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SECURITIES - Amortized cost and Fair values of held-to-maturity securities transferred from available-for-sale securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Held-to-maturity            
Debt securities held-to-maturity $ 546,694   $ 336,185      
Fair Value 481,692   336,027      
U.S. government agency            
Held-to-maturity            
Debt securities held-to-maturity 88,418   12,349      
Fair Value 78,076   12,340      
Mortgage-backed: Agency residential            
Held-to-maturity            
Debt securities held-to-maturity 105,330   20,555      
Fair Value 98,839   20,649      
Mortgage-backed: Agency commercial            
Held-to-maturity            
Debt securities held-to-maturity 310,102   287,615      
Fair Value $ 263,240   $ 286,563      
Debt Securities Transferred            
Held-to-maturity            
Debt securities held-to-maturity   $ 114,850     $ 99,271 $ 135,161
Fair Value   104,131   $ 99,275   129,720
Debt Securities Transferred | U.S. government agency            
Held-to-maturity            
Debt securities held-to-maturity   78,841       7,593
Fair Value   71,048       7,323
Debt Securities Transferred | Mortgage-backed: Agency residential            
Held-to-maturity            
Debt securities held-to-maturity   8,175       8,776
Fair Value   7,651       8,536
Debt Securities Transferred | Mortgage-backed: Agency commercial            
Held-to-maturity            
Debt securities held-to-maturity   27,834     $ 99,271 118,792
Fair Value   $ 25,432   $ 99,275   $ 113,861