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Components of Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Federal funds purchased $ 42,000  
Securities sold under agreements to repurchase    
Securities sold under agreements to repurchase 113,392 $ 138,614
FHLB borrowings    
Short-term advances 75,000  
Long-term advances 65,000 65,000
Total FHLB borrowings 140,000 65,000
Subordinated debt 15,464 15,464
Other debt 292 292
Total borrowings $ 311,148 $ 219,370
Federal funds purchased [1] 0.64% 0.34%
Retail [1] 0.07% 0.13%
Retail    
Securities sold under agreements to repurchase    
Securities sold under agreements to repurchase $ 63,392 $ 88,614
Wholesale    
Securities sold under agreements to repurchase    
Securities sold under agreements to repurchase $ 50,000 $ 50,000
Wholesale Repurchase Agreements    
FHLB borrowings    
Weighted average contractual rate [1] 3.71% 3.71%
Total FHLB Borrowings    
FHLB borrowings    
Weighted average contractual rate [1] 2.09% 4.04%
Total FHLB Borrowings | Short-term advances    
FHLB borrowings    
Advances [1] 0.40%  
Total FHLB Borrowings | Long-term advances    
FHLB borrowings    
Advances [1] 4.04% 4.04%
[1] Weighted average contractual rate