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Repurchase Agreements - Summary of Repurchase Agreements Accounted as Secured Borrowings (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements $ 150,768
Securities lending transactions, Total 171,018
Total borrowings (20,250)
U.S. Treasury and Federal Agencies [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 4,024
Federal Agency Collateralized Mortgage Obligations [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 102,034
Federal Agency Mortgage-backed Pools [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 64,960
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements 55,768
Securities lending transactions, Total 64,678
Total borrowings (8,910)
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 4,024
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 47,004
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 13,650
Remaining Contractual Maturity of the Agreements, One to Three Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Repurchase Agreements 85,000
Securities lending transactions, Total 607
Total borrowings 84,393
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 467
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 140
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 1,682
Total borrowings 8,318
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 192
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 1,490
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 42,642
Total borrowings (42,642)
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 22,365
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 20,277
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Securities lending transactions, Total 61,409
Total borrowings (61,409)
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 32,006
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 $ 29,403