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Condensed Financial Statements of Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 186,483	$ 178,871	$ 87,554
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,121	35,696	28,704
Share-based compensation	8,839	8,783	6,934
Gain on sale of securities available for sale	(2,711)	655	(1,421)
Decrease (increase) in other assets	(44,767)	(1,168)	(32,324)
Decrease in other liabilities	36,023	3,359	7,076
Net cash provided by operating activities	181,028	283,711	197,890
Cash flows from investing activities:
Net cash inflow from acquisitions			185,163
Net cash used in investing activities	(795,053)	(282,149)	(60,900)
Cash flows from financing activities:
Repayment of other borrowings	(150,007)	(540,007)	(390,811)
Common stock issuance	1,394	1,331	1,055
Common stock repurchased	(159,431)	(70,577)	(5,512)
Dividends paid on common stock	(57,696)	(50,557)	(38,623)
Stock options exercised	1,230	1,032	1,965
Net cash provided by (used in) financing activities	893,746	29,794	(133,811)
Net increase in cash and cash equivalents	279,721	31,356	3,179
Cash and cash equivalents at beginning of period	408,983	377,627	374,448
Cash and cash equivalents at end of period	688,704	408,983	377,627
Parent company | Reportable Legal Entities
Cash flows from operating activities:
Net income	186,483	178,871	87,554
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	666	666	666
Share-based compensation	8,839	8,783	6,934
Gain on sale of securities available for sale	(5,366)		(486)
Decrease (increase) in other assets	(159)	1,465	(1,564)
Decrease in other liabilities	(959)	(2,048)	(6,341)
Undistributed earnings of subsidiary	20,229	(73,753)	(33,700)
Net cash provided by operating activities	209,733	113,984	53,063
Cash flows from investing activities:
Proceeds from sales and calls of other investment securities	5,366		687
Net cash inflow from acquisitions			15,468
Net cash used in investing activities	5,366		16,155
Cash flows from financing activities:
Repayment of other borrowings			(30,000)
Common stock issuance	1,394	1,331	1,056
Common stock repurchased	(159,431)	(70,577)	(5,512)
Dividends paid on common stock	(57,696)	(50,557)	(38,623)
Stock options exercised	1,230	1,032	1,965
Net cash provided by (used in) financing activities	(214,503)	(118,771)	(71,114)
Net increase in cash and cash equivalents	596	(4,787)	(1,896)
Cash and cash equivalents at beginning of period	21,092	25,879	27,775
Cash and cash equivalents at end of period	$ 21,688	$ 21,092	$ 25,879

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