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Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income | $ 19,497 | $ 21,710 | $ 23,182 | $ 22,050 | $ 18,620 | $ 17,982 | $ 17,493 | $ 16,579 | $ 86,439 | $ 70,674 | $ 66,170
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Amortization of stock-based compensation arrangements |  |  |  |  |  |  |  |  | 1,180 | 1,636 | 1,717
Other, net |  |  |  |  |  |  |  |  | (1,173) | (5,500) | 6,301
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 104,525 | 90,541 | 78,159
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net cash and due from banks paid for acquisitions |  |  |  |  |  |  |  |  |  |  | (4,007)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (344,560) | (98,017) | (265,298)
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  | 4,844 | 13,354 | 4,428
Common stock acquired |  |  |  |  |  |  |  |  |  | (5,523) | (1,654)
Cash dividends paid |  |  |  |  |  |  |  |  | (24,783) | (22,770) | (21,449)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 147,449 | 259,760 | (128,579)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits |  |  |  |  |  |  |  |  | (92,586) | 252,284 | (315,718)
Cash, due from banks and interest-bearing deposits at the beginning of the period |  |  |  | 1,850,461 |  |  |  | 1,598,177 | 1,850,461 | 1,598,177 | 1,913,895
Cash, due from banks and interest-bearing deposits at the end of the period | 1,757,875 |  |  |  | 1,850,461 |  |  |  | 1,757,875 | 1,850,461 | 1,598,177
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  | 20,563 | 14,673 | 12,255
Cash received during the period for income taxes, net |  |  |  |  |  |  |  |  | 41,058 | 32,700 | 33,531
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 86,439 | 70,674 | 66,170
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (57,429) | (44,172) | (44,653)
Amortization of stock-based compensation arrangements |  |  |  |  |  |  |  |  | 1,142 | 401 | 1,172
Other, net |  |  |  |  |  |  |  |  | 569 | 136 | (343)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 30,721 | 27,039 | 22,346
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net cash and due from banks paid for acquisitions |  |  |  |  |  |  |  |  |  |  | 5,066
Payments for investments in subsidiaries |  |  |  |  |  |  |  |  | (502) |  |
Sales and maturities of held for investment and available for sale securities |  |  |  |  |  |  |  |  | 100 |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (402) |  | 5,066
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  | 4,844 | 13,354 | 4,428
Common stock acquired |  |  |  |  |  |  |  |  |  | (5,523) | (1,654)
Cash dividends paid |  |  |  |  |  |  |  |  | (24,783) | (22,770) | (21,449)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (19,939) | (14,939) | (18,675)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits |  |  |  |  |  |  |  |  | 10,380 | 12,100 | 8,737
Cash, due from banks and interest-bearing deposits at the beginning of the period |  |  |  | $ 57,537 |  |  |  | $ 45,437 | 57,537 | 45,437 | 36,700
Cash, due from banks and interest-bearing deposits at the end of the period | $ 67,917 |  |  |  | $ 57,537 |  |  |  | 67,917 | 57,537 | 45,437
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  | 2,122 | 2,096 | 1,998
Cash received during the period for income taxes, net |  |  |  |  |  |  |  |  | $ 4,643 | $ 5,031 | $ 1,131

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