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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 182,195 $ 40,367 $ (35,305) $ (22,225)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 148,190 77,520 (13,401)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (6,362) (1,848) 164  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 141,828 75,672 (13,237)  
Unrealized Gains and Losses on Available-for-Sale Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 163,174 33,038 (33,128) (19,779)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 130,355 67,802 (13,425)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (219) (1,636) (81)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 130,136 66,166 (13,506)  
Unrealized Gains and Losses on Pension Plan Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (5,833) (3,974) (2,177) (2,446)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (2,177) (2,042) 24  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 318 245 245  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1,859) (1,797) 269  
Unrealized Gains and Losses from Hedging Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 24,854 11,303 0 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 20,012 11,760 0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (6,461) (457) 0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent $ 13,551 $ 11,303 $ 0  
Accounting Standards Update 2016-01        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU       0
Accounting Standards Update 2016-01 | Unrealized Gains and Losses on Available-for-Sale Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU       157
Accounting Standards Update 2016-01 | Unrealized Gains and Losses on Pension Plan Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU       0
Accounting Standards Update 2016-01 | Unrealized Gains and Losses from Hedging Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU       $ 0