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Schedule of Remaining Contractual Maturities of Repurchase Agreements by Type of Collateral Pledged (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase $ 122,158 $ 121,742
U.S. Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 53,724  
Mortgage-backed Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 67,887  
Municipal securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 547  
Overnight and Continuous    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 70,675  
Overnight and Continuous | U.S. Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 53,724  
Overnight and Continuous | Mortgage-backed Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 16,951  
Up to 30 Days    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 34  
Up to 30 Days | Mortgage-backed Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 34  
30-90 Days    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 9  
30-90 Days | Mortgage-backed Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 9  
Greater Than 90 Days    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 51,440  
Greater Than 90 Days | Mortgage-backed Agency securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 50,893  
Greater Than 90 Days | Municipal securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase $ 547