Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of useful lives for premises and equipment

The ranges of estimated useful lives for the principal classes of assets are as follows:

Premises and Equipment	Useful Lives
Buildings and building improvements	25 years
Furniture, fixtures and equipment	3 to 7 years
Leasehold improvements	Term of lease or useful life, whichever is shorter

Schedule of new accounting pronouncements adopted and recent accounting pronouncements

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Adopted in 2018 (continued)
ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	January 1, 2018 Early adoption is not permitted, except for certain provisions discussed in the “Description” column.	The guidance amends ASC Topic 825, Financial Instruments—Overall, and requires investments in marketable equity securities, except for those accounted for under the equity method of accounting or consolidated, to be accounted for at fair value through net income. The guidance also provides a measurement alternative for equity securities without readily determinable fair values to be measured at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer. Such price changes (if any) are reflected in earnings beginning in the period of adoption. The guidance also requires fair value changes arising from changes in instrument-specific credit risk for financial liabilities that are measured under the fair value option to be recognized in other comprehensive income in which early adoption is permitted for this requirement, and the use of exit price to measure the fair value of financial instruments for disclosure purposes. In addition, the guidance eliminates the requirement to disclose methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost on the Consolidated Balance Sheet.	On January 1, 2018, with the exception of the amendments related to equity investments without readily determinable fair values and the use of exit price to measure the fair value of financial instruments for disclosure purposes that were adopted prospectively, the Company adopted all other amendments of the standard on a modified retrospective basis. As of the date of adoption, the Company reclassified approximately $31.9 million of marketable equity securities that were previously classified as Available-for-sale investment securities, at fair value to Investments in tax credits and other investments, net. In addition, the Company recorded a cumulative-effect adjustment that reduced retained earnings by $545 thousand and increased AOCI by $385 thousand as of January 1, 2018. The Company elected the measurement alternative for its privately held cost method investments, which was not a material amount. The Company’s investments in the Federal Reserve Bank of San Francisco ("FRB") and FHLB stock are not subject to this guidance and continue to be accounted for at cost. Furthermore, for purposes of disclosing the fair value of financial instruments carried at amortized cost, the Company has updated its valuation methods as necessary to conform to an exit price concept as required by the guidance as of January 1, 2018. The remaining provisions and disclosure requirements of this ASU did not have a material impact on the Company’s Consolidated Financial Statements or related disclosures.
ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments	January 1, 2018 Early adoption is permitted	This ASU amends ASC Topic 230, Statement of Cash Flows, and provides guidance on eight specific issues related to classification on the Consolidated Statement of Cash Flows. The specific issues cover cash payments for debt prepayment or debt extinguishment costs; cash outflows for settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowings; contingent consideration payments that are not made soon after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; and beneficial interests received in securitization transactions. The guidance also clarifies that in instances of cash flows with multiple aspects that cannot be separately identified, the classification should be based on the activity that is likely to be the predominant source or use of the cash flows.	The Company adopted this guidance on a retrospective basis on January 1, 2018. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Adopted in 2018 (continued)
ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash	January 1, 2018 Early adoption is permitted.	This ASU amends ASC Topic 230, Statement of Cash Flows, and requires those amounts that are deemed to be restricted cash and restricted cash equivalents to be included in cash and cash equivalents balances on the Consolidated Statement of Cash Flows. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Consolidated Statement of Cash Flows. The nature of any restrictions are required to be disclosed in the footnotes to the Consolidated Financial Statements.	The Company adopted this guidance on a retrospective basis on January 1, 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements.
ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business	January 1, 2018 Early adoption is permitted.	This ASU amends ASC Topic 805, Business Combinations, and narrows the definition of a business by adding an initial screen to determine if substantially all of the fair value of the gross assets acquired is concentrated in a single asset or group of similar assets (a “set”). If the screen is met, the set is not a business. This ASU also specifies the minimum inputs and processes required for a set to be considered a business, and it removes the requirement to evaluate a market participant’s ability to replace missing elements when all of the inputs or processes that the seller used in operating a business were not obtained.	The Company adopted this guidance prospectively on January 1, 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements.
ASU 2017-08, Receivables — Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities	January 1, 2019 Early adoption is permitted.	This ASU amends ASC Subtopic 310-20, Receivables — Nonrefundable Fees and Other Costs, by shorteningthe amortization period for certain purchased callable debt securities held at a premium to the earliest call date. The guidance does not require any accounting changes for debt securities held at a discount. The discount continues to be amortized as an adjustment of yield over the contractual life (to maturity) of the instrument. The guidance should be applied using a modified retrospective transition method, with the cumulative-effect adjustment recognized to retained earnings as of the beginning of the period of adoption.	The Company early adopted this guidance on January 1, 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements since the accounting on the Company’s purchased callable debt securities have been consistent with the requirements of ASU 2017-08.
ASU 2017-09, Compensation — Stock Compensation (Topic 718): Scope of Modification Accounting	January 1, 2018 Early adoption is permitted.	This ASU amends ASC Topic 718, Compensation — Stock Compensation, and provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification.	The Company adopted the guidance prospectively on January 1, 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements.
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	January 1, 2019 Early adoption is permitted.	This ASU amends ASC Topic 815, Derivatives and Hedging, to simplify the application of hedge accounting and to better align the Company’s financial reporting of its hedging relationship with its risk management activities. Certain key changes include: eliminating the requirement to separately measure and report hedge ineffectiveness for cash flow and net investment hedges; expands and refines hedge accounting for both nonfinancial and financial risk components, and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item on the Consolidated Financial Statements. In addition, incremental disclosure requirements are required.	The Company early adopted this guidance on January 1, 2018. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	January 1, 2019 Early adoption is permitted	This ASU amends ASC Topic 220, Income Statement — Reporting Comprehensive Income. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Under current GAAP, deferred tax assets and liabilities are to be adjusted for the effect of a change in tax laws or rates in net income of the reporting period that includes the enactment date. This accounting treatment resulted in the tax effect of items within AOCI not reflecting the appropriate tax rate. This guidance permits companies to reclassify the stranded tax effects resulting from the Tax Act from AOCI to retained earnings.	The Company early adopted this guidance retrospectively on January 1, 2018. The Company has identified the unrealized losses for available-for-sale securities to be the only item in AOCI with stranded tax effects, and made a policy election to reclassify the related stranded tax effects using the “investment-by-investment” approach. The adoption of this guidance resulted in a cumulative-effect adjustment as of January 1, 2018 that increased retained earnings by $6.7 million and reduced AOCI by the same amount.

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Adopted in 2018 (continued)
ASU 2018-13, Fair Value Measurement (Topic 820): Disclosures Framework — Changes to the Disclosure Requirements for Fair Value Measurement	January 1, 2020 Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures and delay adoption of the additional disclosures until their effective dates.	This ASU amends ASC Topic 820, Fair Value Measurements to add new fair value measurement disclosure requirements, as well as to modify and remove certain disclosure requirements. The new disclosure requirements include disclosing 1) the changes in unrealized gains or losses recorded in other comprehensive income for recurring Level 3 fair value measurements; and 2) the range and weighted-average used to develop significant unobservable inputs in determining the fair value of Level 3 assets and liabilities, and how the weighted-average unobservable inputs were calculated. This ASU removes the requirement to disclose 1) the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; 2) policy for the timing of transfers between levels of the fair value hierarchy; and 3) valuation processes for level 3 fair value measurements. The new disclosure requirements should be adopted prospectively, while all other amendments should be applied retrospectively.	The Company early adopted this guidance as of December 31, 2018 for all applicable provisions. The adoption of this ASU did not have a material impact on the Company’s Consolidated Financial Statements. See Note 3 — Fair Value Measurements and Fair Value of Financial Instruments to the Consolidated Financial Statements for the Company’s fair value disclosures.

Recent Accounting Pronouncements

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Not Yet Adopted
ASU 2016-02, Leases (Topic 842) and subsequent related ASUs	January 1, 2019 Early adoption is permitted	The ASU creates ASC Topic 842, Leases, which supersedes ASC Topic 840, Leases. This ASU requires lessees to recognize right-of-use assets and related lease liabilities for all leases with lease terms of more than 12 months on the Consolidated Balance Sheet, and provide quantitative and qualitative disclosures regarding key information about the leasing arrangements. For short-term leases with a term of 12 months or less, lessees can make a policy election not to recognize lease assets and lease liabilities. Lessor accounting is largely unchanged. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements, which provides companies the option to continue to apply the legacy guidance in ASC 840, Leases, including its disclosure requirements, in the comparative periods presented in the year they adopt ASU 2016-02. Companies that elect this transition option recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption rather than in the earliest period presented. In December 2018, the FASB issued ASU 2018-20, Leases (Topic 842) Narrow-Scope Improvements for Lessors, which include amendments related to 1) sale taxes and other similar taxes collected from lessees; 2) lessor costs paid directly by a lessee; and 3) the recognition of variable payments for contracts with lease and nonlease components.	The Company expects to adopt ASU 2016-02 on January 1, 2019 using the optional transition method with a cumulative-effect adjustment to retained earnings without restating prior period financial statements for comparable amounts. The Company has completed its implementation efforts as of December 31, 2018. Based on current estimates, the Company expects to recognize right-of-use lease assets of approximately $114.6 million and lease liabilities of approximately $120.4 million at the date of adoption, based on the present value of the expected remaining lease payments. At adoption, the Company expects to have a cumulative effect adjustment of approximately $14.7 million to increase retained earnings related to deferred gains on sale and leaseback transactions. The Company does not expect material changes to the recognition of operating lease expense on its Consolidated Statement of Income. The Company does not expect the adoption of ASU 2018-20 to have a material impact on the Company’s Consolidated Financial Statements.

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Not Yet Adopted (continued)
ASU 2018-09, Codification Improvements	Amendments that do not require transition guidance: effective immediately upon issuance in July, 2018. Amendments that require transition guidance: January 1, 2019	This ASU makes improvements to various Codification Topics. Some of the improvements include: 1) clarifying that the excess tax benefits for share-based compensation awards should be recognized in the period in which the amount of the deduction is determined; 2) one of the criteria “the intent to set off” under ASC 210-20-45-1 is not required to offset derivative assets and liabilities for certain amounts arising from derivative instruments recognized at fair value and executed with the same counterparty under a master netting agreement; and 3) clarifying the measurement of certain financial instruments.	For the amendments that are effective immediately upon issuance of this guidance, there is no material impact on the Company’s Consolidated Financial Statements. For amendments that are effective on January 1, 2019, the Company does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements.
ASU 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (“SOFR”) Overnight Index Swap (“OIS”) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes	January 1, 2019. Early adoption (including adoption in an interim period) is permitted for entities that already adopted ASU 2017-12.	This ASU amends ASC Topic 815, Derivatives and Hedging, by adding the OIS rate based on SOFR to the list of U.S. benchmark interest rates that are eligible to be hedged to facilitate the London Interbank Offered Rate (“LIBOR”) to SOFR transition. The guidance should be applied prospectively for qualifying new or redesignated hedging relationships entered into on or after the date of adoption.	Given that the Company has early adopted ASU 2017-12, ASU 2018-16 will be adopted on January 1, 2019. The Company does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements.
ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	January 1, 2020. Early adoption is permitted on January 1, 2019.	The ASU introduces a new current expected credit loss (“CECL”) impairment model that applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loan receivables, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. This ASU also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption.	While the Company is still evaluating the impact on its Consolidated Financial Statements, the Company expects that this ASU may result in an increase in the allowance for credit losses due to the following factors: 1) the allowance for credit losses provides for expected credit losses over the remaining expected life of the loan portfolio, and will consider expected future changes in macroeconomic conditions; 2) the nonaccretable difference on the PCI loans will be recognized as an allowance, offset by an increase in the carrying value of the PCI loans; and 3) an allowance may be established for estimated credit losses on available-for-sale debt securities. The Company’s implementation efforts include, but are not limited to, identifying key interpretive issues, assessing its processes, identifying the system requirements against the new guidance to determine what modifications may be required. The Company has evaluated portfolio segments and model methodologies including macroeconomic factors and is initiating evaluation of qualitative factors. The Company expects to adopt this ASU on January 1, 2020.

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Not Yet Adopted (continued)
ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	January 1, 2020 Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017.	The ASU simplifies the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. This guidance should be applied prospectively.	The Company does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements. The Company expects to adopt this ASU on January 1, 2020.
ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract	January 1, 2020 Early adoption is permitted.	The ASU amends ASC Topic 350-40 to align the accounting for costs incurred in a cloud computing arrangement with the guidance on developing internal use software. Specifically, if a cloud computing arrangement is deemed to be a service contract, certain implementation costs are eligible for capitalization. The new guidance prescribes the balance sheet and income statement presentation and cash flow classification for the capitalized costs and related amortization expense. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption.	The Company does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements. The Company expects to adopt this ASU on January 1, 2020.