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Disclosures About Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Financial Instruments
The estimated fair values of Customers' financial instruments at June 30, 2023 and December 31, 2022 were as follows:
   Fair Value Measurements at June 30, 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$3,155,224 $3,155,224 $3,155,224 $— $— 
Debt securities, available for sale2,797,940 2,797,940 — 2,746,115 51,825 
Debt securities, held to maturity1,258,560 1,212,248 — 497,814 714,434 
Loans held for sale78,108 78,108 — 1,234 76,874 
Total loans and leases receivable, net of allowance for credit losses on loans and leases13,693,143 13,298,144 — 1,006,268 12,291,876 
FHLB, Federal Reserve Bank, and other restricted stock126,240 126,240 — 126,240 — 
Derivatives26,003 26,003 — 25,937 66 
Liabilities:
Deposits$17,950,431 $17,923,322 $13,093,728 $4,829,594 $— 
FHLB advances2,046,142 2,029,664 — 2,029,664 — 
Other borrowings123,710 100,666 — 100,666 — 
Subordinated debt182,091 148,371 — 148,371 — 
Derivatives37,662 37,662 — 37,662 — 

   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 $— 
FHLB advances800,000 781,113 — 781,113 — 
Other borrowings123,580 108,081 — 108,081 — 
Subordinated debt181,952 168,441 — 168,441 — 
Derivatives42,106 42,106 — 42,106 — 
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis For financial assets and liabilities measured at fair value on a recurring and nonrecurring basis, the fair value measurements by level within the fair value hierarchy used at June 30, 2023 and December 31, 2022 were as follows:
 June 30, 2023
 Fair Value Measurements at the End of the Reporting Period Using
(amounts in thousands)Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Total
Measured at Fair Value on a Recurring Basis:
Assets
Available for sale debt securities:
Asset-backed securities$— $74,712 $51,825 $126,537 
Agency-guaranteed residential collateralized mortgage obligations— 125,308 — 125,308 
Collateralized loan obligations— 831,253 — 831,253 
Commercial mortgage-backed securities— 132,474 — 132,474 
Corporate notes— 579,751 — 579,751 
Private label collateralized mortgage obligations— 1,002,617 — 1,002,617 
Derivatives— 25,937 66 26,003 
Loans held for sale – fair value option— 1,234 — 1,234 
Loans receivable, mortgage warehouse – fair value option— 1,006,268 — 1,006,268 
Total assets – recurring fair value measurements$— $3,779,554 $51,891 $3,831,445 
Liabilities
Derivatives $— $37,662 $— $37,662 
Measured at Fair Value on a Nonrecurring Basis:
Assets
Collateral-dependent loans$— $— $2,375 $2,375 
Total assets – nonrecurring fair value measurements$— $— $2,375 $2,375 
 December 31, 2022
 Fair Value Measurements at the End of the Reporting Period Using
(amounts in thousands)Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Total
Measured at Fair Value on a Recurring Basis:
Assets
Available for sale debt securities:
Asset-backed securities$— $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 and six months ended June 30, 2023 and 2022 are summarized in the table below.
Asset-backed securities
(amounts in thousands)Three Months Ended June 30,
20232022
Balance at April 1$63,376 $121,853 
Principal payments and premium amortization(10,444)(18,147)
Increase in allowance for credit losses(773)— 
Decrease in allowance for credit losses— 317 
Change in fair value recognized in OCI(334)2,896 
Balance at June 30$51,825 $106,919 
Asset-backed securities
(amounts in thousands)Six Months Ended June 30,
20232022
Balance at January 1$73,266 $142,885 
Principal payments and premium amortization(21,660)(34,496)
Increase in allowance for credit losses(1,046)(411)
Decrease in allowance for credit losses61 — 
Change in fair value recognized in OCI1,204 (1,059)
Balance at June 30$51,825 $106,919 
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 June 30, 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)
June 30, 2023    
Asset-backed securities$51,825 Discounted cash flowDiscount rate


Annualized loss rate


Constant prepayment rate
9% - 10%
(10%)

3% - 6%
(5%)

15% - 28%
(25%)

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%)