Investment Securities - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	$ 827,253	$ 836,523
AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	504,844	511,470
AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	306,444	309,788
A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	3,000	3,000
Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	12,965	12,265
U.S. government agencies
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	10,270	10,406
U.S. government agencies | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	10,270	10,406
U.S. government agencies | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
U.S. government agencies | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
U.S. government agencies | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
U.S. government agencies | Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, residential
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	326,731	332,509
Mortgage-backed securities, residential | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	326,731	332,509
Mortgage-backed securities, residential | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, residential | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, residential | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, residential | Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Collateralized mortgage obligations, residential
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	12,079	12,243
Collateralized mortgage obligations, residential | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	12,079	12,243
Collateralized mortgage obligations, residential | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Collateralized mortgage obligations, residential | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Collateralized mortgage obligations, residential | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Collateralized mortgage obligations, residential | Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, multifamily
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	4,126	4,145
Mortgage-backed securities, multifamily | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	4,126	4,145
Mortgage-backed securities, multifamily | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, multifamily | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, multifamily | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Mortgage-backed securities, multifamily | Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Obligations of states and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	471,047	474,220
Obligations of states and political subdivisions | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	151,638	152,167
Obligations of states and political subdivisions | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	306,444	309,788
Obligations of states and political subdivisions | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Obligations of states and political subdivisions | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Obligations of states and political subdivisions | Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	12,965	12,265
Corporate bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	3,000	3,000
Corporate bonds | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Corporate bonds | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Corporate bonds | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
Corporate bonds | BB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	3,000	3,000
Corporate bonds | Not Rated
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	$ 0	$ 0