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Other Comprehensive Income (Loss) - Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Before-Tax Amount      
Other Comprehensive Income, Net unrealized losses $ 25,961 $ (15,813) $ (6,097)
Tax (Expense) Benefit      
Other Comprehensive Income, Net unrealized losses (6,360) 3,879 1,868
Net of Tax      
Unrealized gains on HTM securities transferred to AFS securities 2,852 0 0
Other comprehensive income (loss) 19,601 (11,934) (4,229)
Available-for-sale securities      
Before-Tax Amount      
Other comprehensive gain (loss), before reclassifications 33,431 (14,550) (4,442)
Unrealized gains on HTM securities transferred to AFS securities 3,777    
Reclassification adjustment (616) 440 407
Other Comprehensive Income, Net unrealized losses 36,592 (14,110) (4,035)
Tax (Expense) Benefit      
Other comprehensive gain (loss), before reclassifications (8,190) 3,569 1,761
Unrealized gains on HTM securities transferred to AFS securities (925)    
Reclassification adjustment 151 (108) (163)
Other Comprehensive Income, Net unrealized losses (8,964) 3,461 1,598
Net of Tax      
Other comprehensive gain (loss), before reclassifications 25,241 (10,981) (2,681)
Unrealized gains on HTM securities transferred to AFS securities 2,852    
Reclassification adjustment (465) 332 244
Other comprehensive income (loss) 27,628 (10,649) (2,437)
Net retirement plan actuarial (loss) gain      
Before-Tax Amount      
Other comprehensive gain (loss), before reclassifications (10,122) (3,437) (4,549)
Reclassification adjustment 1,677 1,719 1,508
Tax (Expense) Benefit      
Other comprehensive gain (loss), before reclassifications 2,480 843 1,115
Reclassification adjustment (411) (421) (603)
Net of Tax      
Other comprehensive gain (loss), before reclassifications (7,642) (2,594) (3,434)
Reclassification adjustment 1,266 1,298 905
Gain due to curtailment      
Before-Tax Amount      
Other comprehensive gain (loss), before reclassifications (399)    
Tax (Expense) Benefit      
Other comprehensive gain (loss), before reclassifications 97    
Net of Tax      
Other comprehensive gain (loss), before reclassifications (302)    
Net retirement plan prior service credit      
Before-Tax Amount      
Other comprehensive gain (loss), before reclassifications (1,819)   964
Reclassification adjustment 32 15 15
Tax (Expense) Benefit      
Other comprehensive gain (loss), before reclassifications 446   (236)
Reclassification adjustment (8) (4) (6)
Net of Tax      
Other comprehensive gain (loss), before reclassifications (1,373)   728
Reclassification adjustment 24 11 9
Employee benefit plans      
Before-Tax Amount      
Other Comprehensive Income, Net unrealized losses (10,631) (1,703) (2,062)
Tax (Expense) Benefit      
Other Comprehensive Income, Net unrealized losses 2,604 418 270
Net of Tax      
Other comprehensive income (loss) $ (8,027) $ (1,285) $ (1,792)