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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
Mar. 31, 2021
Dec. 31, 2020
Balance sheet assets    
Securities available for sale $ 945,660 $ 912,429
Securities held-to-maturity, net 467,508 488,059
Carrying Amount    
Balance sheet assets    
Securities held-to-maturity, net 467,059 487,610
Other investments 51,099 48,764
Loans held for sale 8,531 13,564
Loans, net 7,157,254 7,088,264
State tax credits held for sale 34,287 36,853
Balance sheet liabilities    
Certificates of deposit 521,351 550,095
Subordinated debentures and notes 203,778 203,637
FHLB advances 50,000 50,000
Other borrowings and notes payable 229,389 301,081
Estimated fair value    
Balance sheet assets    
Securities held-to-maturity, net 470,099 501,523
Other investments 51,099 48,764
Loans held for sale 8,531 13,564
Loans, net 7,099,662 7,067,562
State tax credits held for sale 37,802 39,925
Balance sheet liabilities    
Certificates of deposit 525,000 553,946
Subordinated debentures and notes 193,071 192,889
FHLB advances 51,694 51,871
Other borrowings and notes payable $ 229,389 $ 301,081