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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