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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Assets Fair Value Disclosure Abstract        
Beginning Balance $ 186,658 $ 201,554 $ 187,379 $ 200,460
Gains (Losses) included in earnings (5,529) (9,552) (3,711) (15,532)
Gains (losses) included in OCI 207 (5) 200 2
Purchases 10,548 14,652 18,204 23,692
Sales (3,371) (2,205) (7,540) (3,779)
Settlements (2,504) (903) (3,312) (1,302)
Transfers into Level 3 0 0 2,405 0
Transfers out of Level 3 0 0 (7,616) 0
Ending Balance 186,009 203,541 186,009 203,541
Changes in unrealized gains (losses) relating to assets still held at reporting date (129) (5,071) 5,671 (6,822)
Liabilities Fair Value Disclosure Abstract        
Beginning Balance (100,834) (94,483) (99,762) (92,994)
Gains (Losses) included in earnings (179) (1,595) (1,251) (3,084)
Gains (losses) included in OCI 0 0 0 0
Initial fair value on acquisition   138   138
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Ending Balance (101,013) (95,940) (101,013) (95,940)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (179) (1,595) (1,251) (3,084)
Other Liabilities Member | Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member]
       
Liabilities Fair Value Disclosure Abstract        
Beginning Balance (100,834) (94,483) (99,762) (92,994)
Gains (Losses) included in earnings (179) (1,595) (1,251) (3,084)
Gains (losses) included in OCI 0 0 0 0
Initial fair value on acquisition   138   138
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Ending Balance (101,013) (95,940) (101,013) (95,940)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (179) (1,595) (1,251) (3,084)
Available For Sale Securities Member | Collateralized Mortgage Backed Securities [Member]
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 7,226 7,715 7,435 7,759
Gains (Losses) included in earnings (1) (1) (3) (3)
Gains (losses) included in OCI 207 (5) 200 2
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (50) (75) (250) (124)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 7,382 7,634 7,382 7,634
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 16,363 20,862 21,777 20,238
Gains (Losses) included in earnings 39 87 977 159
Gains (losses) included in OCI 0 0 0 0
Purchases 2,955 8,273 6,313 10,220
Sales (1,377) (1,667) (5,455) (2,787)
Settlements (275) (476) (696) (751)
Transfers into Level 3 0 0 2,405 0
Transfers out of Level 3 0 0 (7,616) 0
Ending Balance 17,705 27,079 17,705 27,079
Changes in unrealized gains (losses) relating to assets still held at reporting date 60 152 31 207
Trading Account Assets[Member] | Collateralized Mortgage Obligations Member
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 2,750 2,678 2,808 2,746
Gains (Losses) included in earnings (4) 1 57 1
Gains (losses) included in OCI 0 0 0 0
Purchases 546 371 607 396
Sales (251) (251) (251) (316)
Settlements (186) (161) (366) (189)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 2,855 2,638 2,855 2,638
Changes in unrealized gains (losses) relating to assets still held at reporting date 51 0 51 (1)
Trading Account Assets[Member] | Other
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 3,988 2,883 4,036 2,810
Gains (Losses) included in earnings 12 439 49 560
Gains (losses) included in OCI 0 0 0 0
Purchases 2,054 536 2,060 924
Sales (1,743) (287) (1,834) (676)
Settlements (1,955) 0 (1,955) (47)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 2,356 3,571 2,356 3,571
Changes in unrealized gains (losses) relating to assets still held at reporting date (4) 712 70 824
Servicing Asset At Fair Value Amount [Member]
       
Assets Fair Value Disclosure Abstract        
Beginning Balance 156,331 167,416 151,323 166,907
Gains (Losses) included in earnings (5,575) (10,078) (4,791) (16,249)
Gains (losses) included in OCI 0 0 0 0
Purchases 4,993 5,472 9,224 12,152
Sales 0 0 0 0
Settlements (38) (191) (45) (191)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 155,711 162,619 155,711 162,619
Changes in unrealized gains (losses) relating to assets still held at reporting date $ (236) $ (5,935) $ 5,519 $ (7,852)