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Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pre-Tax Amount        
Other Comprehensive Income/(Loss), Pre-Tax Amount $ 9,420 $ (1,594) $ 17,271 $ (10,447)
Tax (Expense) Benefit        
Other Comprehensive Income/(Loss), Tax (Expense) Benefit (2,008) 338 (3,683) 2,218
Net of Tax Amount        
Other Comprehensive Income/(Loss), Net of Tax Amount 7,412 (1,256) 13,588 (8,229)
Accumulated Net Investment Gain (Loss) Attributable to Parent        
Pre-Tax Amount        
Change in net unrealized gains/(losses) on debt securities available-for-sale 8,968 (2,296) 16,366 (11,770) [1]
Tax (Expense) Benefit        
Change in net unrealized gains/(losses) on debt securities available-for-sale (1,912) 487 (3,490) 2,499 [1]
Net of Tax Amount        
Change in net unrealized gains/(losses) on debt securities available-for-sale 7,056 (1,809) 12,876 (9,271) [1]
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent        
Pre-Tax Amount        
Other Comprehensive Income/(Loss), Pre-Tax Amount 452 702 905 1,323
Tax (Expense) Benefit        
Other Comprehensive Income/(Loss), Tax (Expense) Benefit (96) (149) (193) (281)
Net of Tax Amount        
Other Comprehensive Income/(Loss), Net of Tax Amount $ 356 $ 553 $ 712 $ 1,042
[1] Due to the adoption of ASU No. 2016-01, net unrealized gains on marketable equity securities were reclassified from accumulated other comprehensive income to retained earnings during the three months ended March 31, 2018. The prior period data was not restated; as such, the change in unrealized gains on marketable securities is combined with the change in net unrealized gains on debt securities for the period ended September 30, 2017.