Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount	$ 7,851	$ (8,853)
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit	(1,675)	1,880
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount	6,176	(6,973)
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale	7,398	(9,474)
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	0	0
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on debt securities available-for-sale	(1,578)	2,012
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	0	0
Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale	5,820	(7,462)
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	0	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount	453	621
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit	(97)	(132)
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount	$ 356	$ 489