Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Debt securities	$ 969,793	$ 969,308
Equity securities	935	1,083
Derivative financial assets	72,093	63,018
LIABILITIES
Derivative financial liabilities	90,982	78,293
U.S. Treasury securities
ASSETS
Debt securities	132,586	133,786
Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	32,593	32,513
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	467,198	460,939
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	36,662	38,177
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	275,749	273,425
Obligations of states and political subdivisions
ASSETS
Debt securities	25,005	30,468
Fair Value Measurements, Recurring
ASSETS
Debt securities	969,793	969,308
Equity securities	935	1,083
Total Securities Available for Sale	970,728	970,391
Securities held in a deferred compensation plan	10,257	9,399
Total Assets	1,053,078	1,042,808
LIABILITIES
Total Liabilities	90,982	78,293
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Debt securities	132,586	133,786
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	32,593	32,513
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	467,198	460,939
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	36,662	38,177
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	275,749	273,425
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Debt securities	25,005	30,468
Fair Value Measurements, Recurring | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	72,093	63,018
LIABILITIES
Derivative financial liabilities	72,578	63,554
Fair Value Measurements, Recurring | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	18,404	14,739
Fair Value Measurements, Recurring | Level 1
ASSETS
Debt securities	132,586	133,786
Equity securities	935	1,010
Total Securities Available for Sale	133,521	134,796
Securities held in a deferred compensation plan	10,257	9,399
Total Assets	143,778	144,195
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Debt securities	132,586	133,786
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 2
ASSETS
Debt securities	837,207	835,522
Equity securities	0	73
Total Securities Available for Sale	837,207	835,595
Securities held in a deferred compensation plan	0	0
Total Assets	909,300	898,613
LIABILITIES
Total Liabilities	90,982	78,293
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	32,593	32,513
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	467,198	460,939
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	36,662	38,177
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	275,749	273,425
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Debt securities	25,005	30,468
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	72,093	63,018
LIABILITIES
Derivative financial liabilities	72,578	63,554
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	18,404	14,739
Fair Value Measurements, Recurring | Level 3
ASSETS
Debt securities	0	0
Equity securities	0	0
Total Securities Available for Sale	0	0
Securities held in a deferred compensation plan	0	0
Total Assets	0	0
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	$ 0	$ 0