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INCOME TAXES (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current expense [Abstract]      
Federal $ 34,632 $ 31,343 $ 34,330
State 2,349 854 1,029
Total current expense 36,981 32,197 35,359
Deferred (benefit) expense [Abstract]      
Federal (8,624) 10,946 4,675
State 244 1,644 1,592
Total deferred (benefit) expense (8,380) 12,590 6,267
Income tax expense 28,601 44,787 41,626
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income taxes computed at federal statutory rate (21%) on income before income taxes 38,726 51,001 44,986
Benefit from tax-exempt income (5,901) (5,964) (4,499)
Tax credits (13,064) (10,075) (5,439)
Basis reduction on tax credit 657 738 0
Tax benefit of equity compensation 340 (140) (565)
State income taxes, net of federal tax benefit 2,049 1,973 2,070
Affordable housing investments 6,635 5,825 4,725
Other (841) 1,429 348
Income tax expense 28,601 44,787 41,626
Deferred tax assets [Abstract]      
Allowance for credit losses 39,671 13,011  
Fair value adjustments on business combinations 3,870 6,470  
Deferred compensation 235 228  
Postretirement benefits other than pension liability 684 666  
Accrued stock-based compensation 1,654 1,296  
Other real estate owned write-downs 8 162  
Interest on nonaccrual loans 1,712 548  
Accrued expenses 5,647 4,708  
State net operating loss 1,959 2,792  
Deferred tax asset, Leasing liability 16,947 14,806  
Federal tax credit carryforwards 2,854 133  
Deferred Tax Assets, Deferred Income 1,691 0  
Other 577 683  
Total deferred tax assets 77,509 45,503  
Deferred tax liabilities [Abstract]      
Tax depreciation greater than book depreciation (11,923) (10,970)  
FHLB and FRB stock (4,043) (4,043)  
Mortgage-servicing rights (2,925) (2,435)  
Leasing activities (6,661) (7,349)  
Retirement obligations 10,984 8,511  
Intangible assets (13,942) (11,647)  
Deferred loan fees and costs 0 (1,100)  
Prepaid expenses (619) (623)  
Limited partnership investments 2,471 2,249  
Unrealized gains on investment securities (20,253) (11,359)  
Foreign exchange deferred income (2,080) (2,845)  
Deferred Tax Liability, Unrealized gain/loss equity securities (2,179) (128)  
Deferred tax liability, right of use asset (15,053) (13,354)  
Other (2,035) (1,920)  
Deferred Tax Liabilities, Gross (95,168) (78,533)  
Total deferred tax liabilities (17,659) (33,030)  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Balance at beginning of year 3,006 3,735  
Decrease resulting from settlements (620) (729)  
Balance at end of year $ 2,386 $ 3,006 $ 3,735
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Deferred Tax Assets Operating Loss Carryforwards State And Local Acquired $ 2,500 $ 3,600  
Deferred taxes, business combination, valuation allowance 0 0  
Retained Earnings For Which No Deferred Income Tax Liability Has Been Recognized 16,100 16,100  
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender 3,400    
Unrecognized tax benefits affecting income tax rate 1,900 2,400  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 0 $ 0