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Loans Receivable and Allowance for Loan Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | $ 62,113 | $ 59,053
Recorded Investment | 53,481 | 52,019
Average Recorded Investment | 56,048 | 52,002
Interest Income Recognized | 391 | 1,486
Residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 25,721 | 24,860
Recorded Investment | 22,179 | 21,401
Related Allowance | 1,728 | 1,716
Average Recorded Investment | 22,278 | 21,732
Interest Income Recognized | 243 | 1,003
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 5,682 | 5,694
Recorded Investment | 5,554 | 5,633
Related Allowance | 152 | 270
Average Recorded Investment | 5,691 | 5,697
Interest Income Recognized | 13 | 95
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 2,553 | 2,553
Recorded Investment | 2,517 | 2,517
Related Allowance | 0 | 0
Average Recorded Investment | 2,517 | 2,514
Interest Income Recognized | 0 | 0
Mortgage Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 33,956 | 33,107
Recorded Investment | 30,250 | 29,551
Related Allowance | 1,880 | 1,986
Average Recorded Investment | 30,486 | 29,943
Interest Income Recognized | 256 | 1,098
Commercial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 25,223 | 23,211
Recorded Investment | 20,823 | 20,255
Related Allowance | 1,050 | 268
Average Recorded Investment | 23,132 | 19,774
Interest Income Recognized | 104 | 263
Consumer Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 2,934 | 2,735
Recorded Investment | 2,408 | 2,213
Related Allowance | 102 | 80
Average Recorded Investment | 2,430 | 2,285
Interest Income Recognized | 31 | 125
Loans With No Related Allowance [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 37,518 | 38,123
Recorded Investment | 30,038 |
Related Allowance | 0 | 0
Average Recorded Investment | 32,494 | 26,971
Interest Income Recognized | 201 | 842
Loans With No Related Allowance [Member] | Residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 10,700 | 10,691
Recorded Investment | 8,229 | 7,881
Related Allowance | 0 | 0
Average Recorded Investment | 8,270 | 8,027
Interest Income Recognized | 113 | 484
Loans With No Related Allowance [Member] | Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 4,600 | 1,556
Recorded Investment | 4,472 | 1,556
Related Allowance | 0 | 0
Average Recorded Investment | 4,606 | 1,586
Interest Income Recognized | 0 | 40
Loans With No Related Allowance [Member] | Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 2,553 | 2,553
Recorded Investment | 2,517 | 2,517
Related Allowance | 0 | 0
Average Recorded Investment | 2,517 | 2,514
Interest Income Recognized | 0 | 0
Loans With No Related Allowance [Member] | Mortgage Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 17,853 | 14,800
Recorded Investment | 15,218 | 11,954
Related Allowance | 0 | 0
Average Recorded Investment | 15,393 | 12,127
Interest Income Recognized | 113 | 524
Loans With No Related Allowance [Member] | Commercial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 18,191 | 21,830
Recorded Investment | 13,861 | 18,874
Related Allowance | 0 | 0
Average Recorded Investment | 16,130 | 13,818
Interest Income Recognized | 76 | 259
Loans With No Related Allowance [Member] | Consumer Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 1,474 | 1,493
Recorded Investment | 959 | 981
Related Allowance | 0 | 0
Average Recorded Investment | 971 | 1,026
Interest Income Recognized | 12 | 59
Loans With Allowance Recorded [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 24,595 | 20,930
Recorded Investment | 23,443 | 20,210
Related Allowance | 3,032 | 2,334
Average Recorded Investment | 23,554 | 25,031
Interest Income Recognized | 190 | 644
Loans With Allowance Recorded [Member] | Residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 15,021 | 14,169
Recorded Investment | 13,950 | 13,520
Related Allowance | 1,728 | 1,716
Average Recorded Investment | 14,008 | 13,705
Interest Income Recognized | 130 | 519
Loans With Allowance Recorded [Member] | Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 1,082 | 4,138
Recorded Investment | 1,082 | 4,077
Related Allowance | 152 | 270
Average Recorded Investment | 1,085 | 4,111
Interest Income Recognized | 13 | 55
Loans With Allowance Recorded [Member] | Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
Loans With Allowance Recorded [Member] | Mortgage Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 16,103 | 18,307
Recorded Investment | 15,032 | 17,597
Related Allowance | 1,880 | 1,986
Average Recorded Investment | 15,093 | 17,816
Interest Income Recognized | 143 | 574
Loans With Allowance Recorded [Member] | Commercial Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 7,032 | 1,381
Recorded Investment | 6,962 | 1,381
Related Allowance | 1,050 | 268
Average Recorded Investment | 7,002 | 5,956
Interest Income Recognized | 28 | 4
Loans With Allowance Recorded [Member] | Consumer Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 1,460 | 1,242
Recorded Investment | 1,449 | 1,232
Related Allowance | 102 | 80
Average Recorded Investment | 1,459 | 1,259
Interest Income Recognized | $ 19 | $ 66

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