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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
Mar. 31, 2014
Mar. 31, 2013
Assets, Fair Value Disclosure [Abstract]    
Beginning Balance $ 180,773 $ 178,057
Gains (Losses) included in earnings (8,361) (5,801)
Gains (losses) included in OCI (42) (1)
Purchases 3,941 5,179
Sales (1,109) (375)
Settlements (717) (962)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 174,485 176,097
Changes in unrealized gains (losses) relating to assets still held at reporting date (3,190) 1,360
Liabilities, Fair Value Disclosure [Abstract]    
Beginning Balance (128,299) (112,002)
Gains (Losses) included in earnings 1,168 (6,775)
Gains (losses) included in OCI 0 0
Purchases 0 0
Sales 0 0
Settlements 786 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending Balance (126,345) (118,777)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date 1,168 (6,775)
Other Liabilities Member | Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member]
   
Liabilities, Fair Value Disclosure [Abstract]    
Beginning Balance (128,299) (112,002)
Gains (Losses) included in earnings 1,168 (6,775)
Gains (losses) included in OCI 0 0
Purchases 0 0
Sales 0 0
Settlements 786 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending Balance (126,345) (118,777)
Changes in unrealized gains (losses) relating to liabilities still held at reporting date 1,168 (6,775)
Available For Sale Securities Member | Collateralized Mortgage Backed Securities [Member]
   
Assets, Fair Value Disclosure [Abstract]    
Beginning Balance 6,523 7,070
Gains (Losses) included in earnings (2) (1)
Gains (losses) included in OCI (42) (1)
Purchases 0 0
Sales 0 0
Settlements (100) (25)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 6,379 7,043
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 0
Trading Account Assets[Member] | Collateralized Mortgage Backed Securities [Member]
   
Assets, Fair Value Disclosure [Abstract]    
Beginning Balance 9,799 11,818
Gains (Losses) included in earnings (39) (92)
Gains (losses) included in OCI 0 0
Purchases 150 27
Sales (1,109) 0
Settlements (500) (817)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 8,301 10,936
Changes in unrealized gains (losses) relating to assets still held at reporting date (25) (30)
Trading Account Assets[Member] | Collateralized Mortgage Obligations Member
   
Assets, Fair Value Disclosure [Abstract]    
Beginning Balance 1,423 2,499
Gains (Losses) included in earnings (10) 3
Gains (losses) included in OCI 0 0
Purchases 263 5
Sales 0 (375)
Settlements (115) (107)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 1,561 2,025
Changes in unrealized gains (losses) relating to assets still held at reporting date (6) 2
Trading Account Assets[Member] | Other Securities [Member]
   
Assets, Fair Value Disclosure [Abstract]    
Beginning Balance 1,929 2,240
Gains (Losses) included in earnings (214) (96)
Gains (losses) included in OCI 0 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 1,715 2,144
Changes in unrealized gains (losses) relating to assets still held at reporting date (136) (55)
Mortgage Servicing Rights Member
   
Assets, Fair Value Disclosure [Abstract]    
Beginning Balance 161,099 154,430
Gains (Losses) included in earnings (8,096) (5,615)
Gains (losses) included in OCI 0 0
Purchases 3,528 5,147
Sales 0 0
Settlements (2) (13)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 156,529 153,949
Changes in unrealized gains (losses) relating to assets still held at reporting date $ (3,023) $ 1,443