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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Balance $ 571,921 $ 549,683 $ 579,672 $ 565,390 $ 559,559 $ 549,464 $ 579,672 $ 549,464
Total other comprehensive income (loss) , net of tax 5,214 8,918 (22,633) (2,353) (74) 2,210 (8,501) (217)
Balance 586,406 571,921 549,683 568,392 565,390 559,559 586,406 568,392
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                
Balance (2,708)   (3,982) (3,815)   (15,649) (3,982) (15,649)
Other comprehensive income before reclassifications, net of tax 3,185     (475)     4,397 11,349
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0     0     62 10
Total other comprehensive income (loss) , net of tax 3,185     (475)     4,459 11,359
Balance 477 (2,708)   (4,290) (3,815)   477 (4,290)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Balance (21,473)   (5,863) (6,132)   3,704 (5,863) 3,704
Other comprehensive income before reclassifications, net of tax 937     (1,664)     (15,215) (10,914)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 929     (282)     1,471 (868)
Total other comprehensive income (loss) , net of tax 1,866     (1,946)     (13,744) (11,782)
Balance (19,607) (21,473)   (8,078) (6,132)   (19,607) (8,078)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Balance (878)   (983) (1,658)   (1,673) (983) (1,673)
Other comprehensive income before reclassifications, net of tax 0     0     0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 52     7     157 22
Total other comprehensive income (loss) , net of tax 52     7     157 22
Balance (826) (878)   (1,651) (1,658)   (826) (1,651)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]                
Balance 1,537   1,021 989   866 1,021 866
Other comprehensive income before reclassifications, net of tax 111     61     627 184
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0     0     0 0
Total other comprehensive income (loss) , net of tax 111     61     627 184
Balance 1,648 1,537   1,050 989   1,648 1,050
AOCI Attributable to Parent [Member]                
Balance (23,522) (32,440) (9,807) (10,616) (10,542) (12,752) (9,807) (12,752)
Other comprehensive income before reclassifications, net of tax 4,233     (2,078)     (10,191) 619
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 981     (275)     1,690 (836)
Total other comprehensive income (loss) , net of tax 5,214 8,918 (22,633) (2,353) (74) 2,210 (8,501) (217)
Balance $ (18,308) $ (23,522) $ (32,440) $ (12,969) $ (10,616) $ (10,542) $ (18,308) $ (12,969)