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Other Comprehensive Income (Loss) - Changes in Components of OCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total other comprehensive income (loss), pre-tax $ 32,600 $ 25,029 $ (9,908)
Total other comprehensive income (loss), tax expense (benefit) 8,296 6,369 (2,523)
Other comprehensive income (loss), net of tax 24,304 18,660 (7,385)
Total securities available for sale      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, pre-tax 27,788    
Other comprehensive income (loss) before reclassifications, tax expense (benefit) 7,071    
Other comprehensive income (loss), before reclassifications, net of tax 20,717    
Reclassification from AOCI, pre-tax (46)    
Reclassification from AOCI, tax expense (benefit) (12)    
Reclassification from AOCI, net of tax (34)    
Total other comprehensive income (loss), pre-tax 27,742 27,494 (11,139)
Total other comprehensive income (loss), tax expense (benefit) 7,059 6,997 (2,836)
Other comprehensive income (loss), net of tax 20,683 20,497 (8,303)
Total derivative instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, pre-tax 923 (2,975) 490
Other comprehensive income (loss) before reclassifications, tax expense (benefit) 235 (758) 125
Other comprehensive income (loss), before reclassifications, net of tax 688 (2,217) 365
Reclassification from AOCI, pre-tax 2,040    
Reclassification from AOCI, tax expense (benefit) 519    
Reclassification from AOCI, net of tax 1,521    
Total other comprehensive income (loss), pre-tax 2,963 (2,975) 490
Total other comprehensive income (loss), tax expense (benefit) 754 (758) 125
Other comprehensive income (loss), net of tax 2,209 (2,217) 365
Net gain arising during the period      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, pre-tax 1,069 91 413
Other comprehensive income (loss) before reclassifications, tax expense (benefit) 272 23 105
Other comprehensive income (loss), before reclassifications, net of tax 797 68 308
Reclassification adjustment for settlement loss related to the VERP realized in net income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from AOCI, pre-tax 567    
Reclassification from AOCI, tax expense (benefit) 145    
Reclassification from AOCI, net of tax 422    
New prior service cost      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from AOCI, pre-tax (485)    
Reclassification from AOCI, tax expense (benefit) (123)    
Reclassification from AOCI, net of tax (362)    
Amortization of net actuarial loss recognized in net periodic pension cost      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from AOCI, pre-tax 259    
Reclassification from AOCI, tax expense (benefit) 66    
Reclassification from AOCI, net of tax 193    
Amortization of net actuarial loss recognized in net periodic pension cost      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from AOCI, pre-tax 485 419 328
Reclassification from AOCI, tax expense (benefit) 123 107 83
Reclassification from AOCI, net of tax 362 312 245
Total defined benefit pension and post-retirement benefit plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total other comprehensive income (loss), pre-tax 1,895 510 741
Total other comprehensive income (loss), tax expense (benefit) 483 130 188
Other comprehensive income (loss), net of tax $ 1,412 380 553
Unrealized holding gains on securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, pre-tax   24,983 (11,155)
Other comprehensive income (loss) before reclassifications, tax expense (benefit)   6,358 (2,840)
Other comprehensive income (loss), before reclassifications, net of tax   18,625 (8,315)
Reclassification adjustment for gains realized in net income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from AOCI, pre-tax   2,511 16
Reclassification from AOCI, tax expense (benefit)   639 4
Reclassification from AOCI, net of tax   $ 1,872 $ 12