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INCOME TAXES (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Current expense [Abstract] |  |  |
Federal | $ 21,397 | $ 34,632 | $ 31,343
State | 2,289 | 2,349 | 854
Total current expense | 23,686 | 36,981 | 32,197
Deferred (benefit) expense [Abstract] |  |  |
Federal | 10,944 | (8,624) | 10,946
State | 1,143 | 244 | 1,644
Total deferred (benefit) expense | 12,087 | (8,380) | 12,590
Income tax expense | 35,773 | 28,601 | 44,787
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income taxes computed at federal statutory rate (21%) on income before income taxes | 50,596 | 38,726 | 51,001
Benefit from tax-exempt income | (5,613) | (5,901) | (5,964)
Tax credits | (21,561) | (13,064) | (10,075)
Basis reduction on tax credit | 1,346 | 657 | 738
Tax benefit of equity compensation | (243) | 340 | (140)
State income taxes, net of federal tax benefit | 2,711 | 2,049 | 1,973
Affordable housing investments | 7,194 | 6,635 | 5,825
Other | 1,343 | (841) | 1,429
Income tax expense | 35,773 | 28,601 | 44,787
Deferred tax assets [Abstract] |  |  |
Allowance for credit losses | 29,754 | 39,671 |
Fair value adjustments on business combinations | 0 | 3,870 |
Deferred compensation | 292 | 235 |
Postretirement benefits other than pension liability | 652 | 684 |
Accrued stock-based compensation | 1,836 | 1,654 |
Other real estate owned write-downs | 0 | 8 |
Interest on nonaccrual loans | 442 | 1,712 |
Accrued expenses | 7,286 | 5,647 |
State net operating loss | 1,746 | 1,959 |
Deferred tax asset, Leasing liability | 15,794 | 16,947 |
Federal tax credit carryforwards | 3,049 | 2,854 |
Deferred Tax Assets, Deferred Income | 0 | 1,691 |
Other | 565 | 577 |
Total deferred tax assets | 61,416 | 77,509 |
Deferred tax liabilities [Abstract] |  |  |
Tax depreciation greater than book depreciation | (9,117) | (11,923) |
FHLB and FRB stock | (3,836) | (4,043) |
Mortgage-servicing rights | (3,518) | (2,925) |
Leasing activities | (10,860) | (6,661) |
Retirement obligations | 13,754 | 10,984 |
Intangible assets | (16,081) | (13,942) |
Deferred loan fees and costs | (933) | 0 |
Prepaid expenses | (680) | (619) |
Limited partnership investments | 2,957 | 2,471 |
Unrealized gains on investment securities | (5,791) | (20,253) |
Foreign exchange deferred income | (428) | (2,080) |
Deferred Tax Liability, Unrealized gain/loss equity securities | (2,339) | (2,179) |
Deferred tax liability, right of use asset | (13,390) | (15,053) |
Other | (2,426) | (2,035) |
Deferred Tax Liabilities, Gross | (93,010) | (95,168) |
Total deferred tax liabilities | (31,594) | (17,659) |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |
Balance at beginning of year | 2,386 | 3,006 |
Decrease resulting from settlements | 0 | (620) |
Balance at end of year | $ 2,386 | $ 2,386 | $ 3,006
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 | $ 2,300 | $ 2,500 |
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 | 1,900 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 | 0 |
Fair value adjustments on business combinations | $ 6,900 | $ 0 |

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