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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities Available For Sale:
Total Securities Available For Sale	$ 732,793	$ 584,908
Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	732,793	584,908
Interest Rate swaps	2,569	4,017
Trading Securities:
Total Trading Securities	9,941	6,649
Liabilities:
Interest rate swaps	(3,101)	(4,785)
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale	20,016	16,018
Interest Rate swaps	0	0
Trading Securities:
Total Trading Securities	9,941	6,599
Liabilities:
Interest rate swaps	0	0
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	712,777	568,826
Interest Rate swaps	2,569	4,017
Trading Securities:
Total Trading Securities	0	50
Liabilities:
Interest rate swaps	(3,101)	(4,785)
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	64
Interest Rate swaps	0	0
Trading Securities:
Total Trading Securities	0	0
Liabilities:
Interest rate swaps	0	0
U.S. Government sponsored entities
Securities Available For Sale:
Total Securities Available For Sale	150,576	157,042
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	150,576	157,042
Trading Securities:
Total Trading Securities		50
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Trading Securities:
Total Trading Securities		0
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	150,576	157,042
Trading Securities:
Total Trading Securities		50
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Trading Securities:
Total Trading Securities		0
States and political subdivisions
Securities Available For Sale:
Total Securities Available For Sale	108,831	70,883
States and political subdivisions | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	108,831	70,883
States and political subdivisions | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale	0	0
States and political subdivisions | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	108,831	70,819
States and political subdivisions | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	64
Residential and multi-family mortgage
Securities Available For Sale:
Total Securities Available For Sale	428,809	315,192
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	428,809	315,192
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale	20,016	15,039
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	408,793	300,153
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Corporate notes and bonds | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	23,239	14,926
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	23,239	14,926
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Pooled SBA
Securities Available For Sale:
Total Securities Available For Sale	21,338	25,886
Pooled SBA | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	21,338	25,886
Pooled SBA | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Pooled SBA | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	21,338	25,886
Pooled SBA | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Other | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale		979
Other | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities Available For Sale:
Total Securities Available For Sale		979
Other | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale		0
Other | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale		0
Corporate equity securities | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	6,451	4,343
Corporate equity securities | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Trading Securities:
Total Trading Securities	6,451	4,343
Corporate equity securities | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Trading Securities:
Total Trading Securities	0	0
Corporate equity securities | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Trading Securities:
Total Trading Securities	0	0
Mutual funds | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	2,607	1,283
Mutual funds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Trading Securities:
Total Trading Securities	2,607	1,283
Mutual funds | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Trading Securities:
Total Trading Securities	0	0
Mutual funds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Trading Securities:
Total Trading Securities	0	0
Certificates of deposit | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	296	404
Certificates of deposit | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Trading Securities:
Total Trading Securities	296	404
Certificates of deposit | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Trading Securities:
Total Trading Securities	0	0
Certificates of deposit | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Trading Securities:
Total Trading Securities	0	0
Corporate notes and bonds
Securities Available For Sale:
Total Securities Available For Sale	23,239	14,926
Corporate notes and bonds | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	587	569
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Trading Securities:
Total Trading Securities	587	569
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Trading Securities:
Total Trading Securities	0	0
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Trading Securities:
Total Trading Securities	$ 0	$ 0

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