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Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Other Comprehensive Income (Loss), Pretax [Abstract]    
Other comprehensive income $ 27,704 $ 106,163
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Other comprehensive income 10,233 38,772
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Change in unamortized net holding losses on investment securities held to maturity 666 529
Change in unamortized non-credit related impairment on investment securities held to maturity 223 222
Net change in unamortized holding losses on securities held to maturity 889 751
Other comprehensive income, net of tax 17,471 67,391
Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity    
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding gains arising during period from securities available for sale 26,933 68,264
Less: reclassification adjustment for net gains on sale of securities in net income (666) 4,765
Other comprehensive income, net of tax 27,599 63,499
Accumulated Gains (Losses) on Cash Flow Hedging Instruments    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Other comprehensive income (15,686) 4,305
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Other comprehensive income (5,820) 1,566
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding gains arising during period from securities available for sale (6,285) 3,068
Less: reclassification adjustment for net gains on sale of securities in net income 3,581 329
Other comprehensive income, net of tax (9,866) 2,739
Defined Benefit Plan Adjustment    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Other comprehensive income (773) 1,300
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Other comprehensive income (288) 369
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding gains arising during period from securities available for sale 0 0
Less: reclassification adjustment for net gains on sale of securities in net income 485 (931)
Other comprehensive income, net of tax (485) 931
Available-for-sale Securities | Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Unrealized holding gains arising during period from securities available for sale 42,751 107,725
Less: reclassification adjustment for net gains on sale of securities in net income 0 8,353
Other comprehensive income 42,751 99,372
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Unrealized holding gains arising during period from securities available for sale 15,818 39,461
Less: reclassification adjustment for net gains on sale of securities in net income 0 3,059
Other comprehensive income 15,818 36,402
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Unrealized holding gains arising during period from securities available for sale 26,933 68,264
Less: reclassification adjustment for net gains on sale of securities in net income 0 5,294
Other comprehensive income, net of tax 26,933 62,970
Held-to-maturity Securities | Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity    
Other Comprehensive Income (Loss), Pretax [Abstract]    
Change in unamortized net holding losses on investment securities held to maturity 1,058 835
Change in unamortized non-credit related impairment on investment securities held to maturity 354 351
Net change in unamortized holding losses on securities held to maturity 1,412 1,186
Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract]    
Change in unamortized net holding losses on investment securities held to maturity 392 306
Change in unamortized non-credit related impairment on investment securities held to maturity 131 129
Net change in unamortized holding losses on securities held to maturity 523 435
Other Comprehensive Income (Loss), After-Tax [Abstract]    
Change in unamortized net holding losses on investment securities held to maturity 666 529
Change in unamortized non-credit related impairment on investment securities held to maturity 223 222
Net change in unamortized holding losses on securities held to maturity $ 889 $ 751