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Investment Securities - Fair value of securities held-to-maturity and available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months $ 8,156 $ 94,506
Fair Value, 12 Months or Longer 73,609 8,751
Fair Value 81,765 103,257
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,620) (2,035)
Gross Unrealized Losses, 12 Months or Longer (17,213) (216)
Gross Unrealized Losses (18,833) (2,251)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 252,199 168,443
Fair Value, 12 Months or Longer 114,347 7,795
Fair Value 366,546 176,238
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (19,825) (2,723)
Gross Unrealized Losses, 12 Months or Longer (19,655) (269)
Gross Unrealized Losses (39,480) (2,992)
U.S Treasuries    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months   5,851
Fair Value, 12 Months or Longer 5,105  
Fair Value 5,105 5,851
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months   (150)
Gross Unrealized Losses, 12 Months or Longer (895)  
Gross Unrealized Losses (895) (150)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 39,019 30,543
Fair Value, 12 Months or Longer 19,800  
Fair Value 58,819 30,543
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (2,025) (411)
Gross Unrealized Losses, 12 Months or Longer (2,560)  
Gross Unrealized Losses (4,585) (411)
U.S. government and federal agencies    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 834 31,617
Fair Value, 12 Months or Longer 28,436 3,376
Fair Value 29,270 34,993
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (166) (645)
Gross Unrealized Losses, 12 Months or Longer (6,152) (81)
Gross Unrealized Losses (6,318) (726)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 20,293 14,154
Fair Value, 12 Months or Longer 14,163 6,877
Fair Value 34,456 21,031
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,831) (301)
Gross Unrealized Losses, 12 Months or Longer (2,430) (223)
Gross Unrealized Losses (4,261) (524)
Collateralized mortgage obligations    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 5,679 25,072
Fair Value, 12 Months or Longer 12,090  
Fair Value 17,769 25,072
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,126) (534)
Gross Unrealized Losses, 12 Months or Longer (3,029)  
Gross Unrealized Losses (4,155) (534)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 20,001 30,352
Fair Value, 12 Months or Longer 20,210  
Fair Value 40,211 30,352
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,507) (726)
Gross Unrealized Losses, 12 Months or Longer (4,470)  
Gross Unrealized Losses (5,977) (726)
Taxable municipal    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months   3,971
Fair Value, 12 Months or Longer 4,736 1,923
Fair Value 4,736 5,894
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months   (133)
Gross Unrealized Losses, 12 Months or Longer (1,340) (61)
Gross Unrealized Losses (1,340) (194)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 336 265
Fair Value, 12 Months or Longer 242  
Fair Value 578 265
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (2) (5)
Gross Unrealized Losses, 12 Months or Longer (28)  
Gross Unrealized Losses (30) (5)
Mortgage-backed    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 1,643 27,995
Fair Value, 12 Months or Longer 23,242 3,452
Fair Value 24,885 31,447
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (328) (573)
Gross Unrealized Losses, 12 Months or Longer (5,797) (74)
Gross Unrealized Losses (6,125) (647)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 165,485 93,129
Fair Value, 12 Months or Longer 59,932 918
Fair Value 225,417 94,047
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (13,529) (1,280)
Gross Unrealized Losses, 12 Months or Longer (10,167) (46)
Gross Unrealized Losses (23,696) $ (1,326)
Corporate bonds    
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 2,692  
Fair Value 2,692  
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (308)  
Gross Unrealized Losses (308)  
Tax-exempt municipal    
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 4,373  
Fair Value 4,373  
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (623)  
Gross Unrealized Losses $ (623)