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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income, Gross	$ 73,694	$ 19,931
Unrealized holding (losses) gains during the period, Gross	102,926	(85,315)
Amounts reclassified into net income: HTM securities, Gross	(9)	(12)
Amounts reclassified into net income: Realized (gains) losses on disposals and OTTI of AFS securities, Gross	(1,077)	4,549
Total unrealized gains (losses) on investment securities, Gross	101,840	(80,778)
Amount reclassified into net income: Net actuarial loss, Gross	664	532
Total defined pension and other post-retirement benefit plans, Gross	664	532
Other comprehensive income (loss), Gross	102,504	(80,246)
Comprehensive income (loss) before tax	176,198	(60,315)
Net income, Tax	12,346	1,006
Unrealized holding (losses) gains during the period, Tax	21,613	(17,917)
Amounts reclassified into net income: HTM securities, Tax	(2)	(2)
Amounts reclassified into net income: Realized (gains) losses on disposals and OTTI of AFS securities, Tax	(226)	955
Total unrealized gains (losses) on investment securities, Tax	21,385	(16,964)
Amount reclassified into net income: Net actuarial loss, Tax	139	112
Total defined pension and other post-retirement benefit plans, Tax	139	112
Other comprehensive income (loss), Tax	21,524	(16,852)
Comprehensive income (loss), Tax	33,870	(15,846)
Net income	61,348	18,925
Unrealized holding (losses) gains arising during period	81,313	(67,398)
Amounts reclassified into net income: HTM Securities	(7)	(10)
Amounts reclassified into net income: Realized (gains) losses on disposals and OTTI of available-for-sale securities	(851)	3,594
Total unrealized gains (losses) on investment securities	80,455	(63,814)
Amount reclassified into net income: Net actuarial loss	525	420
Total defined benefit pension and post-retirement plans	525	420
Other comprehensive income (loss)	80,980	(63,394)
Comprehensive income (loss)	$ 142,328	$ (44,469)

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