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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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