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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Apr. 01, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities      
Within one year, amortized cost $ 0    
Within one year, estimated fair value 0    
After one year through five years, amortized cost 0    
After one year through five years, estimated fair value 0    
After five years through ten years, amortized cost 46,640    
After five years through ten years, estimated fair value 38,868    
After ten years, amortized cost 183,069    
After ten years, estimated fair value 152,279    
Total securities with single maturity date, amortized cost 229,709    
Total securities with single maturity date, estimated fair value 191,147    
Debt securities, amortized cost 772,677   $ 1,098,373
Available-for-sale debt securities 668,300   1,109,208
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 0    
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One 0    
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 124    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five 131    
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield 49,810    
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 44,318    
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 119,437    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 142,034    
Held-to-maturity investment securities 163,879    
Held-to-maturity investment securities 191,975 $ 306,700  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 305,482   0
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 267,443    
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Investment securities not due at a single maturity date, amortized cost 344    
Investment securities not due at a single maturity date, estimated fair value 333    
Debt securities, amortized cost 344   373
Available-for-sale debt securities 333   379
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Investment securities not due at a single maturity date, amortized cost 123,093    
Investment securities not due at a single maturity date, estimated fair value 115,340    
Debt securities, amortized cost 123,093   213,471
Available-for-sale debt securities 115,340   214,439
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 10,350    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 9,033    
Private label mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Investment securities not due at a single maturity date, amortized cost 419,531    
Investment securities not due at a single maturity date, estimated fair value 361,480    
Debt securities, amortized cost 419,531   317,089
Available-for-sale debt securities 361,481   313,220
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 57,201    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 51,168    
Corporate debt securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost     44,500
Available-for-sale debt securities     $ 44,778
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 45,956    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 43,363