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Loans, net and allowance for credit losses - Major Classifications of Loans Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable
Loans	$ 3,991,539	$ 3,993,505
Financing receivable, accrued interest, after allowance for credit loss	14,100		$ 13,200
Accrued interest receivable on available of sale securities	2,100		2,200
Accrued interest receivable on held to maturity securities	170		$ 179
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Loans	658,858	648,102
Municipal
Accounts, Notes, Loans and Financing Receivable
Loans	194,139	187,918
Commercial, Industrial and Municipal
Accounts, Notes, Loans and Financing Receivable
Loans	852,997	836,020
Real estate
Accounts, Notes, Loans and Financing Receivable
Loans	2,835,308	2,845,496
Commercial real estate
Accounts, Notes, Loans and Financing Receivable
Loans	2,275,241	2,294,113
Residential real estate
Accounts, Notes, Loans and Financing Receivable
Loans	560,067	551,383
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans	123,028	132,869
Indirect Auto
Accounts, Notes, Loans and Financing Receivable
Loans	108,819	117,914
Consumer Other
Accounts, Notes, Loans and Financing Receivable
Loans	14,209	14,955
Equipment Financing
Accounts, Notes, Loans and Financing Receivable
Loans	$ 180,206	$ 179,120

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Amount, after allowance for credit loss, of accrued interest on 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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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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