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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
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