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Loans - Presentation of Loans Individually Evaluated for Impairment by Class (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance $ 23,413 $ 19,838 $ 23,413 $ 19,838 $ 24,403
With no specific allowance recorded, Recorded Investment 11,613 10,003 11,613 10,003 12,340
With no specific allowance recorded, Average Recorded Investment 12,239 11,447 12,282 13,177  
With no specific allowance recorded, Interest Income Recognized 30 33 84 83  
With no specific allowance recorded, Cash Basis Income Recognized 30 30 78 75  
With a specific allowance recorded, Unpaid Principal Balance 31,204 31,778 31,204 31,778 27,499
With a specific allowance recorded, Recorded Investment 28,640 29,110 28,640 29,110 27,319
With a specific allowance recorded, Allowance for Loan Losses Allocated 2,874 2,970 2,874 2,970 2,816
With a specific allowance recorded, Average Recorded Investment 28,704 30,040 28,757 30,491  
With a specific allowance recorded, Interest Income Recognized 301 316 914 951  
With a specific allowance recorded, Cash Basis Income Recognized 295 308 840 868  
Total Unpaid Principal Balance 54,617 51,616 54,617 51,616 51,902
Total Recorded Investment 40,253 39,113 40,253 39,113 39,659
Total Average Recorded Investment 40,943 41,487 41,039 43,668  
Total Interest Income Recognized 331 349 998 1,034  
Total Cash Basis Income Recognized 325 338 918 943  
Commercial Loans [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 13,091 12,135 13,091 12,135 13,911
With no specific allowance recorded, Recorded Investment 3,983 4,553 3,983 4,553 4,390
With no specific allowance recorded, Average Recorded Investment 4,197 5,634 4,270 7,079  
With no specific allowance recorded, Interest Income Recognized 1 2 11 9  
With no specific allowance recorded, Cash Basis Income Recognized 1 2 11 9  
With a specific allowance recorded, Unpaid Principal Balance 12,276 8,463 12,276 8,463 5,488
With a specific allowance recorded, Recorded Investment 9,714 5,795 9,714 5,795 5,308
With a specific allowance recorded, Allowance for Loan Losses Allocated 1,016 629 1,016 629 568
With a specific allowance recorded, Average Recorded Investment 9,610 6,337 8,603 6,245  
With a specific allowance recorded, Interest Income Recognized 84 26 208 101  
With a specific allowance recorded, Cash Basis Income Recognized 84 26 206 99  
Commercial Loans [Member] | Multifamily [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 59 169 59 169 165
With no specific allowance recorded, Average Recorded Investment       43  
With no specific allowance recorded, Interest Income Recognized   1   4  
With no specific allowance recorded, Cash Basis Income Recognized   1   4  
With a specific allowance recorded, Average Recorded Investment   43   23  
Commercial Loans [Member] | Nonresidential [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 952 1,780 952 1,780 1,215
With no specific allowance recorded, Recorded Investment 149 369 149 369 306
With no specific allowance recorded, Average Recorded Investment 238 1,400 248 2,708  
With no specific allowance recorded, Interest Income Recognized 1 1 4 5  
With no specific allowance recorded, Cash Basis Income Recognized 1 1 4 5  
With a specific allowance recorded, Unpaid Principal Balance 11,660 5,324 11,660 5,324 5,164
With a specific allowance recorded, Recorded Investment 9,164 5,144 9,164 5,144 4,984
With a specific allowance recorded, Allowance for Loan Losses Allocated 935 584 935 584 565
With a specific allowance recorded, Average Recorded Investment 8,868 5,643 7,911 5,303  
With a specific allowance recorded, Interest Income Recognized 84 26 208 101  
With a specific allowance recorded, Cash Basis Income Recognized 84 26 206 99  
Commercial Loans [Member] | Land [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 3,922 3,922 3,922 3,922 3,922
With no specific allowance recorded, Recorded Investment 134 484 134 484 384
With no specific allowance recorded, Average Recorded Investment 259 490 322 511  
Commercial Loans [Member] | Construction [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 3,594 1,126 3,594 1,126 3,593
With no specific allowance recorded, Average Recorded Investment   44   116  
With a specific allowance recorded, Unpaid Principal Balance   2,815   2,815  
With a specific allowance recorded, Recorded Investment   327   327  
With a specific allowance recorded, Allowance for Loan Losses Allocated   42   42  
With a specific allowance recorded, Average Recorded Investment   327   595  
Commercial Loans [Member] | Secured [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 3,743 3,890 3,743 3,890 3,884
With no specific allowance recorded, Recorded Investment 3,700 3,700 3,700 3,700 3,700
With no specific allowance recorded, Average Recorded Investment 3,700 3,700 3,700 3,701  
With a specific allowance recorded, Unpaid Principal Balance 616 324 616 324 324
With a specific allowance recorded, Recorded Investment 550 324 550 324 324
With a specific allowance recorded, Allowance for Loan Losses Allocated 81 3 81 3 3
With a specific allowance recorded, Average Recorded Investment 742 324 692 324  
Commercial Loans [Member] | Unsecured [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 821 1,248 821 1,248 1,132
With no specific allowance recorded, Interest Income Recognized     7    
With no specific allowance recorded, Cash Basis Income Recognized     7    
Residential Mortgage Loans [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 7,401 5,374 7,401 5,374 7,607
With no specific allowance recorded, Recorded Investment 5,727 3,914 5,727 3,914 5,866
With no specific allowance recorded, Average Recorded Investment 6,125 4,163 6,049 4,373  
With no specific allowance recorded, Interest Income Recognized 19 26 55 56  
With no specific allowance recorded, Cash Basis Income Recognized 19 24 49 50  
With a specific allowance recorded, Unpaid Principal Balance 12,123 14,390 12,123 14,390 13,482
With a specific allowance recorded, Recorded Investment 12,121 14,390 12,121 14,390 13,482
With a specific allowance recorded, Allowance for Loan Losses Allocated 1,342 1,596 1,342 1,596 1,541
With a specific allowance recorded, Average Recorded Investment 12,077 14,609 12,587 14,626  
With a specific allowance recorded, Interest Income Recognized 132 173 423 497  
With a specific allowance recorded, Cash Basis Income Recognized 127 166 373 439  
Residential Mortgage Loans [Member] | One-to Four-Family [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 7,401 5,374 7,401 5,374 7,607
With no specific allowance recorded, Recorded Investment 5,727 3,914 5,727 3,914 5,866
With no specific allowance recorded, Average Recorded Investment 6,125 4,163 6,049 4,373  
With no specific allowance recorded, Interest Income Recognized 19 26 55 56  
With no specific allowance recorded, Cash Basis Income Recognized 19 24 49 50  
With a specific allowance recorded, Unpaid Principal Balance 12,123 14,390 12,123 14,390 13,482
With a specific allowance recorded, Recorded Investment 12,121 14,390 12,121 14,390 13,482
With a specific allowance recorded, Allowance for Loan Losses Allocated 1,342 1,596 1,342 1,596 1,541
With a specific allowance recorded, Average Recorded Investment 12,077 14,609 12,587 14,626  
With a specific allowance recorded, Interest Income Recognized 132 173 423 497  
With a specific allowance recorded, Cash Basis Income Recognized 127 166 373 439  
Consumer Loans [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 2,921 2,329 2,921 2,329 2,885
With no specific allowance recorded, Recorded Investment 1,903 1,536 1,903 1,536 2,084
With no specific allowance recorded, Average Recorded Investment 1,917 1,650 1,963 1,725  
With no specific allowance recorded, Interest Income Recognized 10 5 18 18  
With no specific allowance recorded, Cash Basis Income Recognized 10 4 18 16  
With a specific allowance recorded, Unpaid Principal Balance 6,805 8,925 6,805 8,925 8,529
With a specific allowance recorded, Recorded Investment 6,805 8,925 6,805 8,925 8,529
With a specific allowance recorded, Allowance for Loan Losses Allocated 516 745 516 745 707
With a specific allowance recorded, Average Recorded Investment 7,017 9,094 7,567 9,620  
With a specific allowance recorded, Interest Income Recognized 85 117 283 353  
With a specific allowance recorded, Cash Basis Income Recognized 84 116 261 330  
Consumer Loans [Member] | Home Equity [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 1,728 1,709 1,728 1,709 2,245
With no specific allowance recorded, Recorded Investment 1,272 1,179 1,272 1,179 1,718
With no specific allowance recorded, Average Recorded Investment 1,306 1,284 1,415 1,377  
With no specific allowance recorded, Interest Income Recognized 9 4 14 14  
With no specific allowance recorded, Cash Basis Income Recognized 9 4 14 12  
With a specific allowance recorded, Unpaid Principal Balance 5,997 8,336 5,997 8,336 7,236
With a specific allowance recorded, Recorded Investment 5,997 8,336 5,997 8,336 7,236
With a specific allowance recorded, Allowance for Loan Losses Allocated 435 628 435 628 522
With a specific allowance recorded, Average Recorded Investment 6,138 8,445 6,592 8,931  
With a specific allowance recorded, Interest Income Recognized 77 117 257 344  
With a specific allowance recorded, Cash Basis Income Recognized 76 116 238 321  
Consumer Loans [Member] | Auto [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 13 27 13 27 20
With no specific allowance recorded, Recorded Investment 8 19 8 19 14
With no specific allowance recorded, Average Recorded Investment 9 21 10 28  
With a specific allowance recorded, Average Recorded Investment   2   4  
Consumer Loans [Member] | Marine [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 543 499 543 499 496
With no specific allowance recorded, Recorded Investment 301 273 301 273 271
With no specific allowance recorded, Average Recorded Investment 302 279 294 250  
With no specific allowance recorded, Interest Income Recognized       2  
With no specific allowance recorded, Cash Basis Income Recognized       2  
With a specific allowance recorded, Unpaid Principal Balance 153   153   163
With a specific allowance recorded, Recorded Investment 153   153   163
With a specific allowance recorded, Allowance for Loan Losses Allocated 4   4   3
With a specific allowance recorded, Average Recorded Investment 155   158    
With a specific allowance recorded, Interest Income Recognized 2   6    
With a specific allowance recorded, Cash Basis Income Recognized 2   4    
Consumer Loans [Member] | Recreational Vehicle [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance 637 94 637 94 121
With no specific allowance recorded, Recorded Investment 322 65 322 65 78
With no specific allowance recorded, Average Recorded Investment 298 66 241 70  
With no specific allowance recorded, Interest Income Recognized 1 1 4 2  
With no specific allowance recorded, Cash Basis Income Recognized 1   4 2  
With a specific allowance recorded, Unpaid Principal Balance 655 589 655 589 1,122
With a specific allowance recorded, Recorded Investment 655 589 655 589 1,122
With a specific allowance recorded, Allowance for Loan Losses Allocated 77 117 77 117 181
With a specific allowance recorded, Average Recorded Investment 724 $ 647 815 685  
With a specific allowance recorded, Interest Income Recognized 6   20 9  
With a specific allowance recorded, Cash Basis Income Recognized 6   19 $ 9  
Consumer Loans [Member] | Other [Member]          
Financing Receivable Impaired [Line Items]          
With no specific allowance recorded, Unpaid Principal Balance         3
With no specific allowance recorded, Recorded Investment         3
With no specific allowance recorded, Average Recorded Investment $ 2   3    
With a specific allowance recorded, Unpaid Principal Balance         8
With a specific allowance recorded, Recorded Investment         8
With a specific allowance recorded, Allowance for Loan Losses Allocated         $ 1
With a specific allowance recorded, Average Recorded Investment     $ 2