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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, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | $ 166,450 | $ 372,389
Fair Value | $ 165,579 | $ 366,173
Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 100.00% | 100.00%
Available for sale, Amortized Cost | $ 111,659 | $ 125,070
Unrealized Gains | (2,258) | 4,158
Unrealized Losses | (586) | 357
Fair Value | $ 113,331 | $ 128,871
New York | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 11.66% | 11.38%
Available for sale, Amortized Cost | $ 12,876 | $ 14,062
Unrealized Gains | (334) | 602
Fair Value | $ 13,210 | $ 14,664
Minnesota | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 9.70% | 8.69%
Available for sale, Amortized Cost | $ 10,796 | $ 10,797
Unrealized Gains | (232) | 420
Unrealized Losses | (40) | 14
Fair Value | $ 10,988 | $ 11,203
Wisconsin | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.66% | 7.76%
Available for sale, Amortized Cost | $ 9,786 | $ 9,786
Unrealized Gains | (74) | 217
Unrealized Losses | (42) | 5
Fair Value | $ 9,818 | $ 9,998
Ohio | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.50% | 8.72%
Available for sale, Amortized Cost | $ 9,599 | $ 11,011
Unrealized Gains | (125) | 283
Unrealized Losses | (88) | 64
Fair Value | $ 9,636 | $ 11,230
Massachusetts | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 8.45% | 7.69%
Available for sale, Amortized Cost | $ 9,355 | $ 9,554
Unrealized Gains | (229) | 378
Unrealized Losses | (10) | 22
Fair Value | $ 9,574 | $ 9,910
New Jersey | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 7.14% | 8.38%
Available for sale, Amortized Cost | $ 7,891 | $ 10,416
Unrealized Gains | (202) | 388
Fair Value | $ 8,093 | $ 10,804
Connecticut | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 6.90% | 7.60%
Available for sale, Amortized Cost | $ 7,628 | $ 9,479
Unrealized Gains | (190) | 315
Fair Value | $ 7,818 | $ 9,794
Texas | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 6.55% | 6.04%
Available for sale, Amortized Cost | $ 7,397 | $ 7,651
Unrealized Gains | (130) | 208
Unrealized Losses | (103) | 75
Fair Value | $ 7,424 | $ 7,784
IOWA | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 5.66% | 5.03%
Available for sale, Amortized Cost | $ 6,467 | $ 6,471
Unrealized Gains | (36) | 75
Unrealized Losses | (88) | 60
Fair Value | $ 6,415 | $ 6,486
Other | Municipal Securities by State |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Percent of Municipal Portfolio | 26.78% | 28.71%
Available for sale, Amortized Cost | $ 29,864 | $ 35,843
Unrealized Gains | (706) | 1,272
Unrealized Losses | (215) | 117
Fair Value | $ 30,355 | $ 36,998

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