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PARENT COMPANY STATEMENTS, Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expenses [Abstract]      
Interest on borrowings $ 3,904 $ 2,949 $ 2,537
Acquisition expenses 25,986 1,706 7,037
Other expenses 18,540 16,553 13,521
Income before tax benefit and equity in undistributed net income of subsidiaries 159,965 154,597 132,217
Income tax benefit/(expense) (9,248) (50,785) (40,987)
Net income 150,717 103,812 91,230
Other comprehensive (loss), net of tax [Abstract]      
Changes in other comprehensive income/(loss) related to pension and other post retirement obligations 168 3,322 (4,567)
Changes in other comprehensive loss related to unrealized losses on available-for-sale securities (11,065) (14,714) (6,918)
Other comprehensive (loss), net of tax (10,897) (11,392) (11,485)
Comprehensive income 139,820 92,420 79,745
Parent Company [Member]      
Dividends from subsidiaries [Abstract]      
Bank subsidiary 91,000 89,000 70,000
Non-bank subsidiaries 35,500 1,750 6,000
Interest and dividends on investments 133 102 94
Total revenues 126,633 90,852 76,094
Expenses [Abstract]      
Interest on borrowings 3,904 2,949 2,537
Acquisition expenses 91 429 0
Other expenses 26 11 19
Total expenses 4,021 3,389 2,556
Income before tax benefit and equity in undistributed net income of subsidiaries 122,612 87,463 73,538
Income tax benefit/(expense) 1,930 866 (572)
Income before equity in undistributed net income of subsidiaries 124,542 88,329 72,966
Equity in undistributed net income of subsidiaries 26,175 15,483 18,264
Net income 150,717 103,812 91,230
Other comprehensive (loss), net of tax [Abstract]      
Changes in other comprehensive income/(loss) related to pension and other post retirement obligations 168 3,322 (4,567)
Changes in other comprehensive loss related to unrealized losses on available-for-sale securities (11,065) (14,714) (6,918)
Other comprehensive (loss), net of tax (10,897) (11,392) (11,485)
Comprehensive income $ 139,820 $ 92,420 $ 79,745