Investment Securities - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	$ 940,985	$ 825,137
AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	573,967	549,327
AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	319,005	270,909
A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	1,056	1,068
BBB
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	43,957	833
U.S. Treasury and U.S. government agencies
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	21,795	18,672
U.S. Treasury and U.S. government agencies | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	21,795	18,672
U.S. Treasury and U.S. government agencies | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
U.S. Treasury and U.S. government agencies | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
U.S. Treasury and U.S. government agencies | BBB
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	0	0
U.S. Treasury and 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	367,084	370,247
Mortgage-backed securities, residential | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	367,084	370,247
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 | BBB
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	14,433	13,921
Collateralized mortgage obligations, residential | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	14,433	13,921
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 | BBB
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	4,270	2,710
Mortgage-backed securities, multifamily | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	4,270	2,710
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 | BBB
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	530,403	416,587
Obligations of states and political subdivisions | AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	166,385	143,777
Obligations of states and political subdivisions | AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	319,005	270,909
Obligations of states and political subdivisions | A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total	1,056	1,068
Obligations of states and political subdivisions | BBB
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	43,957	833
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 | BBB
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