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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase - Schedule of Remaining Contractual Maturity in Repurchase Agreements (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase agreements, Remaining contractual maturity of the agreements $ 61,500
US Treasury & Agency Securities [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase agreements, Remaining contractual maturity of the agreements 61,504
Overnight & Continuous [Member] | US Treasury & Agency Securities [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase agreements, Remaining contractual maturity of the agreements 44,465
Greater Than 90 Days [Member] | US Treasury & Agency Securities [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase agreements, Remaining contractual maturity of the agreements $ 17,039