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Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount	$ 2,804	$ (2,931)	$ 20,075	$ (13,378)
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit	(598)	623	(4,281)	2,841
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount	2,206	(2,308)	15,794	(10,537)
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale	2,350	(3,521)	18,716	(15,291)	[1]
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on debt securities available-for-sale	(501)	748	(3,991)	3,247	[1]
Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale	1,849	(2,773)	14,725	(12,044)	[1]
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount	454	590	1,359	1,913
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit	(97)	(125)	(290)	(406)
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount	$ 357	$ 465	$ 1,069	$ 1,507
[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.

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