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Estimated Fair Values (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Estimated Fair Values For Certain Financial Assets And Financial Liabilities
The table presents the carrying values and estimated fair values for financial instruments as of March 31, 2021 and December 31, 2020:
(Dollars in thousands)March 31, 2021December 31, 2020
Carrying valueFair valueCarrying valueFair value
Assets
Cash and due from banks$410,495 $410,495 $362,048 $362,048 
Overnight investments7,588,757 7,588,757 4,347,336 4,347,336 
Investment in marketable equity securities106,886 106,886 91,680 91,680 
Investment securities available for sale7,307,122 7,307,122 7,014,243 7,014,243 
Investment securities held to maturity2,808,099 2,774,982 2,816,982 2,838,499 
Loans held for sale129,334 129,334 124,837 124,837 
Net loans and leases32,970,200 33,202,437 32,567,661 33,298,166 
Income earned not collected148,022 148,022 145,694 145,694 
Federal Home Loan Bank stock40,563 40,563 45,392 45,392 
Mortgage and other servicing rights23,728 24,322 19,628 20,283 
Liabilities
Deposits with no stated maturity44,601,552 44,601,552 40,542,596 40,542,596 
Time deposits2,729,445 2,738,244 2,889,013 2,905,577 
Securities sold under customer repurchase agreements680,705 680,705 641,487 641,487 
Federal Home Loan Bank borrowings648,671 664,996 655,175 677,579 
Subordinated debt497,153 517,091 504,518 525,610 
Other borrowings84,502 85,067 88,470 89,263 
FDIC shared-loss payable— — 15,601 15,843 
Accrued interest payable5,149 5,149 9,414 9,414 
Assets And Liabilities Carried At Fair Value On A Recurring Basis
For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of March 31, 2021 and December 31, 2020:
March 31, 2021
  Fair value measurements using:
(Dollars in thousands)Fair valueLevel 1 inputsLevel 2 inputsLevel 3 inputs
Assets measured at fair value
Investment securities available for sale
Government agency$846,686 $— $846,686 $— 
Residential mortgage-backed securities4,758,589 — 4,758,589 — 
Commercial mortgage-backed securities1,098,987 — 1,098,987 — 
Corporate bonds602,860 — 284,744 318,116 
Total investment securities available for sale$7,307,122 $— $6,989,006 $318,116 
Marketable equity securities$106,886 $43,677 $63,209 $— 
Loans held for sale$129,334 $— $129,334 $— 
December 31, 2020
 Fair value measurements using:
Fair valueLevel 1 inputsLevel 2 inputsLevel 3 inputs
Assets measured at fair value
Investment securities available for sale
U.S. Treasury$499,933 $— $499,933 $— 
Government agency701,391 — 701,391 — 
Residential mortgage-backed securities4,438,103 — 4,438,103 — 
Commercial mortgage-backed securities771,537 — 771,537 — 
Corporate bonds603,279 — 286,655 316,624 
Total investment securities available for sale$7,014,243 $— $6,697,619 $316,624 
Marketable equity securities$91,680 $32,855 $58,825 $— 
Loans held for sale$124,837 $— $124,837 $— 
Fair Value of Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
The following tables summarize activity for Level 3 assets:
Corporate bonds
Three months ended March 31
(Dollars in thousands)20212020
Beginning balance$316,624 $69,685 
Unrealized net losses (gains) included in other comprehensive income2,333 (4,366)
Amounts included in net income(91)(85)
Transfers in— 1,782 
Sales / Calls(750)— 
Ending balance$318,116 $67,016 
Fair Value Level 3 Significant Unobservable Input Assumptions
(Dollars in thousands)March 31, 2021
Level 3 assetsValuation techniqueSignificant unobservable inputFair Value
Corporate bondsIndicative bid provided by brokerMultiple factors, including but not limited to, current operations, financial condition, cash flows, and recently executed financing transactions related to the issuer$318,116 
Fair Value Option
The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for residential real estate originated for sale measured at fair value as of March 31, 2021 and December 31, 2020:
March 31, 2021
(Dollars in thousands)Fair valueAggregate unpaid principal balanceDifference
Originated loans held for sale$129,334 $126,113 $3,221 
December 31, 2020
Fair valueAggregate unpaid principal balanceDifference
Originated loans held for sale$124,837 $118,902 $5,935 
No originated loans held for sale were 90 or more days past due or on nonaccrual status as of March 31, 2021 or December 31, 2020.
We may be required to measure certain financial assets at fair value on a nonrecurring basis. These adjustments to fair value usually result from the application of lower of amortized cost or fair value accounting or write-downs of individual assets due to impairment.
The population of loans measured at fair value on a non-recurring basis is limited to collateral-dependent loans evaluated individually. These collateral-dependent loans are deemed to be at fair value if there is an associated ACL or if a charge-off has been recorded in the previous 12 months. Collateral values are determined using appraisals or other third-party value estimates of the subject property discounted based on estimated selling costs, generally between 6% and 10%, and immaterial adjustments for other external factors that may impact the marketability of the collateral. The weighted average discount for estimated selling costs applied was 6.81%.
OREO acquired or written down within the previous 12 months is deemed to be at fair value. Asset valuations are determined by using appraisals or other third-party value estimates of the subject property with discounts generally between 6% and 15% applied for estimated selling costs and other external factors that may impact the marketability of the property. At March 31, 2021, the weighted average discount applied was 8.76%. Changes to the value of the assets between scheduled valuation dates are monitored through continued communication with brokers and monthly reviews by the asset manager assigned to each asset. If there are any significant changes in the market or the subject property, valuations are adjusted or new appraisals ordered to ensure the reported values reflect the most current information.
Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis
For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of March 31, 2021 and December 31, 2020:
March 31, 2021
  Fair value measurements using:
(Dollars in thousands)Fair valueLevel 1 inputsLevel 2 inputsLevel 3 inputs
Collateral-dependent loans$10,247 $— $— $10,247 
Other real estate owned36,642 — — 36,642 
Mortgage servicing rights20,409 — — 20,409 
December 31, 2020
 Fair value measurements using:
Fair valueLevel 1 inputsLevel 2 inputsLevel 3 inputs
Collateral-dependent loans$11,779 $— $— $11,779 
Other real estate owned40,115 — — 40,115 
Mortgage servicing rights16,966 — — 16,966