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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 3,981 | $ 3,660 | $ 3,596 | $ 4,635 | $ 3,631 | $ 3,680 | $ 5,181 | $ 4,725 | $ 15,872 | $ 17,217 | $ 12,745
Adjustment to reconcile net income to net cash from (used for) operating activities: |  |  |  |  |  |  |  |  |  |  |
Gain on sale of fixed assets |  |  |  |  |  |  |  |  | (67) | (1) |
Cash flows used for investing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of premises and equipment |  |  |  |  |  |  |  |  | 139 | 3 |
Net cash used for investing activities |  |  |  |  |  |  |  |  | (146,180) | (63,575) | (11,904)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net proceeds from common stock issuance |  |  |  |  |  |  |  |  | 32,821 |  |
Net cash from financing activities |  |  |  |  |  |  |  |  | 129,185 | 47,000 | 2,534
Increase in cash and due from financial institutions |  |  |  |  |  |  |  |  | 3,824 | 1,134 | 5,703
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 15,872 | 17,217 | 12,745
Adjustment to reconcile net income to net cash from (used for) operating activities: |  |  |  |  |  |  |  |  |  |  |
Change in other assets and other liabilities |  |  |  |  |  |  |  |  | (2,147) | 1,821 | 1,324
Gain on sale of fixed assets |  |  |  |  |  |  |  |  | (66) |  |
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | (17,496) | (18,529) | (463)
Net cash (used for) from operating activities |  |  |  |  |  |  |  |  | (3,837) | 509 | 13,606
Cash flows used for investing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of premises and equipment |  |  |  |  |  |  |  |  | 138 |  |
Acquisition and additional capitalization of subsidiary, net of cash acquired |  |  |  |  |  |  |  |  | (275) |  | (16,637)
Net cash used for investing activities |  |  |  |  |  |  |  |  | (137) |  | (16,637)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Cash paid on fractional shares on preferred stock conversion to common stock |  |  |  |  |  |  |  |  |  | (1) |
Net proceeds from common stock issuance |  |  |  |  |  |  |  |  | 32,821 |  |
Payment to repurchase common stock |  |  |  |  |  |  |  |  | (4) |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (3,682) | (3,254) | (3,139)
Net cash from financing activities |  |  |  |  |  |  |  |  | 29,135 | (3,255) | (3,139)
Increase in cash and due from financial institutions |  |  |  |  |  |  |  |  | 25,161 | (2,746) | (6,170)
Cash and cash equivalents at beginning of year |  |  |  | $ 4,747 |  |  |  | $ 7,493 | 4,747 | 7,493 | 13,663
Cash and cash equivalents at end of year | $ 29,908 |  |  |  | $ 4,747 |  |  |  | $ 29,908 | $ 4,747 | $ 7,493

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