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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Purchased Credit Impaired
Jun. 30, 2014
Purchased Credit Impaired
Jun. 30, 2013
Purchased Credit Impaired
Mar. 31, 2013
Purchased Credit Impaired
Dec. 31, 2012
Purchased Credit Impaired
Jun. 30, 2014
Commercial Loans
Purchased Credit Impaired
Jun. 30, 2014
Commercial Loans
Purchased Credit Impaired
Jun. 30, 2013
Commercial Loans
Purchased Credit Impaired
Mar. 31, 2013
Commercial Loans
Purchased Credit Impaired
Dec. 31, 2012
Commercial Loans
Purchased Credit Impaired
Jun. 30, 2014
Consumer Real Estate
Purchased Credit Impaired
Jun. 30, 2014
Consumer Real Estate
Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]                                
Beginning balance $ 23,798 $ 24,850 $ 24,077 $ 25,770 $ 493 $ 755 $ 8 $ 8 $ 8 $ 8 $ 77 $ 8 $ 8 $ 8 $ 485 $ 678
Purchased impaired provision 1,141 3,205 2,731 4,347 (75) (337)       8 (61)       (83) (276)
Benefit attributable to FDIC indemnification asset 138   341   138 341         55       138 286
Provision for loan losses charged to operations 1,279 3,205 3,072 4,347 63 4       8 (6)       55 10
Provision for loan losses recorded through the FDIC indemnification asset     (3,072) (4,347) (138) (341)         (55)       (138) (286)
Ending balance $ 23,911 $ 23,122 $ 23,911 $ 23,122 $ 418 $ 418 $ 8 $ 8 $ 8 $ 16 $ 16 $ 8 $ 8 $ 8 $ 402 $ 402