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Loans Receivable, Net - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans pledged |  | $ 2,918,000,000 |  |
Impaired loans on non-accrual commercial real estate, multi-family, land, construction, commercial and industrial loans |  | 250,000 |  |
Impaired loan portfolio total |  | 29,800,000 | $ 47,000,000 |
Specific reserves to loans accruing troubled debt restructurings |  | 0 | 0 | $ 510,000
Average balance of impaired loans |  | 38,100,000 | 39,800,000 | 38,400,000
Interest income on non-accrual loans |  | 419,000 | 639,000 | 391,000
Troubled debt restructuring loans |  | 26,500,000 | 42,100,000 |
Troubled debt restructuring loans with accrual interest |  | 22,900,000 | 33,300,000 | 27,000,000
Commitments to lend additional funds to borrowers |  | 0 |  |
Loans with non-accrual of interest |  | 17,415,000 | 20,865,000 | 13,600,000
Financing receivables 90 days past due and still accruing |  | 0 |  |
Non-accrual loan total troubled debt restructurings |  | 3,600,000 | 8,800,000 | $ 3,500,000
Allowance for loan losses |  | 0 |  |
Colonial American Bank |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 |  |  |
Residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans with non-accrual of interest |  | 7,389,000 | $ 4,190,000 |
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount |  | 2,200,000 |  |
Foreclosed property held |  | $ 700,000 |  |

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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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