Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance sheet assets
Securities available-for-sale	$ 1,135,317	$ 721,369
Securities held-to-maturity	181,166	65,679
Carrying Amount
Balance sheet assets
Securities held-to-maturity	181,166	65,679
Other investments	38,044	26,654
Loans held for sale	5,570	392
Loans, net	5,271,049	4,306,525
State tax credits held for sale	36,802	37,587
Balance sheet liabilities
Certificates of deposit	826,447	684,429
Subordinated debentures and notes	141,258	118,156
FHLB advances	222,406	70,000
Other borrowings	265,172	223,450
Estimated fair value
Balance sheet assets
Securities held-to-maturity	181,939	63,934
Other investments	38,044	26,654
Loans held for sale	5,570	392
Loans, net	5,205,651	4,253,239
State tax credits held for sale	39,046	39,169
Balance sheet liabilities
Certificates of deposit	825,203	679,491
Subordinated debentures and notes	130,985	106,316
FHLB advances	221,402	70,000
Other borrowings	$ 265,172	$ 223,260