Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Securities Available For Sale:
Total Securities Available For Sale	$ 613,461	$ 584,908
Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	613,461	584,908
Interest Rate swaps	2,593	4,017
Trading Securities:
Total Trading Securities	6,877	6,649
Liabilities:
Interest rate swaps	(3,255)	(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	8,020	16,018
Interest Rate swaps	0	0
Trading Securities:
Total Trading Securities	6,877	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	603,191	568,826
Interest Rate swaps	2,593	4,017
Trading Securities:
Total Trading Securities	0	50
Liabilities:
Interest rate swaps	(3,255)	(4,785)
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	2,250	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	159,566	157,042
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	159,566	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	159,566	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
State & political subdivisions
Securities Available For Sale:
Total Securities Available For Sale	79,195	70,883
State & political subdivisions | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	79,195	70,883
State & 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
State & political subdivisions | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	79,195	70,819
State & 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	330,291	315,192
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	330,291	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	4,054	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	326,237	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	18,854	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	3,000	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	13,604	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	2,250	0
Pooled SBA
Securities Available For Sale:
Total Securities Available For Sale	24,589	25,886
Pooled SBA | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	24,589	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	24,589	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	966	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	966	979
Other | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Other | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Securities Available For Sale:
Total Securities Available For Sale	0	0
Corporate equity securities | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	4,524	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	4,524	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	1,361	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	1,361	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	400	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	400	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 & bonds
Securities Available For Sale:
Total Securities Available For Sale	18,854	14,926
Corporate notes & bonds | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	592	569
Corporate notes & bonds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Trading Securities:
Total Trading Securities	592	569
Corporate notes & bonds | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2)
Trading Securities:
Total Trading Securities	0	0
Corporate notes & bonds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3)
Trading Securities:
Total Trading Securities	$ 0	$ 0