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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, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | $ 19,813 | $ 24,063
Non-Accrual | 26,415 | 17,792
Current | 6,695,032 | 6,080,136
Total loans | $ 6,768,175 | 6,154,561
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 | $ 17,070 | 21,250
90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 2,743 | 2,813
Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased Credit-Impaired Loans | 26,915 | 32,570
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 4,900 | 12,573
Non-Accrual | 0 | 0
Current | 3,495,600 | 3,200,322
Total loans | 3,502,381 | 3,214,999
Multi-family | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 4,900 | 12,573
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] |  |
Purchased Credit-Impaired Loans | 1,881 | 2,104
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 103 | 350
Non-Accrual | 17,392 | 8,443
Current | 1,130,831 | 978,881
Total loans | 1,149,090 | 988,711
Commercial and industrial | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 103 | 350
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] |  |
Purchased Credit-Impaired Loans | 764 | 1,037
Commercial real estate - owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 202 | 137
Non-Accrual | 1,453 | 2,039
Current | 472,501 | 379,227
Total loans | 484,728 | 393,632
Commercial real estate - owner occupied | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 202 | 137
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] |  |
Purchased Credit-Impaired Loans | 10,572 | 12,229
Commercial real estate - non-owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 93 | 0
Non-Accrual | 160 | 2,057
Current | 1,213,216 | 1,185,331
Total loans | 1,218,719 | 1,193,715
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 | 93 | 0
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] |  |
Purchased Credit-Impaired Loans | 5,250 | 6,327
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Non-Accrual | 0 | 0
Current | 85,393 | 64,789
Total loans | 85,393 | 64,789
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] |  |
Purchased Credit-Impaired Loans | 0 | 0
Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 7,628 | 4,417
Non-Accrual | 5,420 | 2,959
Current | 215,361 | 178,559
Total loans | 234,090 | 193,502
Residential real estate | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 7,628 | 4,417
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] |  |
Purchased Credit-Impaired Loans | 5,681 | 7,567
Manufactured housing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 6,771 | 6,574
Non-Accrual | 1,959 | 2,236
Current | 78,946 | 89,850
Total loans | 90,227 | 101,730
Manufactured housing | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 4,028 | 3,761
Manufactured housing | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 2,743 | 2,813
Manufactured housing | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Purchased Credit-Impaired Loans | 2,551 | 3,070
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 116 | 12
Non-Accrual | 31 | 58
Current | 3,184 | 3,177
Total loans | 3,547 | 3,483
Other | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 116 | 12
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] |  |
Purchased Credit-Impaired Loans | $ 216 | $ 236

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