Investment Securities - Held to Maturity (Details)	6 Months Ended
	Jun. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($) security	Jun. 30, 2020 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, available-for-sale, allowance for credit loss	$ 0
Held-To-Maturity Securities, at Amortized Cost	204,490,000	$ 218,405,000	$ 233,517,000
Gross Unrealized Gains	6,426,000	8,174,000	8,494,000
Gross Unrealized Losses	0	(3,000)	(136,000)
Held-To-Maturity Securities, at Fair Value	210,916,000	226,576,000	241,875,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	25,176,000
From 1 - 5 Years	160,431,000
From 5 - 10 Years	18,016,000
Over 10 Years	867,000
Maturities of Debt Securities, at Fair Value:
Within One Year	25,415,000
From 1 - 5 Years	165,764,000
From 5 - 10 Years	18,864,000
Over 10 Years	873,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	1,513,000	1,433,000
12 Months or Longer	0	0	1,358,000
Total	$ 0	$ 1,513,000	$ 2,791,000
Number of Securities in a Continuous Loss Position | security	0	4	8
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 3,000	$ 87,000
12 Months or Longer	0	0	49,000
Total	0	3,000	136,000
Debt securities, available-for-sale, allowance for credit loss, not to sell before recovery, credit loss, previously recorded, expense (reversal)	0
Debt securities, held-to-maturity, allowance for credit loss	0
Equity Securities	1,992,000	1,636,000	1,583,000
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	183,842,000	192,352,000	201,592,000
Gross Unrealized Gains	5,544,000	7,080,000	7,056,000
Gross Unrealized Losses	0	(3,000)	(136,000)
Held-To-Maturity Securities, at Fair Value	189,386,000	199,429,000	208,512,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	23,604,000
From 1 - 5 Years	141,355,000
From 5 - 10 Years	18,016,000
Over 10 Years	867,000
Maturities of Debt Securities, at Fair Value:
Within One Year	23,805,000
From 1 - 5 Years	145,844,000
From 5 - 10 Years	18,864,000
Over 10 Years	873,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	1,513,000	1,433,000
12 Months or Longer	0	0	1,358,000
Total	$ 0	$ 1,513,000	$ 2,791,000
Number of Securities in a Continuous Loss Position | security	0	4	8
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 3,000	$ 87,000
12 Months or Longer	0	0	49,000
Total	0	3,000	136,000
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	20,648,000	26,053,000	31,925,000
Gross Unrealized Gains	882,000	1,094,000	1,438,000
Gross Unrealized Losses	0	0	0
Held-To-Maturity Securities, at Fair Value	21,530,000	27,147,000	33,363,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	1,572,000
From 1 - 5 Years	19,076,000
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	1,610,000
From 1 - 5 Years	19,920,000
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position | security	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
Fair Value, Measurements, Recurring
Unrealized Losses on Securities in a Continuous Loss Position:
Equity Securities	1,992,000	1,636,000	1,583,000
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value	184,213,000	211,176,000	227,528,000
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	7,152,000	9,440,000	11,706,000
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	7,394,000	9,762,000	12,131,000
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	13,496,000	16,613,000	20,219,000
US Government-sponsored Enterprises Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	$ 14,136,000	$ 17,385,000	$ 21,232,000