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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
Jun. 30, 2021
Dec. 31, 2020
Balance sheet assets    
Securities available for sale $ 1,084,223 $ 912,429
Securities held-to-maturity, net 451,114 488,059
Carrying Amount    
Balance sheet assets    
Securities held-to-maturity, net 450,665 487,610
Other investments 50,959 48,764
Loans held for sale 5,763 13,564
Loans, net 7,098,082 7,088,264
State tax credits held for sale 34,710 36,853
Balance sheet liabilities    
Certificates of deposit 514,334 550,095
Subordinated debentures and notes 203,940 203,637
FHLB advances 50,000 50,000
Other borrowings and notes payable 234,509 301,081
Estimated fair value    
Balance sheet assets    
Securities held-to-maturity, net 470,099 501,523
Other investments 50,959 48,764
Loans held for sale 5,763 13,564
Loans, net 7,093,710 7,067,562
State tax credits held for sale 38,629 39,925
Balance sheet liabilities    
Certificates of deposit 515,877 553,946
Subordinated debentures and notes 193,136 192,889
FHLB advances 51,591 51,871
Other borrowings and notes payable $ 234,509 $ 301,081