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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loan by Internal Risk Ratings (Parenthetical) (Detail) (Non-Covered Loans [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	$ 514,409,000	$ 512,792,000
Commercial real estate	762,017,000	729,951,000
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	16,825,000	17,950,000
Commercial real estate	28,592,000	57,934,000
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	362,000	430,000
Commercial real estate	0	0
Loans classified as loss	0	0
American Security Bank [Member] \| Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired	7,200,000
Commercial and industrial	1,700,000
Commercial real estate	4,800,000
Consumer loans	$ 729,000

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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