Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pre-Tax Amount
Other comprehensive income (loss), before tax		$ 391	$ (1,377)	$ 1,816	$ 16,637
Tax (Expense) Benefit
Other comprehensive income (loss), tax		(137)	482	(636)	(5,823)
Net of Tax Amount
Other Comprehensive Income/(Loss)		254	(895)	1,180	10,814
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Change in net unrealized gains/(losses) on securities available-for-sale		(148)	(1,921)	4,186	11,748
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	0	(3,987)	0
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on securities available-for-sale		52	672	(1,470)	(4,112)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	0	1,400	0
Net of Tax Amount
Change in net unrealized gains/(losses) on securities available-for-sale		(96)	(1,249)	2,716	7,636
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	0	(2,587)	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other comprehensive income (loss), before tax		539	544	1,617	4,889
Tax (Expense) Benefit
Other comprehensive income (loss), tax		(189)	(190)	(566)	(1,711)
Net of Tax Amount
Other Comprehensive Income/(Loss)		$ 350	$ 354	$ 1,051	$ 3,178

[1] Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income and have affected certain lines in the consolidated statement of comprehensive income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.