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Fair Value (Tables)
3 Months Ended
Mar. 31, 2024
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 March 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$84,954 $84,954 $ $ 
Investment securities available-for-sale:
U.S. Treasury233,051 233,051   
U.S. government-sponsored entities and agencies1,183,019  1,183,019  
Mortgage-backed securities - Agency4,550,023  4,550,023  
States and political subdivisions515,104  515,104  
Pooled trust preferred securities11,274  11,274  
Other securities299,181  299,181  
Loans held-for-sale19,418  19,418  
Derivative assets167,479  167,479  
Financial Liabilities
Derivative liabilities297,403  297,403  
  Fair Value Measurements at December 31, 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$80,372 $80,372 $— $— 
Investment securities available-for-sale:
U.S. Treasury396,733 396,733 — — 
U.S. government-sponsored entities and agencies1,231,264 — 1,231,264 — 
Mortgage-backed securities - Agency4,216,560 — 4,216,560 — 
States and political subdivisions535,260 — 535,260 — 
Pooled trust preferred securities11,337 — 11,337 — 
Other securities321,901 — 321,901 — 
Loans held-for-sale32,006 — 32,006 — 
Derivative assets166,302 — 166,302 — 
Financial Liabilities
Derivative liabilities268,916 — 268,916 — 
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis
Assets measured at fair value at March 31, 2024 on a non-recurring basis are summarized below:
  Fair Value Measurements at March 31, 2024 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$26,057 $ $ $26,057 
Commercial real estate loans83,492   83,492 
Foreclosed Assets:
Commercial1,669   1,669 
Assets measured at fair value at December 31, 2023 on a non-recurring basis are summarized below:
  Fair Value Measurements at December 31, 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)
Collateral Dependent Loans:    
Commercial loans$11,017 $— $— $11,017 
Commercial real estate loans95,457 — — 95,457 
Foreclosed Assets:
Commercial real estate1,669 — — 1,669 
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)
March 31, 2024    
Collateral Dependent Loans    
Commercial loans$26,057 DiscountedDiscount for type of property,
2% - 38% (29%)
 cash flowage of appraisal, and current status
Commercial real estate loans83,492 DiscountedDiscount for type of property,
1% - 34% (13%)
cash flowage of appraisal, and current status
Foreclosed Assets
Commercial real estate1,669 Fair value ofDiscount for type of property,
4% - 8% (4%)
collateralage of appraisal, and current status
December 31, 2023  
Collateral Dependent Loans  
Commercial loans$11,017 DiscountedDiscount for type of property,
5% - 37% (27%)
 cash flowage of appraisal, and current status
Commercial real estate loans95,457 DiscountedDiscount for type of property,
2% - 38% (16%)
 cash flowage of appraisal, and current status
Foreclosed Assets  
Commercial real estate1,669 Fair value ofDiscount for type of property,
4% - 8% (4%)
collateralage 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 follows: 
(dollars in thousands)Aggregate
Fair Value
Difference Contractual Principal
March 31, 2024   
Loans held-for-sale$19,418 $414 $19,004 
December 31, 2023
Loans held-for-sale$32,006 $621 $31,385 
The following table presents the amount of gains and losses from fair value changes included in income before income taxes for financial assets carried at fair value:
(dollars in thousands)Other
Gains and (Losses)
Interest IncomeInterest (Expense)Total Changes
in Fair Values
Included in
Current Period Earnings
Three Months Ended March 31, 2024
Loans held-for-sale$(202)$ $(5)$(207)
Three Months Ended March 31, 2023
Loans held-for-sale$(53)$— $(3)$(56)
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 March 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
$939,499 $939,499 $ $ 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies827,684  662,735  
Mortgage-backed securities - Agency1,016,858  857,657  
State and political subdivisions1,156,807  1,027,184  
Loans, net:
Commercial9,522,947   9,357,300 
Commercial real estate14,492,040   14,005,872 
Residential real estate6,639,480   5,682,754 
Consumer credit2,649,139   2,607,831 
Accrued interest receivable219,809 1,133 47,057 171,619 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$9,257,709 $9,257,709 $ $ 
Checking, NOW, savings, and money market
   interest-bearing deposits
22,490,875 22,490,875   
Time deposits5,950,834  5,913,854  
Federal funds purchased and interbank borrowings50,416 50,416   
Securities sold under agreements to repurchase274,493 274,493   
FHLB advances4,193,039  3,994,880  
Other borrowings813,213  798,748  
Accrued interest payable54,690  54,690  
Standby letters of credit1,379   1,379 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$ $ $ $3,824 
  Fair Value Measurements at December 31, 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
$1,175,058 $1,175,058 $— $— 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies825,953 — 671,126 — 
Mortgage-backed securities - Agency1,029,131 — 881,994 — 
State and political subdivisions1,158,409 — 1,048,068 — 
Loans, net:
Commercial9,392,267 — — 9,258,193 
Commercial real estate13,984,273 — — 13,640,868 
Residential real estate6,678,606 — — 5,579,999 
Consumer credit2,629,171 — — 2,555,121 
Accrued interest receivable225,159 859 54,465 169,835 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$9,664,247 $9,664,247 $— $— 
Checking, NOW, savings, and money market
   interest-bearing deposits
21,991,789 21,991,789 — — 
Time deposits5,579,144 — 5,552,538 — 
Federal funds purchased and interbank borrowings390 390 — 
Securities sold under agreements to repurchase285,206 285,206 — 
FHLB advances4,280,681 — 4,090,954 — 
Other borrowings764,870 — 755,592 — 
Accrued interest payable57,094 — 57,094 — 
Standby letters of credit1,318 — — 1,318 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$— $— $— $3,839