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Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (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 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
|
Jun. 30, 2013
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Jun. 30, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
|
Jun. 30, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
|
Jun. 30, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
|
Jun. 30, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
|
Jun. 30, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Interest-Only Strip [Member]
|
Jun. 30, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Interest-Only Strip [Member]
|
Jun. 30, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Interest-Only Strip [Member]
|
Mar. 31, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Interest-Only Strip [Member]
|
Jun. 30, 2014
Tax (Expense) Benefit [Member]
|
Jun. 30, 2013
Tax (Expense) Benefit [Member]
|
Jun. 30, 2014
Tax (Expense) Benefit [Member]
|
Jun. 30, 2013
Tax (Expense) Benefit [Member]
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| Accumulated Other Comprehensive Income [Line Items] | ||||||||||||||||
| Balance at beginning of period | $ (5,509) | $ 5,095 | $ (9,380) | $ 5,418 | $ (11,510) | $ 6,771 | $ (18,187) | $ 7,348 | $ 19 | $ 16 | $ 16 | $ 17 | $ 5,984 | $ (1,695) | $ 8,791 | $ (1,946) |
| Other comprehensive (loss) income before reclassification | 3,723 | (3,158) | 9,015 | (3,472) | 6,340 | (5,553) | 14,438 | (6,121) | (2) | 1 | 1 | (2,617) | 2,397 | (5,424) | 2,648 | |
| Reclassification from accumulated other comprehensive income | (364) | (303) | (1,785) | (312) | (364) | (303) | (1,785) | (312) | ||||||||
| Other comprehensive income (loss) | 3,359 | (3,461) | 7,230 | (3,784) | 5,976 | (5,856) | 12,653 | (6,433) | (2) | 1 | 1 | (2,617) | 2,397 | (5,424) | 2,648 | |
| Balance at end of period | $ (2,150) | $ 1,634 | $ (2,150) | $ 1,634 | $ (5,534) | $ 915 | $ (5,534) | $ 915 | $ 17 | $ 17 | $ 17 | $ 17 | $ 3,367 | $ 702 | $ 3,367 | $ 702 |