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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying amount and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financial assets:    
Debt securities held-to-maturity $ 195,608 $ 72,441
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 429,736 312,451
Level 1 | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 429,736 312,451
Level 2 | Carrying Amount    
Financial assets:    
Debt securities held-to-maturity 192,994 68,395
Accrued interest receivable 12,718 14,255
Financial liabilities:    
Securities sold under agreements to repurchase 41,976 45,736
Accrued interest payable 551 1,151
Level 2 | Estimated Fair Value    
Financial assets:    
Debt securities held-to-maturity 195,608 72,441
Accrued interest receivable 12,718 14,255
Financial liabilities:    
Securities sold under agreements to repurchase 41,976 45,736
Accrued interest payable 551 1,151
Level 3 | Carrying Amount    
Financial assets:    
Restricted stock 2,498 2,498
Loans, net 2,241,946 2,215,168
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 285,461 299,474
Level 3 | Estimated Fair Value    
Financial assets:    
Restricted stock 2,498 2,498
Loans, net 2,264,145 2,235,767
Investments in unconsolidated subsidiaries 1,165 1,165
Financial liabilities:    
Time deposits 286,430 300,989
Subordinated Notes | Level 3 | Carrying Amount    
Financial liabilities:    
Subordinated debt 39,257 39,238
Subordinated Notes | Level 3 | Estimated Fair Value    
Financial liabilities:    
Subordinated debt 38,162 38,403
Junior Subordinated Debentures Issued | Level 3 | Carrying Amount    
Financial liabilities:    
Subordinated debt 37,665 37,648
Junior Subordinated Debentures Issued | Level 3 | Estimated Fair Value    
Financial liabilities:    
Subordinated debt $ 23,528 $ 23,766