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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Loan interest income $ 146,200 $ 123,994
Income before income taxes 73,127 64,401
Income tax provision (15,605) (12,548)
Net Income 57,522 51,853
Compensation and employee benefits 63,079 51,736
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]    
Income before income taxes 1,402 0
Income tax provision (326) 0
Net Income 1,076 0
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 1,402 0
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) (150)
Income tax provision 30 35
Net Income (101) (115)
Compensation and employee benefits (131) (150)
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 2,575 2,576
Income tax provision (599) (599)
Net Income 1,976 1,977
Loans $ 2,575 $ 2,576