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Investment Securities - Amortized cost of held to maturity debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis $ 64,967 $ 63,979
AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 63,552  
Unrated    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 1,415  
U.S. Agency    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 2,500 2,500
U.S. Agency | AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 2,500  
U.S. Agency mortgage-backed securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 25,273 24,222
U.S. Agency mortgage-backed securities | AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 25,273  
Municipal    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 32,779 32,787
Municipal | AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 32,779  
Corporate bonds and other securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 4,415 $ 4,470
Corporate bonds and other securities | AAA/AA/A    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis 3,000  
Corporate bonds and other securities | Unrated    
Schedule of Held-to-Maturity Securities [Line Items]    
Investment securities held to maturity, Cost Basis $ 1,415