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Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period $ 37,812 $ 49,641
Total gains or losses included in earnings 2,409 (4,208)
Total gains or losses included in other comprehensive income 5,490 1,166
Purchases 0 0
Issuances 0 0
Sales (15,981) (7,027)
Settlements (5,398) (7,727)
Transfers from Level 3 0 (11,965)
Transfers into Level 3 461 17,932
Balance, end of period 24,793 37,812
Pooled Trust Preferred Collateralized Debt Obligations [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 22,980 26,352
Total gains or losses included in earnings 0 0
Total gains or losses included in other comprehensive income 5,490 1,284
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (5,097) (4,656)
Transfers from Level 3 0 0
Transfers into Level 3 0 0
Balance, end of period 23,373 22,980
Equities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 1,420 1,570
Total gains or losses included in earnings 0 (150)
Total gains or losses included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers from Level 3 0 0
Transfers into Level 3 0 0
Balance, end of period 1,420 1,420
Loans Held for Sale [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 13,412 0
Total gains or losses included in earnings 2,870 0
Total gains or losses included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales (15,981) 0
Settlements (301) 0
Transfers from Level 3 0 0
Transfers into Level 3 0 13,412
Balance, end of period 0 13,412
Other Assets [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 0 0
Total gains or losses included in earnings (461) (4,449)
Total gains or losses included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 (71)
Transfers from Level 3 0 0
Transfers into Level 3 461 4,520
Balance, end of period 0 0
Obligations of States and Political Subdivisions [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period   343
Total gains or losses included in earnings   4
Total gains or losses included in other comprehensive income   (20)
Purchases   0
Issuances   0
Sales   (327)
Settlements   0
Transfers from Level 3   0
Transfers into Level 3   0
Balance, end of period   0
Corporate Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period   21,376
Total gains or losses included in earnings   387
Total gains or losses included in other comprehensive income   (98)
Purchases   0
Issuances   0
Sales   (6,700)
Settlements   (3,000)
Transfers from Level 3   (11,965)
Transfers into Level 3   0
Balance, end of period   $ 0