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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis | The table below presents the carrying values of assets and liabilities measured at fair value on a recurring basis at December 31, 2020 and 2019. There were no transfers among levels during these years.
|  | Fair Value Measurements Using
(In thousands) | Total Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
December 31, 2020 |  |  |  |
Assets: |  |  |  |
Residential mortgage loans held for sale | $ | 39,396 |  | $ | — |  | $ | 39,396 |  | $ | — |
Available for sale debt securities: |  |  |  |
U.S. government and federal agency obligations | 838,059 |  | 838,059 |  | — |  | — |
Government-sponsored enterprise obligations | 54,485 |  | — |  | 54,485 |  | — |
State and municipal obligations | 2,045,099 |  | — |  | 2,037,131 |  | 7,968 |
Agency mortgage-backed securities | 6,712,085 |  | — |  | 6,712,085 |  | — |
Non-agency mortgage-backed securities | 361,074 |  | — |  | 361,074 |  | — |
Asset-backed securities | 1,882,243 |  | — |  | 1,882,243 |  | — |
Other debt securities | 556,219 |  | — |  | 556,219 |  | — |
Trading debt securities | 35,321 |  | — |  | 35,321 |  | — |
Equity securities | 2,966 |  | 2,966 |  | — |  | — |
Private equity investments | 94,368 |  | — |  | — |  | 94,368 |
Derivatives * | 89,889 |  | — |  | 86,447 |  | 3,442 |
Assets held in trust for deferred compensation plan | 19,278 |  | 19,278 |  | — |  | — |
Total assets | 12,730,482 |  | 860,303 |  | 11,764,401 |  | 105,778 |
Liabilities: |  |  |  |
Derivatives * | 18,675 |  | — |  | 17,974 |  | 701
Liabilities held in trust for deferred compensation plan | 19,278 |  | 19,278 |  | — |  | — |
Total liabilities | $ | 37,953 |  | $ | 19,278 |  | $ | 17,974 |  | $ | 701 |
December 31, 2019 |  |  |  |
Assets: |  |  |  |
Residential mortgage loans held for sale | $ | 9,181 |  | $ | — |  | $ | 9,181 |  | $ | — |
Available for sale debt securities: |  |  |  |
U.S. government and federal agency obligations | 851,776 |  | 851,776 |  | — |  | — |
Government-sponsored enterprise obligations | 139,277 |  | — |  | 139,277 |  | — |
State and municipal obligations | 1,267,927 |  | — |  | 1,258,074 |  | 9,853 |
Agency mortgage-backed securities | 3,937,964 |  | — |  | 3,937,964 |  | — |
Non-agency mortgage-backed securities | 809,782 |  | — |  | 809,782 |  | — |
Asset-backed securities | 1,233,489 |  | — |  | 1,233,489 |  | — |
Other debt securities | 331,411 |  | — |  | 331,411 |  | — |
Trading debt securities | 28,161 |  | — |  | 28,161 |  | — |
Equity securities | 2,929 |  | 2,929 |  | — |  | — |
Private equity investments | 94,122 |  | — |  | — |  | 94,122 |
Derivatives * | 105,674 |  | — |  | 105,075 |  | 599 |
Assets held in trust for deferred compensation plan | 16,518 |  | 16,518 |  | — |  | — |
Total assets | 8,828,211 |  | 871,223 |  | 7,852,414 |  | 104,574 |
Liabilities: |  |  |  |
Derivatives * | 10,219 |  | — |  | 9,989 |  | 230 |
Liabilities held in trust for deferred compensation plan | 16,518 |  | 16,518 |  | — |  | — |
Total liabilities | $ | 26,737 |  | $ | 16,518 |  | $ | 9,989 |  | $ | 230 |
* The fair value of each class of derivative is shown in Note 19.
Summary 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 are summarized as follows:
| Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
(In thousands) | State and Municipal Obligations | Private Equity Investments | Derivatives | Total
Year ended December 31, 2020: |  |  |  |
Balance at January 1, 2020 | $ | 9,853 |  | $ | 94,122 |  | $ | 369 |  | $ | 104,344 |
Total gains or losses (realized/unrealized): |  |  |  |
Included in earnings | — |  | (10,103) |  | 3,181 |  | (6,922) |
Included in other comprehensive income | (2) |  | — |  | — |  | (2) |
Investment securities called | (2,000) |  | — |  | — |  | (2,000) |
Discount accretion | 117 |  | — |  | — |  | 117 |
Purchases of private equity securities | — |  | 10,684 |  | — |  | 10,684 |
Sale / pay down of private equity securities | — |  | (364) |  | — |  | (364) |
Capitalized interest/dividends | — |  | 29 |  | — |  | 29 |
Purchase of risk participation agreement | — |  | — |  | — |  | — |
Sale of risk participation agreement | — |  | — |  | (809) |  | (809) |
Balance at December 31, 2020 | $ | 7,968 |  | $ | 94,368 |  | $ | 2,741 |  | $ | 105,077 |
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2020 | $ | — |  | $ | (10,083) |  | $ | 3,611 |  | $ | (6,472) |
Total gains or losses for the year included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2020 | $ | 44 |  | $ | — |  | $ | — |  | $ | 44 |
Year ended December 31, 2019: |  |  |  |
Balance at January 1, 2019 | $ | 14,158 |  | $ | 85,659 |  | $ | 490 |  | $ | 100,307 |
Total gains or losses (realized/unrealized): |  |  |  |
Included in earnings | — |  | (727) |  | (93) |  | (820) |
Included in other comprehensive income | 246 |  | — |  | — |  | 246 |
Investment securities called | (4,635) |  | — |  | — |  | (4,635) |
Discount accretion | 84 |  | — |  | — |  | 84 |
Purchases of private equity securities | — |  | 15,706 |  | — |  | 15,706 |
Sale / pay down of private equity securities | — |  | (6,548) |  | — |  | (6,548) |
Capitalized interest/dividends | — |  | 32 |  | — |  | 32 |
Purchase of risk participation agreement | — |  | — |  | 439 |  | 439 |
Sale of risk participation agreement | — |  | — |  | (467) |  | (467) |
Balance at December 31, 2019 | $ | 9,853 |  | $ | 94,122 |  | $ | 369 |  | $ | 104,344 |
Total gains or losses for the year included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2019 | $ | — |  | $ | (2,177) |  | $ | 457 |  | $ | (1,720) |
Summary Of Gains And Losses On Level 3 Assets And Liabilities | Gains and losses on the Level 3 assets and liabilities in the table above are reported in the following income categories:
(In thousands) | Loan Fees and Sales | Other Non-Interest Income | Investment Securities Gains (Losses), Net | Total
Year ended December 31, 2020: |  |  |  |
Total gains or losses included in earnings | $ | 2,768 |  | $ | 413 |  | $ | (10,103) |  | $ | (6,922) |
Change in unrealized gains or losses relating to assets still held at December 31, 2020 | $ | 3,226 |  | $ | 385 |  | $ | (10,083) |  | $ | (6,472) |
Year ended December 31, 2019: |  |  |  |
Total gains or losses included in earnings | $ | (77) |  | $ | (16) |  | $ | (727) |  | $ | (820) |
Change in unrealized gains or losses relating to assets still held at December 31, 2019 | $ | 458 |  | $ | (1) |  | $ | (2,177) |  | $ | (1,720) |
Summary Of Quantitative Information About Level 3 Fair Value Measurements | Level 3 Inputs As shown above, the Company's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to auction rate securities (ARS) held by the Bank, investments in portfolio concerns held by the Company's private equity subsidiary, and held for sale residential mortgage loan commitments. ARS are included in state and municipal securities and totaled $8.0 million at December 31, 2020, while private equity investments, included in other securities, totaled $94.4 million. Information about these inputs is presented in the table and discussions below.
Quantitative Information about Level 3 Fair Value Measurements |  |  | Weighted
| Valuation Technique | Unobservable Input | Range | Average*
Auction rate securities | Discounted cash flow | Estimated market recovery period |  |  | 5 years | 5 years
|  | Estimated market rate | 1.5% | - | 1.7% | 1.5%
Private equity investments | Market comparable companies | EBITDA multiple | 4.0 | - | 6.0 | 5.4
Mortgage loan commitments | Discounted cash flow | Probability of funding | 56.7% | - | 98.8% | 85.7%
|  | Embedded servicing value | 0.5% | - | 1.0% | 0.9%
* Unobservable inputs were weighted by the relative fair value of the instruments.
Schedule Of Fair Value Disclosures Measured On Nonrecurring Basis [Table Text Block] | Instruments Measured at Fair Value on a Nonrecurring Basis For assets measured at fair value on a nonrecurring basis during 2020 and 2019, and still held as of December 31, 2020 and 2019, the following table provides the adjustments to fair value recognized during the respective periods, the level of valuation assumptions used to determine each adjustment, and the carrying value of the related individual assets or portfolios at December 31, 2020 and 2019.
|  | Fair Value Measurements Using |
(In thousands) | Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3) | Total Gains (Losses)
Balance at December 31, 2020 |  |  |  |  |
Collateral dependent loans | $ | 12,961 |  | $ | — |  | $ | — |  | $ | 12,961 |  | $ | (7,763) |
Mortgage servicing rights | 6,249 |  | — |  | — |  | 6,249 |  | (1,776) |
Long-lived assets | 811 |  | — |  | — |  | 811 |  | (9) |
Balance at December 31, 2019 |  |  |  |  |
Collateral dependent loans | $ | 422 |  | $ | — |  | $ | — |  | $ | 422 |  | $ | (263) |
Mortgage servicing rights | 7,749 |  | — |  | — |  | 7,749 |  | (327) |
Long-lived assets | 1,098 |  | — |  | — |  | 1,098 |  | (362) |
Information about Level Three Fair Value Measurements - Nonrecurring Basis | The Company's significant Level 3 measurements that are measured on a nonrecurring basis pertain to the Company's mortgage servicing rights retained on certain fixed rate personal real estate loan originations. Mortgage servicing rights are included in other assets on the consolidated balance sheet, and information about these inputs is presented in the table below.
Quantitative Information about Level 3 Fair Value Measurements |  |  |  | Weighted
| Valuation Technique | Unobservable Input | Range |  | Average*
Mortgage servicing rights | Discounted cash flow | Discount rate | 9.15 | % | - | 9.27 | % |  | 9.23 | %
|  | Prepayment speeds (CPR)* | 13.25 | % | - | 14.85 | % |  | 14.58 | %
|  | Loan servicing costs - annually per loan |  |  |  |  |
|  | Performing loans | $ | 71 |  | - | $ | 72 |  |  | $ | 72 |
|  | Delinquent loans | $ | 200 |  | - | $ | 750 |  |  |
|  | Loans in foreclosure | $ | 1,000 |  |  |  |  |
*Ranges and weighted averages based on interest rate tranches.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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