Disclosure About Fair Values of Financial Instruments - Summary of Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Assets:
Interest-bearing deposits with banks	$ 523,436	$ 482,568
Federal funds sold	18,502	9,536
Investment securities available-for-sale	1,187,252	1,257,063
Derivative assets	11,136	3,958
Investment securities available-for-sale	1,187,252	1,257,063
Estimated fair value of held-to-maturity securities		311
Financial Liabilities:
Advances from FHLB	150,000	150,000
Securities sold under agreements to repurchase	1,106	1,026
Senior debt	184,801	184,629
Subordinated debt	98,910	98,687
Junior subordinated debentures	36,953	36,472
Derivative liabilities	32,350	25,280
Level 1
Financial Assets:
Cash and due from banks	237,342	238,707
Interest-bearing deposits with banks	523,436	482,568
Federal funds sold	18,502	9,536
Equity securities with readily determinable fair values not held for trading	5,840	5,885
Level 2
Financial Assets:
Investment securities available-for-sale	1,187,252	1,257,063
Loans held for sale	59,461	61,359
Derivative assets	11,136	3,958
Investment securities available-for-sale	1,187,252	1,257,063
Estimated fair value of held-to-maturity securities		311
Financial Liabilities:
Deposits	10,700,350	9,006,890
Advances from FHLB	150,000	150,000
Securities sold under agreements to repurchase	1,106	1,026
Senior debt	194,762	194,484
Subordinated debt	103,008	94,724
Junior subordinated debentures	46,946	49,161
Derivative liabilities	32,350	25,280
Level 3
Financial Assets:
Net loans	9,735,130	8,134,903
Net profits interests	5,779	15,833
Investments in limited partnerships	36,917
Carrying Value
Financial Assets:
Cash and due from banks	237,342	238,707
Interest-bearing deposits with banks	523,436	482,568
Federal funds sold	18,502	9,536
Investment securities available-for-sale	1,187,252	1,257,063
Equity securities with readily determinable fair values not held for trading	5,840	5,885
Loans held for sale	59,461	61,359
Net loans	9,959,545	8,165,851
Derivative assets	11,136	3,958
Net profits interests	5,779	15,833
Investments in limited partnerships	36,917
Investment securities available-for-sale	1,187,252	1,257,063
Estimated fair value of held-to-maturity securities		290
Financial Liabilities:
Deposits	10,708,689	9,011,515
Advances from FHLB	150,000	150,000
Securities sold under agreements to repurchase	1,106	1,026
Senior debt	184,801	184,629
Subordinated debt	98,910	98,687
Junior subordinated debentures	36,953	36,472
Derivative liabilities	32,350	25,280
Fair Value
Financial Assets:
Cash and due from banks	237,342	238,707
Interest-bearing deposits with banks	523,436	482,568
Federal funds sold	18,502	9,536
Investment securities available-for-sale	1,187,252	1,257,063
Equity securities with readily determinable fair values not held for trading	5,840	5,885
Loans held for sale	59,461	61,359
Net loans	9,735,130	8,134,903
Derivative assets	11,136	3,958
Net profits interests	5,779	15,833
Investments in limited partnerships	36,917
Investment securities available-for-sale	1,187,252	1,257,063
Estimated fair value of held-to-maturity securities		311
Financial Liabilities:
Deposits	10,700,350	9,006,890
Advances from FHLB	150,000	150,000
Securities sold under agreements to repurchase	1,106	1,026
Senior debt	194,762	194,484
Subordinated debt	103,008	94,724
Junior subordinated debentures	46,946	49,161
Derivative liabilities	$ 32,350	$ 25,280