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, 2019	Dec. 31, 2018
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	$ 44,634	$ 40,180
Loans with no related allowance, Recorded Investment	37,355	31,118
Loans with no related allowance, Average Recorded Investment	37,692	32,156
Loans with no related allowance, Interest Income Recognized	305	1,012
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	28,533	20,059
Loans with an allowance recorded, Recorded Investment	26,053	19,566
Loans with an allowance recorded, Average Recorded Investment	27,146	21,712
Loans with an allowance recorded, Interest Income Recognized	370	953
Total impaired loans
Unpaid Principal Balance	73,167	60,239
Recorded Investment	63,408	50,684
Related Allowance	1,749	1,165
Average Recorded Investment	64,838	53,868
Interest Income Recognized	675	1,965
Mortgage Portfolio Segment [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	30,104	16,563
Loans with no related allowance, Recorded Investment	27,020	13,551
Loans with no related allowance, Average Recorded Investment	27,065	13,687
Loans with no related allowance, Interest Income Recognized	170	594
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	10,051	11,612
Loans with an allowance recorded, Recorded Investment	9,631	11,129
Loans with an allowance recorded, Average Recorded Investment	9,658	11,238
Loans with an allowance recorded, Interest Income Recognized	102	478
Total impaired loans
Unpaid Principal Balance	40,155	28,175
Recorded Investment	36,651	24,680
Related Allowance	897	1,026
Average Recorded Investment	36,723	24,925
Interest Income Recognized	272	1,072
Mortgage Portfolio Segment [Member] \| Residential [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	16,094	15,013
Loans with no related allowance, Recorded Investment	13,010	12,005
Loans with no related allowance, Average Recorded Investment	13,055	12,141
Loans with no related allowance, Interest Income Recognized	170	594
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	9,018	10,573
Loans with an allowance recorded, Recorded Investment	8,598	10,090
Loans with an allowance recorded, Average Recorded Investment	8,621	10,186
Loans with an allowance recorded, Interest Income Recognized	89	425
Total impaired loans
Unpaid Principal Balance	25,112	25,586
Recorded Investment	21,608	22,095
Related Allowance	828	954
Average Recorded Investment	21,676	22,327
Interest Income Recognized	259	1,019
Mortgage Portfolio Segment [Member] \| Commercial [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	14,010	1,550
Loans with no related allowance, Recorded Investment	14,010	1,546
Loans with no related allowance, Average Recorded Investment	14,010	1,546
Loans with no related allowance, Interest Income Recognized	0	0
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	1,033	1,039
Loans with an allowance recorded, Recorded Investment	1,033	1,039
Loans with an allowance recorded, Average Recorded Investment	1,037	1,052
Loans with an allowance recorded, Interest Income Recognized	13	53
Total impaired loans
Unpaid Principal Balance	15,043	2,589
Recorded Investment	15,043	2,585
Related Allowance	69	72
Average Recorded Investment	15,047	2,598
Interest Income Recognized	13	53
Commercial Loans [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	12,690	21,746
Loans with no related allowance, Recorded Investment	9,054	16,254
Loans with no related allowance, Average Recorded Investment	9,330	17,083
Loans with no related allowance, Interest Income Recognized	115	328
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	17,539	7,493
Loans with an allowance recorded, Recorded Investment	15,490	7,493
Loans with an allowance recorded, Average Recorded Investment	16,550	9,512
Loans with an allowance recorded, Interest Income Recognized	255	435
Total impaired loans
Unpaid Principal Balance	30,229	29,239
Recorded Investment	24,544	23,747
Related Allowance	806	92
Average Recorded Investment	25,880	26,595
Interest Income Recognized	370	763
Consumer Loans [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	1,840	1,871
Loans with no related allowance, Recorded Investment	1,281	1,313
Loans with no related allowance, Average Recorded Investment	1,297	1,386
Loans with no related allowance, Interest Income Recognized	20	90
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	943	954
Loans with an allowance recorded, Recorded Investment	932	944
Loans with an allowance recorded, Average Recorded Investment	938	962
Loans with an allowance recorded, Interest Income Recognized	13	40
Total impaired loans
Unpaid Principal Balance	2,783	2,825
Recorded Investment	2,213	2,257
Related Allowance	46	47
Average Recorded Investment	2,235	2,348
Interest Income Recognized	$ 33	$ 130

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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