Parent Company Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net Income	$ 110,343	$ 21,040	$ 98,234
Net Cash Provided by Operating Activities	216,111	53,451	138,423
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities	11,980	(161,101)	(210,556)
FINANCING ACTIVITIES
Repayment of long term debt	(11,001)	(27,187)	(35,936)
Sale of treasury shares, net	(630)	(594)	(915)
Purchase of treasury shares	0	(12,559)	(18,222)
Cash dividends paid to common shareholders	(44,325)	(43,949)	(37,360)
Net Cash Provided by Financing Activities	464,458	139,493	114,467
Net increase in cash and cash equivalents	692,549	31,843	42,334
Cash and cash equivalents at beginning of year	229,666	197,823	155,489
Cash and Cash Equivalents at End of Year	922,215	229,666	197,823
Parent Company
OPERATING ACTIVITIES
Net Income	110,343	21,040	98,234
Equity in undistributed (earnings) losses of subsidiaries	(52,217)	33,430	(43,164)
Other	761	1,708	(99)
Net Cash Provided by Operating Activities	58,887	56,178	54,971
INVESTING ACTIVITIES
Net investments in subsidiaries	0	0	176
Acquisitions	0	0	(10)
Net Cash Provided by (Used in) Investing Activities	0	0	166
FINANCING ACTIVITIES
Repayment of long term debt	(9,750)	0	0
Sale of treasury shares, net	(629)	(594)	(915)
Purchase of treasury shares	0	(12,559)	(18,222)
Cash dividends paid to common shareholders	(44,324)	(43,949)	(37,360)
Payment to repurchase of warrant	0	0	0
Net Cash Provided by Financing Activities	(54,703)	(57,102)	(56,497)
Net increase in cash and cash equivalents	4,184	(924)	(1,360)
Cash and cash equivalents at beginning of year	6,585	7,509	8,869
Cash and Cash Equivalents at End of Year	$ 10,769	$ 6,585	$ 7,509