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Fair Value (Tables)
6 Months Ended
Jun. 30, 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 June 30, 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$85,521 $85,521 $ $ 
Investment securities available-for-sale:
U.S. Treasury205,308 205,308   
U.S. government-sponsored entities and agencies1,172,294  1,172,294  
Mortgage-backed securities - Agency4,888,456  4,888,456  
States and political subdivisions523,315  523,315  
Pooled trust preferred securities11,298  11,298  
Other securities304,807  304,807  
Loans held-for-sale66,126  66,126  
Derivative assets168,604  168,604  
Financial Liabilities
Derivative liabilities294,846  294,846  
  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 June 30, 2024 on a non-recurring basis are summarized below:
  Fair Value Measurements at June 30, 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$20,587 $ $ $20,587 
Commercial real estate loans111,159   111,159 
Foreclosed Assets:
Commercial975   975 
Residential65   65 
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)
June 30, 2024    
Collateral Dependent Loans    
Commercial loans$20,587 DiscountedDiscount for type of property,
5% - 54% (31%)
 cash flowage of appraisal, and current status
Commercial real estate loans111,159 DiscountedDiscount for type of property,
0% - 34% (11%)
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)
65 Fair value ofDiscount for type of property,
11%
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.
(2)There was only one foreclosed commercial real estate property and one foreclosed residential real estate property at June 30, 2024 with write-downs during the six months ended June 30, 2024, 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, 2024   
Loans held-for-sale$66,126 $525 $65,601 
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 June 30, 2024    
Loans held-for-sale$105 $6 $ $111 
Three Months Ended June 30, 2023
Loans held-for-sale$229 $— $(7)$222 
Six Months Ended June 30, 2024
Loans held-for-sale$(97)$6 $(5)$(96)
Six Months Ended June 30, 2023
Loans held-for-sale$176 $— $(10)$166 
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, 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
$1,233,046 $1,233,046 $ $ 
Investment securities held-to-maturity:
U.S. government-sponsored entities and agencies829,402  662,331  
Mortgage-backed securities - Agency1,001,915  838,289  
State and political subdivisions1,155,132  1,011,882  
Loans, net:
Commercial10,192,534   10,043,917 
Commercial real estate15,825,787   15,331,416 
Residential real estate6,871,822   5,964,205 
Consumer credit2,894,035   2,861,352 
Accrued interest receivable240,806 882 57,984 181,940 
Financial Liabilities
Deposits:
Noninterest-bearing demand deposits$9,336,042 $9,336,042 $ $ 
Checking, NOW, savings, and money market
   interest-bearing deposits
23,614,973 23,614,973   
Time deposits7,048,213  7,013,100  
Federal funds purchased and interbank borrowings250,154 250,154   
Securities sold under agreements to repurchase240,713 240,713   
FHLB advances4,744,560  4,536,762  
Other borrowings849,777  839,834  
Accrued interest payable63,049  63,049  
Standby letters of credit1,504   1,504 
Off-Balance Sheet Financial Instruments
Commitments to extend credit$ $ $ $3,300 
  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