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Repurchase Agreements - Summary of Repurchase Agreements Accounted as Secured Borrowings (Detail)
$ in Thousands
Sep. 30, 2016
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements $ 157,703
Securities lending transactions, Total 173,891
Total borrowings (16,188)
Gross amount of recognized liabilities for repurchase agreements and securities lending 157,703
U.S. Treasury and Federal Agencies [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 4,025
Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 102,964
Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 66,902
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements 62,703
Securities lending transactions, Total 68,781
Total borrowings (6,078)
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | U.S. Treasury and Federal Agencies [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 4,025
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 50,255
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 14,501
Remaining Contractual Maturity of the Agreements, Up to One Year [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements 35,000
Total borrowings 35,000
Remaining Contractual Maturity of the Agreements, One to Three Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements 50,000
Securities lending transactions, Total 405
Total borrowings 49,595
Remaining Contractual Maturity of the Agreements, One to Three Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 316
Remaining Contractual Maturity of the Agreements, One to Three Years [Member] | Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 89
Remaining Contractual Maturity of the Agreements, Three to Five Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements 10,000
Securities lending transactions, Total 2,404
Total borrowings 7,596
Remaining Contractual Maturity of the Agreements, Three to Five Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 258
Remaining Contractual Maturity of the Agreements, Three to Five Years [Member] | Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 2,146
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 42,292
Total borrowings (42,292)
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 21,514
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member] | Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 20,778
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 60,009
Total borrowings (60,009)
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 30,621
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member] | Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total $ 29,388