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Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Total cash and cash equivalents $ 76,441 $ 70,832 $ 48,650 $ 43,476
Other assets 40,963 44,620    
Total assets 3,964,303 3,141,156    
Liabilities        
Borrowings 564,157 267,489    
Subordinated debentures 37,653 37,456    
Other liabilities 23,526 23,674    
Stockholders' Equity 457,078 340,855 266,832 194,414
Total liabilities and stockholders' equity 3,964,303 3,141,156    
Parent Company [Member]        
Assets        
Total cash and cash equivalents 13,361 15,736 $ 26,507 $ 19,195
Investment in Subsidiaries 497,623 386,389    
Other assets 1,318 2,504    
Total assets 512,302 404,629    
Liabilities        
Borrowings 12,500 19,500    
Subordinated debentures 37,653 37,456    
Other liabilities 5,071 6,818    
Stockholders' Equity 457,078 340,855    
Total liabilities and stockholders' equity $ 512,302 $ 404,629