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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income, Gross	$ 19,931	$ 67,574
Unrealized holding gains during the period, Gross	(85,315)	25,785
Amounts reclassified into net income: HTM securities, Gross	(12)	(49)
Amounts reclassified into net income: Realized losses on disposals of AFS securities, Gross	4,549	1,510
Total unrealized (losses) gains on investment securities, Gross	(80,778)	27,246
Amount reclassified into net income: Net actuarial loss, Gross	532	507
Total defined pension and other post-retirement benefit plans, Gross	532	507
Other comprehensive (loss) income, Gross	(80,246)	27,753
Comprehensive (loss) income before tax	(60,315)	95,327
Net income, Tax	1,006	17,134
Unrealized holding gains during the period, Tax	(17,917)	9,024
Amounts reclassified into net income: HTM securities, Tax	(2)	(17)
Amounts reclassified into net income: Realized losses on disposals of AFS securities, Tax	955	529
Total unrealized (losses) gains on investment securities, Tax	(16,964)	9,536
Amount reclassified into net income: Net actuarial loss, Tax	112	177
Total defined pension and other post-retirement benefit plans, Tax	112	177
Other comprehensive (loss) income, Tax	(16,852)	9,713
Comprehensive (loss) income, Tax	(15,846)	26,847
Net income	18,925	50,440
Unrealized holding gains arising during period	(67,398)	16,761
Amounts reclassified into net income: HTM Securities	(10)	(32)
Amounts reclassified into net income: Realized losses on disposals of available-for-sale securities	3,594	981
Total unrealized (losses) gains on investment securities	(63,814)	17,710
Amount reclassified into net income: Net actuarial loss	420	330
Total defined benefit pension and post-retirement plans	420	330
Other comprehensive (loss) income	(63,394)	18,040
Comprehensive (loss) income	$ (44,469)	$ 68,480

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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