Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities Available For Sale:
Total Securities Available For Sale	$ 584,857	$ 542,313
Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	584,857	542,313
Interest Rate swaps	4,493	1,877
Trading Securities:
Total Trading Securities	6,164	9,809
Liabilities:
Interest rate swaps	(5,327)	(2,362)
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Securities Available For Sale:
Total Securities Available For Sale	6,112	964
Interest Rate swaps	0	0
Trading Securities:
Total Trading Securities	6,113	9,758
Liabilities:
Interest rate swaps	0	0
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Securities Available For Sale:
Total Securities Available For Sale	578,323	538,554
Interest Rate swaps	4,493	1,877
Trading Securities:
Total Trading Securities	51	51
Liabilities:
Interest rate swaps	(5,327)	(2,362)
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Securities Available For Sale:
Total Securities Available For Sale	422	2,795
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	169,709	127,094
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	169,709	127,094
Trading Securities:
Total Trading Securities	51	51
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Securities Available For Sale:
Total Securities Available For Sale	0	0
Trading Securities:
Total Trading Securities	0	0
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Securities Available For Sale:
Total Securities Available For Sale	169,709	127,094
Trading Securities:
Total Trading Securities	51	51
U.S. Government sponsored entities | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Securities Available For Sale:
Total Securities Available For Sale	0	0
Trading Securities:
Total Trading Securities	0	0
State & political subdivisions
Securities Available For Sale:
Total Securities Available For Sale	66,952	104,363
State & political subdivisions | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	66,952	104,363
State & political subdivisions | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Securities Available For Sale:
Total Securities Available For Sale	0	0
State & political subdivisions | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Securities Available For Sale:
Total Securities Available For Sale	66,530	104,363
State & political subdivisions | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Securities Available For Sale:
Total Securities Available For Sale	422	0
Residential and multi-family mortgage
Securities Available For Sale:
Total Securities Available For Sale	306,309	276,636
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	306,309	276,636
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Securities Available For Sale:
Total Securities Available For Sale	5,130	0
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Securities Available For Sale:
Total Securities Available For Sale	301,179	273,841
Residential and multi-family mortgage | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Securities Available For Sale:
Total Securities Available For Sale	0	2,795
Corporate notes and bonds | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	13,402	8,082
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
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
Securities Available For Sale:
Total Securities Available For Sale	13,402	8,082
Corporate notes and bonds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Securities Available For Sale:
Total Securities Available For Sale	0	0
Pooled SBA
Securities Available For Sale:
Total Securities Available For Sale	27,503	25,174
Pooled SBA | Fair Value Measurement on Recurring Basis
Securities Available For Sale:
Total Securities Available For Sale	27,503	25,174
Pooled SBA | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Securities Available For Sale:
Total Securities Available For Sale	0	0
Pooled SBA | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Securities Available For Sale:
Total Securities Available For Sale	27,503	25,174
Pooled SBA | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
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	982	964
Other | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Securities Available For Sale:
Total Securities Available For Sale	982	964
Other | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Securities Available For Sale:
Total Securities Available For Sale	0	0
Other | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
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	3,964	7,946
Corporate equity securities | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Trading Securities:
Total Trading Securities	3,964	7,946
Corporate equity securities | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Trading Securities:
Total Trading Securities	0	0
Corporate equity securities | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Trading Securities:
Total Trading Securities	0	0
Mutual funds | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	1,060	807
Mutual funds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Trading Securities:
Total Trading Securities	1,060	807
Mutual funds | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Trading Securities:
Total Trading Securities	0	0
Mutual funds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Trading Securities:
Total Trading Securities	0	0
Certificates of deposit | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	417	350
Certificates of deposit | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Trading Securities:
Total Trading Securities	417	350
Certificates of deposit | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Trading Securities:
Total Trading Securities	0	0
Certificates of deposit | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Trading Securities:
Total Trading Securities	0	0
Corporate notes & bonds
Securities Available For Sale:
Total Securities Available For Sale	13,402	8,082
Corporate notes & bonds | Fair Value Measurement on Recurring Basis
Trading Securities:
Total Trading Securities	672	655
Corporate notes & bonds | Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets  for Identical Assets
Trading Securities:
Total Trading Securities	672	655
Corporate notes & bonds | Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs
Trading Securities:
Total Trading Securities	0	0
Corporate notes & bonds | Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs
Trading Securities:
Total Trading Securities	$ 0	$ 0