Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Available-for-sale debt securities	$ 997,702	$ 1,001,784
Marketable equity securities	1,006	994
Derivative financial assets	67,403	83,456
LIABILITIES
Derivative financial liabilities	82,685	104,817
U.S. Treasury securities
ASSETS
Available-for-sale debt securities	133,704	131,695
Obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	42,095	41,811
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	432,739	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	41,170	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	317,099	327,313
Obligations of states and political subdivisions
ASSETS
Available-for-sale debt securities	30,895	30,471
Fair Value Measurements, Recurring
ASSETS
Available-for-sale debt securities	997,702	1,001,784
Marketable equity securities	1,006	994
Total Securities	998,708	1,002,778
Securities held in a deferred compensation plan	7,790	8,087
Total Assets	1,073,901	1,094,321
LIABILITIES
Total Liabilities	82,685	104,817
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Available-for-sale debt securities	133,704	131,695
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	42,095	41,811
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	432,739	428,407
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	41,170	41,587
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	317,099	327,313
Fair Value Measurements, Recurring | Corporate obligations
ASSETS
Available-for-sale debt securities		500
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Available-for-sale debt securities	30,895	30,471
Fair Value Measurements, Recurring | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	67,397	83,449
LIABILITIES
Derivative financial liabilities	67,397	83,449
Fair Value Measurements, Recurring | Interest rate lock commitments
ASSETS
Derivative financial assets	6	5
Fair Value Measurements, Recurring | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		2
Fair Value Measurements, Recurring | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	15,288	21,368
Fair Value Measurements, Recurring | Level 1
ASSETS
Available-for-sale debt securities	133,704	131,695
Marketable equity securities	953	952
Total Securities	134,657	132,647
Securities held in a deferred compensation plan	7,790	8,087
Total Assets	142,447	140,734
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Available-for-sale debt securities	133,704	131,695
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Corporate obligations
ASSETS
Available-for-sale debt securities		0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Available-for-sale 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 lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring | Level 1 | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		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
Available-for-sale debt securities	863,998	870,089
Marketable equity securities	53	42
Total Securities	864,051	870,131
Securities held in a deferred compensation plan	0	0
Total Assets	931,448	953,580
LIABILITIES
Total Liabilities	82,685	104,817
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	42,095	41,811
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	432,739	428,407
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	41,170	41,587
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	317,099	327,313
Fair Value Measurements, Recurring | Level 2 | Corporate obligations
ASSETS
Available-for-sale debt securities		500
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Available-for-sale debt securities	30,895	30,471
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	67,397	83,449
LIABILITIES
Derivative financial liabilities	67,397	83,449
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		0
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	15,288	21,368
Fair Value Measurements, Recurring | Level 3
ASSETS
Available-for-sale debt securities	0	0
Marketable equity securities	0	0
Total Securities	0	0
Securities held in a deferred compensation plan	0	0
Total Assets	6	7
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Available-for-sale debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Corporate obligations
ASSETS
Available-for-sale debt securities		0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Available-for-sale 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 lock commitments
ASSETS
Derivative financial assets	6	5
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		2
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	$ 0	$ 0