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Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Balance sheet assets    
Securities held-to-maturity, net $ 439,112 $ 488,059
Carrying Amount    
Balance sheet assets    
Securities held-to-maturity, net 438,472 487,610
Other investments 59,156 48,764
Loans held for sale 5,068 13,564
Loans, net 8,964,487 7,088,264
State tax credits held for sale 37,184 36,853
Servicing asset 7,965 5,721
Balance sheet liabilities    
Certificates of deposit 627,171 550,095
Subordinated debentures and notes 204,103 203,637
FHLB advances 50,000 50,000
Other borrowings and notes payable 243,770 301,081
Estimated fair value    
Balance sheet assets    
Securities held-to-maturity, net 444,625 501,523
Other investments 59,156 48,764
Loans held for sale 5,068 13,564
Loans, net 8,954,895 7,067,562
State tax credits held for sale 41,306 39,925
Servicing asset 7,965 5,721
Balance sheet liabilities    
Certificates of deposit 628,425 553,946
Subordinated debentures and notes 193,752 192,889
FHLB advances 51,527 51,871
Other borrowings and notes payable $ 243,770 $ 301,081