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Investment Securities - Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost $ 931,587,000 $ 342,222,000
Allowance for Credit Losses 0 0
Net Carrying Amount 931,587,000 342,222,000
Held-to-maturity, gross unrealized gains 1,048,000 3,400,000
Held-to-maturity, gross unrealized losses (85,249,000) (2,867,000)
Held to maturity, fair value 847,386,000 342,755,000
Accrued interest 3,100,000 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 337,998,000 126,990,000
Allowance for Credit Losses 0 0
Net Carrying Amount 337,998,000 126,990,000
Held-to-maturity, gross unrealized gains 4,000 2,110,000
Held-to-maturity, gross unrealized losses (34,731,000) (712,000)
Held to maturity, fair value 303,271,000 128,388,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 230,553,000 106,851,000
Allowance for Credit Losses 0 0
Net Carrying Amount 230,553,000 106,851,000
Held-to-maturity, gross unrealized gains 172,000 668,000
Held-to-maturity, gross unrealized losses (20,766,000) (1,045,000)
Held to maturity, fair value 209,959,000 106,474,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 118,956,000 4,866,000
Allowance for Credit Losses 0 0
Net Carrying Amount 118,956,000 4,866,000
Held-to-maturity, gross unrealized gains 853,000 128,000
Held-to-maturity, gross unrealized losses (2,574,000) 0
Held to maturity, fair value 117,235,000 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 12,329,000  
Allowance for Credit Losses 0  
Net Carrying Amount 12,329,000  
Held-to-maturity, gross unrealized gains 0  
Held-to-maturity, gross unrealized losses (982,000)  
Held to maturity, fair value 11,347,000  
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 3,244,000 4,840,000
Allowance for Credit Losses 0 0
Net Carrying Amount 3,244,000 4,840,000
Held-to-maturity, gross unrealized gains 0 198,000
Held-to-maturity, gross unrealized losses (66,000) 0
Held to maturity, fair value 3,178,000 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 135,678,000 51,472,000
Allowance for Credit Losses 0 0
Net Carrying Amount 135,678,000 51,472,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (17,457,000) (901,000)
Held to maturity, fair value 118,221,000 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 62,829,000 47,203,000
Allowance for Credit Losses 0 0
Net Carrying Amount 62,829,000 47,203,000
Held-to-maturity, gross unrealized gains 19,000 296,000
Held-to-maturity, gross unrealized losses (8,304,000) (209,000)
Held to maturity, fair value 54,544,000 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 (369,000)  
Held to maturity, fair value $ 29,631,000