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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 16, 2009 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Plans | Jun. 30, 2012 | Dec. 31, 2012
Number of days on which collection of interest on principal is no longer probable |  |  |  | 90 days |  |
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status |  |  |  | 6 months |  |
Original terms of modified loans |  |  |  | 6 months |  |
Number of days on which charge-offs unsecured consumer loans are recorded |  |  |  | 120 days |  |
Maximum loan amount for credit review process |  |  |  | $ 1,000,000 |  |
Agreed percentage of loss in loss sharing agreement | 80.00% |  |  |  |  |
Loss recoveries on covered assets | 144,000,000 |  |  |  |  |
Loss amount with respect to covered assets | 26,700,000 |  |  |  |  |
Agreed percentage of reimbursement in loss reimburse agreement | 95.00% |  |  |  |  |
Goodwill impairment |  |  |  | 0 |  |
Goodwill |  | 55,097,000 |  | 55,097,000 |  | 55,097,000
Core deposit and premiums |  | 2,514,000 |  | 2,514,000 |  | 3,389,000
Accumulated amortization |  | 29,500,000 |  | 29,500,000 |  |
Amortization of intangible assets |  | 437,000 | 452,000 | 875,000 | 1,268,000 |
Estimated amortization expense remainder of 2013 |  | 252,000 |  | 252,000 |  |
Estimated amortization expense for 2014 |  | 475,000 |  | 475,000 |  |
Estimated amortization expense for 2015 |  | 437,000 |  | 437,000 |  |
Estimated amortization expense for 2016 |  | 395,000 |  | 395,000 |  |
Estimated amortization expense for 2017 |  | 366,000 |  | 366,000 |  |
Estimated amortization expense from 2018 to 2019 |  | $ 589,000 |  | $ 589,000 |  |
Approximately weighted average remaining life of intangible assets |  |  |  | 2 years |  |
Number of stock-based compensation plans |  |  |  | 3 |  |
Commercial loans [Member] |  |  |  |  |  |
Loss sharing agreement term | 5 years |  |  |  |  |
Loss recovery provision term | 8 years |  |  |  |  |
Single-family residential loans [Member] |  |  |  |  |  |
Loss sharing agreement term | 10 years |  |  |  |  |
Loss recovery provision term | 10 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Number of days over which principal or interest payments are past due to consider non-covered loans |  |  |  | 30 days |  |
Number of days for which principal or interest payments on non-covered loans remain accrual |  |  |  | 30 days |  |
Length of modified debt term |  |  |  | 3 months |  |
Maximum [Member] |  |  |  |  |  |
Number of days for which principal or interest payments on non-covered loans remain accrual |  |  |  | 89 days |  |
Length of modified debt term |  |  |  | 12 months |  |

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