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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Policies)
6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Basis of Presentation The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP"). The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant inter-company accounts and transactions have been eliminated in consolidation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. Actual results could differ significantly from those estimates. Certain amounts in the financial statements from prior periods have been reclassified to conform to the current financial statement presentation.
Reclassifications Immaterial Restatement: Subsequent to issuance of the June 30, 2020 financial statements, management concluded that purchases of and proceeds from the sale of Federal Home Loan Bank stock were incorrectly classified as financing activities, rather than investing activities, in the consolidated statements of cash flows. To correct this classification error, amounts previously reported for the purchases of and proceeds from the sale of Federal Home Loan Bank stock for the six months ended June 30, 2020 as financing activities are reported as investing activities in the consolidated statement of cash flows.
Recent Accounting Developments
Recent Accounting Developments

In December 2019, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU 2019-12”). ASU 2019-12 removes certain exceptions to the general principles in Topic 740 in GAAP. ASU 2019-12 is effective for public entities for fiscal years beginning after December 15, 2020, with early adoption permitted. The Company adopted this ASU on January 1, 2021 and it did not have a material effect on the Company’s financial position, results of operations or financial statement disclosures.
In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848). This ASU provides optional expedients and exceptions for contracts, hedging relationship, and other transactions that reference LIBOR or other reference rates expected to be discontinued because of reference rate reform. In January 2021, the FASB issued ASU 2021-01, "Reference Rate Reform (Topic 848)," which clarifies certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the transition to alternative rates. The ASUs are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is in the process of evaluating the provisions of these ASUs, but does not expect them to have a material impact on the Company’s financial position, results of operations or financial statement disclosures.
Derivatives and Hedging Activities To reduce the risk of significant interest rate fluctuations on the value of certain assets and liabilities, such as single family mortgage LHFS and MSRs, the Company utilizes derivatives as economic hedges
Fair Value Measurement
The term "fair value" is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The Company's approach is to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements.

Fair Value Hierarchy

A three-level valuation hierarchy has been established under ASC 820 for disclosure of fair value measurements. The valuation hierarchy is based on the observability of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument’s categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The levels are defined as follows:

• Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity
can access at the measurement date. An active market for the asset or liability is a market in which transactions for
the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing
basis.

• Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability,
either directly or indirectly. This includes quoted prices for similar assets and liabilities in active markets and
inputs that are observable for the asset or liability for substantially the full term of the financial instrument.

• Level 3 – Unobservable inputs for the asset or liability. These inputs reflect the Company's assumptions of what
market participants would use in pricing the asset or liability.

The Company's policy regarding transfers between levels of the fair value hierarchy is that all transfers are assumed to occur at the end of the reporting period.                 
Estimation of Fair Value
Fair value is based on quoted market prices, when available. In cases where a quoted price for an asset or liability is not available, the Company uses valuation models to estimate fair value. These models incorporate inputs such as forward yield curves, loan prepayment assumptions, expected loss assumptions, market volatilities and pricing spreads utilizing market-based inputs where readily available. The Company believes its valuation methods are appropriate and consistent with those that would be used by other market participants. However, imprecision in estimating unobservable inputs and other factors may result in these fair value measurements not reflecting the amount realized in an actual sale or transfer of the asset or liability in a current market exchange.
The following table summarizes the fair value measurement methodologies, including significant inputs and assumptions and classification of the Company's assets and liabilities valued at fair value on a recurring basis.
Asset/Liability classValuation methodology, inputs and assumptionsClassification
Investment securities
Investment securities AFSObservable market prices of identical or similar securities are used where available.Level 2 recurring fair value measurement.
If market prices are not readily available, value is based on discounted cash flows using the following significant inputs:
 
•      Expected prepayment speeds 
•      Estimated credit losses 
•      Market liquidity adjustments
Level 3 recurring fair value measurement.
LHFS
Single family loans, excluding loans transferred from held for investment
Fair value is based on observable market data, including:
 
•       Quoted market prices, where available 
•       Dealer quotes for similar loans 
•       Forward sale commitments
Level 2 recurring fair value measurement.
When not derived from observable market inputs, fair value is based on discounted cash flows, which considers the following inputs:
•       Benchmark yield curve  
•       Estimated discount spread to the benchmark yield curve 
•       Expected prepayment speeds
Estimated fair value classified as Level 3.
Mortgage servicing rights
Single family MSRs
For information on how the Company measures the fair value of its single family MSRs, including key economic assumptions and the sensitivity of fair value to changes in those assumptions, see Note 6, Mortgage Banking Operations.
Level 3 recurring fair value measurement.
Derivatives
Eurodollar futuresFair value is based on closing exchange prices.Level 1 recurring fair value measurement.
Interest rate swaps
Interest rate swaptions
Forward sale commitments
Fair value is based on quoted prices for identical or similar instruments, when available. When quoted prices are not available, fair value is based on internally developed modeling techniques, which require the use of multiple observable market inputs including:
 
            •       Forward interest rates 
            •       Interest rate volatilities
Level 2 recurring fair value measurement.
Interest rate lock commitments
The fair value considers several factors including:

•       Fair value of the underlying loan based on quoted prices in the secondary market, when available. 
•       Value of servicing
•       Fall-out factor
Level 3 recurring fair value measurement.