Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Balance sheet assets
Securities available for sale	$ 998,104	$ 1,135,317
Securities held-to-maturity, net	346,436	181,166
Carrying Amount
Balance sheet assets
Securities held-to-maturity, net	345,791	181,166
Other investments	43,106	38,044
Loans held for sale	16,029	5,570
Loans, net	6,029,781	5,271,049
State tax credits held for sale	38,820	36,802
Balance sheet liabilities
Certificates of deposit	659,166	826,447
Subordinated debentures and notes	203,384	141,258
FHLB advances	250,000	222,406
Other borrowings and notes payable	227,961	265,172
Estimated fair value
Balance sheet assets
Securities held-to-maturity, net	356,139	181,939
Other investments	43,106	38,044
Loans held for sale	16,029	5,570
Loans, net	5,876,000	5,205,651
State tax credits held for sale	44,164	39,046
Balance sheet liabilities
Certificates of deposit	665,374	825,203
Subordinated debentures and notes	192,852	130,985
FHLB advances	251,978	221,402
Other borrowings and notes payable	$ 227,961	$ 265,172