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Deposits and Short-Term Borrowings - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Time Deposits [Line Items]
Time deposit balance threshold	$ 100,000	$ 100,000
Time deposits of $100,000 or more totaled	354,775,000	433,813,000
Deposits received from related parties	109,638,000	93,267,000
Short-term borrowings [Member]
Time Deposits [Line Items]
Securities sold under agreements to repurchase	$ 235,572,000	$ 205,561,000

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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- Definition

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

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