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Parent Company Only Condensed Financial Information - Schedule of Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 3,631 | $ 3,680 | $ 5,181 | $ 4,725 | $ 3,199 | $ 3,253 | $ 3,122 | $ 3,171 | $ 17,217 | $ 12,745 | $ 9,528
Investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used for investing activities |  |  |  |  |  |  |  |  | (63,575) | (11,904) | (48,496)
Financing activities: |  |  |  |  |  |  |  |  |  |  |
Payment to repurchase preferred stock |  |  |  |  |  |  |  |  |  |  | (22,857)
Net cash from financing activities |  |  |  |  |  |  |  |  | 47,000 | 2,534 | 29,282
Increase (decrease) in cash and due from financial institutions |  |  |  |  |  |  |  |  | 1,134 | 5,703 | (4,328)
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 17,217 | 12,745 | 9,528
Adjustment to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Change in other assets and other liabilities |  |  |  |  |  |  |  |  | 1,821 | 1,324 | 1,508
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | (18,529) | (463) | (3,750)
Net cash from operating activities |  |  |  |  |  |  |  |  | 509 | 13,606 | 7,286
Investing activities: |  |  |  |  |  |  |  |  |  |  |
Acquisition and additional capitalization of subsidiary, net of cash acquired |  |  |  |  |  |  |  |  |  | (16,637) |
Net cash used for investing activities |  |  |  |  |  |  |  |  |  | (16,637) |
Financing activities: |  |  |  |  |  |  |  |  |  |  |
Cash paid on fractional shares on preferred stock conversion to common stock |  |  |  |  |  |  |  |  | (1) |  |
Payment to repurchase preferred stock |  |  |  |  |  |  |  |  |  |  | (22,857)
Cash dividends paid |  |  |  |  |  |  |  |  | (3,254) | (3,139) | (3,338)
Net cash from financing activities |  |  |  |  |  |  |  |  | (3,255) | (3,139) | (26,195)
Increase (decrease) in cash and due from financial institutions |  |  |  |  |  |  |  |  | (2,746) | (6,170) | (18,909)
Cash and cash equivalents at beginning of year |  |  |  | $ 7,493 |  |  |  | $ 13,663 | 7,493 | 13,663 | 32,572
Cash and cash equivalents at end of year | $ 4,747 |  |  |  | $ 7,493 |  |  |  | $ 4,747 | $ 7,493 | $ 13,663

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