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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured on Recurring Basis at Fair Value | The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.
| Fair Value Hierarchy |  | June 30, 2018 |  | December 31, 2017
|  |  | ($ in Thousands)
Assets |  |  |  |  |
Investment securities available for sale |  |  |  |  |
U.S. Treasury securities | Level 1 |  | $ | 996 |  |  | $ | 996 |
Residential mortgage-related securities |  |  |  |  |
FNMA / FHLMC | Level 2 |  | 396,709 |  |  | 464,768 |
GNMA | Level 2 |  | 2,210,189 |  |  | 1,913,350 |
Private-label | Level 2 |  | 1,031 |  |  | 1,059 |
GNMA commercial mortgage-related securities | Level 2 |  | 1,348,282 |  |  | 1,513,277 |
FFELP asset backed securities | Level 2 |  | 299,831 |  |  | 145,176 |
Other equity securities | Level 1 |  | 1,613 |  |  | 1,632 |
Other debt securities | Level 2 |  | 3,000 |  |  | 3,188 |
Total investment securities available for sale | Level 1 |  | 2,609 |  |  | 2,628 |
Total investment securities available for sale | Level 2 |  | 4,259,042 |  |  | 4,040,818 |
Residential loans held for sale | Level 2 |  | 143,022 |  |  | 85,544 |
Interest rate-related instruments | Level 2 |  | 62,708 |  |  | 28,494 |
Foreign currency exchange forwards | Level 2 |  | 3,317 |  |  | 2,495 |
Interest rate products (designated as hedging instruments) | Level 2 |  | 2,396 |  |  | — |
Interest rate lock commitments to originate residential mortgage loans held for sale | Level 3 |  | 3,287 |  |  | 1,538 |
Commodity contracts | Level 2 |  | 66,894 |  |  | 38,686 |
Purchased options (time deposit) | Level 2 |  | 1,027 |  |  | 1,175 |
Liabilities |  |  |  |  |
Interest rate-related instruments | Level 2 |  | $ | 62,141 |  |  | $ | 28,035 |
Foreign currency exchange forwards | Level 2 |  | 3,091 |  |  | 2,339 |
Forward commitments to sell residential mortgage loans | Level 3 |  | 919 |  |  | 313 |
Commodity contracts | Level 2 |  | 66,380 |  |  | 37,286 |
Written options (time deposit) | Level 2 |  | 1,027 |  |  | 1,175 |
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) | The table below presents a rollforward of the balance sheet amounts for the six months ended June 30, 2018 and the year ended December 31, 2017, for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy.
| Investment Securities Available for Sale |  | Derivative Financial Instruments
| ($ in Thousands)
Balance December 31, 2016 | $ | 200 |  |  | $ | 3,114 |
Total net gains (losses) included in income |  |  |
Mortgage derivative gain (loss) | — |  |  | (1,889 | )
Transfer out of level 3 securities (a) | (200 | ) |  | — |
Balance December 31, 2017 | $ | — |  |  | $ | 1,225 |
Total net gains (losses) included in income |  |  |
Mortgage derivative gain (loss) | — |  |  | 1,147 |
Balance June 30, 2018 | $ | — |  |  | $ | 2,372 |
(a) During the first quarter of 2017, the $200,000 level 3 investment security was transferred to level 2 based upon new pricing information.
Assets and Liabilities Measured on Nonrecurring Basis at Fair Value | The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall.
|  | Income Statement Category of Adjustment Recognized in Income |  | Adjustment Recognized in Income
($ in Thousands) | Fair Value Hierarchy |  | Fair Value
June 30, 2018 |  |  |  |  |  |
Assets |  |  |  |
Impaired loans(a) | Level 3 |  | $ | 52,972 |  | Provision for credit losses(b) |  | $ | (12,431 | )
Other real estate owned(c) | Level 2 |  | 1,954 |  | Foreclosure / OREO expense, net |  | (808 | )
Mortgage servicing rights | Level 3 |  | 84,585 |  | Mortgage banking, net |  | 607 |
December 31, 2017 |  |  |  |  |  |
Assets |  |  |  |  |  |
Impaired loans(a) | Level 3 |  | $ | 92,534 |  | Provision for credit losses(b) |  | $ | (32,159 | )
Other real estate owned(c) | Level 2 |  | 2,604 |  | Foreclosure / OREO expense, net |  | (939 | )
Mortgage servicing rights | Level 3 |  | 64,387 |  | Mortgage banking, net |  | (175 | )
(a) | Represents individually evaluated impaired loans, net of the related allowance for loan losses.
(b) Represents provision for credit losses on individually evaluated impaired loans.
Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block] | The table below presents information about these inputs and further discussion is found above.
| Valuation Technique |  | Significant Unobservable Input |  | Weighted Average Input Applied
June 30, 2018
Mortgage servicing rights | Discounted cash flow |  | Discount rate |  | 11%
Mortgage servicing rights | Discounted cash flow |  | Constant prepayment rate |  | 9%
Impaired Loans | Appraisals / Discounted cash flow |  | Collateral / Discount factor |  | 24%
Estimated fair values of financial instruments | Fair value estimates are set forth below for the Corporation’s financial instruments.
|  |  | June 30, 2018 |  | December 31, 2017
| Fair Value Hierarchy Level |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
|  |  | ($ in Thousands)
Financial assets |  |  |  |  |  |  |  |  |
Cash and due from banks | Level 1 |  | $ | 396,761 |  |  | $ | 396,761 |  |  | $ | 483,666 |  |  | $ | 483,666 |
Interest-bearing deposits in other financial institutions | Level 1 |  | 71,462 |  |  | 71,462 |  |  | 199,702 |  |  | 199,702 |
Federal funds sold and securities purchased under agreements to resell | Level 1 |  | 3,150 |  |  | 3,150 |  |  | 32,650 |  |  | 32,650 |
Investment securities held to maturity | Level 2 |  | 2,602,247 |  |  | 2,560,943 |  |  | 2,282,853 |  |  | 2,283,574 |
Investment securities available for sale | Level 1 |  | 2,609 |  |  | 2,609 |  |  | 2,628 |  |  | 2,628 |
Investment securities available for sale | Level 2 |  | 4,259,042 |  |  | 4,259,042 |  |  | 4,040,818 |  |  | 4,040,818 |
FHLB and Federal Reserve Bank stocks | Level 2 |  | 249,040 |  |  | 249,040 |  |  | 165,331 |  |  | 165,331 |
Residential loans held for sale | Level 2 |  | 143,022 |  |  | 143,022 |  |  | 85,544 |  |  | 85,544 |
Loans, net | Level 3 |  | 22,724,184 |  |  | 22,282,282 |  |  | 20,519,111 |  |  | 20,314,984 |
Bank and corporate owned life insurance | Level 2 |  | 659,592 |  |  | 659,592 |  |  | 591,057 |  |  | 591,057 |
Derivatives (trading and other assets) | Level 2 |  | 136,342 |  |  | 136,342 |  |  | 70,850 |  |  | 70,850 |
Derivatives (trading and other assets) | Level 3 |  | 3,287 |  |  | 3,287 |  |  | 1,538 |  |  | 1,538 |
Financial liabilities |  |  |  |  |  |  |  |  |
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts | Level 3 |  | $ | 21,088,538 |  |  | $ | 21,088,538 |  |  | $ | 20,436,893 |  |  | $ | 20,436,893 |
Brokered CDs and other time deposits | Level 2 |  | 2,727,776 |  |  | 2,727,776 |  |  | 2,349,069 |  |  | 2,349,069 |
Short-term funding | Level 2 |  | 626,525 |  |  | 626,525 |  |  | 676,282 |  |  | 676,282 |
Long-term funding | Level 2 |  | 4,925,476 |  |  | 4,921,348 |  |  | 3,397,450 |  |  | 3,411,368 |
Standby letters of credit(a) | Level 2 |  | 2,549 |  |  | 2,549 |  |  | 2,402 |  |  | 2,402 |
Derivatives (trading and other liabilities) | Level 2 |  | 132,639 |  |  | 132,639 |  |  | 68,835 |  |  | 68,835 |
Derivatives (trading and other liabilities) | Level 3 |  | 919 |  |  | 919 |  |  | 313 |  |  | 313 |
(a) The commitment on standby letters of credit was $256 million and $235 million at June 30, 2018 and December 31, 2017, respectively. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of all information related to the key inputs and assumptions (including, at a minimum, but not limited to, and if applicable, quantitative information about discount rates, expected prepayments including the expected weighted-average life of prepayable financial assets, and anticipated credit losses) used in measuring the fair value of assets or liabilities that relate to the transferor's continuing involvement with transferred financial assets, as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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