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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (1,470) $ (27,621)
Unrealized losses on available for sale securities, 12 months or more (11,008) (25,516)
Total unrealized losses on available for sale securities (12,478) (53,137)
Fair value of unrealized losses on available for sale securities, less than 12 months 600,609 2,789,260
Fair value of unrealized losses on available for sale securities, 12 months or more 708,913 787,969
Total fair value of unrealized losses on available for sale securities $ 1,309,522 $ 3,577,229
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 23 105
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 36 38
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (78) $ (524)
Unrealized losses on held to maturity securities, 12 months or more (253) (769)
Total unrealized losses on held to maturity securities (331) (1,293)
Fair value of unrealized losses on held to maturity securities, less than 12 months $ 11,209 $ 81,390
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security 23 30
Fair value of unrealized losses on held to maturity securities, 12 months or more $ 20,734 $ 27,157
Total fair value of unrealized losses on held to maturity securities $ 31,943 $ 108,547
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security 21 84
US Treasury Securities [Member]    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months   $ (2)
Unrealized losses on available for sale securities, 12 months or more   0
Total unrealized losses on available for sale securities   (2)
Fair value of unrealized losses on available for sale securities, less than 12 months   997
Fair value of unrealized losses on available for sale securities, 12 months or more   0
Total fair value of unrealized losses on available for sale securities   $ 997
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security   1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security   0
Obligations of state and political subdivisions (municipal securities) [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (75) $ (146)
Unrealized losses on held to maturity securities, 12 months or more (71) (193)
Total unrealized losses on held to maturity securities (146) (339)
Fair value of unrealized losses on held to maturity securities, less than 12 months 10,029 23,137
Fair value of unrealized losses on held to maturity securities, 12 months or more 5,599 9,254
Total fair value of unrealized losses on held to maturity securities $ 15,628 $ 32,391
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 20 53
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 17 24
Private Label [Member]    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (1) $ (1)
Unrealized losses on available for sale securities, 12 months or more (22) (13)
Total unrealized losses on available for sale securities (23) (14)
Fair value of unrealized losses on available for sale securities, less than 12 months 76 83
Fair value of unrealized losses on available for sale securities, 12 months or more 1,382 1,565
Total fair value of unrealized losses on available for sale securities $ 1,458 $ 1,648
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 1 1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 3 3
GNMA Commercial Mortgage-Related Securities [Member]    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (1,390) $ (9,610)
Unrealized losses on available for sale securities, 12 months or more (10,140) (18,891)
Total unrealized losses on available for sale securities (11,530) (28,501)
Fair value of unrealized losses on available for sale securities, less than 12 months 558,620 1,132,844
Fair value of unrealized losses on available for sale securities, 12 months or more 448,861 448,218
Total fair value of unrealized losses on available for sale securities $ 1,007,481 $ 1,581,062
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 20 40
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 21 21
FNMA and FHLMC [Member] | Residential Related Securities [Member]    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ 0 $ (1,548)
Unrealized losses on available for sale securities, 12 months or more (846) (6,612)
Total unrealized losses on available for sale securities (846) (8,160)
Fair value of unrealized losses on available for sale securities, less than 12 months 0 220,852
Fair value of unrealized losses on available for sale securities, 12 months or more 258,670 338,186
Total fair value of unrealized losses on available for sale securities $ 258,670 $ 559,038
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 0 17
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 12 14
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ (3) $ (177)
Unrealized losses on held to maturity securities, 12 months or more (177) (468)
Total unrealized losses on held to maturity securities (180) (645)
Fair value of unrealized losses on held to maturity securities, less than 12 months 1,180 12,754
Fair value of unrealized losses on held to maturity securities, 12 months or more 13,587 11,106
Total fair value of unrealized losses on held to maturity securities $ 14,767 $ 23,860
FNMA and FHLMC [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 1 10
FNMA and FHLMC [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 5 3
GNMA [Member] | Residential Related Securities [Member]    
Unrealized losses and fair value of available for sale securities , by investment category and time length    
Unrealized losses on available for sale securities, less than 12 months $ (79) $ (16,460)
Unrealized losses on available for sale securities, 12 months or more 0 0
Total unrealized losses on available for sale securities (79) (16,460)
Fair value of unrealized losses on available for sale securities, less than 12 months 41,913 1,434,484
Fair value of unrealized losses on available for sale securities, 12 months or more 0 0
Total fair value of unrealized losses on available for sale securities $ 41,913 $ 1,434,484
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security 2 46
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security 0 0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Unrealized losses on held to maturity securities, less than 12 months $ 0 $ (201)
Unrealized losses on held to maturity securities, 12 months or more (5) (108)
Total unrealized losses on held to maturity securities (5) (309)
Fair value of unrealized losses on held to maturity securities, less than 12 months 0 45,499
Fair value of unrealized losses on held to maturity securities, 12 months or more 1,548 6,797
Total fair value of unrealized losses on held to maturity securities $ 1,548 $ 52,296
GNMA [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 0 21
GNMA [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]    
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]    
Number of held to maturity securities in a continuous unrealized loss position | security 1 3