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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
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Assets Fair Value Disclosure Abstract        
Beginning Balance $ 186,009 $ 203,541 $ 187,379 $ 200,460
Gains (Losses) included in earnings (2,683) (10,365) (6,394) (25,897)
Gains (losses) included in OCI (137) (40) 63 (38)
Purchases 5,374 7,590 23,578 31,282
Sales (4,389) (6,126) (11,929) (9,905)
Settlements (1,071) (743) (4,383) (2,045)
Transfers into Level 3 0 0 2,405 0
Transfers out of Level 3 0 0 (7,616) 0
Ending Balance 183,103 193,857 183,103 193,857
Changes in unrealized gains (losses) relating to assets still held at reporting date 5,498 (6,166) 10,601 (13,106)
Liabilities Fair Value Disclosure Abstract        
Beginning Balance (101,013) (95,940) (99,762) (92,994)
Gains (Losses) included in earnings (2,986) (1,657) (4,237) (4,741)
Gains (losses) included in OCI 0 0 0 0
Initial fair value on acquisition   (827)   (689)
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 311 0 311 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Ending Balance (103,688) (98,424) (103,688) (98,424)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (2,991) (1,657) (4,753) (4,741)
Other Liabilities Member | Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member]
       
Liabilities Fair Value Disclosure Abstract        
Beginning Balance (101,013) (95,940) (99,762) (92,994)
Gains (Losses) included in earnings (2,986) (1,657) (4,237) (4,741)
Gains (losses) included in OCI 0 0 0 0
Initial fair value on acquisition   (827)   (689)
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 311 0 311 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Ending Balance (103,688) (98,424) (103,688) (98,424)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (2,991) (1,657) (4,753) (4,741)
Available For Sale Securities Member | Collateralized Mortgage Backed Securities [Member]
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 7,382 7,634 7,435 7,759
Gains (Losses) included in earnings (2) (2) (5) (5)
Gains (losses) included in OCI (137) (40) 63 (38)
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (100) (100) (350) (224)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 7,143 7,492 7,143 7,492
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 0 0 0
Trading Account Assets[Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 17,705 27,079 21,777 20,238
Gains (Losses) included in earnings (230) (154) 747 5
Gains (losses) included in OCI 0 0 0 0
Purchases 80 757 6,393 10,977
Sales (4,286) (4,676) (9,741) (7,463)
Settlements (700) (529) (1,396) (1,280)
Transfers into Level 3 0 0 2,405 0
Transfers out of Level 3 0 0 (7,616) 0
Ending Balance 12,569 22,477 12,569 22,477
Changes in unrealized gains (losses) relating to assets still held at reporting date (81) (47) (173) 42
Trading Account Assets[Member] | Collateralized Mortgage Obligations Member
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 2,855 2,638 2,808 2,746
Gains (Losses) included in earnings (3) 30 54 31
Gains (losses) included in OCI 0 0 0 0
Purchases 0 18 607 414
Sales 0 (20) (251) (336)
Settlements (218) (95) (584) (284)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 2,634 2,571 2,634 2,571
Changes in unrealized gains (losses) relating to assets still held at reporting date (4) 20 47 18
Trading Account Assets[Member] | Other Securities [Member]
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 2,356 3,571 4,036 2,810
Gains (Losses) included in earnings (22) (115) 27 445
Gains (losses) included in OCI 0 0 0 0
Purchases 56 2,065 2,116 2,989
Sales 0 (1,430) (1,834) (2,106)
Settlements 0 0 (1,955) (47)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 2,390 4,091 2,390 4,091
Changes in unrealized gains (losses) relating to assets still held at reporting date 35 (115) (340) 710
Servicing Asset At Fair Value Amount [Member]
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 155,711 162,619 151,323 166,907
Gains (Losses) included in earnings (2,426) (10,124) (7,217) (26,373)
Gains (losses) included in OCI 0 0 0 0
Purchases 5,238 4,750 14,462 16,902
Sales (103) 0 (103) 0
Settlements (53) (19) (98) (210)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 158,367 157,226 158,367 157,226
Changes in unrealized gains (losses) relating to assets still held at reporting date $ 5,548 $ (6,024) $ 11,067 $ (13,876)