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FAIR VALUE - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities $ 772,890 $ 372,545
Contractual Balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 422,766 346,248
Available for sale securities 772,890 372,545
Loans held for investment, net of allowance 4,438,591 3,885,872
Accrued interest receivable 40,053 15,468
Deposits 4,988,482 4,068,101
Interest rate swap 1,252  
Accrued interest payable 2,701 4,326
Borrowed funds 155,515 75,503
Subordinated debt 108,322 107,799
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 422,766 346,248
Available for sale securities 772,890 372,545
Loans held for investment, net of allowance 4,431,816 3,918,210
Accrued interest receivable 40,053 15,468
Deposits 5,003,594 4,073,031
Interest rate swap 1,252  
Accrued interest payable 2,701 4,326
Borrowed funds 144,629 83,302
Subordinated debt 109,832 109,607
Fair Value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 422,766 346,248
Available for sale securities 0 0
Loans held for investment, net of allowance 0 0
Accrued interest receivable 2 13
Deposits 0 0
Accrued interest payable 0 0
Borrowed funds 0 0
Subordinated debt 0 0
Fair Value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0 0
Available for sale securities 772,890 372,545
Loans held for investment, net of allowance 0 0
Accrued interest receivable 5,531 1,783
Deposits 5,003,594 4,073,031
Interest rate swap 1,252  
Accrued interest payable 2,701 4,326
Borrowed funds 144,629 83,302
Subordinated debt 109,832 109,607
Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0 0
Available for sale securities 0 0
Loans held for investment, net of allowance 4,431,816 3,918,210
Accrued interest receivable 34,520 13,672
Deposits 0 0
Accrued interest payable 0 0
Borrowed funds 0 0
Subordinated debt $ 0 $ 0