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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Summary of Recorded Investment Net Charge-Offs, Unpaid Principal Balance and Related Allowance for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, Total	$ 30,241		$ 30,241		$ 39,118
Unpaid principal balance
Unpaid Principal Balance, Total	33,564		33,564		42,031
Related Allowance	303		303		845
Average recorded investment
Average Recorded Investment, Total	34,800	$ 36,045	36,239	$ 36,841
Interest income recognized
Interest Income Recognized, Total	296	222	502	380
Multi-family
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	0		0		0
Recorded Investment Net of Charge Offs, With an allowance recorded	0		0		1,155
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	534		534		0
Unpaid Principal Balance, With an allowance recorded	0		0		1,155
Related Allowance	0		0		539
Average recorded investment
Average Recorded Investment, With no related allowance recorded	998	672	665	448
Average Recorded Investment, With an allowance recorded	0	0	385	0
Interest income recognized
Interest Income Recognized, With no related allowance recorded	0	8	0	8
Interest Income Recognized, With an allowance recorded	0	0	0	0
Commercial and industrial
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	4,663		4,663		13,660
Recorded Investment Net of Charge Offs, With an allowance recorded	5,942		5,942		4,168
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	6,144		6,144		15,263
Unpaid Principal Balance, With an allowance recorded	6,048		6,048		4,351
Related Allowance	225		225		261
Average recorded investment
Average Recorded Investment, With no related allowance recorded	7,923	5,736	9,836	6,870
Average Recorded Investment, With an allowance recorded	6,084	8,283	5,445	8,296
Interest income recognized
Interest Income Recognized, With no related allowance recorded	16	2	18	2
Interest Income Recognized, With an allowance recorded	58	11	97	12
Commercial real estate owner occupied
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	784		784		1,037
Recorded Investment Net of Charge Offs, With an allowance recorded	166		166		32
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	1,555		1,555		1,766
Unpaid Principal Balance, With an allowance recorded	166		166		32
Related Allowance	31		31		1
Average recorded investment
Average Recorded Investment, With no related allowance recorded	669	664	792	713
Average Recorded Investment, With an allowance recorded	239	455	170	517
Interest income recognized
Interest Income Recognized, With no related allowance recorded	0	0	21	0
Interest Income Recognized, With an allowance recorded	0	1	1	2
Commercial real estate non-owner occupied
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	94		94		129
Recorded Investment Net of Charge Offs, With an allowance recorded	0		0
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	206		206		241
Unpaid Principal Balance, With an allowance recorded	0		0
Related Allowance	0		0
Average recorded investment
Average Recorded Investment, With no related allowance recorded	98	1,390	108	980
Average Recorded Investment, With an allowance recorded	0		0
Interest income recognized
Interest Income Recognized, With no related allowance recorded	0	8	0	8
Interest Income Recognized, With an allowance recorded	0		0
Residential real estate
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	4,365		4,365		4,842
Recorded Investment Net of Charge Offs, With an allowance recorded	3,742		3,742		3,789
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	4,684		4,684		5,128
Unpaid Principal Balance, With an allowance recorded	3,742		3,742		3,789
Related Allowance	39		39		41
Average recorded investment
Average Recorded Investment, With no related allowance recorded	4,544	3,959	4,643	3,849
Average Recorded Investment, With an allowance recorded	3,794	4,550	3,792	4,906
Interest income recognized
Interest Income Recognized, With no related allowance recorded	61	2	61	2
Interest Income Recognized, With an allowance recorded	28	38	54	63
Manufactured housing
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	9,961		9,961		10,027
Recorded Investment Net of Charge Offs, With an allowance recorded	165		165		168
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	9,961		9,961		10,027
Unpaid Principal Balance, With an allowance recorded	165		165		168
Related Allowance	3		3		3
Average recorded investment
Average Recorded Investment, With no related allowance recorded	10,051	10,015	10,043	9,963
Average Recorded Investment, With an allowance recorded	166	225	167	225
Interest income recognized
Interest Income Recognized, With no related allowance recorded	123	146	238	277
Interest Income Recognized, With an allowance recorded	2	6	4	6
Other consumer
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	132		132		111
Recorded Investment Net of Charge Offs, With an allowance recorded	227		227
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	132		132		$ 111
Unpaid Principal Balance, With an allowance recorded	227		227
Related Allowance	5		5
Average recorded investment
Average Recorded Investment, With no related allowance recorded	120	96	117	74
Average Recorded Investment, With an allowance recorded	114		76
Interest income recognized
Interest Income Recognized, With no related allowance recorded	8	$ 0	8	$ 0
Interest Income Recognized, With an allowance recorded	$ 0		$ 0

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