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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Before-Tax Amount
Net unrealized gains/losses	$ (5,059)	$ 3,433	$ (24,112)	$ 5,806
Tax (Expense) Benefit
Net unrealized gains/losses	1,240	(1,373)	5,907	(2,321)
Net of Tax
Net current-period other comprehensive (loss) income	(3,819)	2,060	(18,205)	3,485
Net unrealized gains/losses
Before-Tax Amount
Change in net unrealized gain/loss during the period	(5,335)	3,051	(24,686)	5,044
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(170)	0	(294)	0
Net unrealized gains/losses	(5,505)	3,051	(24,980)	5,044
Tax (Expense) Benefit
Change in net unrealized gain/loss during the period	1,307	(1,220)	6,048	(2,016)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	42	0	72	0
Net unrealized gains/losses	1,349	(1,220)	6,120	(2,016)
Net of Tax
Change in net unrealized gain/loss during the period	(4,028)	1,831	(18,638)	3,028
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(128)	0	(222)	0
Net current-period other comprehensive (loss) income	(4,156)	1,831	(18,860)	3,028
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	442	397	860	754
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(108)	(159)	(211)	(302)
Net of Tax
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	334	238	649	452
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	(15)	8	8
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(1)	6	(2)	(3)
Net of Tax
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	3	(9)	6	5
Employee benefit plans
Before-Tax Amount
Net unrealized gains/losses	446	382	868	762
Tax (Expense) Benefit
Net unrealized gains/losses	(109)	(153)	(213)	(305)
Net of Tax
Net current-period other comprehensive (loss) income	$ 337	$ 229	$ 655	$ 457

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