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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period $ (24,881) $ (10,427) $ (8,211)
Other comprehensive income (loss) before reclassifications 17,818 (13,064) (2,535)
Amounts reclassified from accumulated other comprehensive income (loss) 8,080 1,557 319
Other comprehensive income (loss), net of tax 25,898 (11,507) (2,216)
AOCI reclassification to retained earnings from adoption of ASU 2018-02   (2,947)  
Balance at the end of the period 1,017 (24,881) (10,427)
Benefit Plans      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period (6,450) (5,998) (6,195)
Other comprehensive income (loss) before reclassifications 20 382 (365)
Amounts reclassified from accumulated other comprehensive income (loss) 6,281 926 562
Other comprehensive income (loss), net of tax 6,301 1,308 197
AOCI reclassification to retained earnings from adoption of ASU 2018-02   (1,760)  
Balance at the end of the period (149) (6,450) (5,998)
Unrealized Gains and Losses on Securities Available for Sale      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period (18,394) (4,278) (1,708)
Other comprehensive income (loss) before reclassifications 28,245 (13,479) (2,157)
Amounts reclassified from accumulated other comprehensive income (loss) 2,071 510 (413)
Other comprehensive income (loss), net of tax 30,316 (12,969) (2,570)
AOCI reclassification to retained earnings from adoption of ASU 2018-02   (1,147)  
Balance at the end of the period 11,922 (18,394) (4,278)
Gains and Losses on Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning of the period (37) (151) (308)
Other comprehensive income (loss) before reclassifications (10,447) 33 (13)
Amounts reclassified from accumulated other comprehensive income (loss) (272) 121 170
Other comprehensive income (loss), net of tax (10,719) 154 157
AOCI reclassification to retained earnings from adoption of ASU 2018-02   (40)  
Balance at the end of the period $ (10,756) (37) $ (151)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss)      
AOCI reclassification to retained earnings from adoption of ASU 2018-02   $ (2,947)