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Amortized Cost and Fair Value of Municipal Securities by State, Including Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 568 $ 816
Unrealized Gains 11 16
Unrealized Losses      
Fair Value 579 832
Amortized Cost 541,642 534,810
Unrealized Gains 4,467 14,408
Unrealized Losses (26,289) (14,860)
Fair Value 519,820 534,358
Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 100.00% 100.00%
Amortized Cost 147,617 151,935
Unrealized Gains 1,879 8,211
Unrealized Losses (4,637) (97)
Fair Value 144,859 160,049
New York | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 11.34% 11.04%
Amortized Cost 16,161 16,552
Unrealized Gains 294 1,114
Unrealized Losses (28)  
Fair Value 16,427 17,666
Wisconsin | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 7.83% 8.66%
Amortized Cost 11,815 13,266
Unrealized Gains 118 602
Unrealized Losses (584)  
Fair Value 11,349 13,868
Minnesota | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 8.56% 8.61%
Amortized Cost 12,504 12,990
Unrealized Gains 174 798
Unrealized Losses (279) (4)
Fair Value 12,399 13,784
New Jersey | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 8.18% 8.01%
Amortized Cost 11,565 11,940
Unrealized Gains 306 874
Unrealized Losses (25)  
Fair Value 11,846 12,814
Connecticut | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 7.86% 7.72%
Amortized Cost 11,406 11,693
Unrealized Gains 91 660
Unrealized Losses (109)  
Fair Value 11,388 12,353
Texas | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 6.24% 7.42%
Amortized Cost 9,483 11,416
Unrealized Gains 134 470
Unrealized Losses (576) (16)
Fair Value 9,041 11,870
Ohio | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 7.45% 7.31%
Amortized Cost 11,299 11,147
Unrealized Gains 135 575
Unrealized Losses (637) (21)
Fair Value 10,797 11,701
Massachusetts | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 6.85% 6.98%
Amortized Cost 10,102 10,531
Unrealized Gains 119 642
Unrealized Losses (295) (3)
Fair Value 9,926 11,170
Other | Municipal Securities by State
    
Schedule of Held-to-maturity Securities [Line Items]    
Percent of Municipal Portfolio 35.68% 34.25%
Amortized Cost 53,282 52,400
Unrealized Gains 508 2,476
Unrealized Losses (2,104) (53)
Fair Value 51,686 54,823
Municipal securities
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 568 816
Unrealized Gains 11 16
Unrealized Losses      
Fair Value $ 579 $ 832