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Investment Securities - Fair value of securities held-to-maturity and available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months $ 64,331 $ 94,506
Fair Value, 12 Months or Longer 30,720 8,751
Fair Value 95,051 103,257
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (6,000) (2,035)
Gross Unrealized Losses, 12 Months or Longer (3,126) (216)
Gross Unrealized Losses (9,126) (2,251)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 239,755 168,443
Fair Value, 12 Months or Longer 30,400 7,795
Fair Value 270,155 176,238
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (11,585) (2,723)
Gross Unrealized Losses, 12 Months or Longer (2,882) (269)
Gross Unrealized Losses (14,467) (2,992)
U.S Treasuries    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 5,510 5,851
Fair Value 5,510 5,851
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (491) (150)
Gross Unrealized Losses (491) (150)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 40,683 30,543
Fair Value 40,683 30,543
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (2,203) (411)
Gross Unrealized Losses (2,203) (411)
U.S. government and federal agencies    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 19,818 31,617
Fair Value, 12 Months or Longer 12,894 3,376
Fair Value 32,712 34,993
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,796) (645)
Gross Unrealized Losses, 12 Months or Longer (1,165) (81)
Gross Unrealized Losses (2,961) (726)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 17,569 14,154
Fair Value, 12 Months or Longer 13,370 6,877
Fair Value 30,939 21,031
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (619) (301)
Gross Unrealized Losses, 12 Months or Longer (1,222) (223)
Gross Unrealized Losses (1,841) (524)
Collateralized mortgage obligations    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 20,407 25,072
Fair Value, 12 Months or Longer 1,618  
Fair Value 22,025 25,072
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,918) (534)
Gross Unrealized Losses, 12 Months or Longer (176)  
Gross Unrealized Losses (2,094) (534)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 33,514 30,352
Fair Value, 12 Months or Longer 3,284  
Fair Value 36,798 30,352
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (2,230) (726)
Gross Unrealized Losses, 12 Months or Longer (326)  
Gross Unrealized Losses (2,556) (726)
Taxable municipal    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 1,367 3,971
Fair Value, 12 Months or Longer 4,056 1,923
Fair Value 5,423 5,894
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (184) (133)
Gross Unrealized Losses, 12 Months or Longer (478) (61)
Gross Unrealized Losses (662) (194)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months   265
Fair Value, 12 Months or Longer 252  
Fair Value 252 265
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months   (5)
Gross Unrealized Losses, 12 Months or Longer (18)  
Gross Unrealized Losses (18) (5)
Mortgage-backed    
Held-to-maturity, Fair Value    
Fair Value, Less than 12 Months 17,229 27,995
Fair Value, 12 Months or Longer 12,152 3,452
Fair Value 29,381 31,447
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (1,611) (573)
Gross Unrealized Losses, 12 Months or Longer (1,307) (74)
Gross Unrealized Losses (2,918) (647)
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 143,279 93,129
Fair Value, 12 Months or Longer 13,494 918
Fair Value 156,773 94,047
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (6,306) (1,280)
Gross Unrealized Losses, 12 Months or Longer (1,316) (46)
Gross Unrealized Losses (7,622) $ (1,326)
Corporate bonds    
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 1,965  
Fair Value 1,965  
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (35)  
Gross Unrealized Losses (35)  
Tax-exempt municipal    
Available-for-sale, Fair Value    
Fair Value, Less than 12 Months 2,745  
Fair Value 2,745  
Gross Unrealized Losses    
Gross Unrealized Losses, Less than 12 Months (192)  
Gross Unrealized Losses $ (192)