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Estimated Fair Values (Tables) | 6 Months Ended
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Jun. 30, 2016
Fair Value Disclosures [Abstract] |
Estimated Fair Values For Certain Financial Assets And Financial Liabilities | For all other financial assets and financial liabilities, the carrying value is a reasonable estimate of the fair value as of June 30, 2016 and December 31, 2015. The carrying value and fair value for these assets and liabilities are equivalent because they are relatively short term in nature and there is no interest rate or credit risk that would cause the fair value to differ from the carrying value. Cash and due from banks is classified on the fair value hierarchy as level 1. Overnight investments, income earned not collected, short-term borrowings and accrued interest payable are considered level 2. Lastly, the receivable from the FDIC for loss share agreements is designated as level 3.
(Dollars in thousands) | June 30, 2016 |  | December 31, 2015
Carrying value |  | Fair value |  | Carrying value |  | Fair value
Cash and due from banks | $ | 507,569 |  |  | $ | 507,569 |  |  | $ | 534,086 |  |  | $ | 534,086 |
Overnight investments | 2,276,080 |  |  | 2,276,080 |  |  | 2,063,132 |  |  | 2,063,132 |
Investment securities available for sale | 6,557,580 |  |  | 6,557,580 |  |  | 6,861,293 |  |  | 6,861,293 |
Investment securities held to maturity | 156 |  |  | 165 |  |  | 255 |  |  | 265 |
Loans held for sale | 84,795 |  |  | 84,795 |  |  | 59,766 |  |  | 59,766 |
Net loans and leases | 20,534,563 |  |  | 20,089,558 |  |  | 20,033,774 |  |  | 19,353,325 |
Receivable from the FDIC for loss share agreements | 5,281 |  |  | 5,281 |  |  | 4,054 |  |  | 4,054 |
Income earned not collected | 71,916 |  |  | 71,916 |  |  | 70,036 |  |  | 70,036 |
Federal Home Loan Bank stock | 43,495 |  |  | 43,495 |  |  | 37,511 |  |  | 37,511 |
Mortgage servicing rights | 16,824 |  |  | 16,884 |  |  | 19,351 |  |  | 19,495 |
Deposits | 27,257,774 |  |  | 26,819,080 |  |  | 26,930,755 |  |  | 26,164,472 |
Short-term borrowings | 728,562 |  |  | 728,562 |  |  | 594,733 |  |  | 594,733 |
Long-term obligations | 850,504 |  |  | 888,551 |  |  | 704,155 |  |  | 718,102 |
Payable to the FDIC for loss share agreements | 94,252 |  |  | 100,339 |  |  | 126,453 |  |  | 131,894 |
Accrued interest payable | 6,337 |  |  | 6,337 |  |  | 5,713 |  |  | 5,713 |
Interest rate swap (1) | — |  |  | — |  |  | 1,429 |  |  | 1,429 |
Assets And Liabilities Carried At Fair Value On A Recurring Basis | For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of June 30, 2016 and December 31, 2015.
| June 30, 2016
|  |  | Fair value measurements using:
(Dollars in thousands) | Fair value |  | Level 1 inputs |  | Level 2 inputs |  | Level 3 inputs
Assets measured at fair value |  |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,541,479 |  |  | $ | — |  |  | $ | 1,541,479 |  |  | $ | — |
Government agency | 355,545 |  |  | — |  |  | 355,545 |  |  | — |
Mortgage-backed securities | 4,535,831 |  |  | — |  |  | 4,535,831 |  |  | — |
Equity securities | 81,390 |  |  | 23,197 |  |  | 58,193 |  |  | — |
Corporate bonds | 41,385 |  |  | — |  |  | 41,385 |  |  | — |
Other | 1,950 |  |  | — |  |  | 1,950 |  |  | — |
Total investment securities available for sale | $ | 6,557,580 |  |  | $ | 23,197 |  |  | $ | 6,534,383 |  |  | $ | — |
Loans held for sale | $ | 84,795 |  |  | $ | — |  |  | $ | 84,795 |  |  | $ | — |
| December 31, 2015
|  |  | Fair value measurements using:
| Fair value |  | Level 1 inputs |  | Level 2 inputs |  | Level 3 inputs
Assets measured at fair value |  |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,674,882 |  |  | $ | — |  |  | $ | 1,674,882 |  |  | $ | — |
Government agency | 498,660 |  |  | — |  |  | 498,660 |  |  | — |
Mortgage-backed securities | 4,668,198 |  |  | — |  |  | 4,668,198 |  |  | — |
Equity securities | 8,893 |  |  | 1,668 |  |  | 7,225 |  |  | — |
Corporate bonds | 8,500 |  |  | — |  |  | 8,500 |  |  | — |
Other | 2,160 |  |  | — |  |  | 2,160 |  |  | — |
Total investment securities available for sale | $ | 6,861,293 |  |  | $ | 1,668 |  |  | $ | 6,859,625 |  |  | $ | — |
Loans held for sale | $ | 59,766 |  |  | $ | — |  |  | $ | 59,766 |  |  | $ | — |
Liabilities measured at fair value |  |  |  |  |  |  |
Interest rate swaps accounted for as cash flow hedges | $ | 1,429 |  |  | $ | — |  |  | $ | 1,429 |  |  | $ | — |
Fair Value Option | The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for residential real estate loans held for sale measured at fair value as of June 30, 2016 and December 31, 2015.
| June 30, 2016
(Dollars in thousands) | Fair Value |  | Aggregate Unpaid Principal Balance |  | Difference
Loans held for sale | $ | 84,795 |  |  | $ | 82,280 |  |  | $ | 2,515 |
| December 31, 2015
| Fair Value |  | Aggregate Unpaid Principal Balance |  | Difference
Loans held for sale | $ | 59,766 |  |  | $ | 58,890 |  |  | $ | 876 |
No loans held for sale were 90 or more days past due or on nonaccrual status as of June 30, 2016 or December 31, 2015. The changes in fair value for residential real estate loans held for sale for which we elected the fair value option are included in the table below for the three and six months ended June 30, 2016 and 2015.
| Three months ended June 30 |  | Six months ended June 30
(Dollars in thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Gains (losses) from fair value changes on loans held for sale | $ | 876 |  |  | $ | (461 | ) |  | $ | 1,639 |  |  | $ | (31 | )
Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis | For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of June 30, 2016 and December 31, 2015.
| June 30, 2016
|  |  | Fair value measurements using:
(Dollars in thousands) | Fair value |  | Level 1 inputs |  | Level 2 inputs |  | Level 3 inputs
Impaired loans | $ | 60,459 |  |  | $ | — |  |  | $ | — |  |  | $ | 60,459 |
Other real estate not covered under loss share agreements remeasured during current year | 37,635 |  |  | — |  |  | — |  |  | 37,635 |
Other real estate covered under loss share agreements remeasured during current year | 295 |  |  | — |  |  | — |  |  | 295 |
Mortgage servicing rights | 16,473 |  |  | — |  |  | — |  |  | 16,473 |
| December 31, 2015
|  |  | Fair value measurements using:
| Fair value |  | Level 1 inputs |  | Level 2 inputs |  | Level 3 inputs
Impaired loans | $ | 64,197 |  |  | $ | — |  |  | $ | — |  |  | $ | 64,197 |
Other real estate not covered under loss share agreements remeasured during current year | 44,571 |  |  | — |  |  | — |  |  | 44,571 |
Other real estate covered under loss share agreements remeasured during current year | 4,403 |  |  | — |  |  | — |  |  | 4,403 |
Mortgage servicing rights | 17,997 |  |  | — |  |  | — |  |  | 17,997 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14217-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (c)(2),(d),(e) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a),(c)(1),(d)(1) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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