Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Loss) (Detail)

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Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period $ 5,095 $ 4,201 $ 5,418 $ 3,524
Other comprehensive (loss) income before reclassification (3,158) 218 (3,472) 896
Reclassification from accumulated other comprehensive income (303) (1,265) (312) (1,266)
Other comprehensive loss (3,461) (1,047) (3,784) (370)
Balance at end of period 1,634 3,154 1,634 3,154
Accumulated Net Unrealized Investment Gain (Loss) [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 6,771 4,789 7,348 4,115
Other comprehensive (loss) income before reclassification (5,553) (82) (6,121) 593
Reclassification from accumulated other comprehensive income (303) (1,265) (312) (1,266)
Other comprehensive loss (5,856) (1,347) (6,433) (673)
Balance at end of period 915 3,442 915 3,442
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Interest-Only-Strip [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 19 23 16 20
Other comprehensive (loss) income before reclassification (2) (9) 1 (6)
Other comprehensive loss (2) (9) 1 (6)
Balance at end of period 17 14 17 14
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Swap [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period   (9)   (9)
Other comprehensive (loss) income before reclassification   9   9
Other comprehensive loss   9   9
Tax Expense Benefit [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (1,695) (602) (1,946) (602)
Other comprehensive (loss) income before reclassification 2,397 300 2,648 300
Other comprehensive loss 2,397 300 2,648 300
Balance at end of period $ 702 $ (302) $ 702 $ (302)