88
Balance 2,117 954
AOCI Attributable to Parent [Member]    
Balance (9,807) (12,752)
Other comprehensive income before reclassifications, net of tax (22,854) 2,064
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 221 146
Total other comprehensive (loss) income, net of tax (22,633) 2,210
Balance $ (32,440) $ (10,542)