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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period $ 1,017    
Other comprehensive income (loss), net of tax 46,572 $ 25,898 $ (11,507)
Balance at the end of the period 47,589 1,017  
Benefit Plans      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period (149) (6,450) (5,998)
Other comprehensive income (loss) before reclassifications (119) 20 382
Amounts reclassified from accumulated other comprehensive income 117 6,281 926
Other comprehensive income (loss), net of tax (2) 6,301 1,308
AOCI reclassification to retained earnings from adoption of ASU 2018-02     (1,760)
Balance at the end of the period (151) (149) (6,450)
Unrealized Gains and Losses on Securities Available for Sale      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period 11,922 (18,394) (4,278)
Other comprehensive income (loss) before reclassifications 35,857 28,245 (13,479)
Amounts reclassified from accumulated other comprehensive income (39) 2,071 510
Other comprehensive income (loss), net of tax 35,818 30,316 (12,969)
AOCI reclassification to retained earnings from adoption of ASU 2018-02     (1,147)
Balance at the end of the period 47,740 11,922 (18,394)
Gains and Losses on Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period (10,756) (37) (151)
Other comprehensive income (loss) before reclassifications (26,140) (10,447) 33
Amounts reclassified from accumulated other comprehensive income 36,896 (272) 121
Other comprehensive income (loss), net of tax 10,756 (10,719) 154
AOCI reclassification to retained earnings from adoption of ASU 2018-02     (40)
Balance at the end of the period   (10,756) (37)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period 1,017 (24,881) (10,427)
Other comprehensive income (loss) before reclassifications 9,598 17,818 (13,064)
Amounts reclassified from accumulated other comprehensive income 36,974 8,080 1,557
Other comprehensive income (loss), net of tax 46,572 25,898 (11,507)
AOCI reclassification to retained earnings from adoption of ASU 2018-02     (2,947)
Balance at the end of the period $ 47,589 $ 1,017 $ (24,881)