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Stockholders' Equity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity [Abstract]      
Unrecognized prior service cost and net actuarial (losses) on pension plans $ (27,689) $ (15,284) $ (18,227)
Unrealized gains on derivatives (cash flow hedges) 1,821 2,144 1,772
Unrealized net holding (losses) on AFS securities (17,306) (8,937) (5,065)
AOCI $ (43,174) $ (22,077) $ (21,520)
Preceding period of retained net profits for approval of Office of Comptroller of the Currency 2 years    
Statutory amount available for dividend payments $ 174,100    
Number of shares available for repurchase under stock repurchase program (in shares) 1,000,000