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Condensed Parent Company Information (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	$ 92,046	$ 89,289	$ 45,972
(Increase) decrease in other assets	(5,735)	3,525	6,724
Increase (decrease) in other liabilities	1,197	(6,629)	(10,729)
Net cash provided by operating activities	51,238	46,410	26,838
Cash Flows From Investing Activities
Net cash used by investing activities	(424,686)	(313,279)	(128,532)
Cash Flows From Financing Activities
Repurchases of common stock	(10,000)	0	0
Stock withheld for payment of taxes	(702)	(406)	(231)
Net cash provided by financing activities	141,852	240,277	285,191
(Decrease) increase in Cash and Cash Equivalents	(231,596)	(26,592)	183,497
Cash and Cash Equivalents, Beginning of Year	462,898	489,490	305,993
Cash and Cash Equivalents, End of Year	231,302	462,898	489,490
Parent Company
Cash Flows From Operating Activities
Net income	92,046	89,289	45,972
(Equity in undistributed earnings of subsidiaries) Excess of dividends over earnings of subsidiaries	(65,555)	(77,050)	4,793
(Increase) decrease in other assets	(5,850)	(13)	283
Increase (decrease) in other liabilities	64	146	(67)
Net cash provided by operating activities	20,705	12,372	50,981
Cash Flows From Investing Activities
Downstream cash investment to subsidiary	0	0	(9,000)
Note receivable proceeds received	0	0	3,054
Proceeds from sales of investments	0	0	174
Net cash paid in acquisitions	0	0	(37,664)
Net cash used by investing activities	0	0	(43,436)
Cash Flows From Financing Activities
Payment of common stock cash dividends	(13,662)	(11,281)	(7,596)
Repurchases of common stock	(10,000)	0	0
Proceeds from issuance of common stock	129	324	287
Stock withheld for payment of taxes	(702)	(406)	(231)
Net cash provided by financing activities	(24,235)	(11,363)	(7,540)
(Decrease) increase in Cash and Cash Equivalents	(3,530)	1,009	5
Cash and Cash Equivalents, Beginning of Year	5,544	4,535	4,530
Cash and Cash Equivalents, End of Year	$ 2,014	$ 5,544	$ 4,535

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