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INCOME TAXES INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2018
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) |  | 2018 |  | 2017 |  | 2016
Current expense |  |  |  |  |  |
Federal |  | $ | 34,330 |  |  | $ | 22,599 |  |  | $ | 40,537 |
State |  | 1,029 |  |  | 1,265 |  |  | 1,322 |
Total current expense |  | 35,359 |  |  | 23,864 |  |  | 41,859 |
Deferred expense (benefit) |  |  |  |  |  |
Federal |  | 4,675 |  |  | (4,657 | ) |  | 528 |
State |  | 1,592 |  |  | 169 |  |  | (182 | )
Total deferred expense (benefit) |  | 6,267 |  |  | (4,488 | ) |  | 346 |
Income tax expense |  | $ | 41,626 |  |  | $ | 19,376 |  |  | $ | 42,205 |
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) |  | 2018 |  | 2017 |  | 2016
Income taxes computed at federal statutory rate on income before income taxes (21% in 2018; 35% in 2017 and 2016) |  | $ | 44,986 |  |  | $ | 40,657 |  |  | $ | 45,756 |
Benefit from tax-exempt income |  | (4,499 | ) |  | (3,427 | ) |  | (2,911 | )
Tax credits |  | (5,439 | ) |  | (16,806 | ) |  | (2,691 | )
Tax rate reduction impact |  | 0 |  |  | (8,191 | ) |  | 0 |
Basis reduction on historic tax credit |  | 0 |  |  | 4,599 |  |  | 0 |
Tax benefit of equity compensation |  | (565 | ) |  | (1,449 | ) |  | (72 | )
State income taxes, net of federal tax benefit |  | 2,070 |  |  | 932 |  |  | 741 |
Affordable housing investments |  | 4,725 |  |  | 2,798 |  |  | 1,923 |
Other |  | 348 |  |  | 263 |  |  | (541 | )
Income tax expense |  | $ | 41,626 |  |  | $ | 19,376 |  |  | $ | 42,205 |
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, 2018, and 2017, were as follows:
(Dollars in thousands) |  | 2018 |  | 2017
Deferred tax assets |  |  |  |
Allowance for loan and lease losses |  | $ | 12,782 |  |  | $ | 12,134 |
Fair value adjustments on business combinations |  | 11,199 |  |  | 369 |
Deferred compensation |  | 392 |  |  | 384 |
Postretirement benefits other than pension liability |  | 676 |  |  | 564 |
Accrued stock-based compensation |  | 1,145 |  |  | 932 |
OREO write-downs |  | 118 |  |  | 97 |
Interest on nonaccrual loans |  | 1,160 |  |  | 616 |
Accrued expenses |  | 5,808 |  |  | 3,051 |
Net unrealized losses on investment securities and derivatives |  | 3,221 |  |  | 249 |
State net operating loss |  | 3,119 |  |  | 0 |
Federal tax credit carryforwards |  | 873 |  |  | 0 |
Other |  | 425 |  |  | 339 |
Total deferred tax assets |  | 40,918 |  |  | 18,735 |
Deferred tax liabilities |  |  |  |
Tax depreciation in excess of book depreciation |  | (9,530 | ) |  | (2,510 | )
FHLB and FRB stock |  | (4,044 | ) |  | (3,384 | )
Mortgage-servicing rights |  | (2,285 | ) |  | (343 | )
Leasing activities |  | (3,881 | ) |  | (2,792 | )
Retirement obligation |  | (6,614 | ) |  | (8,888 | )
Intangible assets |  | (12,310 | ) |  | (11,559 | )
Deferred loan fees and costs |  | (131 | ) |  | (371 | )
Prepaid expenses |  | (582 | ) |  | (210 | )
Limited partnership investments |  | (2,367 | ) |  | (1,230 | )
Other |  | (1,867 | ) |  | (2,415 | )
Total deferred tax liabilities |  | (43,611 | ) |  | (33,702 | )
Total net deferred tax liability |  | $ | (2,693 | ) |  | $ | (14,967 | )
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | A progression of unrecognized tax benefits as of December 31, 2018 and 2017 is as follows:
(Dollars in thousands) |  | 2018 |  | 2017
Balance at beginning of year |  | $ | 3,735 |  |  | $ | 3,735 |
Additions for tax positions of prior years |  | 0 |  |  | 0 |
Balance at end of year |  | $ | 3,735 |  |  | $ | 3,735 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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