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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Difference between the provision for income taxes and taxes computed by applying the federal statutory income tax rate to income before provision for income taxes      
Income taxes at federal statutory rate $ 21,834 $ 48,389 $ 47,094
Increase (reduction) of taxes resulting from:      
State income taxes, net of federal tax benefit 3,077 4,080 5,916
Non- deductible merger expenses 1,344    
Increase in cash surrender value of BOLI policies (2,389) (1,210) (1,261)
Tax-exempt interest (2,257) (1,877) (2,037)
Income tax credits (7,138) (6,881) (3,118)
Non-deductible FDIC premiums 1,364 133 191
Non-deductible executive compensation 1,016 315 305
Revaluation of net deferred tax asset due to tax law change     (991)
Benefit of tax loss carryback under CARES Act (31,468)    
Other, net (2,043) 993 (715)
(Benefit) provision for income taxes (16,660) 43,942 $ 45,384
Components of the net deferred tax asset      
Allowance for loan losses 119,602 14,468  
Other-than-temporary impairment on securities 268 250  
Share-based compensation 2,807 4,975  
Pension plan and post-retirement benefits 516 494  
Deferred compensation 13,671 12,475  
Purchase accounting adjustments 11,772 24,530  
Other real estate owned 899 380  
Net operating loss and tax credit carryforwards 26,229 10,347  
Deferred loan fees and costs 12,826    
Nonaccrual Interest 3,141    
Lease liability 28,179 19,146  
Cash flow hedge   3,034  
Other 603 1,040  
Total deferred tax assets 220,513 91,139  
Unrealized gains on investment securities available for sale 13,026 2,373  
Depreciation 18,326 6,585  
Intangible assets 34,648 9,979  
Net deferred loan costs   9,082  
Right of use assets 27,012 19,465  
Prepaid expense 1,950 474  
Tax deductible goodwill 1,302 810  
Mortgage servicing rights 6,134 6,688  
Other 1,534 480  
Total deferred tax liabilities 103,932 55,936  
Net deferred tax assets before valuation allowance 116,581 35,203  
Less, valuation allowance (5,635) (3,887)  
Net deferred tax assets $ 110,946 $ 31,316