Comprehensive Income - Changes in Components of OCI (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Other Comprehensive Income (Loss), Pretax [Abstract]
Other comprehensive income	$ 477,292	$ 97,183
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Other comprehensive income	113,881	23,034
Other Comprehensive Income (Loss), After-Tax [Abstract]
Change in unamortized net holding losses on debt securities held to maturity	(1,575)	(1,743)
Change in unamortized non-credit related impairment on debt securities held to maturity	(118)	(368)
Change in defined benefit plans	(1,754)	(3,119)
Other comprehensive income, net of tax	363,411	74,149
Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity
Other Comprehensive Income (Loss), After-Tax [Abstract]
Unrealized holding gains arising during period from debt securities available for sale	99,699	51,700
Less: reclassification adjustment for net gains on sale of debt securities in net income	12,997	5,091
Other comprehensive income, net of tax	86,702	46,609
Accumulated Gains (Losses) on Cash Flow Hedging Instruments
Other Comprehensive Income (Loss), Pretax [Abstract]
Other comprehensive income	360,963	31,518
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Other comprehensive income	86,126	7,465
Other Comprehensive Income (Loss), After-Tax [Abstract]
Unrealized holding gains arising during period from debt securities available for sale	278,675	23,001
Less: reclassification adjustment for net gains on sale of debt securities in net income	3,838	(1,052)
Other comprehensive income, net of tax	274,837	24,053
Defined Benefit Plan Adjustment
Other Comprehensive Income (Loss), Pretax [Abstract]
Change in defined benefit plans	2,301	4,089
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Change in defined benefit plans	547	970
Other Comprehensive Income (Loss), After-Tax [Abstract]
Unrealized holding gains arising during period from debt securities available for sale	0	0
Less: reclassification adjustment for net gains on sale of debt securities in net income	(1,754)	(3,119)
Change in defined benefit plans	1,754	3,119
Other comprehensive income, net of tax	1,754	3,119
Available-for-sale Securities \| Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity
Other Comprehensive Income (Loss), Pretax [Abstract]
Unrealized holding gains arising during period from debt securities available for sale	130,943	67,768
Less: reclassification adjustment for net gains on sale of debt securities in net income	19,139	8,958
Other comprehensive income	111,804	58,810
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Unrealized holding gains arising during period from debt securities available for sale	31,244	16,068
Less: reclassification adjustment for net gains on sale of debt securities in net income	4,567	2,124
Other comprehensive income	26,677	13,944
Other Comprehensive Income (Loss), After-Tax [Abstract]
Unrealized holding gains arising during period from debt securities available for sale	99,699	51,700
Less: reclassification adjustment for net gains on sale of debt securities in net income	14,572	6,834
Other comprehensive income, net of tax	85,127	44,866
Held-to-maturity Securities \| Change in unamortized net holding gains on debt securities held to maturity
Other Comprehensive Income (Loss), Pretax [Abstract]
Change in unamortized net holding gains on debt securities held to maturity	2,069	2,284
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Change in unamortized net holding gains on debt securities held to maturity	494	541
Other Comprehensive Income (Loss), After-Tax [Abstract]
Change in unamortized net holding losses on debt securities held to maturity	1,575	1,743
Held-to-maturity Securities \| Change in unamortized non-credit related impairment on debt securities held to maturity
Other Comprehensive Income (Loss), Pretax [Abstract]
Change in unamortized non-credit related impairment on debt securities held to maturity	155	482
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Change in unamortized non-credit related impairment on debt securities held to maturity	37	114
Other Comprehensive Income (Loss), After-Tax [Abstract]
Change in unamortized non-credit related impairment on debt securities held to maturity	118	368
Held-to-maturity Securities \| Unrealized Gains (Losses) on Debt Securities Held to Maturity
Other Comprehensive Income (Loss), Pretax [Abstract]
Other comprehensive income	2,224	2,766
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]
Other comprehensive income	531	655
Other Comprehensive Income (Loss), After-Tax [Abstract]
Other comprehensive income, net of tax	$ 1,693	$ 2,111

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