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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
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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

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