Fair Value - Fair value of derivatives is based on valuation models using observable market data as of the measurement date (Level 2 inputs) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair value measurement
Securities available-for-sale	$ 1,225,219	$ 1,330,481
U.S. Government agencies
Fair value measurement
Securities available-for-sale	89,933	98,473
Mortgage Backed Securities - residential
Fair value measurement
Securities available-for-sale	556,690	620,248
Mortgage Backed Securities - commercial
Fair value measurement
Securities available-for-sale	7,284	9,677
Collateralized Mortgage Obligations
Fair value measurement
Securities available-for-sale	180,956	203,485
State and municipal obligations
Fair value measurement
Securities available-for-sale	352,553	360,153
Municipal taxable
Fair value measurement
Securities available-for-sale	32,628	32,515
U.S. Treasury
Fair value measurement
Securities available-for-sale	2,151	2,944
Collateralized debt obligations
Fair value measurement
Securities available-for-sale	3,024	2,986
Level 2
Fair value measurement
Securities available-for-sale	1,221,015	1,325,950
Derivative Assets	3,608	2,838
Derivative Liability	(3,608)	(2,838)
Level 2 | U.S. Government agencies
Fair value measurement
Securities available-for-sale	89,933	98,473
Level 2 | Mortgage Backed Securities - residential
Fair value measurement
Securities available-for-sale	556,690	620,248
Level 2 | Mortgage Backed Securities - commercial
Fair value measurement
Securities available-for-sale	7,284	9,677
Level 2 | Collateralized Mortgage Obligations
Fair value measurement
Securities available-for-sale	180,956	203,485
Level 2 | State and municipal obligations
Fair value measurement
Securities available-for-sale	351,373	358,608
Level 2 | Municipal taxable
Fair value measurement
Securities available-for-sale	32,628	32,515
Level 2 | U.S. Treasury
Fair value measurement
Securities available-for-sale	2,151	2,944
Level 3
Fair value measurement
Securities available-for-sale	4,204	4,531
Level 3 | State and municipal obligations
Fair value measurement
Securities available-for-sale	1,180	1,545
Level 3 | Collateralized debt obligations
Fair value measurement
Securities available-for-sale	$ 3,024	$ 2,986