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Composition of Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Federal funds purchased $ 0   $ 0
Securities sold under agreements to repurchase:      
Securities sold under agreements to repurchase 124,076   121,742
FHLB borrowings 65,000   90,000
Subordinated debt 15,464   15,464
Other debt 491   2,535
Total borrowings $ 205,031   $ 229,741
Federal funds purchased [1]     0.34%
Retail [1] 0.10%   0.13%
Wholesale Repurchase Agreements      
Securities sold under agreements to repurchase:      
Weighted average contractual rate [1] 3.71%   3.71%
FHLB Borrowings      
Securities sold under agreements to repurchase:      
FHLB borrowings   $ 25,000  
Weighted average contractual rate [1] 4.04%   4.07%
Retail      
Securities sold under agreements to repurchase:      
Securities sold under agreements to repurchase $ 74,076   $ 71,742
Wholesale      
Securities sold under agreements to repurchase:      
Securities sold under agreements to repurchase $ 50,000   $ 50,000
[1] Weighted average contractual rate