Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Fair value measurements
Investment securities available-for-sale	$ 1,456,157	$ 1,536,299
Assets:
Mortgages held for sale	4,334	2,569
U.S. Treasury and Federal agencies securities
Fair value measurements
Investment securities available-for-sale	689,431	757,749
U.S. States and political subdivisions securities
Fair value measurements
Investment securities available-for-sale	99,863	82,632
Mortgage-backed securities - Federal agencies
Fair value measurements
Investment securities available-for-sale	666,863	695,918
Total
Fair value measurements
Investment securities available-for-sale	1,456,157	1,536,299
Assets:
Mortgages held for sale	4,334	2,569
Level 1
Fair value measurements
Investment securities available-for-sale	402,230	446,021
Assets:
Mortgages held for sale	0	0
Level 2
Fair value measurements
Investment securities available-for-sale	1,052,956	1,089,246
Assets:
Mortgages held for sale	4,334	2,569
Level 3
Fair value measurements
Investment securities available-for-sale	971	1,032
Assets:
Mortgages held for sale	0	0
Recurring basis \| Total
Fair value measurements
Investment securities available-for-sale	1,456,157	1,536,299
Assets:
Mortgages held for sale	4,334	2,569
Accrued income and other assets	18,496	16,424
Total	1,478,987	1,555,292
Liabilities:
Accrued expenses and other liabilities	18,843	16,727
Total	18,843	16,727
Recurring basis \| Total \| U.S. Treasury and Federal agencies securities
Fair value measurements
Investment securities available-for-sale	689,431	757,749
Recurring basis \| Total \| U.S. States and political subdivisions securities
Fair value measurements
Investment securities available-for-sale	99,863	82,632
Recurring basis \| Total \| Mortgage-backed securities - Federal agencies
Fair value measurements
Investment securities available-for-sale	666,863	695,918
Recurring basis \| Level 1
Fair value measurements
Investment securities available-for-sale	402,230	446,021
Assets:
Mortgages held for sale	0	0
Accrued income and other assets	0	0
Total	402,230	446,021
Liabilities:
Accrued expenses and other liabilities	0	0
Total	0	0
Recurring basis \| Level 1 \| U.S. Treasury and Federal agencies securities
Fair value measurements
Investment securities available-for-sale	402,230	446,021
Recurring basis \| Level 1 \| U.S. States and political subdivisions securities
Fair value measurements
Investment securities available-for-sale	0	0
Recurring basis \| Level 1 \| Mortgage-backed securities - Federal agencies
Fair value measurements
Investment securities available-for-sale	0	0
Recurring basis \| Level 2
Fair value measurements
Investment securities available-for-sale	1,052,956	1,089,246
Assets:
Mortgages held for sale	4,334	2,569
Accrued income and other assets	18,496	16,424
Total	1,075,786	1,108,239
Liabilities:
Accrued expenses and other liabilities	18,843	16,727
Total	18,843	16,727
Recurring basis \| Level 2 \| U.S. Treasury and Federal agencies securities
Fair value measurements
Investment securities available-for-sale	287,201	311,728
Recurring basis \| Level 2 \| U.S. States and political subdivisions securities
Fair value measurements
Investment securities available-for-sale	98,892	81,600
Recurring basis \| Level 2 \| Mortgage-backed securities - Federal agencies
Fair value measurements
Investment securities available-for-sale	666,863	695,918
Recurring basis \| Level 3
Fair value measurements
Investment securities available-for-sale	971	1,032
Assets:
Mortgages held for sale	0	0
Accrued income and other assets	0	0
Total	971	1,032
Liabilities:
Accrued expenses and other liabilities	0	0
Total	0	0
Recurring basis \| Level 3 \| U.S. Treasury and Federal agencies securities
Fair value measurements
Investment securities available-for-sale	0	0
Recurring basis \| Level 3 \| U.S. States and political subdivisions securities
Fair value measurements
Investment securities available-for-sale	971	1,032
Recurring basis \| Level 3 \| Mortgage-backed securities - Federal agencies
Fair value measurements
Investment securities available-for-sale	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of financial and nonfinancial obligations.

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