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Investment Securities (Detail) - Collateralized Debt Obligations at March 31, 2013 (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OTTI $ 268 $ 69
Collateralized Debt Obligations [Member] | Performing Classified [Member] | ALESCO I [Member]
    
Dollar Basis 83.93%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | ALESCO II [Member]
    
Dollar Basis 91.94%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | MCAP III [Member]
    
Dollar Basis 70.00%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | MCAP IX [Member]
    
Dollar Basis 56.62%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | PRETZL IV [Member]
    
Dollar Basis 71.00%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | PRETZL XI [Member]
    
Dollar Basis 72.93%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | PRETZL XII [Member]
    
Dollar Basis 51.08%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | PRETZL XIII [Member]
    
Dollar Basis 68.21%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | PRETZL XIV [Member]
    
Dollar Basis 67.45%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | TRPREF II [Member]
    
Dollar Basis 67.54%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | USCAP II [Member]
    
Dollar Basis 63.97%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | USCAP III [Member]
    
Dollar Basis 56.46%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | MCAP XVIII [Member]
    
Dollar Basis 80.46%  
Collateralized Debt Obligations [Member] | Performing Classified [Member] | PRETZL VII [Member]
    
Dollar Basis 70.73%  
Collateralized Debt Obligations [Member] | Performing Classified [Member]
    
Dollar Basis 68.74%  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | ALESCO I [Member]
    
Dollar Basis 16.07% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | ALESCO II [Member]
    
Dollar Basis 8.06% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | MCAP III [Member]
    
Dollar Basis 30.00% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | MCAP IX [Member]
    
Dollar Basis 43.38% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | PRETZL IV [Member]
    
Dollar Basis 29.00% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | PRETZL XI [Member]
    
Dollar Basis 27.07% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | PRETZL XII [Member]
    
Dollar Basis 48.92% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | PRETZL XIII [Member]
    
Dollar Basis 31.79% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | PRETZL XIV [Member]
    
Dollar Basis 32.55% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | TRPREF II [Member]
    
Dollar Basis 32.46% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | USCAP II [Member]
    
Dollar Basis 36.03% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | USCAP III [Member]
    
Dollar Basis 43.54% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | MCAP XVIII [Member]
    
Dollar Basis 19.54% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member] | PRETZL VII [Member]
    
Dollar Basis 29.27% [1]  
Collateralized Debt Obligations [Member] | Default Percentage [Member]
    
Dollar Basis 31.26% [1]  
Collateralized Debt Obligations [Member] | ALESCO I [Member] | Maximum [Member]
    
Constant Default Rate 0.76%  
Collateralized Debt Obligations [Member] | ALESCO I [Member] | Minimum [Member]
    
Constant Default Rate 0.39%  
Collateralized Debt Obligations [Member] | ALESCO I [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | ALESCO I [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | ALESCO I [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 520  
Fair Value 327  
Unrealized Loss (Gain) 193  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.70% [3]  
Collateralized Debt Obligations [Member] | ALESCO II [Member] | Maximum [Member]
    
Constant Default Rate 0.70%  
Collateralized Debt Obligations [Member] | ALESCO II [Member] | Minimum [Member]
    
Constant Default Rate 0.36%  
Collateralized Debt Obligations [Member] | ALESCO II [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | ALESCO II [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | ALESCO II [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 345  
Fair Value 320  
Unrealized Loss (Gain) 25  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.65% [3]  
Collateralized Debt Obligations [Member] | MCAP III [Member] | Maximum [Member]
    
Constant Default Rate 0.69%  
Collateralized Debt Obligations [Member] | MCAP III [Member] | Minimum [Member]
    
Constant Default Rate 0.35%  
Collateralized Debt Obligations [Member] | MCAP III [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | MCAP III [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | MCAP III [Member]
    
Single/Pooled Pooled  
Class/Tranche B  
Amortized Cost 276  
Fair Value 152  
Unrealized Loss (Gain) 124  
OTTI 0 [2]  
Lowest Rating B  
Discount Margin 10.50% [3]  
Collateralized Debt Obligations [Member] | MCAP IX [Member] | Maximum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | MCAP IX [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | MCAP IX [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | MCAP IX [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | MCAP IX [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 267  
Fair Value 157  
Unrealized Loss (Gain) 110  
OTTI 0 [2]  
Lowest Rating CC  
Discount Margin 16.80% [3]  
Collateralized Debt Obligations [Member] | PRETZL IV [Member] | Maximum [Member]
    
Constant Default Rate 0.33%  
Collateralized Debt Obligations [Member] | PRETZL IV [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL IV [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL IV [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL IV [Member]
    
Single/Pooled Pooled  
Class/Tranche MEZ  
Amortized Cost 116  
Fair Value 56  
Unrealized Loss (Gain) 60  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.05% [3]  
Collateralized Debt Obligations [Member] | PRETZL XI [Member] | Maximum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL XI [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL XI [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XI [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XI [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 821  
Fair Value 306  
Unrealized Loss (Gain) 515  
OTTI 0 [2]  
Lowest Rating CCC  
Discount Margin 11.00% [3]  
Collateralized Debt Obligations [Member] | PRETZL XII [Member] | Maximum [Member]
    
Constant Default Rate 0.84%  
Collateralized Debt Obligations [Member] | PRETZL XII [Member] | Minimum [Member]
    
Constant Default Rate 0.43%  
Collateralized Debt Obligations [Member] | PRETZL XII [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XII [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XII [Member]
    
Single/Pooled Pooled  
Class/Tranche B-2  
Amortized Cost 499  
Fair Value 315  
Unrealized Loss (Gain) 184  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 16.80% [3]  
Collateralized Debt Obligations [Member] | PRETZL XIII [Member] | Maximum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL XIII [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL XIII [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XIII [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XIII [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 325  
Fair Value 189  
Unrealized Loss (Gain) 136  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.60% [3]  
Collateralized Debt Obligations [Member] | PRETZL XIV [Member] | Maximum [Member]
    
Constant Default Rate 0.39%  
Collateralized Debt Obligations [Member] | PRETZL XIV [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL XIV [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XIV [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL XIV [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 634  
Fair Value 369  
Unrealized Loss (Gain) 265  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.62% [3]  
Collateralized Debt Obligations [Member] | TRPREF II [Member] | Maximum [Member]
    
Constant Default Rate 0.60%  
Collateralized Debt Obligations [Member] | TRPREF II [Member] | Minimum [Member]
    
Constant Default Rate 0.31%  
Collateralized Debt Obligations [Member] | TRPREF II [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | TRPREF II [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | TRPREF II [Member]
    
Single/Pooled Pooled  
Class/Tranche B  
Amortized Cost 635  
Fair Value 261  
Unrealized Loss (Gain) 374  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.57% [3]  
Collateralized Debt Obligations [Member] | USCAP II [Member] | Maximum [Member]
    
Constant Default Rate 0.36%  
Collateralized Debt Obligations [Member] | USCAP II [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | USCAP II [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | USCAP II [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | USCAP II [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 947  
Fair Value 303  
Unrealized Loss (Gain) 644  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.57% [3]  
Collateralized Debt Obligations [Member] | USCAP III [Member] | Maximum [Member]
    
Constant Default Rate 0.36%  
Collateralized Debt Obligations [Member] | USCAP III [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | USCAP III [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | USCAP III [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | USCAP III [Member]
    
Single/Pooled Pooled  
Class/Tranche B-1  
Amortized Cost 297  
Fair Value 249  
Unrealized Loss (Gain) 48  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.92% [3]  
Collateralized Debt Obligations [Member] | MCAP XVIII [Member] | Maximum [Member]
    
Constant Default Rate 0.43%  
Collateralized Debt Obligations [Member] | MCAP XVIII [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | MCAP XVIII [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | MCAP XVIII [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | MCAP XVIII [Member]
    
Single/Pooled Pooled  
Class/Tranche C-1  
Amortized Cost 174  
Fair Value 220  
Unrealized Loss (Gain) (46)  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.65% [3]  
Collateralized Debt Obligations [Member] | PRETZL VII [Member] | Maximum [Member]
    
Constant Default Rate 0.31%  
Collateralized Debt Obligations [Member] | PRETZL VII [Member] | Minimum [Member]
    
Constant Default Rate 0.25%  
Collateralized Debt Obligations [Member] | PRETZL VII [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL VII [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | PRETZL VII [Member]
    
Single/Pooled Pooled  
Class/Tranche MEZ  
Amortized Cost 250  
Fair Value 280  
Unrealized Loss (Gain) (30)  
OTTI 0 [2]  
Lowest Rating C  
Discount Margin 11.53% [3]  
Collateralized Debt Obligations [Member] | CDOs In A Loss Position [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | CDOs In A Loss Position [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | CDOs In A Loss Position [Member]
    
Amortized Cost 5,682  
Fair Value 3,004  
Unrealized Loss (Gain) 2,678  
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member] | Other Than Credit Portion [Member]
    
OTTI 0 [2]  
Collateralized Debt Obligations [Member]
    
Amortized Cost 6,106  
Fair Value 3,504  
Unrealized Loss (Gain) 2,602  
OTTI $ 0 [2]  
[1] Represents percentage of the underlying trust preferred collateral not currently making dividend payments or issued by financial institutions that have been placed into receivership by the FDIC
[2] Recognized in other-than-temporary impairment on investment securities on the Consolidated Statements of Income
[3] Fair market value discount margin to LIBOR