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Transfers of financial assets and mortgage servicing assets (Tables)
 6 Months Ended
Jun. 30, 2018
Transfers and Servicing of Financial Assets  
Schedule Of Securitizations Of Financial Assets Accounted For As Sale [Text Block]
Proceeds Obtained During the Quarter Ended June 30, 2018
(In thousands)Level 1Level 2Level 3Initial Fair Value
Assets
Debt securities available-for-sale:
Mortgage-backed securities - FNMA$-$1,238$-$1,238
Total debt securities available-for-sale$-$1,238$-$1,238
Trading account debt securities:
Mortgage-backed securities - GNMA$-$97,363$-$97,363
Mortgage-backed securities - FNMA-19,203-19,203
Total trading account debt securities$-$116,566$-$116,566
Mortgage servicing rights$-$-$2,158$2,158
Total $-$117,804$2,158$119,962

Proceeds Obtained During the Six Months Ended June 30, 2018
(In thousands)Level 1Level 2Level 3Initial Fair Value
Assets
Debt securities available-for-sale:
Mortgage-backed securities - FNMA$-$6,960$-$6,960
Total debt securities available-for-sale$-$6,960$-$6,960
Trading account debt securities:
Mortgage-backed securities - GNMA$-$209,858$-$209,858
Mortgage-backed securities - FNMA-39,228-39,228
Total trading account debt securities$-$249,086$-$249,086
Mortgage servicing rights$-$-$4,573$4,573
Total $-$256,046$4,573$260,619

Proceeds Obtained During the Quarter Ended June 30, 2017
(In thousands)Level 1Level 2Level 3Initial Fair Value
Assets
Debt securities available-for-sale:
Mortgage-backed securities - FNMA$-$6,968$-$6,968
Total debt securities available-for-sale$-$6,968$-$6,968
Trading account debt securities:
Mortgage-backed securities - GNMA$-$135,961$-$135,961
Mortgage-backed securities - FNMA-30,455-30,455
Total trading account debt securities$-$166,416$-$166,416
Mortgage servicing rights$-$-$2,708$2,708
Total $-$173,384$2,708$176,092

Proceeds Obtained During the Six Months Ended June 30, 2017
(In thousands)Level 1Level 2Level 3Initial Fair Value
Assets
Debt securities available-for-sale:
Mortgage-backed securities - FNMA$-$11,720$-$11,720
Total debt securities available-for-sale$-$11,720$-$11,720
Trading account debt securities:
Mortgage-backed securities - GNMA$-$282,938$-$282,938
Mortgage-backed securities - FNMA-53,346-53,346
Total trading account debt securities$-$336,284$-$336,284
Mortgage servicing rights$-$-$5,178$5,178
Total $-$348,004$5,178$353,182
Schedule Of Servicing Assets At Fair Value Text Block
Residential MSRs
(In thousands)June 30, 2018June 30, 2017
Fair value at beginning of period$168,031$196,889
Additions4,9235,839
Changes due to payments on loans[1](6,852)(9,276)
Reduction due to loan repurchases(2,077)(1,102)
Changes in fair value due to changes in valuation model inputs or assumptions-(3,622)
Fair value at end of period$164,025$188,728
[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
Quarters endedSix months ended
June 30, 2018June 30, 2017June 30, 2018June 30, 2017
Prepayment speed4.4%4.4%4.4%4.0%
Weighted average life (in years)11.410.911.411.1
Discount rate (annual rate)11.1%11.0%11.1%11.0%
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets
Originated MSRsPurchased MSRs
June 30,December 31,June 30,December 31,
(In thousands)2018201720182017
Fair value of servicing rights$69,232$73,951$94,793$94,080
Weighted average life (in years)7.67.36.96.5
Weighted average prepayment speed (annual rate)4.4%5.1%4.9%5.7%
Impact on fair value of 10% adverse change$(1,231)$(1,503)$(1,761)$(2,070)
Impact on fair value of 20% adverse change$(2,430)$(2,976)$(3,473)$(3,999)
Weighted average discount rate (annual rate)11.5%11.5%11.0%11.0%
Impact on fair value of 10% adverse change$(3,108)$(3,091)$(4,101)$(3,785)
Impact on fair value of 20% adverse change$(5,985)$(5,971)$(7,902)$(7,235)