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Fair Value of Assets and Liabilities - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets (recorded at amortized cost):    
Investment securities held-to-maturity $ 201,052 $ 115,185
Carrying Amounts | Level 1    
Financial assets (recorded at amortized cost):    
Cash and cash equivalents 584,739 200,320
Carrying Amounts | Level 2    
Financial assets (recorded at amortized cost):    
Investment securities held-to-maturity 196,801 109,036
Interest receivable 10,898 10,922
Financial liabilities (recorded at amortized cost):    
Time deposits 140,173 97,433
Interest payable 82 97
Carrying Amounts | Level 3    
Financial assets (recorded at amortized cost):    
Loans, net 2,294,605 2,065,682
Financial liabilities (recorded at amortized cost):    
Subordinated debenture 0 2,777
Fair Value | Level 1    
Financial assets (recorded at amortized cost):    
Cash and cash equivalents 584,739 200,320
Fair Value | Level 2    
Financial assets (recorded at amortized cost):    
Investment securities held-to-maturity 201,052 115,185
Interest receivable 10,898 10,922
Financial liabilities (recorded at amortized cost):    
Time deposits 140,385 97,769
Interest payable 82 97
Fair Value | Level 3    
Financial assets (recorded at amortized cost):    
Loans, net 2,305,003 2,089,192
Financial liabilities (recorded at amortized cost):    
Subordinated debenture $ 0 $ 3,115