Disclosure About Fair Values of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Investment securities available-for-sale	$ 1,187,252	$ 1,257,063
Derivative assets	11,136	3,958
Liabilities
Derivative liabilities	32,350	25,280
Carrying Value
Assets
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
Derivative assets	11,136	3,958
Net profits interests	5,779	15,833
Investments in limited partnerships	36,917
Liabilities
Derivative liabilities	32,350	25,280
Level 1
Assets
Equity securities with readily determinable fair values not held for trading	5,840	5,885
Level 2
Assets
Investment securities available-for-sale	1,187,252	1,257,063
Derivative assets	11,136	3,958
Liabilities
Derivative liabilities	32,350	25,280
Level 3
Assets
Net profits interests	5,779	15,833
Investments in limited partnerships	36,917
Fair Value, Measurements, Recurring | Carrying Value
Assets
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
Derivative assets	11,136	3,958
Net profits interests	5,779	15,833
Investments in limited partnerships	11,191
Total recurring basis measured assets	1,221,198	1,282,739
Liabilities
Derivative liabilities	32,350	25,280
Total recurring basis measured liabilities	32,350	25,280
Fair Value, Measurements, Recurring | Level 1
Assets
Equity securities with readily determinable fair values not held for trading	5,840	5,885
Total recurring basis measured assets	5,840	5,885
Fair Value, Measurements, Recurring | Level 2
Assets
Investment securities available-for-sale	1,187,252	1,257,063
Derivative assets	11,136	3,958
Total recurring basis measured assets	1,198,388	1,261,021
Liabilities
Derivative liabilities	32,350	25,280
Total recurring basis measured liabilities	32,350	25,280
Fair Value, Measurements, Recurring | Level 3
Assets
Net profits interests	5,779	15,833
Investments in limited partnerships	11,191
Total recurring basis measured assets	$ 16,970	$ 15,833