Fair Value - Fair Value of Assets Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial Assets
Available-for-sale debt securities	$ 1,841,845	$ 1,871,742
Loans held for sale	2,979	3,151
Other real estate owned	7,216	2,301
Fair Value, Measurements, Recurring
Financial Assets
Available-for-sale debt securities	1,841,845	1,871,742
Derivative financial instruments	44,276	23,142
Loans held for sale	2,979	3,151
Equity securities	13,120	8,220
Financial Liabilities
Derivative financial instruments	37,362	23,142
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Available-for-sale debt securities	188	186
Derivative financial instruments	0	0
Loans held for sale	0	0
Equity securities	13,120	8,220
Financial Liabilities
Derivative financial instruments	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets
Available-for-sale debt securities	1,841,657	1,871,556
Derivative financial instruments	44,276	23,142
Loans held for sale	2,979	3,151
Equity securities	0	0
Financial Liabilities
Derivative financial instruments	37,362	23,142
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Financial Assets
Available-for-sale debt securities	0	0
Derivative financial instruments	0	0
Loans held for sale	0	0
Equity securities	0	0
Financial Liabilities
Derivative financial instruments	0	0
Fair Value, Measurements, Nonrecurring
Financial Assets
Loans	10,482	8,513
Other real estate owned	7,216	2,301
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Loans	0	0
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Financial Assets
Loans	818	1,183
Other real estate owned	7,216	2,301
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Financial Assets
Loans	9,664	7,330
Other real estate owned	$ 0	$ 0