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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loan interest income $ 147,451 $ 125,462 $ 293,651 $ 249,456
Income before income taxes 74,978 69,576 148,105 133,977
Income tax provision (16,170) (14,537) (31,775) (27,085)
Net Income 58,808 55,039 116,330 106,892
Compensation and employee benefits 57,386 53,450 120,465 105,186
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 0 314 0 314
Income before income taxes 2,710 764 4,112 764
Income tax provision (630) (178) (956) (178)
Net Income 2,080 586 3,156 586
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of unrealized gains and losses related to available for sale securities transfer        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loan interest income 2,710 450 4,112 450
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes (131) (149) (262) (299)
Income tax provision 31 34 61 69
Net Income (100) (115) (201) (230)
Compensation and employee benefits (131) (149) (262) (299)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains and losses from hedging instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes 2,603 2,602 5,178 5,178
Income tax provision (605) (604) (1,204) (1,203)
Net Income 1,998 1,998 3,974 3,975
Loans $ 2,603 $ 2,602 $ 5,178 $ 5,178