Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair value measurement
Securities, available-for-sale	$ 1,270,820	$ 1,020,744
US Government Agencies Debt Securities [Member]
Fair value measurement
Securities, available-for-sale	119,091	97,814
Mortgage Backed Securities - Residential
Fair value measurement
Securities, available-for-sale	574,939	355,121
Mortgage Backed Securities - Commercial
Fair value measurement
Securities, available-for-sale	15,927	18,490
Collateralized Mortgage Obligations
Fair value measurement
Securities, available-for-sale	162,268	214,160
State and Municipal Obligations
Fair value measurement
Securities, available-for-sale	363,157	306,131
Taxable Municipal Bonds
Fair value measurement
Securities, available-for-sale	31,538	23,139
US Treasury Securities
Fair value measurement
Securities, available-for-sale	656	2,753
Collateralized Debt Obligations
Fair value measurement
Securities, available-for-sale	3,244	3,136
Fair Value, Inputs, Level 1 [Member]
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities - Residential
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities - Commercial
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | State and Municipal Obligations
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Taxable Municipal Bonds
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Debt Obligations
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 2 [Member]
Fair value measurement
Securities, available-for-sale	1,265,681	1,015,713
Derivative Assets	1,371	2,465
Derivative Liability	(1,371)	(2,465)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Fair value measurement
Securities, available-for-sale	119,091	97,814
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential
Fair value measurement
Securities, available-for-sale	574,939	355,121
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial
Fair value measurement
Securities, available-for-sale	15,927	18,490
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations
Fair value measurement
Securities, available-for-sale	162,268	214,160
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations
Fair value measurement
Securities, available-for-sale	361,262	304,236
Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds
Fair value measurement
Securities, available-for-sale	31,538	23,139
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities
Fair value measurement
Securities, available-for-sale	656	2,753
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member]
Fair value measurement
Securities, available-for-sale	5,139	5,031
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member]
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities - Residential
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities - Commercial
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | State and Municipal Obligations
Fair value measurement
Securities, available-for-sale	1,895	1,895
Fair Value, Inputs, Level 3 [Member] | Taxable Municipal Bonds
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities
Fair value measurement
Securities, available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations
Fair value measurement
Securities, available-for-sale	$ 3,244	$ 3,136