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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 105,317 $ 16,233
Less than 12 months, Unrealized Losses (2,460) (90)
12 months or longer, Estimated Fair Value 2,225 5,320
12 months or longer, Unrealized Losses (51) (101)
Total, Estimated Fair Value 107,542 21,553
Total, Unrealized Losses (2,511) (191)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 38,199  
Less than 12 months, unrealized losses (1,354)  
Total Estimated fair value 38,199  
Total, Unrealized Losses (1,354)  
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 17,529  
Less than 12 months, Unrealized Losses (555)  
Total, Estimated Fair Value 17,529  
Total, Unrealized Losses (555)  
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 9,882  
Less than 12 months, unrealized losses (509)  
Total Estimated fair value 9,882  
Total, Unrealized Losses (509)  
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 23,306 1,998
Less than 12 months, Unrealized Losses (686) (10)
Total, Estimated Fair Value 23,306 1,998
Total, Unrealized Losses (686) (10)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 7,468  
Less than 12 months, unrealized losses (220)  
Total Estimated fair value 7,468  
Total, Unrealized Losses (220)  
Real estate mortgage investment conduits    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 25,462  
Less than 12 months, Unrealized Losses [1] (480)  
Total, Estimated Fair Value [1] 25,462  
Total, Unrealized Losses [1] (480)  
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value [2] 9,066  
Less than 12 months, unrealized losses [2] (141)  
Total Estimated fair value [2] 9,066  
Total, Unrealized Losses [2] (141)  
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 33,164 2,509 [3]
Less than 12 months, Unrealized Losses (614) (22) [3]
12 months or longer, Estimated Fair Value [3]   409
12 months or longer, Unrealized Losses [3]   (8)
Total, Estimated Fair Value 33,164 2,918 [3]
Total, Unrealized Losses (614) (30) [3]
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value [3] 6,035  
Less than 12 months, unrealized losses [3] (119)  
Total Estimated fair value [3] 6,035  
Total, Unrealized Losses [3] (119)  
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 5,856 [4] 11,726 [5]
Less than 12 months, Unrealized Losses (125) [4] (58) [5]
12 months or longer, Estimated Fair Value 2,225 [4] 4,911 [5]
12 months or longer, Unrealized Losses (51) [4] (93) [5]
Total, Estimated Fair Value 8,081 [4] 16,637 [5]
Total, Unrealized Losses (176) [4] $ (151) [5]
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 5,748  
Less than 12 months, unrealized losses (365)  
Total Estimated fair value 5,748  
Total, Unrealized Losses $ (365)  
[1] Comprised of FHLMC, FNMA and GNMA issued securities.
[2] Comprised of FNMA issued securities.
[3] Comprised of FHLMC and FNMA issued securities.
[4] Comprised of SBA issued securities.
[5] Comprised of SBA and CRE secured securities issued by FNMA.