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Disclosures About Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The estimated fair values of Customers' financial instruments at March 31, 2023 and December 31, 2022 were as follows:
   Fair Value Measurements at March 31, 2023
(amounts in thousands)Carrying AmountEstimated Fair ValueQuoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Assets:
Cash and cash equivalents$2,046,685 $2,046,685 $2,046,685 $— $— 
Debt securities, available for sale2,900,259 2,900,259 — 2,836,883 63,376 
Debt securities, held to maturity870,294 836,713 — 516,978 319,735 
Loans held for sale424,057 424,057 — 16,314 407,743 
Total loans and leases receivable, net of allowance for credit losses on loans and leases14,508,696 13,973,288 — 1,247,367 12,725,921 
FHLB, Federal Reserve Bank, and other restricted stock124,733 124,733 — 124,733 — 
Derivatives34,751 34,751 — 34,686 65 
Liabilities:
Deposits$17,723,617 $17,707,705 $12,222,811 $5,484,894 $— 
FHLB advances2,052,143 2,047,365 — 2,047,365 — 
Other borrowings123,645 108,381 — 108,381 — 
Subordinated debt182,021 152,769 — 152,769 — 
Derivatives32,999 32,999 — 32,999 — 

   Fair Value Measurements at December 31, 2022
(amounts in thousands)Carrying AmountEstimated Fair ValueQuoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Assets:
Cash and cash equivalents$455,806 $455,806 $455,806 $— $— 
Debt securities, available for sale2,961,015 2,961,015 — 2,887,749 73,266 
Debt securities, held to maturity840,259 793,813 — 437,680 356,133 
Loans held for sale328,312 328,312 — 322 327,990 
Total loans and leases receivable, net of allowance for credit losses on loans and leases15,335,435 14,890,823 — 1,323,312 13,567,511 
FHLB, Federal Reserve Bank, and other restricted stock74,196 74,196 — 74,196 — 
Derivatives44,435 44,435 — 44,380 55 
Liabilities:
Deposits$18,156,953 $18,127,338 $13,907,087 $4,220,251 $— 
FHLB advances800,000 781,113 — 781,113 — 
Other borrowings123,580 108,081 — 108,081 — 
Subordinated debt181,952 168,441 — 168,441 — 
Derivatives42,106 42,106 — 42,106 — 
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis For financial assets and liabilities measured at fair value on a recurring and nonrecurring basis, the fair value measurements by level within the fair value hierarchy used at March 31, 2023 and December 31, 2022 were as follows:
 March 31, 2023
 Fair Value Measurements at the End of the Reporting Period Using
(amounts in thousands)Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Total
Measured at Fair Value on a Recurring Basis:
Assets
Available for sale debt securities:
Asset-backed securities$— $84,559 $63,376 $147,935 
Agency-guaranteed residential collateralized mortgage obligations— 133,753 — 133,753 
Collateralized loan obligations— 854,100 — 854,100 
Commercial mortgage-backed securities— 136,818 — 136,818 
Corporate notes— 586,795 — 586,795 
Private label collateralized mortgage obligations— 1,040,858 — 1,040,858 
Derivatives— 34,686 65 34,751 
Loans held for sale – fair value option— 314 — 314 
Loans receivable, mortgage warehouse – fair value option— 1,247,367 — 1,247,367 
Total assets – recurring fair value measurements$— $4,119,250 $63,441 $4,182,691 
Liabilities
Derivatives $— $32,999 $— $32,999 
Measured at Fair Value on a Nonrecurring Basis:
Assets
Collateral-dependent loans$— $16,000 $6,569 $22,569 
Total assets – nonrecurring fair value measurements$— $16,000 $6,569 $22,569 
 December 31, 2022
 Fair Value Measurements at the End of the Reporting Period Using
(amounts in thousands)Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Total
Measured at Fair Value on a Recurring Basis:
Assets
Available for sale debt securities:
Asset-backed securities$— $87,276 $73,266 $160,542 
Agency-guaranteed residential collateralized mortgage obligations— 133,864 — 133,864 
Collateralized loan obligations— 872,738 — 872,738 
Commercial mortgage-backed securities— 136,357 — 136,357 
Corporate notes— 595,253 — 595,253 
Private label collateralized mortgage obligations— 1,062,261 — 1,062,261 
Derivatives — 44,380 55 44,435 
Loans held for sale – fair value option— 322 — 322 
Loans receivable, mortgage warehouse – fair value option— 1,323,312 — 1,323,312 
Total assets – recurring fair value measurements$— $4,255,763 $73,321 $4,329,084 
Liabilities
Derivatives $— $42,106 $— $42,106 
Measured at Fair Value on a Nonrecurring Basis:
Assets
Collateral-dependent loans$— $— $4,819 $4,819 
Total assets – nonrecurring fair value measurements$— $— $4,819 $4,819 
Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis The changes in asset-backed securities (Level 3 assets) measured at fair value on a recurring basis for the three months ended March 31, 2023 and 2022 are summarized in the table below.
Asset-backed securities
(amounts in thousands)Three Months Ended March 31,
20232022
Balance at January 1,$73,266 $142,885 
Principal payments and premium amortization(11,216)(16,349)
Increase in allowance for credit losses(273)(728)
Decrease in allowance for credit losses61 — 
Change in fair value recognized in OCI1,538 (3,955)
Balance at March 31,$63,376 $121,853 
Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis
The following tables summarize financial assets and financial liabilities measured at fair value as of March 31, 2023 and December 31, 2022 on a recurring and nonrecurring basis for which Customers utilized Level 3 inputs to measure fair value. The unobservable Level 3 inputs noted below contain a level of uncertainty that may differ from what is realized in an immediate settlement of the assets. Therefore, Customers may realize a value higher or lower than the current estimated fair value of the assets.
Quantitative Information about Level 3 Fair Value Measurements
(dollars in thousands)Fair Value
Estimate
Valuation TechniqueUnobservable InputRange 
(Weighted Average)
March 31, 2023    
Asset-backed securities$63,376 Discounted cash flowDiscount rate


Annualized loss rate


Constant prepayment rate
9% - 9%
(9%)

4% - 5%
(4%)

17% - 27%
(24%)

Quantitative Information about Level 3 Fair Value Measurements
(dollars in thousands)Fair Value
Estimate
Valuation TechniqueUnobservable InputRange 
(Weighted Average)
December 31, 2022    
Asset-backed securities$73,266 Discounted cash flowDiscount rate


Annualized loss rate


Constant prepayment rate
9% - 9%
(9%)

4% - 5%
(5%)

19% - 25%
(23%)