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Balance Sheet Offsetting - Financial Instruments Derivative Assets Liabilities and Resell Agreements Net of Amount Not Offset (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Net Amount Recognized, Derivatives, Financial Assets $ 16,036 $ 29,921
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets (14,140) (20,436)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets (1,426) (6,035)
Net Amount, Derivatives, Financial Assets 470 3,450
Net Amount Recognized, Resell agreements 13,642 9,642
Gross Amounts Not Offset Financial Instruments, Resell Agreements 0 0
Gross Amounts Not Offset Collateral, Resell Agreements, Financial Assets (13,642) (9,642)
Net Amount, Financial Assets, Resell Agreements 0 0
Net Amount Recognized, Total Financial Assets 29,678 39,563
Gross Amounts Not Offset Collateral, Financial Assets (15,068) (15,677)
Net Amount, Financial Assets 470 3,450
Net Amount Recognized, Derivatives, Financial Liabilities 52,291 47,898
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities (14,140) (20,436)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities (37,144) (26,307)
Net Amount, Derivatives, Financial Liabilities 1,007 1,155
Net Amount Recognized, Repurchase Agreements, Financial Liabilities 618,504 791,119
Gross Amounts Not Offset Financial Instruments, Repurchase Agreements, Financial Liabilities 0 0
Gross Amounts Not Offset Collateral, Repurchase Agreements, Financial Liabilities (618,504) (791,119)
Net Amount, Repurchase Agreements, Financial Liabilities 0 0
Net Amount Recognized, Financial Liabilities 670,795 839,017
Gross Amounts Not Offset Collateral, Financial Liabilities (655,648) (817,426)
Net Amount, Financial Liabilities 1,007 1,155
Counterparty A [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Net Amount Recognized, Derivatives, Financial Assets 593 627
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets (593) (627)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets 0 0
Net Amount, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivatives, Financial Liabilities 19,368 18,653
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities (593) (627)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities (18,611) (17,626)
Net Amount, Derivatives, Financial Liabilities 164 400
Counterparty B [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Net Amount Recognized, Derivatives, Financial Assets 10,048 17,308
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets (8,383) (9,506)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets (1,196) (4,925)
Net Amount, Derivatives, Financial Assets 469 2,877
Net Amount Recognized, Derivatives, Financial Liabilities 8,383 9,506
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities (8,383) (9,506)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities 0 0
Net Amount, Derivatives, Financial Liabilities 0 0
Counterparty C [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Net Amount Recognized, Derivatives, Financial Assets 3,925 7,991
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets (3,925) (7,539)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets 0 0
Net Amount, Derivatives, Financial Assets 0 452
Net Amount Recognized, Derivatives, Financial Liabilities 4,522 7,539
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities (3,925) (7,539)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities (597) 0
Net Amount, Derivatives, Financial Liabilities 0 0
Other Counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Net Amount Recognized, Derivatives, Financial Assets 1,470 3,995
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets (1,239) (2,764)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets (230) (1,110)
Net Amount, Derivatives, Financial Assets 1 121
Net Amount Recognized, Derivatives, Financial Liabilities 20,018 12,200
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities (1,239) (2,764)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities (17,936) (8,681)
Net Amount, Derivatives, Financial Liabilities $ 843 $ 755