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Borrowings - Schedule of Remaining Borrowing Capacity with FHLB (Parenthetical) (Detail) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 07, 2015 | Dec. 31, 2014 | Aug. 10, 2010 | Oct. 31, 2009 | Jun. 30, 2009 | Aug. 31, 2008 | Feb. 28, 2008
Interest Rate 2.09% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings |  | 2.09% |  |  |  |  |  |
Interest Rate 0.43% and 0.27% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 0.43% |  | 0.27% |  |  |  |  |
Interest Rate 4.6% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.60% |  | 4.60% |  |  | 4.60% |  |
FHLB advances, floating rate description | 3 month LIBOR + 0.16% |  |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.16% |  |  |  |  |  |  |
Interest Rate 4.02% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.02% |  | 4.02% |  |  |  |  | 4.02%
FHLB advances, floating rate description | 3 month LIBOR + 0.11% |  |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.11% |  |  |  |  |  |  |
Interest Rate 4.10% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.10% |  | 4.10% |  |  |  | 4.10% |
FHLB advances, floating rate description | 3 month LIBOR + 0.11% |  |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.11% |  |  |  |  |  |  |
Interest Rate 4.47% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.47% |  | 4.47% | 4.47% |  |  |  |
FHLB advances, floating rate description | 3 month LIBOR + 0.11% |  |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.11% |  |  |  |  |  |  |
Interest Rate 3.97% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 3.97% |  | 3.97% |  | 3.97% |  |  |
FHLB advances, floating rate description | 3 month LIBOR + 0.10% |  |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.10% |  |  |  |  |  |  |
Interest Rate 1.25% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 1.25% |  |  |  |  |  |  |
Interest Rate 1.35% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 1.35% |  |  |  |  |  |  |
Interest Rate 4.72% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.72% |  |  |  |  |  |  |
Interest Rate 4.31%[Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.31% |  |  |  |  |  |  |
Interest Rate 3.05% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 3.05% |  |  |  |  |  |  |
Interest Rate 5.24% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 5.24% |  |  |  |  |  |  |
Interest Rate 3.35% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 3.35% |  |  |  |  |  |  |
Interest Rate 4.00% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 4.00% |  |  |  |  |  |  |
Interest Rate 2.96% [Member] |  |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |  |
Fixed rate on borrowings | 2.96% |  |  |  |  |  |  |

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