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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets:
 June 30, 2025
 Level 1Level 2Level 3Total
 (dollars in thousands)
Loans held for sale$— $23,281 $— $23,281 
AFS investment securities:
State and municipal securities— 774,749 — 774,749 
Corporate debt securities— 264,098 — 264,098 
Collateralized mortgage obligations— 1,172,238 — 1,172,238 
Residential mortgage-backed securities— 896,735 — 896,735 
Commercial mortgage-backed securities— 512,049 — 512,049 
Total AFS investment securities— 3,619,869 — 3,619,869 
Other assets:
Investments held in Rabbi Trust37,571 — — 37,571 
Derivative assets1,867 134,797 — 136,664 
Total assets$39,438 $3,777,947 $— $3,817,385 
Other liabilities:
Deferred compensation liabilities$37,571 $— $— $37,571 
Derivative liabilities1,638 189,496 — 191,134 
Total liabilities$39,209 $189,496 $— $228,705 
 December 31, 2024
 Level 1Level 2Level 3Total
 (dollars in thousands)
Loans held for sale$— $25,618 $— $25,618 
AFS investment securities:
State and municipal securities— 814,887 — 814,887 
Corporate debt securities— 300,370 — 300,370 
Collateralized mortgage obligations— 788,885 — 788,885 
Residential mortgage-backed securities— 989,875 — 989,875 
Commercial mortgage-backed securities— 516,882 — 516,882 
Total AFS investment securities— 3,410,899 — 3,410,899 
Other assets:
Investments held in Rabbi Trust35,093 — — 35,093 
Derivative assets1,682 159,939 — 161,621 
Total assets$36,775 $3,596,456 $— $3,633,231 
Other liabilities:
Deferred compensation liabilities$35,093 $— $— $35,093 
Derivative liabilities1,596 252,821 — 254,417 
Total liabilities$36,689 $252,821 $— $289,510 
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis:
 June 30,
2025		December 31,
2024
 (dollars in thousands)
Loans, Net$160,009 $168,668 
OREO2,706 2,621 
MSRs(1)
51,629 53,972 
SBA servicing asset2,801 3,120 
Total assets$217,145 $228,381 
(1) Amounts shown are estimated fair value. MSRs are recorded on the Corporation's Consolidated Balance Sheets at the lower of amortized cost or fair value.
See "Note 6 - Mortgage Servicing Rights" for additional information.
Details of Book Value and Fair Value of Financial Instruments
The following tables detail the book values and the estimated fair values of the Corporation's financial instruments:
 June 30, 2025
Estimated Fair Value
Carrying AmountLevel 1Level 2Level 3Total
(dollars in thousands)
FINANCIAL ASSETS
Cash and cash equivalents$804,664 $804,664 $— $— $804,664 
FRB and FHLB stock141,515 — 141,515 — 141,515 
Loans held for sale 23,281 — 23,281 — 23,281 
AFS investment securities 3,619,869 — 3,619,869 — 3,619,869 
HTM investment securities1,473,158 — 1,293,001 — 1,293,001 
Loans, net23,635,202 — — 22,484,657 22,484,657 
Accrued interest receivable117,130 117,130 — — 117,130 
Other assets 723,223 549,574 138,008 57,136 744,718 
FINANCIAL LIABILITIES  
Demand and savings deposits$21,202,779 $21,202,779 $— $— $21,202,779 
Brokered deposits817,398 80,212 736,913 — 817,125 
Time deposits4,117,890 — 4,114,313 — 4,114,313 
Accrued interest payable27,570 27,570 — — 27,570 
FHLB advances800,000 800,220 — — 800,220 
Senior debt and subordinated debt367,476 — 357,807 — 357,807 
Other borrowings606,424 586,483 1,086 — 587,569 
Other liabilities 400,592 196,916 189,496 14,180 400,592 
December 31, 2024
Estimated Fair Value
Carrying AmountLevel 1Level 2Level 3Total
(dollars in thousands)
FINANCIAL ASSETS
Cash and cash equivalents$1,063,871 $1,063,871 $— $— $1,063,871 
FRB and FHLB stock139,574 — 139,574 — 139,574 
Loans held for sale25,618 — 25,618 — 25,618 
AFS investment securities3,410,899 — 3,410,899 — 3,410,899 
HTM investment securities1,395,569 — 1,183,449 — 1,183,449 
Loans, net23,665,763 — — 22,555,687 22,555,687 
Accrued interest receivable117,029 117,029 — — 117,029 
Other assets736,502 543,251 159,939 59,713 762,903 
FINANCIAL LIABILITIES
Demand and savings deposits$21,135,478 $21,135,478 $— $— $21,135,478 
Brokered deposits843,857 145,056 698,647 — 843,703 
Time deposits4,150,098 — 4,154,726 — 4,154,726 
Accrued interest payable31,620 31,620 — — 31,620 
FHLB advances850,000 851,470 — — 851,470 
Senior debt and subordinated debt367,316 — 253,818 — 253,818 
Other borrowings564,732 544,908 901 — 545,809 
Other liabilities467,011 200,029 252,821 14,161 467,011