Parent Company Financial Statements (Condensed Statements of Income and Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
EXPENSES
Salaries and Employee Benefits	$ 83,244	$ 84,145	$ 68,570
Professional Fees	5,575	6,295	5,009
Interest Expense	66,223	18,342	9,549
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES	103,647	99,176	102,785
Income Tax Benefit	(17,759)	(17,351)	(18,648)
NET INCOME	85,888	81,825	84,137
Other Comprehensive Income (Loss):
Changes in Unrecognized Loss in Postretirement Benefit Obligation, Net	0	54	0
Parent Company
INCOME
Interest Income	277	104	109
Other Income (Loss)	(28)	31	11
Total Income	50,249	35,135	66,590
EXPENSES
Salaries and Employee Benefits	535	535	537
Professional Fees	777	1,989	1,256
Occupancy and Equipment Expense	8	8	10
Interest Expense	5,360	3,963	2,763
Other Expenses	1,183	1,162	1,200
Total Expenses	7,863	7,657	5,766
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES	42,386	27,478	60,824
Income Tax Benefit	2,215	1,947	1,607
INCOME BEFORE EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES	44,601	29,425	62,431
Equity in Undistributed Income of Subsidiaries	41,287	52,400	21,706
NET INCOME	85,888	81,825	84,137
Other Comprehensive Income (Loss):
Changes in Unrealized Gain (Loss) on Securities, Available-for-Sale	46,378	(278,976)	(19,891)
Changes in Unrecognized Loss in Postretirement Benefit Obligation, Net	0	54	0
TOTAL COMPREHENSIVE INCOME (LOSS)	132,266	(197,097)	64,246
Parent Company | Bank
INCOME
Dividends from Subsidiaries	50,000	35,000	65,000
Parent Company | Non-bank
INCOME
Dividends from Subsidiaries	$ 0	$ 0	$ 1,470