Investment Securities - Held to Maturity (Details)	3 Months Ended
	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security	Sep. 30, 2022 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest	$ 0
Held-To-Maturity Securities, at Amortized Cost	140,577,000	$ 175,364,000	$ 182,178,000
Gross Unrealized Gains	0	1,000	1,000
Gross Unrealized Losses	(5,766,000)	(3,742,000)	(6,379,000)
Held-To-Maturity Securities, at Fair Value	134,811,000	171,623,000	175,800,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	56,686,000
From 1 - 5 Years	81,554,000
From 5 - 10 Years	2,308,000
Over 10 Years	29,000
Maturities of Debt Securities, at Fair Value:
Within One Year	55,883,000
From 1 - 5 Years	76,714,000
From 5 - 10 Years	2,185,000
Over 10 Years	29,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,575,000	148,926,000	153,083,000
12 Months or Longer	117,090,000	0	0
Total	$ 118,665,000	$ 148,926,000	$ 153,083,000
Number of Securities in a Continuous Loss Position | security	355	413	435,000
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 86,000	$ 3,742,000	$ 6,379,000
12 Months or Longer	5,680,000	0	0
Total	5,766,000	3,742,000	6,379,000
Debt securities, available-for-sale, excluding accrued interest, 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, excluding accrued interest	0
Equity Securities	1,960,000	2,174,000	2,126,000
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	131,017,000	163,600,000	169,619,000
Gross Unrealized Gains	0	1,000	1,000
Gross Unrealized Losses	(5,204,000)	(3,131,000)	(5,771,000)
Held-To-Maturity Securities, at Fair Value	125,813,000	160,470,000	163,849,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	56,686,000
From 1 - 5 Years	71,994,000
From 5 - 10 Years	2,308,000
Over 10 Years	29,000
Maturities of Debt Securities, at Fair Value:
Within One Year	55,883,000
From 1 - 5 Years	67,716,000
From 5 - 10 Years	2,185,000
Over 10 Years	29,000
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,575,000	137,773,000	141,132,000
12 Months or Longer	108,092,000	0	0
Total	$ 109,667,000	$ 137,773,000	$ 141,132,000
Number of Securities in a Continuous Loss Position | security	339	397	419,000
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 86,000	$ 3,131,000	$ 5,771,000
12 Months or Longer	5,118,000	0	0
Total	5,204,000	3,131,000	5,771,000
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	9,560,000	11,764,000	12,559,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	(562,000)	(611,000)	(608,000)
Held-To-Maturity Securities, at Fair Value	8,998,000	11,153,000	11,951,000
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	9,560,000
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	8,998,000
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	11,153,000	11,951,000
12 Months or Longer	8,998,000	0	0
Total	$ 8,998,000	$ 11,153,000	$ 11,951,000
Number of Securities in a Continuous Loss Position | security	16	16	16,000
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 611,000	$ 608,000
12 Months or Longer	562,000	0	0
Total	562,000	611,000	608,000
Fair Value, Measurements, Recurring
Unrealized Losses on Securities in a Continuous Loss Position:
Equity Securities	1,960,000	2,174,000	2,126,000
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral, at Carrying Value	117,723,000	146,722,000	159,742,000
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value	111,957,000	142,982,000	153,364,000
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	3,292,000	3,898,000	4,115,000
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	3,075,000	3,687,000	3,924,000
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	6,268,000	7,866,000	8,444,000
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	5,923,000	7,466,000	8,027,000
Municipal Bonds | State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	131,017,000	163,600,000	169,619,000
Municipal Bonds | Fair Value, Measurements, Recurring | State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	$ 125,813,000	$ 160,470,000	$ 163,849,000