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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
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