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Repurchase Agreements - Summary of Repurchase Agreements Accounted as Secured Borrowings (Detail)
$ in Thousands
Jun. 30, 2015
USD ($)
Repurchase Agreement [Line Items]  
Repurchase Agreements - Long-term $ 152,731
Securities lending transactions, Total 165,691
Total borrowings (12,960)
Gross amount of recognized liabilities for repurchase agreements and securities lending 152,731
U.S. Treasury and Federal Agencies [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 8,468
Federal Agency Collateralized Mortgage Obligations [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 96,071
Federal Agency Mortgage Backed Pools [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 61,151
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member]  
Repurchase Agreement [Line Items]  
Repurchase Agreements - Long-term 57,731
Securities lending transactions, Total 60,168
Total borrowings (2,437)
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | U.S. Treasury and Federal Agencies [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 8,468
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 41,140
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Mortgage Backed Pools [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 10,560
Remaining Contractual Maturity of the Agreements, One to Three Years [Member]  
Repurchase Agreement [Line Items]  
Repurchase Agreements - Long-term 35,000
Securities lending transactions, Total 87
Total borrowings 34,913
Remaining Contractual Maturity of the Agreements, One to Three Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 87
Remaining Contractual Maturity of the Agreements, Three to Five Years [Member]  
Repurchase Agreement [Line Items]  
Repurchase Agreements - Long-term 50,000
Securities lending transactions, Total 1,561
Total borrowings 48,439
Remaining Contractual Maturity of the Agreements, Three to Five Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 1,020
Remaining Contractual Maturity of the Agreements, Three to Five Years [Member] | Federal Agency Mortgage Backed Pools [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 541
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member]  
Repurchase Agreement [Line Items]  
Repurchase Agreements - Long-term 10,000
Securities lending transactions, Total 15,987
Total borrowings (5,987)
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 7,413
Remaining Contractual Maturity of the Agreements, Five to Ten Years [Member] | Federal Agency Mortgage Backed Pools [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 8,574
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 87,888
Total borrowings (87,888)
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member] | Federal Agency Collateralized Mortgage Obligations [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total 46,412
Remaining Contractual Maturity of the Agreements, Beyond Ten Years [Member] | Federal Agency Mortgage Backed Pools [Member]  
Repurchase Agreement [Line Items]  
Securities lending transactions, Total $ 41,476