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Impairment of Investment Securities - Additional Information (Detail) (USD $) | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended |  |  | 3 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |
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Sep. 30, 2014 Security Rate Bank | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Dec. 31, 2013 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Sep. 30, 2014 Trust preferred collateralized debt obligations [Member] | Sep. 30, 2013 Trust preferred collateralized debt obligations [Member] | Sep. 30, 2014 Corporate Debt Securities [Member] | Dec. 31, 2013 Corporate Debt Securities [Member] | Sep. 30, 2014 Pooled Trust Preferred Securities [Member] | Sep. 30, 2013 Pooled Trust Preferred Securities [Member] | Sep. 30, 2014 Equity Securities [Member] | Sep. 30, 2013 Equity Securities [Member] | Dec. 31, 2013 Equity Securities [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 1 [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 2 [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 3 [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 3 [Member] Minimum [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 3 [Member] Maximum [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 4 [Member] | Sep. 30, 2014 Asset Size and Coupon Rate 5 [Member] | Sep. 30, 2014 Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] | Sep. 30, 2014 Reported Value Measurement [Member] | Dec. 31, 2013 Reported Value Measurement [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment charges recognized | $ 0 | $ 0 |  |  |  |  |  | $ 0 | $ 0 |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Percent of unrealized losses |  |  |  |  |  | 42.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58.00% |  |
Continuous Unrealized Loss Position, Fair Value | 974,477,000 |  | 931,156,000 |  |  | 24,957,000 | 23,523,000 |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | 1,348,063,000 |  | 1,350,466,000 |  |  | 41,971,000 | 42,040,000 |  |  | 6,685,000 | 6,693,000 |  |  | 1,420,000 |  | 1,420,000 |  |  |  |  |  |  |  |  |  |
Securities available for sale, at fair value | 1,332,774,000 |  | 1,318,365,000 |  |  | 29,456,000 | 23,523,000 |  |  | 7,286,000 | 7,021,000 |  |  | 1,420,000 |  | 1,420,000 |  |  |  |  |  |  |  |  | 1,332,774,000 | 1,318,365,000
Number of banks and other financial institutions comprising the security | 282 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Pooled Securities with No Senior Class | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated tranches range |  |  |  | 7.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal amount of the respective securities |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of securities with no excess subordination | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Securities with Excess Subordination | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess subordination as a percentage of current performing collateral |  |  |  | 2.00% | 43.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral issued by financial institutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000,000 |  |  | 2,000,000,000 | 15,000,000,000 | 2,000,000,000 |  |  |  |
Coupon rate | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |  | 10.00% |  |  |  |
Prepayment rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 5.00% |  |  | 5.00% | 0.00% |  |  |
Fair Value Inputs , Prepayment Rate Year One and Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |
Fair Value Inputs , Prepayment Rate After Year Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probabilities for performing collateral range |  |  |  | 0.33% | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Current Performing Collateral |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess present value of future cash flows over our current book value |  |  |  | 22.00% | 154.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ 50,994,000 |  | $ 35,444,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,994,000 | $ 35,444,000
Percentage of Excess Stock to be Purchased | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage Of Stock To Be Purchased | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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