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Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Random sample percentage of securities for each quarter 100.00%    
Credit loss recognized $ 0 $ 0 $ 0
Total gains or losses included in earnings (111,000) (77,000)  
Interest rate swaps transferred into Level 3 from Level 2 0 3,035,000  
Corporate securities transferred from Level 3 to Level 2 0 0  
Impaired loans considered to be credit risk of non-collection 100,000    
Updated appraisal requirement floor 250,000    
Other real estate owned 9,398,000 7,197,000  
Financial instrument of credit risk 200,000 200,000  
Provision for credit losses 14,948,000 11,196,000 $ 19,227,000
Interest rate swap [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Provision for credit losses 900,000    
Loans Held for Sale [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains or losses included in earnings 0 (77,000)  
Interest rate swaps transferred into Level 3 from Level 2 0 3,035,000  
Corporate securities transferred from Level 3 to Level 2 0 0  
Other Assets [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains or losses included in earnings 0 0  
Interest rate swaps transferred into Level 3 from Level 2 0 0  
Corporate securities transferred from Level 3 to Level 2 $ 0 $ 0