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Fair Value (Tables)
9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which we have elected the fair value option, are summarized below: 
Fair Value Measurements at September 30, 2022 Using
(dollars in thousands)Carrying ValueQuoted Prices in
Active Markets for
Identical Assets (Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Financial Assets    
Equity securities$51,846 $51,846 $ $ 
Investment securities available-for-sale:
U.S. Treasury193,605 193,605   
U.S. government-sponsored entities and agencies1,175,457  1,175,457  
Mortgage-backed securities - Agency4,459,527  4,459,527  
States and political subdivisions675,047  675,047  
Pooled trust preferred securities11,322  11,322  
Other securities348,022  348,022  
Residential loans held for sale19,748  19,748  
Derivative assets148,578  148,578  
Financial Liabilities
Derivative liabilities399,558  399,558  
  Fair Value Measurements at December 31, 2021 Using
(dollars in thousands)Carrying ValueQuoted Prices in
Active Markets for
Identical Assets (Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Financial Assets    
Equity securities$13,211 $13,211 $— $— 
Investment securities available-for-sale:
U.S. Treasury235,584 235,584 — — 
U.S. government-sponsored entities and agencies1,542,773 — 1,542,773 — 
Mortgage-backed securities - Agency3,698,831 — 3,698,831 — 
States and political subdivisions1,654,986 — 1,654,986 — 
Pooled trust preferred securities9,496 — — 9,496 
Other securities240,396 — 240,396 — 
Residential loans held for sale35,458 — 35,458 — 
Derivative assets74,226 — 74,226 — 
Financial Liabilities
Derivative liabilities41,872 — 41,872 — 
Reconciliation of All Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)
The table below presents a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
(dollars in thousands)Pooled Trust
Preferred Securities
Three Months Ended September 30, 2022 
Balance at beginning of period$ 
Accretion of discount 
Increase in fair value of securities 
Balance at end of period$ 
Three Months Ended September 30, 2021
Balance at beginning of period$9,388 
Accretion of discount
Decrease in fair value of securities(25)
Balance at end of period$9,367 
Nine Months Ended September 30, 2022
Balance at beginning of period$9,496 
Accretion of discount12 
Increase in fair value of securities1,593 
Transfers out of Level 3(11,101)
Balance at end of period$ 
Nine Months Ended September 30, 2021
Balance at beginning of period$7,913 
Accretion of discount14 
Sales/payments received(27)
Increase in fair value of securities1,467 
Balance at end of period$9,367 
Schedule of Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements
The table below provides quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy:
(dollars in thousands)Fair ValueValuation TechniquesUnobservable Input
Range (Weighted Average) (4)
December 31, 2021   
Pooled trust preferred securities$9,496 Discounted cash flow
Constant prepayment rate (1)
0.00%
  
Additional asset defaults (2)
5.7% - 8.5% (6.5%)
  
Expected asset recoveries (3)
0.0% - 46.0% (14.1%)
(1)Assuming no prepayments.
(2)Each currently performing pool asset is assigned a default probability based on the banking environment, which is adjusted for specific issuer evaluation, of 0%, 50%, or 100%.
(3)Each currently defaulted pool asset is assigned a recovery probability based on specific issuer evaluation of 0%, 25%, or 100%.
(4)Unobservable inputs are weighted by the estimated number of defaults and current performing collateral of the instruments.
The table below provides quantitative information about significant unobservable inputs used in fair value measurements within Level 3 of the fair value hierarchy:
(dollars in thousands)Fair ValueValuation TechniquesUnobservable Input
Range (Weighted Average) (1)
September 30, 2022    
Collateral Dependent Loans    
Commercial loans$29,500 DiscountedDiscount for type of property,
4% - 32% (22%)
 cash flowage of appraisal, and current status
Commercial real estate loans44,401 DiscountedDiscount for type of property,
1% - 28% (15%)
cash flowage of appraisal, and current status
Foreclosed Assets
Commercial real estate (1)
278 Fair value ofDiscount for type of property,46%
collateralage of appraisal, and current status
December 31, 2021  
Collateral Dependent Loans  
Commercial loans$2,634 DiscountedDiscount for type of property,
14% - 15% (14%)
 cash flowage of appraisal, and current status
Commercial real estate loans16,308 DiscountedDiscount for type of property,
6% - 10% (8%)
 cash flowage of appraisal, and current status
(1)Unobservable inputs were weighted by the relative fair value of the instruments.
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis
Assets measured at fair value at September 30, 2022 on a non-recurring basis are summarized below:
  Fair Value Measurements at September 30, 2022 Using
(dollars in thousands)Carrying
Value
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Collateral Dependent Loans:    
Commercial loans$29,500 $ $ $29,500 
Commercial real estate loans44,401   44,401 
Foreclosed Assets:
Commercial278   278 
Assets measured at fair value at December 31, 2021 on a non-recurring basis are summarized below:
  Fair Value Measurements at December 31, 2021 Using
(dollars in thousands)Carrying ValueQuoted Prices in
Active Markets for
Identical Assets (Level 1)
Significant
Other
Observable
Inputs (Level 2)
Significant
Unobservable
Inputs (Level 3)
Collateral Dependent Loans:    
Commercial loans$2,634 $— $— $2,634 
Commercial real estate loans16,308 — — 16,308 
Loan servicing rights140 — 140 — 
Schedule of Difference Between the Aggregate Fair Value and the Aggregate Remaining Principal Balance
The difference between the aggregate fair value and the aggregate remaining principal balance for loans for which the fair value option has been elected was as follows: 
(dollars in thousands)Aggregate Fair ValueDifference Contractual Principal
September 30, 2022   
Residential loans held for sale$19,748 $(426)$20,174 
December 31, 2021
Residential loans held for sale$35,458 $1,342 $34,116 
The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value:
(dollars in thousands)Other
Gains and (Losses)
Interest IncomeInterest (Expense)Total Changes
in Fair Values
Included in
Current Period Earnings
Three Months Ended September 30, 2022    
Residential loans held for sale$(710)$1 $ $(709)
Three Months Ended September 30, 2021
Residential loans held for sale$(453)$— $(2)$(455)
Nine Months Ended September 30, 2022
Residential loans held for sale$(1,775)$7 $ $(1,768)
Nine Months Ended September 30, 2021
Residential loans held for sale$(2,043)$$(3)$(2,044)
Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value
The carrying amounts and estimated fair values of financial instruments not carried at fair value were as follows: 
  Fair Value Measurements at September 30, 2022 Using
(dollars in thousands)Carrying ValueQuoted Prices in
Active Markets
for Identical
Assets (Level 1)
Significant
Other
Observable
Inputs (Level 2)
Significant
Unobservable
Inputs (Level 3)
Financial Assets    
Cash, due from banks, money market,
   and other interest-earning investments
$801,611 $801,611 $ $ 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies817,489  658,435  
Mortgage-backed securities - Agency1,124,714  1,001,146  
State and political subdivisions1,154,364  940,859  
Loans, net:
Commercial9,197,495   9,093,210 
Commercial real estate12,082,870   11,933,915 
Residential real estate6,246,050   5,689,328 
Consumer credit2,700,264   2,726,540 
Accrued interest receivable166,699 997 42,119 123,583 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$12,400,077 $12,400,077 $ $ 
Checking, NOW, savings, and money market
   interest-bearing deposits
21,182,255 21,182,255   
Time deposits2,471,331  2,426,080  
Federal funds purchased and interbank borrowings301,031 301,031   
Securities sold under agreements to repurchase438,053 438,053   
FHLB advances2,804,617  2,717,824  
Other borrowings721,049  587,370  
Accrued interest payable8,774  8,774  
Standby letters of credit904   904 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$ $ $ $3,708 
  Fair Value Measurements at December 31, 2021 Using
(dollars in thousands)Carrying ValueQuoted Prices in
Active Markets
for Identical
Assets (Level 1)
Significant
Other
Observable
Inputs (Level 2)
Significant
Unobservable
Inputs (Level 3)
Financial Assets    
Cash, due from banks, money market,
   and other interest-earning investments
$822,019 $822,019 $— $— 
Loans, net:
Commercial3,363,175 — — 3,335,009 
Commercial real estate6,315,574 — — 6,211,854 
Residential real estate2,245,942 — — 2,216,900 
Consumer credit1,569,814 — — 1,582,600 
Accrued interest receivable84,109 688 35,790 47,631 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$6,303,106 $6,303,106 $— $— 
Checking, NOW, savings, and money market
   interest-bearing deposits
11,305,676 11,305,676 — — 
Time deposits960,413 — 968,658 — 
Federal funds purchased and interbank borrowings276 276 — — 
Securities sold under agreements to repurchase392,275 392,275 — — 
FHLB advances1,886,019 — 1,935,140 — 
Other borrowings296,670 — 311,532 — 
Accrued interest payable5,496 — 5,496 — 
Standby letters of credit454 — — 454 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$— $— $— $4,678