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Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance $ 187,379 $ 200,460 $ 433,910
Gains (Losses) included in earnings (16,825) (36,480) (19,567)
Gains (losses) included in OCI 66 (18) 744
Issuances     2,603
Purchases 29,949 39,113 44,891
Sales (12,011) (12,746) (50,126)
Settlements (5,291) (2,950) (14,352)
Transfers into Level 3 2,405 0 0
Transfers out of Level 3 (7,616) 0 (197,643)
Ending Balance 178,056 187,379 200,460
Changes in unrealized gains (losses) relating to assets still held at reporting date 7,655 (19,350) (6,240)
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance (99,762) (92,994) 0
Gains (Losses) included in earnings (12,600) (6,080) (3,855)
Gains (losses) included in OCI 0 0 0
Initial fair value on acquisition   (688) (89,139)
Purchases 0 0 0
Sales 0 0 0
Settlements 360 0 0
Transfer into Level 3 0 0 0
Transfer out of Level 3 0 0 0
Ending Balance (112,002) (99,762) (92,994)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (13,347) (6,380) (3,855)
Other Liabilities Member | Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member]
     
Liabilities, Fair Value Disclosure [Abstract]      
Beginning Balance (99,762) (92,994) 0
Gains (Losses) included in earnings (12,600) (6,080) (3,855)
Gains (losses) included in OCI 0 0 0
Initial fair value on acquisition   (688) (89,139)
Purchases 0 0 0
Sales 0 0 0
Settlements 360 0 0
Transfer into Level 3 0 0 0
Transfer out of Level 3   0 0
Ending Balance (112,002) (99,762) (92,994)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (13,347) (6,380) (3,855)
Available For Sale Securities Member | Collateralized Mortgage Backed Securities [Member]
     
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 7,435 7,759 34,122
Gains (Losses) included in earnings (6) (7) (8)
Gains (losses) included in OCI 66 (18) 744
Issuances     2,502
Purchases 0 0 0
Sales 0 0 0
Settlements (425) (299) (2,305)
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 (27,296)
Ending Balance 7,070 7,435 7,759
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 0 0
Trading Account Assets[Member] | Collateralized Mortgage Backed Securities [Member]
     
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 21,777 20,238 223,766
Gains (Losses) included in earnings 680 108 3,737
Gains (losses) included in OCI 0 0 0
Issuances     101
Purchases 6,499 13,395 23,451
Sales (9,824) (9,956) (48,928)
Settlements (2,104) (2,008) (11,542)
Transfers into Level 3 2,405 0 0
Transfers out of Level 3 (7,616) 0 (170,347)
Ending Balance 11,817 21,777 20,238
Changes in unrealized gains (losses) relating to assets still held at reporting date (165) 133 178
Trading Account Assets[Member] | Collateralized Mortgage Obligations Member
     
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 2,808 2,746 2,787
Gains (Losses) included in earnings 30 21 1
Gains (losses) included in OCI 0 0 0
Issuances     0
Purchases 608 752 715
Sales (250) (341) (302)
Settlements (697) (370) (455)
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Ending Balance 2,499 2,808 2,746
Changes in unrealized gains (losses) relating to assets still held at reporting date 23 7 (5)
Trading Account Assets[Member] | Other Securities [Member]
     
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 4,036 2,810 3,488
Gains (Losses) included in earnings (123) 459 (438)
Gains (losses) included in OCI 0 0 0
Issuances     0
Purchases 2,116 3,263 706
Sales (1,834) (2,449) (896)
Settlements (1,955) (47) (50)
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Ending Balance 2,240 4,036 2,810
Changes in unrealized gains (losses) relating to assets still held at reporting date (333) 698 (450)
Mortgage Servicing Rights Member
     
Assets, Fair Value Disclosure [Abstract]      
Beginning Balance 151,323 166,907 169,747
Gains (Losses) included in earnings (17,406) (37,061) (22,859)
Gains (losses) included in OCI 0 0 0
Issuances     0
Purchases 20,726 21,703 20,019
Sales (103) 0 0
Settlements (110) (226) 0
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Ending Balance 154,430 151,323 166,907
Changes in unrealized gains (losses) relating to assets still held at reporting date 8,130 (20,188) (5,963)
Mortgage Servicing Rights Member | Other Liabilities Member
     
Liabilities, Fair Value Disclosure [Abstract]      
Transfer out of Level 3 $ 0