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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current [Abstract]      
Federal $ 36,358 $ 28,475 $ 15,762
State 9,768 7,653 5,977
Total Current 46,126 36,128 21,739
Deferred [Abstract]      
Federal (14,021) (1,379) 2,281
State (3,406) (338) 416
Total Deferred (17,427) (1,717) 2,697
Total income tax expense 28,699 34,411 24,436
Components of income taxes [Abstract]      
Tax benefit primarily related to changes in accounting method     5,500
Deferred tax assets [Abstract]      
Allowance for loan losses 27,282 18,535  
Lease liability 8,141 9,331  
Deferred compensation 11,602 8,336  
Postretirement benefit obligation 1,511 1,631  
Fair value adjustments from acquisitions 259 422  
Loan fees 5,400 1,384  
Accrued liabilities 1,307 1,176  
Stock-based compensation expense 3,213 3,032  
Other 3,558 1,498  
Total deferred tax assets 62,273 45,345  
Deferred tax liabilities [Abstract]      
Pension benefits 14,406 13,014  
Lease right-of-use asset 6,567 9,259  
Amortization of intangible assets 12,725 12,202  
Premises and equipment, primarily due to accelerated depreciation 4,774 5,137  
Unrealized gain on securities 7,732 1,770  
Other 952 1,429  
Total deferred tax liabilities 47,156 42,811  
Net deferred tax asset at year-end 15,117 2,534 8,795
Net deferred tax asset at beginning of year 2,534 8,795  
Increase (decrease) in net deferred tax asset 12,583 (6,261)  
Income tax reconciliation [Abstract]      
Federal income tax at statutory rate 27,948 32,641 28,770
Tax exempt income (981) (1,233) (1,456)
Net increase in cash surrender value of life insurance (1,135) (927) (973)
Federal tax credit (1,705) (1,458) (1,499)
State taxes, net of federal tax benefit 5,026 5,773 5,051
Accounting method changes - tax rate change impact 0 0 (5,326)
Stock-based compensation, excess tax benefit (152) (342) (456)
Other, net (302) (43) 325
Total income tax expense 28,699 34,411 24,436
Reconciliation of gross unrecognized tax benefits [Roll Forward]      
Beginning balance 779 641  
Additions for tax positions of prior years 254 26  
Current period tax positions 145 112  
Ending balance 1,178 779 $ 641
Amount that would affect the effective tax rate if recognized, gross of tax $ 931 $ 615  
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]      
Income Tax Examination [Abstract]      
Tax years under examination 2015 2016 2017 2018 2019