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Fair Value of Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table presents the balances of assets and liabilities measured at fair value on a recurring basis as of June 30, 2025 and December 31, 2024.
(dollars in thousands)Quoted Prices in Active Markets for Identical Assets or Liabilities
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		Total
June 30, 2025
Assets:
Investment Securities Available-for-Sale
Debt Securities Issued by the U.S. Treasury and Government Agencies$133,946 $109,769 $— $243,715 
Debt Securities Issued by States and Political Subdivisions— 65,960 — 65,960 
Debt Securities Issued by U.S. Government-Sponsored Enterprises— 985 — 985 
Debt Securities Issued by Corporations— 728,842 — 728,842 
Collateralized Mortgage Obligations Issued by:
Residential - Government Agencies or Sponsored Enterprises— 1,097,369 — 1,097,369 
Commercial - Government Agencies or Sponsored Enterprises— 332,461 — 332,461 
Commercial - Non Agency— 36,007 — 36,007 
Total Collateralized Mortgage Obligations— 1,465,837 — 1,465,837 
Mortgage-Backed Securities:
Residential - Government Agencies or Sponsored Enterprises— 606,165 — 606,165 
Total Investment Securities Available-for-Sale133,946 2,977,558 — 3,111,504 
Loans Held for Sale— 1,867 — 1,867 
Mortgage Servicing Rights— — 619 619 
Deferred Compensation Plan Assets14,569 — — 14,569 
Derivatives 1
— 108,186 37 108,223 
Total Assets Measured at Fair Value on a Recurring Basis as of June 30, 2025$148,515 $3,087,611 $656 $3,236,782 
Liabilities:
Derivatives 1
$— $120,147 $— $120,147 
Total Liabilities Measured at Fair Value on a Recurring Basis as of June 30, 2025$— $120,147 $— $120,147 
December 31, 2024
Assets:
Investment Securities Available-for-Sale
Debt Securities Issued by the U.S. Treasury and Government Agencies$150,389 $98,683 $— $249,072 
Debt Securities Issued by States and Political Subdivisions— 63,859 — 63,859 
Debt Securities Issued by U.S. Government-Sponsored Enterprises— 1,464 — 1,464 
Debt Securities Issued by Corporations— 671,675 — 671,675 
Collateralized Mortgage Obligations Issued by:
Residential - Government Agencies or Sponsored Enterprises— 935,220 — 935,220 
Commercial - Government Agencies or Sponsored Enterprises— 283,474 — 283,474 
Total Collateralized Mortgage Obligations— 1,218,694 — 1,218,694 
Mortgage-Backed Securities Issued by:
Residential - Government Agencies or Sponsored Enterprises— 484,764 — 484,764 
Total Investment Securities Available-for-Sale150,389 2,539,139 — 2,689,528 
Loans Held for Sale— 2,150 — 2,150 
Mortgage Servicing Rights— — 647 647 
Deferred Compensation Plan Assets18,155 — — 18,155 
Derivatives 1
— 161,439 34 161,473 
Total Assets Measured at Fair Value on a Recurring Basis as of December 31, 2024$168,544 $2,702,728 $681 $2,871,953 
Liabilities:
Derivatives 1
$— $154,058 $— $154,058 
Total Liabilities Measured at Fair Value on a Recurring Basis as of December 31, 2024$— $154,058 $— $154,058 
1The fair value of each class of derivatives is shown in Note 10. Derivative Financial Instruments.
Schedule of Assets Measured at Fair Value on Nonrecurring Basis
The Company may be required periodically to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower-of-cost-or-fair value accounting or impairment write-downs of individual assets. As of June 30, 2025 and December 31, 2024, there were no assets or liabilities with nonrecurring fair value adjustments. Additionally, there were no nonrecurring fair value adjustments during the three and six months ended June 30, 2025 and 2024.
Schedule of Difference between Aggregate Fair Value and Aggregate Unpaid Principal Balance
The following table reflects the difference between the aggregate fair value and the aggregate unpaid principal balance of the Company’s residential mortgage loans held for sale as of June 30, 2025 and December 31, 2024.
(dollars in thousands)Aggregate Fair ValueAggregate Unpaid PrincipalAggregate Fair Value Less Aggregate Unpaid Principal
June 30, 2025
Loans Held for Sale$1,867 $1,832 $35 
December 31, 2024
Loans Held for Sale$2,150 $2,109 $41 
Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments
The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments not recorded at fair value on a recurring basis as of June 30, 2025 and December 31, 2024. This table excludes financial instruments for which the carrying amount approximates fair value. For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization. For non-marketable equity securities such as Federal Home Loan Bank of Des Moines and Federal Reserve Bank stock, the carrying amount is a reasonable estimate of fair value as these securities can only be redeemed or sold at their par value and only to the respective issuing government supported institution
or to another member institution. For financial liabilities such as noninterest-bearing demand, interest-bearing demand, and savings deposits, the carrying amount is the estimate of fair value due to these products having no stated maturity.
Fair Value Measurements
(dollars in thousands)Carrying AmountFair ValueQuoted Prices in Active Markets for Identical Assets or Liabilities
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
June 30, 2025
Financial Instruments - Assets
Investment Securities Held-to-Maturity$4,441,353 $3,754,794 $121,178 $3,633,616 $— 
Loans13,700,594 13,073,565 — — 13,073,565 
Financial Instruments - Liabilities
Time Deposits3,037,995 3,028,864 — 3,028,864 — 
Securities Sold Under Agreements to Repurchase50,000 51,619 — 51,619 — 
Other Debt 1
550,000 545,556 — 545,556 — 
December 31, 2024
Financial Instruments – Assets
Investment Securities Held-to-Maturity$4,618,543 $3,820,882 $116,941 $3,703,941 $— 
Loans13,777,756 12,908,626 — — 12,908,626 
Financial Instruments – Liabilities
Time Deposits3,059,575 3,050,583 — 3,050,583 — 
Securities Sold Under Agreements to Repurchase100,000 101,478 — 101,478 — 
Other Debt 1
550,000 538,808 — 538,808 — 
1Excludes finance lease obligations.