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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Taxes [Abstract] |
Schedule Of Components Of Income Tax Expense Benefit [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  |  | 2016
| (In thousands)
Current income tax expense | $ | 33,618 |  | $ | 19,101 |  | $ | 2,768
Deferred income tax expense (benefit) |  | 14,772 |  |  | (3,658) |  |  | 23,226
Total income tax expense (benefit) | $ | 48,390 |  | $ | 15,443 |  | $ | 25,994
Schedule Of Effective Income Tax Rate Reconciliation [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| Amount |  | Rate |  | Amount |  | Rate |  | Amount | Rate
| (Dollars in thousands)
Income tax expense at statutory rates | $ | 51,792 |  | 39.00% |  | $ | 26,555 |  | 39.00% |  | $ | 33,220 |  | 39.00%
Tax effect of exempt and excluded income, net |  | (6,645) |  | -5.01% |  |  | (9,506) |  | -13.96% |  |  | (11,178) |  | -13.12%
Disallowed net operating loss carryover |  | 269 |  | 0.20% |  |  | 281 |  | 0.41% |  |  | 1,406 |  | 1.65%
Change in valuation allowance |  | 1,504 |  | 1.13% |  |  | (305) |  | -0.45% |  |  | (9) |  | -0.01%
Release of unrecognized tax benefits, net |  | (386) |  | -0.29% |  |  | (775) |  | -1.14% |  |  | (135) |  | -0.16%
Capital (gain) loss at preferential rate |  | (20) |  | -0.02% |  |  | (279) |  | -0.41% |  |  | 2,394 |  | 2.81%
Effect of change in tax rate |  | 4,069 |  | 3.06% |  |  | - |  | 0.00% |  |  | - |  | 0.00%
Other items, net |  | (2,193) |  | -1.63% |  |  | (528) |  | -0.79% |  |  | 296 |  | 0.34%
Income tax expense | $ | 48,390 |  | 36.44% |  | $ | 15,443 |  | 22.66% |  | $ | 25,994 |  | 30.51%
Summary Of Income Tax Contingencies [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| In thousands)
Balance at beginning of year | $ | 1,260 |  |  | $ | 2,040 |  |  | $ | 2,175 |
Additions for tax positions of prior years |  | 81 |  |  |  | 97 |  |  |  | 229 |
Additions due to new tax positions |  | - |  |  |  | - |  |  |  | 999 |
Reduction for tax positions as a result of lapse of statute of limitations |  | (466) |  |  |  | (877) |  |  |  | (1,363) |
Balance at end of year | $ | 875 |  |  | $ | 1,260 |  |  | $ | 2,040 |
Schedule Of Deferred Tax Assets And Liabilities [Table Text Block] |
| December 31,
| 2018 |  | 2017
| (In thousands)
Deferred tax asset: |  |  |  |  |
Allowance for loan and lease losses and other reserves | $ | 85,227 |  | $ | 97,682
Loans and other real estate valuation adjustment |  | 7,842 |  |  | 10,457
Net operating loss carry forwards |  | 5,466 |  |  | 5,169
Alternative minimum tax |  | 14,631 |  |  | 15,672
Acquired portfolio |  | 35,753 |  |  | 35,293
Other assets allowances |  | 966 |  |  | 858
Other deferred tax assets |  | 5,298 |  |  | 5,304
Total gross deferred tax asset |  | 155,183 |  |  | 170,435
Less: valuation allowance |  | (4,629) |  |  | (3,135)
Net gross deferred tax assets |  | 150,554 |  |  | 167,300
Deferred tax liability: |  |  |  |  |
FDIC-assisted acquisition, net |  | (22,825) |  |  | (24,564)
Customer deposit and customer relationship intangibles |  | (1,263) |  |  | (1,828)
Building valuation ajustment |  | (8,284) |  |  | (9,069)
Servicing asset |  | (4,018) |  |  | (3,830)
Other deferred tax liabilities |  | (401) |  |  | (588)
Total gross deferred tax liabilities |  | (36,791) |  | $ | (39,879)
Net deferred tax asset | $ | 113,763 |  | $ | 127,421

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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