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Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Comprehensive Income (Loss), Pretax [Abstract]    
Other comprehensive income (loss) $ (96,713) $ 27,704
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Other comprehensive income (loss) (22,700) 10,233
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Change in unamortized net holding losses on debt securities held to maturity 2,019 666
Unamortized unrealized net holding losses on debt securities available for sale transferred to debt securities held to maturity (30,487) 0
Less: non-credit related impairment on debt securities held to maturity 200 0
Change in unamortized non-credit related impairment on debt securities held to maturity 130 223
Net change in unamortized holding losses on debt securities held to maturity (28,538) 889
Other comprehensive (loss) income, net of tax (74,013) 17,471
Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity    
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding (losses) gains arising during period from debt securities available for sale (72,346) 26,933
Less: reclassification adjustment for net gains on sale of debt securities in net income (2,019) (666)
Other comprehensive (loss) income, net of tax   27,599
Accumulated Gains (Losses) on Cash Flow Hedging Instruments    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Other comprehensive income (loss) (87) (15,686)
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Other comprehensive income (loss) 150 (5,820)
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding (losses) gains arising during period from debt securities available for sale (7,407) (6,285)
Less: reclassification adjustment for net gains on sale of debt securities in net income (7,170) 3,581
Other comprehensive (loss) income, net of tax (237) (9,866)
Defined Benefit Plan Adjustment    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Other comprehensive income (loss) (4,425) (773)
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Other comprehensive income (loss) (1,046) (288)
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding (losses) 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 3,379 485
Other comprehensive (loss) income, net of tax (3,379) (485)
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 (losses) gains arising during period from debt securities available for sale (54,845) 42,751
Less: reclassification adjustment for net gains on sale of debt securities in net income 0 0
Other comprehensive income (loss) (54,845) 42,751
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Unrealized holding (losses) gains arising during period from debt securities available for sale (12,986) 15,818
Less: reclassification adjustment for net gains on sale of debt securities in net income 0 0
Other comprehensive income (loss) (12,986) 15,818
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding (losses) gains arising during period from debt securities available for sale (41,859) 26,933
Less: reclassification adjustment for net gains on sale of debt securities in net income 0 0
Other comprehensive (loss) income, net of tax (41,859) 26,933
Held-to-maturity Securities | Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Change in unamortized net holding losses on debt securities held to maturity 2,639 1,058
Unamortized unrealized net holding losses on debt securities available for sale transferred to debt securities held to maturity (39,904) 0
Less: non-credit related impairment on debt securities held to maturity 262 0
Change in unamortized non-credit related impairment on debt securities held to maturity 171 354
Net change in unamortized holding losses on debt securities held to maturity (37,356) 1,412
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Change in unamortized net holding losses on debt securities held to maturity 620 392
Unamortized unrealized net holding losses on debt securities available for sale transferred to debt securities held to maturity (9,417) 0
Less: non-credit related impairment on debt securities held to maturity 62 0
Change in unamortized non-credit related impairment on debt securities held to maturity 41 131
Net change in unamortized holding losses on debt securities held to maturity (8,818) 523
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Change in unamortized net holding losses on debt securities held to maturity 2,019 666
Unamortized unrealized net holding losses on debt securities available for sale transferred to debt securities held to maturity (30,487) 0
Less: non-credit related impairment on debt securities held to maturity 200 0
Change in unamortized non-credit related impairment on debt securities held to maturity 130 223
Net change in unamortized holding losses on debt securities held to maturity $ (28,538) $ 889