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Transfers of financial assets and mortgage servicing assets (Tables)
3 Months Ended
Mar. 31, 2014
Schedule Of Securitizations Of Financial Assets Accounted For As Sale [Text Block]
  Proceeds Obtained During the Quarter Ended March 31, 2014
(In thousands)Level 1Level 2Level 3Initial Fair Value
Assets        
Trading account securities:        
Mortgage-backed securities - GNMA$ -$ 165,932$ -$ 165,932
Mortgage-backed securities - FNMA  -  62,583  -  62,583
Total trading account securities$ -$ 228,515$ -$ 228,515
Mortgage servicing rights  -  -  3,198  3,198
Total $ -$ 228,515$ 3,198$ 231,713

  Proceeds Obtained During the Quarter Ended March 31, 2013
(In thousands)Level 1Level 2Level 3Initial Fair Value
Assets        
Trading account securities:        
Mortgage-backed securities - GNMA$ -$ 285,252$ -$ 285,252
Mortgage-backed securities - FNMA  -  128,142  -  128,142
Total trading account securities$ -$ 413,394$ -$ 413,394
Mortgage servicing rights  -  -  4,743  4,743
Total $ -$ 413,394$ 4,743$ 418,137
Schedule Of Servicing Assets At Fair Value Text Block
Residential MSRs
(In thousands)March 31, 2014March 31, 2013
Fair value at beginning of period$ 161,099$ 154,430
Purchases  -  45
Servicing from securitizations or asset transfers  3,528  5,102
Changes due to payments on loans[1]  (4,151)  (6,064)
Reduction due to loan repurchases  (922)  (995)
Changes in fair value due to changes in valuation model inputs or assumptions  (3,023)  1,444
Other disposals  (2)  (13)
Fair value at end of period$ 156,529$ 153,949
[1] Represents changes due to collection / realization of expected cash flows over time.    
Schedule Of Assumptions For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Servicing Liabilities Text Block
  Quarter ended
 March 31, 2014March 31, 2013
Prepayment speed 6.2% 8.2%
Weighted average life16.1years 12.2years
Discount rate (annual rate) 10.7% 11.1%
Originated Mortgage Servicing Rights M S R [Member]
 
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets
 Originated MSRs
        
(In thousands)March 31, 2014December 31, 2013
Fair value of servicing rights$ 113,563 $ 115,753 
Weighted average life 12.5years 12.5years
Weighted average prepayment speed (annual rate)  8.0%  8.0%
 Impact on fair value of 10% adverse change$ (4,550) $ (3,763) 
 Impact on fair value of 20% adverse change$ (8,166) $ (7,459) 
Weighted average discount rate (annual rate)  11.6%  11.6%
 Impact on fair value of 10% adverse change$ (5,602) $ (4,930) 
 Impact on fair value of 20% adverse change$ (10,091) $ (9,595) 
Purchased Mortgage Servicing Rights M S R [Member]
 
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets
 Purchased MSRs
        
(In thousands)March 31, 2014December 31, 2013
Fair value of servicing rights$ 42,966 $ 45,346 
Weighted average life 11.0years 10.9years
Weighted average prepayment speed (annual rate)  9.1%  9.2%
 Impact on fair value of 10% adverse change$ (1,783) $ (1,969) 
 Impact on fair value of 20% adverse change$ (3,210) $ (3,478) 
Weighted average discount rate (annual rate)  10.9%  10.8%
 Impact on fair value of 10% adverse change$ (1,865) $ (2,073) 
 Impact on fair value of 20% adverse change$ (3,346) $ (3,655)