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Impairment of Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 Security Rate Bank | Mar. 31, 2013 | Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Other than temporary impairment charges recognized | $ 0 | $ 0 |
Continuous Unrealized Loss Position, Fair Value | 903,067,000 |  | 931,156,000
Amortized Cost | 1,370,681,000 |  | 1,350,466,000
Securities available for sale, at fair value | 1,351,039,000 |  | 1,318,365,000
Number of banks and other financial institutions comprising the security | 288 |  |
Number Of Pooled Securities with No Senior Class | 4 |  |
Number of securities with no excess subordination | 5 |  |
Number of Securities with Excess Subordination | 5 |  |
Coupon rate | 7.00% |  |
Probability of default | 100.00% |  |
Projected recovery rate | 0.00% |  |
Probability percentage assigned to default bank subject to market indicators | 10.00% |  |
Probability percentage assigned to default bank | 100.00% |  |
Federal Home Loan Bank Stock | 34,047,000 |  | 35,444,000
Percentage of Excess Stock to be Purchased | 100.00% |  |
Maximum Percentage Of Stock To Be Purchased | 5.00% |  |
Proceeds from Sale of Federal Reserve Bank Stock | 7,976,000 | 2,756,000 |
Minimum [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Subordinated tranches range | 7.00% |  |
Total principal amount of the respective securities | 5.00% |  |
Excess subordination as a percentage of current performing collateral | 8.00% |  |
Probabilities for performing collateral range | 0.33% |  |
Excess present value of future cash flows over our current book value | 18.00% |  |
Maximum [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Subordinated tranches range | 35.00% |  |
Excess subordination as a percentage of current performing collateral | 56.00% |  |
Probabilities for performing collateral range | 75.00% |  |
Excess present value of future cash flows over our current book value | 155.00% |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Percent of unrealized losses | 40.00% |  |
Continuous Unrealized Loss Position, Fair Value | 27,877,000 |  | 23,523,000
Amortized Cost | 42,214,000 |  | 42,040,000
Securities available for sale, at fair value | 27,876,000 |  | 23,523,000
Trust preferred collateralized debt obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Other than temporary impairment charges recognized | 0 | 0 |
Percentage of Current Performing Collateral | 0.00% |  |
Corporate Debt Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost | 6,691,000 |  | 6,693,000
Securities available for sale, at fair value | 7,128,000 |  | 7,021,000
Pooled Trust Preferred Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Other than temporary impairment charges recognized | 0 | 0 |
Equity Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Other than temporary impairment charges recognized | 0 | 0 |
Continuous Unrealized Loss Position, Fair Value | 0 | 0 |
Amortized Cost | 1,420,000 |  | 1,420,000
Securities available for sale, at fair value | 1,420,000 |  | 1,420,000
Asset Size and Coupon Rate 1 [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Collateral issued by financial institutions | 15,000,000,000 |  |
Prepayment rate | 100.00% |  |
Coupon rate | 7.00% |  |
Asset Size and Coupon Rate 2 [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Coupon rate | 7.00% |  |
Fair Value Inputs , Prepayment Rate Year One and Two | 40.00% |  |
Fair Value Inputs , Prepayment Rate After Year Two | 2.00% |  |
Asset Size and Coupon Rate 3 [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Prepayment rate | 5.00% |  |
Asset Size and Coupon Rate 3 [Member] | Minimum [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Collateral issued by financial institutions | 2,000,000,000 |  |
Asset Size and Coupon Rate 3 [Member] | Maximum [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Collateral issued by financial institutions | 15,000,000,000 |  |
Asset Size and Coupon Rate 4 [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Collateral issued by financial institutions | 2,000,000,000 |  |
Prepayment rate | 5.00% |  |
Coupon rate | 10.00% |  |
Asset Size and Coupon Rate 5 [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Prepayment rate | 0.00% |  |
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Percent of unrealized losses | 60.00% |  |
Reported Value Measurement [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Securities available for sale, at fair value | 1,351,039,000 |  | 1,318,365,000
Federal Home Loan Bank Stock | $ 34,047,000 |  | $ 35,444,000

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