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Fair Value (Tables)
6 Months Ended
Jun. 30, 2025
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 June 30, 2025 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$121,025 $121,025 $ $ 
Investment securities available-for-sale:
U.S. Treasury261,292 261,292   
U.S. government-sponsored entities and agencies1,347,779  1,347,779  
Mortgage-backed securities - Agency8,690,742  8,690,742  
States and political subdivisions441,880  441,880  
Pooled trust preferred securities11,319  11,319  
Other securities252,184  252,184  
Loans held-for-sale77,618  77,618  
Derivative assets178,064  178,064  
Financial Liabilities
Derivative liabilities288,689  288,689  
  Fair Value Measurements at December 31, 2024 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$91,996 $91,996 $— $— 
Investment securities available-for-sale:
U.S. Treasury199,013 199,013 — — 
U.S. government-sponsored entities and agencies1,257,906 — 1,257,906 — 
Mortgage-backed securities - Agency5,204,891 — 5,204,891 — 
States and political subdivisions485,544 — 485,544 — 
Pooled trust preferred securities11,322 — 11,322 — 
Other securities299,783 — 299,783 — 
Loans held-for-sale34,483 — 34,483 — 
Derivative assets146,478 — 146,478 — 
Financial Liabilities
Derivative liabilities244,313 — 244,313 — 
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis
Assets measured at fair value at June 30, 2025 on a non-recurring basis are summarized below:
  Fair Value Measurements at June 30, 2025 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$51,725 $ $ $51,725 
Commercial real estate loans108,763   108,763 
Foreclosed Assets:
Commercial975   975 
Residential1,809   1,809 
Assets measured at fair value at December 31, 2024 on a non-recurring basis are summarized below:
  Fair Value Measurements at December 31, 2024 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$33,658 $— $— $33,658 
Commercial real estate loans121,393 — — 121,393 
Foreclosed Assets:
Commercial real estate975 — — 975 
Residential244 — — 244 
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)
June 30, 2025    
Collateral Dependent Loans    
Commercial loans$51,725 DiscountedDiscount for type of property,
11% - 50% (30%)
 cash flowage of appraisal, and current status
Commercial real estate loans108,763 DiscountedDiscount for type of property,
0% - 32% (11%)
cash flowage of appraisal, and current status
Foreclosed Assets
Commercial real estate975 Fair value ofDiscount for type of property,28%
collateralage of appraisal, and current status
Residential (2)
1,809 Fair value ofDiscount for type of property,
24% (24%)
collateralage of appraisal, and current status
December 31, 2024  
Collateral Dependent Loans  
Commercial loans$33,658 DiscountedDiscount for type of property,
9% - 49% (31%)
 cash flowage of appraisal, and current status
Commercial real estate loans121,393 DiscountedDiscount for type of property,
3% - 46% (18%)
 cash flowage of appraisal, and current status
Foreclosed Assets  
Commercial real estate (2)
975 Fair value ofDiscount for type of property,
28%
collateralage of appraisal, and current status
Residential (2)
244 Fair value ofDiscount for type of property,
24%
  collateralage of appraisal, and current status 
(1)Unobservable inputs were weighted by the relative fair value of the instruments.
(2)There was only one foreclosed commercial real estate property at June 30, 2025 and December 31, 2024 with write-downs during the six months ended June 30, 2025 and the year ended December 31, 2024, respectively, so no range or weighted average is reported.
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 Value
Difference Contractual Principal
June 30, 2025   
Loans held-for-sale$77,618 $1,749 $75,869 
December 31, 2024
Loans held-for-sale$34,483 $271 $34,212 
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 June 30, 2025    
Loans held-for-sale$783 $101 $ $884 
Three Months Ended June 30, 2024
Loans held-for-sale$105 $$— $111 
Six Months Ended June 30, 2025
Loans held-for-sale$1,386 $101 $(9)$1,478 
Six Months Ended June 30, 2024
Loans held-for-sale$(97)$$(5)$(96)
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 June 30, 2025 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
$1,808,571 $1,808,571 $ $ 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies836,662  694,377  
Mortgage-backed securities - Agency941,464  796,079  
State and political subdivisions1,148,242  979,891  
Loans, net:
Commercial14,445,657   14,450,834 
Commercial real estate21,584,336   21,549,689 
Residential real estate8,180,392   7,426,652 
Consumer credit3,127,325   2,991,794 
Accrued interest receivable270,373 898 76,033 193,442 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$12,652,556 $12,652,556 $ $ 
Checking, NOW, savings, and money market
   interest-bearing deposits
32,493,898 32,493,898   
Time deposits9,211,229  9,169,678  
Federal funds purchased and interbank borrowings340,246 340,246   
Securities sold under agreements to repurchase297,637 297,637   
FHLB advances5,835,918  5,796,841  
Other borrowings872,297  874,585  
Accrued interest payable67,275  67,275  
Standby letters of credit1,804   1,804 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$ $ $ $6,271 
  Fair Value Measurements at December 31, 2024 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
$1,227,968 $1,227,968 $— $— 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies832,984 — 664,331 — 
Mortgage-backed securities - Agency970,212 — 800,666 — 
State and political subdivisions1,151,685 — 1,006,141 — 
Loans, net:
Commercial10,138,241 — — 10,158,299 
Commercial real estate16,105,961 — — 15,961,968 
Residential real estate6,774,664 — — 6,080,709 
Consumer credit2,874,499 — — 2,800,060 
Accrued interest receivable233,010 912 60,459 171,639 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$9,399,019 $9,399,019 $— $— 
Checking, NOW, savings, and money market
   interest-bearing deposits
24,668,802 24,668,802 — — 
Time deposits6,755,739 — 6,727,453 — 
Federal funds purchased and interbank borrowings385 385 — 
Securities sold under agreements to repurchase268,975 268,975 — 
FHLB advances4,452,559 — 4,340,188 — 
Other borrowings689,618 — 689,246 — 
Accrued interest payable65,057 — 65,057 — 
Standby letters of credit1,742 — — 1,742 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$— $— $— $3,403