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Fair Value of Financial Instruments (Detail) - Changes in Fair Value Measurement Levels (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Total net losses for the year included in    
Other-than-temporary impairment losses on investment securities $ 268 $ 69
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
   
Balance, beginning of period 4,922 57,028
Balance, end of period 5,141 54,024
Total net losses for the year included in    
Other-than-temporary impairment losses on investment securities 0 (69)
Mortgage and other loan income 0 0
Other comprehensive income, gross 172 274
Purchases 47 215
Servicing assets that resulted from transfers of financial assets 0 0
Paydowns 0 (3,424)
Residential Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member]
   
Balance, beginning of period 13,910 10,663
Balance, end of period 15,297 11,898
Total net losses for the year included in    
Other-than-temporary impairment losses on investment securities 0 0
Mortgage and other loan income (431) (538)
Other comprehensive income, gross 0 0
Purchases 0 0
Servicing assets that resulted from transfers of financial assets 1,818 1,773
Paydowns $ 0 $ 0