Investment Securities (Credit Quality Information) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	$ 523,177	$ 559,455
Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	511,206
Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	1,471
A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	4,000
Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	4,000
Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	500
NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	2,000
U.S. Government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	143,494	148,097
U.S. Government agencies | Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	143,494
U.S. Government agencies | Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
U.S. Government agencies | A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
U.S. Government agencies | Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
U.S. Government agencies | Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
U.S. Government agencies | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Mortgage-backed-residential
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	367,712	398,884
Mortgage-backed-residential | Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	367,712
Mortgage-backed-residential | Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Mortgage-backed-residential | A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Mortgage-backed-residential | Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Mortgage-backed-residential | Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Mortgage-backed-residential | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
States and political subdivisions
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	1,471	1,474
States and political subdivisions | Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
States and political subdivisions | Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	1,471
States and political subdivisions | A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
States and political subdivisions | Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
States and political subdivisions | Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
States and political subdivisions | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Other debt securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	10,500	$ 11,000
Other debt securities | Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Other debt securities | Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	0
Other debt securities | A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	4,000
Other debt securities | Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	4,000
Other debt securities | Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	500
Other debt securities | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost	$ 2,000