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Fair Value (Tables)
9 Months Ended
Sep. 30, 2023
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, 2023 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$69,880 $69,880 $ $ 
Investment securities available-for-sale:
U.S. Treasury548,126 548,126   
U.S. government-sponsored entities and agencies1,142,900  1,142,900  
Mortgage-backed securities - Agency3,862,705  3,862,705  
States and political subdivisions544,944  544,944  
Pooled trust preferred securities11,125  11,125  
Other securities304,961  304,961  
Loans held-for-sale122,033  122,033  
Derivative assets227,833  227,833  
Financial Liabilities
Derivative liabilities409,269  409,269  
  Fair Value Measurements at December 31, 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$52,507 $52,507 $— $— 
Investment securities available-for-sale:
U.S. Treasury200,927 200,927 — — 
U.S. government-sponsored entities and agencies1,175,080 — 1,175,080 — 
Mortgage-backed securities - Agency4,369,902 — 4,369,902 — 
States and political subdivisions663,852 — 663,852 — 
Pooled trust preferred securities10,811 — 10,811 — 
Other securities353,140 — 353,140 — 
Loans held-for-sale11,926 — 11,926 — 
Derivative assets169,001 — 169,001 — 
Financial Liabilities
Derivative liabilities380,704 — 380,704 — 
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis
Assets measured at fair value at September 30, 2023 on a non-recurring basis are summarized below:
  Fair Value Measurements at September 30, 2023 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$10,783 $ $ $10,783 
Commercial real estate loans75,720   75,720 
Foreclosed Assets:
Commercial1,879   1,879 
Assets measured at fair value at December 31, 2022 on a non-recurring basis are summarized below:
  Fair Value Measurements at December 31, 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)
Collateral Dependent Loans:    
Commercial loans$22,562 $— $— $22,562 
Commercial real estate loans48,026 — — 48,026 
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) (1)
September 30, 2023    
Collateral Dependent Loans    
Commercial loans$10,783 DiscountedDiscount for type of property,
10% - 40% (33%)
 cash flowage of appraisal, and current status
Commercial real estate loans75,720 DiscountedDiscount for type of property,
1% - 38% (17%)
cash flowage of appraisal, and current status
Foreclosed Assets
Commercial real estate1,879 Fair value ofDiscount for type of property,
4% - 17% (6%)
collateralage of appraisal, and current status
December 31, 2022  
Collateral Dependent Loans  
Commercial loans$22,562 DiscountedDiscount for type of property,
10% - 47% (28%)
 cash flowage of appraisal, and current status
Commercial real estate loans48,026 DiscountedDiscount for type of property,
1% - 26% (11%)
 cash flowage of appraisal, and current status
(1)Unobservable inputs were weighted by the relative fair value of the instruments.
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, 2023   
Loans held-for-sale$122,033 $72 $121,961 
December 31, 2022
Loans held-for-sale$11,926 $221 $11,705 
The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value:
(dollars in thousands)Other
Gains and (Losses)
Interest IncomeInterest (Expense)Total Changes
in Fair Values
Included in
Current Period Earnings
Three Months Ended September 30, 2023    
Loans held-for-sale$(327)$12 $ $(315)
Three Months Ended September 30, 2022
Loans held-for-sale$(710)$$— $(709)
Nine Months Ended September 30, 2023
Loans held-for-sale$(151)$2 $ $(149)
Nine Months Ended September 30, 2022
Loans held-for-sale$(1,775)$$— $(1,768)
Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value
The carrying amounts and estimated exit price fair values of financial instruments not carried at fair value were as follows: 
  Fair Value Measurements at September 30, 2023 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
$1,663,430 $1,663,430 $ $ 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies824,223  617,010  
Mortgage-backed securities - Agency1,043,585  847,652  
State and political subdivisions1,160,106  928,959  
Loans, net:
Commercial9,207,028   9,078,129 
Commercial real estate13,770,202   13,302,502 
Residential real estate6,675,508   5,630,855 
Consumer credit2,621,114   2,526,277 
Accrued interest receivable209,503 1,093 45,597 162,813 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$10,091,352 $10,091,352 $ $ 
Checking, NOW, savings, and money market
   interest-bearing deposits
21,585,620 21,585,620   
Time deposits5,575,704  5,527,361  
Federal funds purchased and interbank borrowings918 918   
Securities sold under agreements to repurchase279,061 279,061   
FHLB advances4,412,576  4,167,911  
Other borrowings863,455  843,629  
Accrued interest payable46,934  46,934  
Standby letters of credit1,224   1,224 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$ $ $ $3,582 
  Fair Value Measurements at December 31, 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
$728,412 $728,412 $— $— 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies819,168 — 656,358 — 
Mortgage-backed securities - Agency1,106,817 — 982,963 — 
State and political subdivisions1,163,162 — 1,004,361 — 
Loans, net:
Commercial9,386,862 — — 9,066,583 
Commercial real estate12,317,825 — — 11,867,851 
Residential real estate6,438,525 — — 5,372,491 
Consumer credit2,676,758 — — 2,557,115 
Accrued interest receivable190,521 758 52,081 137,682 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$11,930,798 $11,930,798 $— $— 
Checking, NOW, savings, and money market
   interest-bearing deposits
20,056,252 20,056,252 — — 
Time deposits3,013,780 — 2,976,389 — 
Federal funds purchased and interbank borrowings581,489 581,489 — — 
Securities sold under agreements to repurchase432,804 432,804 — — 
FHLB advances3,829,018 — 3,739,780 — 
Other borrowings743,003 — 703,156 — 
Accrued interest payable19,547 — 19,547 — 
Standby letters of credit755 — — 755 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$— $— $— $3,666