Investment Securities (Credit Quality Information) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-maturity Securities, Amortized Cost	$ 536,970	$ 559,455
Held-to-Maturity, Amortized cost	537,133	559,455
Speculative
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-maturity Securities, Amortized Cost	0	0
Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	137,359
Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	1,472
A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	4,000
Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	4,000
Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	500
Baa3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	500
NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	389,302
U.S. Government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	144,882	148,097
U.S. Government agencies | Aaa
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	137,359
U.S. Government agencies | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	7,523
Mortgage-backed
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	379,779	398,884
Mortgage-backed | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	379,779
States and political subdivisions
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	1,472	1,474
States and political subdivisions | Aa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	1,472
Other debt securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	11,000	$ 11,000
Other debt securities | A3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	4,000
Other debt securities | Baa1
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	4,000
Other debt securities | Baa2
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	500
Other debt securities | Baa3
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	500
Other debt securities | NR
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Held-to-Maturity, Amortized cost	$ 2,000