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Commitments, Contingencies and Related Party Transactions | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments, Contingencies and Related Party Transactions | Commitments, Contingencies and Related Party Transactions Credit Extensions — In the normal course of business, the Company has various outstanding commitments to extend credit that are not reflected in the accompanying Consolidated Financial Statements. While the Company does not anticipate losses as a result of these transactions, commitments to extend credit are included in determining the appropriate level of the allowance for unfunded commitments, and outstanding commercial and standby letters of credit (“SBLCs”). The following table presents the Company’s credit-related commitments as of the periods indicated:
($ in thousands) |  | December 31,
| 2017 |  | 2016
Loan commitments |  | $ | 5,075,480 |  |  | $ | 5,077,869 |
Commercial letters of credit and SBLCs |  | $ | 1,655,897 |  |  | $ | 1,525,613 |
Loan commitments are agreements to lend to a customer provided that there are no violations of any conditions established in the agreement. Commitments generally have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future funding requirements. Commercial letters of credit are issued to facilitate domestic and foreign trade transactions, while SBLCs are generally contingent upon the failure of the customers to perform according to the terms of the underlying contract with the third party. As a result, the total contractual amounts do not necessarily represent future funding requirements. The Company’s historical experience is that SBLCs typically expire without being funded. Additionally, in many cases, the Company holds collateral in various forms against these SBLCs. As a part of its risk management activities, the Company monitors the creditworthiness of customers in conjunction with its SBLC exposure. Customers are obligated to reimburse the Company for any payment made on the customers’ behalf. If customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. As of December 31, 2017, total letters of credit, which amounted to $1.66 billion, were comprised of SBLCs of $1.60 billion and commercial letters of credit of $55.7 million. The Company uses the same credit underwriting criteria in extending loans, commitments and conditional obligations to customers. Each customer’s creditworthiness is evaluated on a case-by-case basis. Collateral and financial guarantees may be obtained based on management’s assessment of the customer’s credit. Collateral may include cash, accounts receivable, inventory, property, plant and equipment, and income-producing commercial property. Estimated exposure to loss from these commitments is included in the allowance for unfunded credit reserves, and amounted to $12.7 million as of December 31, 2017 and $15.7 million as of December 31, 2016. These amounts are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Guarantees — The Company has sold or securitized loans with recourse in the ordinary course of business. The recourse component in the loans sold or securitized with recourse is considered a guarantee. As the guarantor, the Company is obligated to repurchase up to the recourse component of the loans when the loans default. As of December 31, 2017 and 2016, the unpaid principal balance of total single-family and multifamily residential loans sold or securitized with recourse amounted to $113.7 million and $150.5 million, respectively. The maximum potential future payments up to the recourse component that the Company is obligated to repurchase amounted to $38.7 million and $46.4 million as of December 31, 2017 and 2016, respectively. The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit reserves, totaled $214 thousand and $373 thousand as of December 31, 2017 and 2016, respectively. The allowance for unfunded credit reserves is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. The Company continues to experience minimal losses from the single-family and multifamily residential loan portfolios sold or securitized with recourse during 2017. Lease Commitments — The Company conducts a portion of its operations utilizing leased premises and equipment under operating leases. Rental expense amounted to $29.7 million, $24.1 million and $24.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. Future minimum rental payments under non-cancellable operating leases are estimated as follows:
Years Ending December 31, |  | Amount ($ in thousands)
2018 |  | $ | 31,845 |
2019 |  | 27,005 |
2020 |  | 22,242 |
2021 |  | 18,635 |
2022 |  | 13,944 |
Thereafter |  | 27,988 |
Total |  | $ | 141,659 |
Related Party Transactions — In the ordinary course of business, the Company may enter into transactions with various related parties. The Company’s related party transactions were not material for the years ended December 31, 2017 and 2016. Litigation — The Company is a party to various legal actions arising in the course of its business. In accordance with ASC 450, Contingencies, the Company accrues reserves for outstanding lawsuits, claims and proceedings when a loss contingency is probable and can be reasonably estimated. The Company estimates the amount of loss contingencies using current available information from legal proceedings, advice from legal counsel, and available insurance coverage. Due to the inherent subjectivity of the assessments and unpredictability of the outcomes of the legal proceedings, any amounts accrued or included in this aggregate amount may not represent the ultimate loss to the Company from the legal proceedings in question. Thus, the Company’s exposure and ultimate losses may be higher, and possibly significantly more than the amounts accrued. Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships, tax credit and other investments as discussed in Note 8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements. These commitments are payable on demand. As of December 31, 2017 and 2016, these commitments were $169.2 million and $174.3 million, respectively. These commitments are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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