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Investment Securities - Securities with unrealized and unrecognized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investment securities    
Fair Value, Less than 12 Months $ 110,235 $ 267,396
Fair Value, 12 Months or More 391,434 252,688
Fair Value, Total 501,669 520,084
Unrealized Losses, Less than 12 Months (3,326) (22,323)
Unrealized Losses, 12 Months or More (61,158) (54,260)
Unrealized Losses, Total (64,484) (76,583)
U.S. government agencies and treasuries    
Investment securities    
Fair Value, Less than 12 Months 32,615 47,064
Fair Value, 12 Months or More 56,508 41,718
Fair Value, Total 89,123 88,782
Unrealized Losses, Less than 12 Months (448) (2,414)
Unrealized Losses, 12 Months or More (8,090) (8,595)
Unrealized Losses, Total (8,538) (11,009)
Mortgage-backed securities    
Investment securities    
Fair Value, Less than 12 Months 58,650 150,542
Fair Value, 12 Months or More 253,124 165,336
Fair Value, Total 311,774 315,878
Unrealized Losses, Less than 12 Months (1,597) (12,139)
Unrealized Losses, 12 Months or More (38,696) (35,653)
Unrealized Losses, Total (40,293) (47,792)
Corporate Bonds    
Investment securities    
Fair Value, Less than 12 Months 7,679 12,503
Fair Value, 12 Months or More 8,347 13,155
Fair Value, Total 16,026 25,658
Unrealized Losses, Less than 12 Months (821) (1,007)
Unrealized Losses, 12 Months or More (1,944) (1,894)
Unrealized Losses, Total (2,765) (2,901)
Obligations of states and political subdivisions    
Investment securities    
Fair Value, Less than 12 Months 11,291 57,287
Fair Value, 12 Months or More 73,455 32,479
Fair Value, Total 84,746 89,766
Unrealized Losses, Less than 12 Months (460) (6,763)
Unrealized Losses, 12 Months or More (12,428) (8,118)
Unrealized Losses, Total $ (12,888) $ (14,881)