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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Before-Tax Amount
Net unrealized gains/losses	$ 14,272	$ (5,059)	$ 30,449	$ (24,112)
Tax (Expense) Benefit
Net unrealized gains/losses	(3,496)	1,240	(7,458)	5,907
Net of Tax
Other comprehensive income (loss)	10,776	(3,819)	22,991	(18,205)
Net unrealized gains/losses
Before-Tax Amount
Change in net unrealized gain/loss during the period	14,140	(5,335)	29,892	(24,686)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(271)	(170)	(271)	(294)
Net unrealized gains/losses	13,869	(5,505)	29,621	(24,980)
Tax (Expense) Benefit
Change in net unrealized gain/loss during the period	(3,464)	1,307	(7,322)	6,048
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	67	42	67	72
Net unrealized gains/losses	(3,397)	1,349	(7,255)	6,120
Net of Tax
Change in net unrealized gain/loss during the period	10,676	(4,028)	22,570	(18,638)
Net of tax	(204)	(128)	(204)	(222)
Other comprehensive income (loss)	10,472	(4,156)	22,366	(18,860)
Amortization of net retirement plan actuarial gain
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	400	442	821	860
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(98)	(108)	(201)	(211)
Net of Tax
Net of tax	302	334	620	649
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	3	4	7	8
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(1)	(1)	(2)	(2)
Net of Tax
Net of tax	2	3	5	6
Employee benefit plans
Before-Tax Amount
Net unrealized gains/losses	403	446	828	868
Tax (Expense) Benefit
Net unrealized gains/losses	(99)	(109)	(203)	(213)
Net of Tax
Other comprehensive income (loss)	$ 304	$ 337	$ 625	$ 655

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