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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, Total	$ 27,668		$ 27,668		$ 39,118
Unpaid principal balance
Unpaid Principal Balance, Total	30,524		30,524		42,031
Related Allowance	395		395		845
Average recorded investment
Average Recorded Investment, Total	28,955	$ 36,445	34,097	$ 36,446
Interest income recognized
Interest Income Recognized, Total	1,507	435	2,009	815
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	0		0		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	0	1,343	499	672
Average Recorded Investment, With an allowance recorded	0	0	289	0
Interest income recognized
Interest Income Recognized, With no related allowance recorded	149	0	149	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	4,602		4,602		13,660
Recorded Investment Net of Charge Offs, With an allowance recorded	773		773		4,168
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	6,245		6,245		15,263
Unpaid Principal Balance, With an allowance recorded	773		773		4,351
Related Allowance	167		167		261
Average recorded investment
Average Recorded Investment, With no related allowance recorded	4,631	7,765	8,528	7,623
Average Recorded Investment, With an allowance recorded	3,358	5,787	4,277	7,089
Interest income recognized
Interest Income Recognized, With no related allowance recorded	991	166	1,009	168
Interest Income Recognized, With an allowance recorded	0	27	97	39
Commercial real estate owner occupied
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	2,068		2,068		1,037
Recorded Investment Net of Charge Offs, With an allowance recorded	16		16		32
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	2,849		2,849		1,766
Unpaid Principal Balance, With an allowance recorded	16		16		32
Related Allowance	0		0		1
Average recorded investment
Average Recorded Investment, With no related allowance recorded	1,425	711	1,111	711
Average Recorded Investment, With an allowance recorded	91	336	131	546
Interest income recognized
Interest Income Recognized, With no related allowance recorded	74	0	95	0
Interest Income Recognized, With an allowance recorded	0	9	1	11
Commercial real estate non-owner occupied
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	83		83		129
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	194		194		241
Average recorded investment
Average Recorded Investment, With no related allowance recorded	89	1,347	102	774
Interest income recognized
Interest Income Recognized, With no related allowance recorded	7	0	7	8
Residential real estate
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	4,686		4,686		4,842
Recorded Investment Net of Charge Offs, With an allowance recorded	4,371		4,371		3,789
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	5,007		5,007		5,128
Unpaid Principal Balance, With an allowance recorded	4,371		4,371		3,789
Related Allowance	40		40		41
Average recorded investment
Average Recorded Investment, With no related allowance recorded	4,526	4,281	4,654	3,952
Average Recorded Investment, With an allowance recorded	4,057	4,398	3,937	4,760
Interest income recognized
Interest Income Recognized, With no related allowance recorded	21	23	82	25
Interest Income Recognized, With an allowance recorded	47	61	101	124
Manufactured housing
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	4,496		4,496		10,027
Recorded Investment Net of Charge Offs, With an allowance recorded	5,433		5,433		168
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	4,496		4,496		10,027
Unpaid Principal Balance, With an allowance recorded	5,433		5,433		168
Related Allowance	123		123		3
Average recorded investment
Average Recorded Investment, With no related allowance recorded	7,229	10,147	8,656	10,011
Average Recorded Investment, With an allowance recorded	2,799	227	1,483	225
Interest income recognized
Interest Income Recognized, With no related allowance recorded	97	144	335	421
Interest Income Recognized, With an allowance recorded	45	4	49	10
Other consumer
Recorded investment net of charge-offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	195		195		111
Recorded Investment Net of Charge Offs, With an allowance recorded	945		945
Unpaid principal balance
Unpaid Principal Balance, With no related allowance recorded	195		195		$ 111
Unpaid Principal Balance, With an allowance recorded	945		945
Related Allowance	65		65
Average recorded investment
Average Recorded Investment, With no related allowance recorded	164	103	137	83
Average Recorded Investment, With an allowance recorded	586		293
Interest income recognized
Interest Income Recognized, With no related allowance recorded	76	$ 1	84	$ 1
Interest Income Recognized, With an allowance recorded	$ 0		$ 0

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