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Accumulated Other Comprehensive Income (Loss) - by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Balance $ 670,812 $ 675,813 $ 679,628 $ 655,167 $ 639,201 $ 618,997 $ 679,628 $ 618,997
Total other comprehensive income (loss), net of tax (15,030) (15,760) (8,820) (517) 2,286 5,563 (39,610) 7,332
Balance 670,719 670,812 675,813 668,096 655,167 639,201 670,719 668,096
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                
Balance (50,133)   (6,272) 485   1,290 (6,272) 1,290
Other comprehensive income before reclassifications, net of tax (22,797)     (2,645)     (66,658) (3,365)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0     7       (78)
Total other comprehensive income (loss), net of tax (22,797)     (2,638)     (66,658) (3,443)
Balance (72,930) (50,133)   (2,153) 485   (72,930) (2,153)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Balance 18,260   (1,406) (9,202)   (17,521) (1,406) (17,521)
Other comprehensive income before reclassifications, net of tax 7,480     179     23,657 4,885
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 710     1,812     4,199 5,425
Total other comprehensive income (loss), net of tax 8,190     1,991     27,856 10,310
Balance 26,450 18,260   (7,211) (9,202)   26,450 (7,211)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Balance (1,313)   (1,282) (1,741)   (1,884) (1,282) (1,884)
Other comprehensive income before reclassifications, net of tax 0     0        
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (9)     72     (40) 215
Total other comprehensive income (loss), net of tax (9)     72     (40) 215
Balance (1,322) (1,313)   (1,669) (1,741)   (1,322) (1,669)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]                
Balance 1,922   2,276 2,041   1,849 2,276 1,849
Other comprehensive income before reclassifications, net of tax (414)     58     (768) 250
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0     0        
Total other comprehensive income (loss), net of tax (414)     58     (768) 250
Balance 1,508 1,922   2,099 2,041   1,508 2,099
AOCI Attributable to Parent [Member]                
Balance (31,264) (15,504) (6,684) (8,417) (10,703) (16,266) (6,684) (16,266)
Other comprehensive income before reclassifications, net of tax (15,731)     (2,408)     (43,769) 1,770
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 701     1,891     4,159 5,562
Total other comprehensive income (loss), net of tax (15,030) (15,760) (8,820) (517) 2,286 5,563 (39,610) 7,332
Balance $ (46,294) $ (31,264) $ (15,504) $ (8,934) $ (8,417) $ (10,703) $ (46,294) $ (8,934)