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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
ASSETS    
Debt securities, available-for-sale, excluding accrued interest $ 1,027,080 $ 909,651
Marketable equity securities 1,138 1,142
U.S. Treasury securities    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 129,994 95,327
Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 58,493 70,348
Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 385,602 270,294
Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 50,446 56,793
Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 330,811 341,300
Obligations of states and political subdivisions    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 71,234 75,089
Fair Value Measurements, Recurring    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 1,027,080 909,651
Marketable equity securities 1,138 1,142
Total Securities 1,028,218 910,793
Securities held in a deferred compensation plan 8,888 10,230
Total Assets 1,066,674 954,956
LIABILITIES    
Total Liabilities 31,692 33,631
Fair Value Measurements, Recurring | U.S. Treasury securities    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 129,994 95,327
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 58,493 70,348
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 385,602 270,294
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 50,446 56,793
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 330,811 341,300
Fair Value Measurements, Recurring | Corporate obligations    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 500 500
Fair Value Measurements, Recurring | Obligations of states and political subdivisions    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 71,234 75,089
Fair Value Measurements, Recurring | Interest rate swaps - commercial loans    
ASSETS    
Derivative financial assets 29,056 33,528
LIABILITIES    
Derivative financial liabilities 29,092 33,631
Fair Value Measurements, Recurring | Interest rate lock commitments    
ASSETS    
Derivative financial assets 185 401
Fair Value Measurements, Recurring | Forward sale contracts - mortgage loans    
ASSETS    
Derivative financial assets 192 4
Fair Value Measurements, Recurring | Interest rate swaps - cash flow hedge    
ASSETS    
Derivative financial assets 135 0
LIABILITIES    
Derivative financial liabilities 2,600  
Fair Value Measurements, Recurring | Level 1    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 129,994 95,327
Marketable equity securities 1,060 1,061
Total Securities 131,054 96,388
Securities held in a deferred compensation plan 8,888 10,230
Total Assets 139,942 106,618
LIABILITIES    
Total Liabilities 0 0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 129,994 95,327
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 1 | Corporate obligations    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 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 0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps - cash flow hedge    
ASSETS    
Derivative financial assets 0 0
LIABILITIES    
Derivative financial liabilities 0  
Fair Value Measurements, Recurring | Level 2    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 897,086 814,324
Marketable equity securities 78 81
Total Securities 897,164 814,405
Securities held in a deferred compensation plan 0 0
Total Assets 926,355 847,933
LIABILITIES    
Total Liabilities 31,692 33,631
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 58,493 70,348
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 385,602 270,294
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 50,446 56,793
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 330,811 341,300
Fair Value Measurements, Recurring | Level 2 | Corporate obligations    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 500 500
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 71,234 75,089
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - commercial loans    
ASSETS    
Derivative financial assets 29,056 33,528
LIABILITIES    
Derivative financial liabilities 29,092 33,631
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 0
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - cash flow hedge    
ASSETS    
Derivative financial assets 135 0
LIABILITIES    
Derivative financial liabilities 2,600  
Fair Value Measurements, Recurring | Level 3    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Marketable equity securities 0 0
Total Securities 0 0
Securities held in a deferred compensation plan 0 0
Total Assets 377 405
LIABILITIES    
Total Liabilities 0 0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 3 | Corporate obligations    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 0 0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions    
ASSETS    
Debt securities, available-for-sale, excluding accrued interest 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 185 401
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts - mortgage loans    
ASSETS    
Derivative financial assets 192 4
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps - cash flow hedge    
ASSETS    
Derivative financial assets 0 $ 0
LIABILITIES    
Derivative financial liabilities $ 0