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Loans Receivable and Allowance for Loan 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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, Total	$ 42,201		$ 42,201		$ 29,411
Unpaid Principal Balance
Unpaid Principal Balance, Total	46,131		46,131		30,692
Related Allowance	1,527		1,527		1,360
Average Recorded Investment
Average Recorded Investment, With an allowance recorded			6
Average Recorded Investment, Total	36,846	$ 63,525	35,614	$ 56,934
Interest Income Recognized
Interest Income Recognized, Total	750	861	1,261	2,002
Multi-family
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded					0
Recorded Investment Net of Charge Offs, With an allowance recorded					0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded					0
Unpaid Principal Balance, With an allowance recorded					0
Related Allowance					0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded		2,080		1,205
Average Recorded Investment, With an allowance recorded		383		290
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded		38		38
Interest Income Recognized, With an allowance recorded		5		15
Commercial and industrial
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	19,433		19,433		2,396
Recorded Investment Net of Charge Offs, With an allowance recorded	1,060		1,060		6,120
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	22,354		22,354		3,430
Unpaid Principal Balance, With an allowance recorded	1,331		1,331		6,120
Related Allowance	625		625		1,024
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	13,345	21,859	8,796	18,681
Average Recorded Investment, With an allowance recorded	1,963	7,561	5,400	7,256
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	354	406	450	879
Interest Income Recognized, With an allowance recorded	0	43	22	155
Commercial real estate - owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	1,669		1,669		1,210
Recorded Investment Net of Charge Offs, With an allowance recorded	1,281		1,281		840
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,936		1,936		1,210
Unpaid Principal Balance, With an allowance recorded	1,281		1,281		840
Related Allowance	740		740		287
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	1,744	10,182	1,589	9,651
Average Recorded Investment, With an allowance recorded	1,056	0	950	6
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	15	201	18	403
Interest Income Recognized, With an allowance recorded	1	0	3	0
Commercial real estate - non-owner occupied
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	184		184		2,002
Recorded Investment Net of Charge Offs, With an allowance recorded	0		0		149
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	428		428		2,114
Unpaid Principal Balance, With an allowance recorded	0		0		204
Related Allowance	0		0		14
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	184	7,983	989	6,081
Average Recorded Investment, With an allowance recorded	51	328	94	438
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	91	118	93	133
Interest Income Recognized, With an allowance recorded	0	2	0	6
Other
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	32		32		57
Recorded Investment Net of Charge Offs, With an allowance recorded	24		24		0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	32		32		57
Unpaid Principal Balance, With an allowance recorded	24		24		0
Related Allowance	15		15		0
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	44	43	50	45
Average Recorded Investment, With an allowance recorded	12	0		36
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	0	0	0	0
Interest Income Recognized, With an allowance recorded	0	0	0	0
Residential real estate
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	7,457		7,457		6,682
Recorded Investment Net of Charge Offs, With an allowance recorded	721		721		290
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	7,664		7,664		6,749
Unpaid Principal Balance, With an allowance recorded	741		741		303
Related Allowance	142		142		35
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	5,228	3,835	4,865	4,039
Average Recorded Investment, With an allowance recorded	2,862	300	2,729	421
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	125	39	126	83
Interest Income Recognized, With an allowance recorded	0	0	84	0
Manufactured housing
Recorded Investment Net of Charge offs
Recorded Investment Net of Charge Offs, With no related allowance recorded	10,340		10,340		9,665
Recorded Investment Net of Charge Offs, With an allowance recorded	0		0
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	10,340		10,340		$ 9,665
Unpaid Principal Balance, With an allowance recorded	0		0
Related Allowance	5		5
Average Recorded Investment
Average Recorded Investment, With no related allowance recorded	10,243	8,971	10,038	8,785
Average Recorded Investment, With an allowance recorded	114		108
Interest Income Recognized
Interest Income Recognized, With no related allowance recorded	164	$ 9	457	$ 290
Interest Income Recognized, With an allowance recorded	$ 0		$ 8

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