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Disclosures about Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Estimated Fair Values of Financial Instruments | The estimated fair values of Customers’ financial instruments were as follows at December 31, 2017 and 2016.
| Carrying Amount |  | Estimated Fair Value |  | Fair Value Measurements at December 31, 2017
Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
(amounts in thousands) |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 146,323 |  |  | $ | 146,323 |  |  | $ | 146,323 |  |  | $ | — |  |  | $ | — |
Investment securities, available for sale | 471,371 |  |  | 471,371 |  |  | 3,352 |  |  | 468,019 |  |  | — |
Loans held for sale | 1,939,485 |  |  | 1,939,659 |  |  | — |  |  | 1,795,294 |  |  | 144,365 |
Loans receivable, net of allowance for loan losses | 6,730,243 |  |  | 6,676,763 |  |  | — |  |  | — |  |  | 6,676,763 |
FHLB, Federal Reserve Bank and other restricted stock | 105,918 |  |  | 105,918 |  |  | — |  |  | 105,918 |  |  | — |
Derivatives | 9,752 |  |  | 9,752 |  |  | — |  |  | 9,692 |  |  | 60 |
Liabilities |  |  |  |  |  |  |  |  |
Deposits | $ | 6,800,142 |  |  | $ | 6,796,095 |  |  | $ | 4,894,449 |  |  | $ | 1,901,646 |  |  | $ | — |
Federal funds purchased | 155,000 |  |  | 155,000 |  |  | 155,000 |  |  | — |  |  | — |
FHLB advances | 1,611,860 |  |  | 1,611,603 |  |  | 881,860 |  |  | 729,743 |  |  | — |
Other borrowings | 186,497 |  |  | 193,557 |  |  | 65,072 |  |  | 128,485 |  |  | — |
Subordinated debt | 108,880 |  |  | 115,775 |  |  | — |  |  | 115,775 |  |  | — |
Derivatives | 10,074 |  |  | 10,074 |  |  | — |  |  | 10,074 |  |  | — |
| Carrying Amount |  | Estimated Fair Value |  | Fair Value Measurements at December 31, 2016
Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
(amounts in thousands) |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 264,709 |  |  | $ | 264,709 |  |  | $ | 264,709 |  |  | $ | — |  |  | $ | — |
Investment securities, available for sale | 493,474 |  |  | 493,474 |  |  | 15,246 |  |  | 478,228 |  |  | — |
Loans held for sale | 2,117,510 |  |  | 2,117,510 |  |  | — |  |  | 2,117,510 |  |  | — |
Loans receivable, net of allowance for loan losses | 6,117,322 |  |  | 6,162,020 |  |  | — |  |  | — |  |  | 6,162,020 |
FHLB and Federal Reserve Bank, and other restricted stock | 68,408 |  |  | 68,408 |  |  | — |  |  | 68,408 |  |  | — |
Derivatives | 10,864 |  |  | 10,864 |  |  | — |  |  | 10,819 |  |  | 45 |
Liabilities |  |  |  |  |  |  |  |  |
Deposits | $ | 7,303,775 |  |  | $ | 7,303,663 |  |  | $ | 4,472,013 |  |  | $ | 2,831,650 |  |  | $ | — |
Federal funds purchased | 83,000 |  |  | 83,000 |  |  | 83,000 |  |  | — |  |  | — |
FHLB advances | 868,800 |  |  | 869,049 |  |  | 688,800 |  |  | 180,249 |  |  | — |
Other borrowings | 87,123 |  |  | 91,761 |  |  | 66,261 |  |  | 25,500 |  |  | — |
Subordinated debt | 108,783 |  |  | 111,375 |  |  | — |  |  | 111,375 |  |  | — |
Derivatives | 14,172 |  |  | 14,172 |  |  | — |  |  | 14,172 |  |  | — |
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Non-recurring Basis | For financial assets and liabilities measured at fair value on a recurring and non-recurring basis, the fair value measurements by level within the fair value hierarchy used at December 31, 2017 and 2016, were as follows:
| December 31, 2017
| Fair Value Measurements at the End of the Reporting Period Using
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
(amounts in thousands) |
Measured at Fair Value on a Recurring Basis |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | — |  |  | $ | 183,458 |  |  | $ | — |  |  | $ | 183,458 |
Agency-guaranteed commercial mortgage-backed securities | — |  |  | 238,472 |  |  | — |  |  | 238,472 |
Corporate notes | — |  |  | 46,089 |  |  | — |  |  | 46,089 |
Equity securities | 3,352 |  |  | — |  |  | — |  |  | 3,352 |
Derivatives | — |  |  | 9,692 |  |  | 60 |  |  | 9,752 |
Loans held for sale – fair value option | — |  |  | 1,795,294 |  |  | — |  |  | 1,795,294 |
Total assets - recurring fair value measurements | $ | 3,352 |  |  | $ | 2,273,005 |  |  | $ | 60 |  |  | $ | 2,276,417 |
Liabilities |  |  |  |  |  |  |
Derivatives | $ | — |  |  | $ | 10,074 |  |  | $ | — |  |  | $ | 10,074 |
Measured at Fair Value on a Nonrecurring Basis |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Impaired loans, net of specific reserves of $1,451 | $ | — |  |  | $ | — |  |  | $ | 13,902 |  |  | $ | 13,902 |
Other real estate owned | — |  |  | — |  |  | 1,449 |  |  | 1,449 |
Total assets - nonrecurring fair value measurements | $ | — |  |  | $ | — |  |  | $ | 15,351 |  |  | $ | 15,351 |
| December 31, 2016
| Fair Value Measurements at the End of the Reporting Period Using
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
(amounts in thousands) |
Measured at Fair Value on a Recurring Basis |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |
Agency-guaranteed residential mortgage-backed securities | $ | — |  |  | $ | 231,263 |  |  | $ | — |  |  | $ | 231,263 |
Agency-guaranteed commercial mortgage-backed securities | — |  |  | 201,817 |  |  | — |  |  | 201,817 |
Corporate notes | — |  |  | 45,148 |  |  | — |  |  | 45,148 |
Equity securities | 15,246 |  |  | — |  |  | — |  |  | 15,246 |
Derivatives | — |  |  | 10,819 |  |  | 45 |  |  | 10,864 |
Loans held for sale – fair value option | — |  |  | 2,117,510 |  |  | — |  |  | 2,117,510 |
Total assets - recurring fair value measurements | $ | 15,246 |  |  | $ | 2,606,557 |  |  | $ | 45 |  |  | $ | 2,621,848 |
Liabilities |  |  |  |  |  |  |
Derivatives | $ | — |  |  | $ | 14,172 |  |  | $ | — |  |  | $ | 14,172 |
Measured at Fair Value on a Nonrecurring Basis |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Impaired loans, net of specific reserves of $1,360 | $ | — |  |  | $ | — |  |  | $ | 6,527 |  |  | $ | 6,527 |
Other real estate owned | — |  |  | — |  |  | 2,731 |  |  | 2,731 |
Total assets - nonrecurring fair value measurements | $ | — |  |  | $ | — |  |  | $ | 9,258 |  |  | $ | 9,258 |
Statement of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis | The changes in Level 3 assets and liabilities measured at fair value on a recurring basis at December 31, 2017 and 2016, were as follows:
|  | For the Years Ended December 31,
|  | 2017 |  | 2016
|  | Residential Mortgage Loan Commitments
(amounts in thousands) |  |  |  |
Balance at December 31, |  | $ | 45 |  |  | $ | 45 |
Issuances |  | 360 |  |  | 400 |
Settlements |  | (345 | ) |  | (400 | )
Balance at December 31, |  | $ | 60 |  |  | $ | 45 |
Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis | The following table summarizes financial assets and financial liabilities measured at fair value as of December 31, 2017 and 2016, for which Customers utilized Level 3 inputs to measure fair value:
| Quantitative Information about Level 3 Fair Value Measurements
December 31, 2017 | Fair Value Estimate |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (4)
(dollars in thousands) |
Impaired loans | $ | 13,902 |  |  | Collateral appraisal (1) |  | Liquidation expenses (2) |  | (8 | )%
Other real estate owned | 1,449 |  |  | Collateral appraisal (1) |  | Liquidation expenses (2) |  | (8 | )%
Residential mortgage loan commitments | 60 |  |  | Adjusted market bid |  | Pull-through rate |  | 90 | %
| Quantitative Information about Level 3 Fair Value Measurements
December 31, 2016 | Fair Value Estimate |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (4)
(dollars in thousands) |
Impaired loans | $ | 1,431 |  |  | Collateral appraisal (1) |  | Liquidation expenses (2) |  | (8 | )%
Impaired loans | 5,096 |  |  | Discounted cash flow |  | Projected cash flows (3) |  | 4 times EBIDTA |
Other real estate owned | 2,731 |  |  | Collateral appraisal (1) |  | Liquidation expenses (2) |  | (8 | )%
Residential mortgage loan commitments | 45 |  |  | Adjusted market bid |  | Pull-through rate |  | 90 | %
(1) | Obtained from approved independent appraisers. Appraisals are current and in compliance with credit policy. Customers does not generally discount appraisals.
(2) | Fair value is adjusted for estimated costs to sell based on a percentage of the value determined by appraisal.
(3) | Projected cash flows of the business derived using EBITDA (Earnings Before Interest, Taxes, Depreciation and Amortization) multiple based on management's best estimate.
(4) | Presented as a percentage of the value determined by appraisal for impaired loans and other real estate owned.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -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 (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: 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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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + 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 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -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 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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