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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense consisted of the following components:
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018
Current expense |  |  |  |  |  |
Federal |  | $ | 34,632 |  |  | $ | 31,343 |  |  | $ | 34,330 |
State |  | 2,349 |  |  | 854 |  |  | 1,029 |
Total current expense |  | 36,981 |  |  | 32,197 |  |  | 35,359 |
Deferred expense (benefit) |  |  |  |  |  |
Federal |  | (8,624) |  |  | 10,946 |  |  | 4,675 |
State |  | 244 |  |  | 1,644 |  |  | 1,592 |
Total deferred expense (benefit) |  | (8,380) |  |  | 12,590 |  |  | 6,267 |
Income tax expense |  | $ | 28,601 |  |  | $ | 44,787 |  |  | $ | 41,626 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The difference between the federal income tax rates applied to income before income taxes and the effective rates were due to the following:
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018
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 expense (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 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The major components of the temporary differences that gave rise to deferred tax assets and liabilities at December 31, 2020, and 2019, were as follows:
(Dollars in thousands) |  | 2020 |  | 2019
Deferred tax assets |  |  |  |
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 |
OREO 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 |
Leasing liability |  | 16,947 |  |  | 14,806 |
Reserve for unfunded commitments |  | 2,854 |  |  | 133 |
Deferred loan fees and costs |  | 1,691 |  |  | 0 |
Other |  | 577 |  |  | 683 |
Total deferred tax assets |  | 77,509 |  |  | 45,503 |
Deferred tax liabilities |  |  |  |
Tax depreciation in excess of 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 obligation |  | (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) |
Net unrealized gains on investment securities |  | (20,253) |  |  | (11,359) |
Foreign exchange deferred income |  | (2,080) |  |  | (2,845) |
ASU 2016-01 unrealized gain/loss-equity securities |  | (2,179) |  |  | (128) |
Right of use assets |  | (15,053) |  |  | (13,354) |
Other |  | (2,035) |  |  | (1,920) |
Total deferred tax liabilities |  | (95,168) |  |  | (78,533) |
Total net deferred tax liability |  | $ | (17,659) |  |  | $ | (33,030) |
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | A progression of gross unrecognized tax benefits as of December 31, 2020 and 2019 is as follows:
(Dollars in thousands) |  | 2020 |  | 2019
Balance at beginning of year |  | $ | 3,006 |  |  | $ | 3,735 |
Settlements |  | (620) |  |  | (729) |
Balance at end of year |  | $ | 2,386 |  |  | $ | 3,006 |

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