Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount		$ 4,523	$ 9,420	$ 26,552	$ 17,271
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit		(963)	(2,008)	(5,650)	(3,683)
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount		3,560	7,412	20,902	13,588
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale		4,201	8,968	25,765	16,366
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	[1]	(142)	0	(142)	0
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on debt securities available-for-sale		(894)	(1,912)	(5,482)	(3,490)
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	[1]	30	0	30	0
Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale		3,307	7,056	20,283	12,876
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	[1]	(112)	0	(112)	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount		464	452	929	905
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit		(99)	(96)	(198)	(193)
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount		$ 365	$ 356	$ 731	$ 712

[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/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive (Loss) Income as follows: the pre-tax amount is included in net gain on sale of securities, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.