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Investment Securities - Amortized Cost and Fair Values of Debt Securities Held to Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 419,009 $ 461,162
Gross Unrealized Gains 0 0
Gross Unrealized Losses (68,414) (74,957)
Estimated Fair Value 350,595 386,205
ERROR in label resolution.    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,000 1,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (36) (40)
Estimated Fair Value 964 960
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 25,561 26,643
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2,412) (2,865)
Estimated Fair Value 23,149 23,778
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 69,502 75,229
Gross Unrealized Gains 0 0
Gross Unrealized Losses (14,435) (14,196)
Estimated Fair Value 55,067 61,033
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,190 4,794
Gross Unrealized Gains 0 0
Gross Unrealized Losses (30) (129)
Estimated Fair Value 2,160 4,665
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,781 2,008
Gross Unrealized Gains 0 0
Gross Unrealized Losses (175) (224)
Estimated Fair Value 1,606 1,784
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 296,432 329,267
Gross Unrealized Gains 0 0
Gross Unrealized Losses (47,148) (53,002)
Estimated Fair Value 249,284 276,265
Other Government - Sponsored Enterprises [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 22,543 22,221
Gross Unrealized Gains 0 0
Gross Unrealized Losses (4,178) (4,501)
Estimated Fair Value $ 18,365 $ 17,720