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Business Combinations - Schedule of Supplemental Pro Forma Information (Detail) (CBI [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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CBI [Member]
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| Business Acquisition [Line Items] | ||
| Net interest income - pro forma (unaudited) | $ 42,281 | $ 36,073 |
| Net earnings - pro forma (unaudited) | $ 7,166 | $ 5,401 |
| Diluted earnings per common share (unaudited) | $ 0.96 | $ 0.73 |