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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated 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
Before-Tax Amount
Net unrealized gains/losses / Other comprehensive income (loss)	$ 4,404	$ (7,287)	$ 34,853	$ (31,398)
Tax (Expense) Benefit
Net unrealized gains/losses / Other comprehensive income (loss)	(1,081)	1,786	(8,539)	7,692
Net of Tax
Other comprehensive income (loss)	3,323	(5,501)	26,314	(23,706)
Net unrealized gain/loss
Before-Tax Amount
Change in net unrealized gain/loss during the period	4,122	(7,691)	34,014	(32,375)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(133)	(30)	(404)	(324)
Net unrealized gains/losses / Other comprehensive income (loss)	3,989	(7,721)	33,610	(32,699)
Tax (Expense) Benefit
Change in net unrealized gain/loss during the period	(1,011)	1,885	(8,333)	7,932
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	32	7	99	79
Net unrealized gains/losses / Other comprehensive income (loss)	(979)	1,892	(8,234)	8,011
Net of Tax
Change in net unrealized gain/loss during the period	3,111	(5,806)	25,681	(24,443)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(101)	(23)	(305)	(245)
Other comprehensive income (loss)	3,010	(5,829)	25,376	(24,688)
Amortization of net retirement plan actuarial gain/loss
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	411	430	1,232	1,289
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(101)	(105)	(302)	(316)
Net of Tax
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	310	325	930	973
Amortization of net retirement plan prior service cost
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	4	4	11	12
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(1)	(1)	(3)	(3)
Net of Tax
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	3	3	8	9
Employee benefit plans
Before-Tax Amount
Net unrealized gains/losses / Other comprehensive income (loss)	415	434	1,243	1,301
Tax (Expense) Benefit
Net unrealized gains/losses / Other comprehensive income (loss)	(102)	(106)	(305)	(319)
Net of Tax
Other comprehensive income (loss)	$ 313	$ 328	$ 938	$ 982

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