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Parent Company Financial Information- Cash flow (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Cash Provided By Used In Operating Activities Abstract
Net Income	$ 35,456	$ 36,495	$ 37,243	$ 33,749	$ 40,317	$ 38,948	$ 37,296	$ 35,715	$ 15,569	$ 29,874	$ 27,772	$ 27,017	$ 142,943	$ 152,276	$ 100,232
Adjustments to reconcile net income to net cash provided by operating activities:
Net tax benefits from stock compensation													(48)	110	460
Securities premium amortization (discount accretion), net													5,186	4,445	3,986
Increase in other assets													(21,340)	(16,301)	(19,324)
(Decrease) increase in other liabilities													19,809	2,061	10,348
Net cash provided by operating activities													132,684	165,455	160,924
Cash Flows From Investing Activities:
Net cash provided by (used in) investing activities													(637,127)	(784,801)	(810,377)
Cash Flows From Financing Activities:
Common stock repurchased													(54,903)
Net cash provided by financing activities													424,552	750,737	471,763
Net (Decrease) Increase in Cash													(79,891)	131,391	(177,690)
Cash and Cash Equivalents at Beginning of Period				321,864				190,473				368,163	321,864	190,473	368,163
Cash and Cash Equivalents at End of Period	241,973				321,864				190,473				241,973	321,864	190,473
Parent Company [Member]
Net Cash Provided By Used In Operating Activities Abstract
Net Income													142,943	152,276	100,232
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income of subsidiary													(70,396)	(163,393)	(108,941)
Net tax benefits from stock compensation													10	110	460
Securities premium amortization (discount accretion), net													2
Increase in other assets													(21,447)	(2,508)	(988)
(Decrease) increase in other liabilities													2,460	(61)	(189)
Net cash provided by operating activities													53,572	(13,576)	(9,426)
Cash Flows From Investing Activities:
Purchases of available for sale investment securities													(7,030)
Investment in subsidiary (net)														6,892	(460)
Net cash provided by (used in) investing activities													(7,030)	6,892	(460)
Cash Flows From Financing Activities:
Common stock repurchased													(54,903)
Net cash provided by financing activities													(76,121)	1,584	1,208
Net (Decrease) Increase in Cash													(29,579)	(5,100)	(8,678)
Cash and Cash Equivalents at Beginning of Period				$ 72,783				$ 77,883				$ 86,561	72,783	77,883	86,561
Cash and Cash Equivalents at End of Period	$ 43,204				$ 72,783				$ 77,883				$ 43,204	$ 72,783	$ 77,883

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