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Investment Securities - Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost $ 151,970,000 $ 109,036,000
Allowance for Credit Losses 0 0
Net Carrying Amount 151,970,000 109,036,000
Held-to-maturity, gross unrealized gains 4,975,000 6,149,000
Held-to-maturity, gross unrealized losses (189,000) 0
Held to maturity, fair value 156,756,000 115,185,000
Accrued interest 295,000 366,000
MBS pass-through securities issued by FHLMC and FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 78,227,000 65,579,000
Allowance for Credit Losses 0 0
Net Carrying Amount 78,227,000 65,579,000
Held-to-maturity, gross unrealized gains 3,283,000 3,924,000
Held-to-maturity, gross unrealized losses 0 0
Held to maturity, fair value 81,510,000 69,503,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 30,207,000 27,201,000
Allowance for Credit Losses 0 0
Net Carrying Amount 30,207,000 27,201,000
Held-to-maturity, gross unrealized gains 1,105,000 1,441,000
Held-to-maturity, gross unrealized losses (189,000) 0
Held to maturity, fair value 31,123,000 28,642,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 7,305,000 8,042,000
Allowance for Credit Losses 0 0
Net Carrying Amount 7,305,000 8,042,000
Held-to-maturity, gross unrealized gains 347,000 363,000
Held-to-maturity, gross unrealized losses 0 0
Held to maturity, fair value 7,652,000 8,405,000
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 5,699,000 6,547,000
Allowance for Credit Losses 0 0
Net Carrying Amount 5,699,000 6,547,000
Held-to-maturity, gross unrealized gains 227,000 400,000
Held-to-maturity, gross unrealized losses 0 0
Held to maturity, fair value 5,926,000 6,947,000
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 29,950,000  
Allowance for Credit Losses 0  
Net Carrying Amount 29,950,000  
Held-to-maturity, gross unrealized gains 0  
Held-to-maturity, gross unrealized losses 0  
Held to maturity, fair value 29,950,000  
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 582,000 1,667,000
Allowance for Credit Losses 0 0
Net Carrying Amount 582,000 1,667,000
Held-to-maturity, gross unrealized gains 13,000 21,000
Held-to-maturity, gross unrealized losses 0 0
Held to maturity, fair value $ 595,000 $ 1,688,000