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Investment Securities - Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost $ 959,867,000 $ 342,222,000
Allowance for Credit Losses 0 0
Net Carrying Amount 959,867,000 342,222,000
Held-to-maturity, gross unrealized gains 0 3,400,000
Held-to-maturity, gross unrealized losses (130,819,000) (2,867,000)
Held to maturity, fair value 829,048,000 342,755,000
Accrued interest 2,600,000 1,100,000
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 335,959,000 126,990,000
Allowance for Credit Losses 0 0
Net Carrying Amount 335,959,000 126,990,000
Held-to-maturity, gross unrealized gains 0 2,110,000
Held-to-maturity, gross unrealized losses (53,659,000) (712,000)
Held to maturity, fair value 282,300,000 128,388,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 236,061,000 106,851,000
Allowance for Credit Losses 0 0
Net Carrying Amount 236,061,000 106,851,000
Held-to-maturity, gross unrealized gains 0 668,000
Held-to-maturity, gross unrealized losses (30,272,000) (1,045,000)
Held to maturity, fair value 205,789,000 106,474,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 115,043,000 4,866,000
Allowance for Credit Losses 0 0
Net Carrying Amount 115,043,000 4,866,000
Held-to-maturity, gross unrealized gains 0 128,000
Held-to-maturity, gross unrealized losses (6,066,000) 0
Held to maturity, fair value 108,977,000 4,994,000
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 32,070,000  
Allowance for Credit Losses 0  
Net Carrying Amount 32,070,000  
Held-to-maturity, gross unrealized gains 0  
Held-to-maturity, gross unrealized losses (2,204,000)  
Held to maturity, fair value 29,866,000  
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 2,373,000 4,840,000
Allowance for Credit Losses 0 0
Net Carrying Amount 2,373,000 4,840,000
Held-to-maturity, gross unrealized gains 0 198,000
Held-to-maturity, gross unrealized losses (143,000) 0
Held to maturity, fair value 2,230,000 5,038,000
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 145,747,000 51,472,000
Allowance for Credit Losses 0 0
Net Carrying Amount 145,747,000 51,472,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (25,193,000) (901,000)
Held to maturity, fair value 120,554,000 50,571,000
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 62,614,000 47,203,000
Allowance for Credit Losses 0 0
Net Carrying Amount 62,614,000 47,203,000
Held-to-maturity, gross unrealized gains 0 296,000
Held-to-maturity, gross unrealized losses (11,697,000) (209,000)
Held to maturity, fair value 50,917,000 47,290,000
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 30,000,000 $ 0
Allowance for Credit Losses 0  
Net Carrying Amount 30,000,000  
Held-to-maturity, gross unrealized gains 0  
Held-to-maturity, gross unrealized losses (1,585,000)  
Held to maturity, fair value $ 28,415,000