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Loans Receivable and Allowance for Loan Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | $ 36,746 | $ 38,123
Loans with no related allowance, Recorded Investment | 29,700 | 31,809
Loans with no related allowance, Average Recorded Investment | 30,027 | 26,971
Loans with no related allowance, Interest Income Recognized | 671 | 842
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 22,186 | 20,930
Loans with an allowance recorded, Recorded Investment | 20,481 | 20,210
Loans with an allowance recorded, Average Recorded Investment | 21,171 | 25,031
Loans with an allowance recorded, Interest Income Recognized | 513 | 644
Total impaired loans |  |
Unpaid Principal Balance | 58,932 | 59,053
Recorded Investment | 50,181 | 52,019
Related Allowance | 2,872 | 2,334
Average Recorded Investment | 51,198 | 52,002
Interest Income Recognized | 1,184 | 1,486
Mortgage Portfolio Segment [Member] |  |
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | 17,635 | 14,800
Loans with no related allowance, Recorded Investment | 14,749 | 11,954
Loans with no related allowance, Average Recorded Investment | 14,887 | 12,127
Loans with no related allowance, Interest Income Recognized | 340 | 524
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 14,874 | 18,307
Loans with an allowance recorded, Recorded Investment | 13,829 | 17,597
Loans with an allowance recorded, Average Recorded Investment | 13,956 | 17,816
Loans with an allowance recorded, Interest Income Recognized | 414 | 574
Total impaired loans |  |
Unpaid Principal Balance | 32,509 | 33,107
Recorded Investment | 28,578 | 29,551
Related Allowance | 1,773 | 1,986
Average Recorded Investment | 28,843 | 29,943
Interest Income Recognized | 754 | 1,098
Mortgage Portfolio Segment [Member] | Residential [Member] |  |
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | 13,035 | 10,691
Loans with no related allowance, Recorded Investment | 10,277 | 7,881
Loans with no related allowance, Average Recorded Investment | 10,391 | 8,027
Loans with no related allowance, Interest Income Recognized | 340 | 484
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 13,803 | 14,169
Loans with an allowance recorded, Recorded Investment | 12,759 | 13,520
Loans with an allowance recorded, Average Recorded Investment | 12,873 | 13,705
Loans with an allowance recorded, Interest Income Recognized | 374 | 519
Total impaired loans |  |
Unpaid Principal Balance | 26,838 | 24,860
Recorded Investment | 23,036 | 21,401
Related Allowance | 1,633 | 1,716
Average Recorded Investment | 23,264 | 21,732
Interest Income Recognized | 714 | 1,003
Mortgage Portfolio Segment [Member] | Commercial [Member] |  |
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | 4,600 | 1,556
Loans with no related allowance, Recorded Investment | 4,472 | 1,556
Loans with no related allowance, Average Recorded Investment | 4,496 | 1,586
Loans with no related allowance, Interest Income Recognized | 0 | 40
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 1,071 | 4,138
Loans with an allowance recorded, Recorded Investment | 1,070 | 4,077
Loans with an allowance recorded, Average Recorded Investment | 1,083 | 4,111
Loans with an allowance recorded, Interest Income Recognized | 40 | 55
Total impaired loans |  |
Unpaid Principal Balance | 5,671 | 5,694
Recorded Investment | 5,542 | 5,633
Related Allowance | 140 | 270
Average Recorded Investment | 5,579 | 5,697
Interest Income Recognized | 40 | 95
Mortgage Portfolio Segment [Member] | Construction [Member] |  |
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | 0 | 2,553
Loans with no related allowance, Recorded Investment | 0 | 2,517
Loans with no related allowance, Average Recorded Investment | 0 | 2,514
Loans with no related allowance, Interest Income Recognized | 0 | 0
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 0 | 0
Loans with an allowance recorded, Recorded Investment | 0 | 0
Loans with an allowance recorded, Average Recorded Investment | 0 | 0
Loans with an allowance recorded, Interest Income Recognized | 0 | 0
Total impaired loans |  |
Unpaid Principal Balance | 0 | 2,553
Recorded Investment | 0 | 2,517
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 2,514
Interest Income Recognized | 0 | 0
Commercial Loans [Member] |  |
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | 17,505 | 21,830
Loans with no related allowance, Recorded Investment | 13,884 | 18,874
Loans with no related allowance, Average Recorded Investment | 13,954 | 13,818
Loans with no related allowance, Interest Income Recognized | 280 | 259
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 6,158 | 1,381
Loans with an allowance recorded, Recorded Investment | 5,509 | 1,381
Loans with an allowance recorded, Average Recorded Investment | 6,045 | 5,956
Loans with an allowance recorded, Interest Income Recognized | 52 | 4
Total impaired loans |  |
Unpaid Principal Balance | 23,663 | 23,211
Recorded Investment | 19,393 | 20,255
Related Allowance | 1,028 | 268
Average Recorded Investment | 19,999 | 19,774
Interest Income Recognized | 332 | 263
Consumer Loans [Member] |  |
Loans with no related allowance |  |
Loans with no related allowance, Unpaid Principal Balance | 1,606 | 1,493
Loans with no related allowance, Recorded Investment | 1,067 | 981
Loans with no related allowance, Average Recorded Investment | 1,186 | 1,026
Loans with no related allowance, Interest Income Recognized | 51 | 59
Loans with an allowance recorded |  |
Loans with an allowance recorded, Unpaid Principal Balance | 1,154 | 1,242
Loans with an allowance recorded, Recorded Investment | 1,143 | 1,232
Loans with an allowance recorded, Average Recorded Investment | 1,170 | 1,259
Loans with an allowance recorded, Interest Income Recognized | 47 | 66
Total impaired loans |  |
Unpaid Principal Balance | 2,760 | 2,735
Recorded Investment | 2,210 | 2,213
Related Allowance | 71 | 80
Average Recorded Investment | 2,356 | 2,285
Interest Income Recognized | $ 98 | $ 125

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