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Investment Securities - Contractual Maturities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due in one year or less $ 7,009,000  
Due after one year through five years 28,441,000  
Due after five years through ten years 71,319,000  
Due after ten years 156,528,000  
Total investment securities due at a single maturity date 263,297,000  
Mortgage-backed securities 620,535,000  
Amortized Cost 883,832,000 $ 770,195,000
Fair Value    
Due in one year or less 7,095,000  
Due after one year through five years 29,608,000  
Due after five years through ten years 74,089,000  
Due after ten years 160,798,000  
Total investment securities due at a single maturity date 271,590,000  
Mortgage-backed securities 622,745,000  
Fair Value 894,335,000 802,163,000
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 68,210,000  
Due after ten years 72,801,000  
Total investment securities due at a single maturity date 141,011,000  
Mortgage-backed securities 242,382,000  
Total 383,393,000 0
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 68,014,000  
Due after ten years 71,349,000  
Total investment securities due at a single maturity date 139,363,000  
Mortgage-backed securities 236,968,000  
Total $ 376,331,000 $ 0