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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 126,899 $ 21,834 $ 48,389
Increase (reduction) of taxes resulting from:      
State income taxes, net of federal tax benefit 18,372 3,077 4,080
Non- deductible merger expenses   1,344  
Increase in cash surrender value of BOLI policies (3,866) (2,389) (1,210)
Tax-exempt interest (5,450) (2,257) (1,877)
Income tax credits (11,759) (7,138) (6,881)
Non-deductible FDIC premiums 2,380 1,364 133
Non-deductible executive compensation 530 1,016 315
Benefit of tax loss carryback under CARES Act   (31,468)  
Other, net 1,630 (2,043) 993
(Benefit) provision for income taxes 128,736 (16,660) $ 43,942
Components of the net deferred tax asset      
Allowance for loan losses 81,767 119,602  
Other-than-temporary impairment on SBIC investments   268  
Share-based compensation 6,290 2,807  
Pension plan and post-retirement benefits 752 516  
Deferred compensation 14,437 13,671  
Purchase accounting adjustments   11,772  
Other real estate owned 1,577 899  
Net operating loss and tax credit carryforwards 20,659 26,229  
Deferred loan fees and costs   12,826  
Nonaccrual Interest 88 3,141  
Lease liability 28,514 28,179  
Mark to market assets 11,788    
Unrealized losses on investment securities available for sale 6,691    
Other 719 603  
Total deferred tax assets 173,282 220,513  
Unrealized gains on investment securities available for sale   13,026  
Depreciation 21,028 18,326  
Intangible assets 27,732 34,648  
Net deferred loan costs 3,579    
Right of use assets 27,136 27,012  
Prepaid expense 725 1,950  
Tax deductible goodwill 5,994 1,302  
Mortgage servicing rights 16,100 6,134  
Purchase accounting adjustments 890    
Other 302 1,534  
Total deferred tax liabilities 103,486 103,932  
Net deferred tax assets before valuation allowance 69,796 116,581  
Less, valuation allowance (4,832) (5,635)  
Net deferred tax assets $ 64,964 $ 110,946