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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
FINANCIAL ASSETS
Securities held for investment, Carrying Amount	$ 1,217	$ 1,428
Loans, net of allowance for loan losses, Carrying Amount	4,989,587	4,924,587
Securities held for investment, Fair Value	1,223	1,433
Loans held for sale, Fair Value	7,719	8,174
FINANCIAL LIABILITIES
Deposits, Carrying Amount	6,706,386	6,605,495
Short-term borrowings, Carrying Amount	5,200	1,675
Junior subordinated debentures, Carrying Amount	26,804	26,804
OFF-BALANCE SHEET FINANCIAL INSTRUMENTS
Loan commitments, Fair Value	2,219	2,158
Letters of credit, Fair Value	410	421
Level 2 Inputs [Member]
FINANCIAL ASSETS
Cash and cash equivalents, Carrying Amount	1,477,405	1,424,255
Securities held for investment, Carrying Amount	717	928
Loans held for sale, Carrying Amount	7,719	8,174
Cash and cash equivalents, Fair Value	1,477,405	1,424,255
Securities held for investment, Fair Value	723	933
Loans held for sale, Fair Value	7,719	8,174
FINANCIAL LIABILITIES
Deposits, Carrying Amount	6,706,386	6,605,495
Short-term borrowings, Carrying Amount	5,200	1,675
Junior subordinated debentures, Carrying Amount	26,804	26,804
Deposits, Fair Value	6,816,792	6,713,542
Short-term borrowings, Fair Value	5,200	1,675
Junior subordinated debentures, Fair Value	29,131	29,549
Level 3 Inputs [Member]
FINANCIAL ASSETS
Securities held for investment, Carrying Amount	500	500
Loans, net of allowance for loan losses, Carrying Amount	4,989,587	4,924,587
Securities held for investment, Fair Value	500	500
Loans, net of allowance for loan losses, Fair Value	$ 4,988,322	$ 4,901,159

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Cash and cash equivalents and federal funds sold fair value disclosure.

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