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Amortized Cost and Fair Value of Municipal Securities by State, Including Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 372,389 | $ 332,942
Fair Value | $ 366,173 | $ 326,117
Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 100.00% | 108.09%
Amortized Cost | $ 125,070 | $ 135,163
Unrealized Gains | (4,158) | 4,830
Unrealized Losses | (357) | 692
Fair Value | $ 128,871 | $ 139,301
New York | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 11.38% | 11.48%
Amortized Cost | $ 14,062 | $ 14,064
Unrealized Gains | (602) | 730
Fair Value | $ 14,664 | $ 14,794
Minnesota | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.69% | 9.02%
Amortized Cost | $ 10,797 | $ 11,188
Unrealized Gains | (420) | 463
Unrealized Losses | (14) | 30
Fair Value | $ 11,203 | $ 11,621
New Jersey | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.38% | 8.60%
Amortized Cost | $ 10,416 | $ 10,567
Unrealized Gains | (388) | 515
Fair Value | $ 10,804 | $ 11,082
Connecticut | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 7.60% | 8.67%
Amortized Cost | $ 9,479 | $ 10,775
Unrealized Gains | (315) | 393
Fair Value | $ 9,794 | $ 11,168
Wisconsin | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 7.76% | 8.98%
Amortized Cost | $ 9,786 | $ 11,340
Unrealized Gains | (217) | 244
Unrealized Losses | (5) | 16
Fair Value | $ 9,998 | $ 11,568
Ohio | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.72% | 8.79%
Amortized Cost | $ 11,011 | $ 11,145
Unrealized Gains | (283) | 337
Unrealized Losses | (64) | 148
Fair Value | $ 11,230 | $ 11,334
Massachusetts | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 7.69% | 7.77%
Amortized Cost | $ 9,554 | $ 9,653
Unrealized Gains | (378) | 393
Unrealized Losses | (22) | 38
Fair Value | $ 9,910 | $ 10,008
Texas | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 6.04% | 6.87%
Amortized Cost | $ 7,651 | $ 8,770
Unrealized Gains | (208) | 214
Unrealized Losses | (75) | 133
Fair Value | $ 7,784 | $ 8,851
IOWA | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 5.03% |
Amortized Cost | $ 6,471 |
Unrealized Gains | (75) |
Unrealized Losses | (60) |
Fair Value | $ 6,486 |
Other | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 28.71% | 37.93%
Amortized Cost | $ 35,843 | $ 47,661
Unrealized Gains | (1,272) | 1,541
Unrealized Losses | (117) | 327
Fair Value | $ 36,998 | $ 48,875

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