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Investment Securities - Summary of Continuous Loss Position of Securities (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Investment [Line Items] |  |
Fair Value, Less than 12 months | $ 194,146,000 | $ 233,909,000
Gross Unrealized Holding Losses, Less than 12 months | 1,109,000 | 1,206,000
Fair Value, 12 months or longer | 70,017,000 |
Gross unrealized holding losses, 12 months or longer | 859,000 |
Fair Value | 264,163,000 | 233,909,000
Gross Unrealized Holding Losses | 1,968,000 | 1,206,000
Gross unrealized holding losses | 0 |
CMO [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months |  | 2,383,000
Gross Unrealized Holding Losses, Less than 12 months |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Fair Value |  | 2,383,000
Gross unrealized holding losses |  |
Government agency [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 51,134,000 |
Gross Unrealized Holding Losses, Less than 12 months | 248,000 |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Fair Value | 51,134,000 |
Gross Unrealized Holding Losses | 248,000 |
Residential Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 55,118,000 | 75,754,000
Gross Unrealized Holding Losses, Less than 12 months | 127,000 | 334,000
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Fair Value | 55,118,000 | 75,754,000
Gross Unrealized Holding Losses | 127,000 | 334,000
CMO's / REMIC's-residential [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 74,784,000 | 133,471,000
Gross Unrealized Holding Losses, Less than 12 months | 572,000 | 665,000
Fair Value, 12 months or longer | 69,042,000 |
Gross unrealized holding losses, 12 months or longer | 838,000 |
Fair Value | 143,826,000 | 133,471,000
Gross Unrealized Holding Losses | 1,410,000 | 665,000
Municipal bonds [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months | 13,110,000 | 22,184,000
Gross Unrealized Holding Losses, Less than 12 months | 162,000 | 203,000
Fair Value, 12 months or longer | 975,000 |
Gross unrealized holding losses, 12 months or longer | 21,000 |
Fair Value | 14,085,000 | 22,184,000
Gross Unrealized Holding Losses | 183,000 | 203,000
Other Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, Less than 12 months |  | 2,500,000
Gross Unrealized Holding Losses, Less than 12 months |  | 4,000
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Fair Value |  | 2,500,000
Gross Unrealized Holding Losses |  | $ 4,000

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