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Loans Receivable and Allowance for Loan Losses - Loans by Type and Performance Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	$ 15,551	$ 19,813
Non-Accrual	27,494	26,415
Current	7,073,879	6,695,032
Total loans	7,138,498	6,768,175
Loans receivable, at amortized cost or lower of cost or market	$ 7,138,498	6,768,175
Due days for loan payments (days)	30 days
Delinquent period (days)	90 days
30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	$ 13,363	17,070
90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,188	2,743
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	21,574	26,915
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	4,900
Non-Accrual	1,155	0
Current	3,282,452	3,495,600
Total loans	3,285,297	3,502,381
Loans receivable, at amortized cost or lower of cost or market	3,285,297	3,502,381
Multi-family | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	4,900
Multi-family | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Multi-family | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,690	1,881
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,914	103
Non-Accrual	17,764	17,392
Current	1,353,586	1,130,831
Total loans	1,373,800	1,149,090
Loans receivable, at amortized cost or lower of cost or market	1,373,800	1,149,090
Commercial and industrial | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,914	103
Commercial and industrial | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Commercial and industrial | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	536	764
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	193	202
Non-Accrual	1,037	1,453
Current	567,809	472,501
Total loans	577,477	484,728
Loans receivable, at amortized cost or lower of cost or market	577,477	484,728
Commercial real estate owner occupied | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	193	202
Commercial real estate owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Commercial real estate owner occupied | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,438	10,572
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,190	93
Non-Accrual	129	160
Current	1,119,443	1,213,216
Total loans	1,125,106	1,218,719
Loans receivable, at amortized cost or lower of cost or market	1,125,106	1,218,719
Commercial real estate non-owner occupied | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	1,190	93
Commercial real estate non-owner occupied | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Commercial real estate non-owner occupied | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,344	5,250
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Non-Accrual	0	0
Current	56,491	85,393
Total loans	56,491	85,393
Loans receivable, at amortized cost or lower of cost or market	56,491	85,393
Construction | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Construction | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Construction | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	5,940	7,628
Non-Accrual	5,605	5,420
Current	550,679	215,361
Total loans	566,561	234,090
Loans receivable, at amortized cost or lower of cost or market	566,561	234,090
Residential real estate | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	5,940	7,628
Residential real estate | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Residential real estate | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,337	5,681
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	6,114	6,771
Non-Accrual	1,693	1,959
Current	69,916	78,946
Total loans	79,731	90,227
Loans receivable, at amortized cost or lower of cost or market	79,731	90,227
Manufactured housing | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	3,926	4,028
Manufactured housing | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	2,188	2,743
Manufactured housing | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,008	2,551
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	200	116
Non-Accrual	111	31
Current	73,503	3,184
Total loans	74,035	3,547
Loans receivable, at amortized cost or lower of cost or market	74,035	3,547
Other | 30 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	200	116
Other | 90 Days Or More Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due Still Accruing	0	0
Other | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 221	$ 216

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