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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2020
Assets and liabilities measured at fair value on a recurring basis | The following table represents financial instruments reported on the consolidated statements of condition at their fair value as of December 31, 2020 by level within the fair value measurement hierarchy. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements at | ​
​ | ​ | ​ | ​ | ​ | Reporting Date Using | ​
​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
​ | ​ | ​ | ​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Prices in | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Active | ​ | Significant | ​ | ​ | ​ | ​
​ | ​ | Assets/Liabilities | ​ | Markets for | ​ | Other | ​ | Significant | ​
​ | ​ | Measured at | ​ | Identical | ​ | Observable | ​ | Unobservable | ​
​ | ​ | Fair Value | ​ | Assets | ​ | Inputs | ​ | Inputs | ​
​ | ​ | December 31, 2020 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​
Measured on a recurring basis: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for sale debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage-backed securities | ​ | $ | 3,029,954 | ​ | $ | — | ​ | $ | 3,029,954 | ​ | $ | — | ​
States and political subdivisions | ​ |  | 50,814 | ​ |  | — | ​ |  | 50,814 | ​ |  | — | ​
Equity Securities | ​ |  | 6,202 | ​ |  | 6,202 | ​ |  | — | ​ |  | — | ​
​ | ​ | $ | 3,086,970 | ​ | $ | 6,202 | ​ | $ | 3,080,768 | ​ | $ | — | ​
​ The following table represents financial instruments reported on the consolidated balance sheets at their fair value as of December 31, 2019 by level within the fair value measurement hierarchy. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements at | ​
​ | ​ | ​ | ​ | ​ | Reporting Date Using | ​
​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
​ | ​ | ​ | ​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Prices in | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Active | ​ | Significant | ​ | ​ | ​ | ​
​ | ​ | Assets/Liabilities | ​ | Markets for | ​ | Other | ​ | Significant | ​
​ | ​ | Measured at | ​ | Identical | ​ | Observable | ​ | Unobservable | ​
​ | ​ | Fair Value | ​ | Assets | ​ | Inputs | ​ | Inputs | ​
​ | ​ | December 31, 2019 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​
Measured on a recurring basis: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for sale securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage - backed securities | ​ | $ | 3,285,548 | ​ | $ | — | ​ | $ | 3,285,548 | ​ | $ | — | ​
States and political subdivisions | ​ |  | 93,375 | ​ |  | — | ​ |  | 93,375 | ​ |  | — | ​
Equity Securities | ​ |  | 6,095 | ​ |  | 6,095 | ​ |  | — | ​ |  | — | ​
​ | ​ | $ | 3,385,018 | ​ | $ | 6,095 | ​ | $ | 3,378,923 | ​ | $ | — | ​
Assets measured at fair value on a non-recurring basis | The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the period ended December 31, 2020 by level within the fair value measurement hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements at Reporting | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Date Using | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | (in thousands) | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets/Liabilities | ​ | Prices in | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Measured at | ​ | Active | ​ | Significant | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value | ​ | Markets for | ​ | Other | ​ | Significant | ​ | Net Provision
​ | ​ | Period ended | ​ | Identical | ​ | Observable | ​ | Unobservable | ​ | (Credit)
​ | ​ | December 31, | ​ | Assets | ​ | Inputs | ​ | Inputs | ​ | During
​ | ​ | 2020 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Period
Measured on a non-recurring basis: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Watch-List doubtful loans | ​ | $ | 393 | ​ | $ | — | ​ | $ | — | ​ | $ | 393 | ​ | $ | (86)
Other real estate owned | ​ |  | 6,241 | ​ |  | — | ​ |  | — | ​ |  | 6,241 | ​ |  | 1,539
​ The following table represents financial instruments measured at fair value on a non-recurring basis as of and for the year ended December 31, 2019 by level within the fair value measurement hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Fair Value Measurements at Reporting | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Date Using | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | (in thousands) | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Quoted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets/Liabilities | ​ | Prices in | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Measured at | ​ | Active | ​ | Significant | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value | ​ | Markets | ​ | Other | ​ | Significant | ​ | Net (Credit)
​ | ​ | Year ended | ​ | for Identical | ​ | Observable | ​ | Unobservable | ​ | Provision
​ | ​ | December 31, | ​ | Assets | ​ | Inputs | ​ | Inputs | ​ | During
​ | ​ | 2019 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Period
Measured on a non-recurring basis: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 826 | ​ | $ | — | ​ | $ | — | ​ | $ | 826 | ​ | $ | 43
Other real estate owned | ​ |  | 21,614 | ​ |  | — | ​ |  | — | ​ |  | 21,614 | ​ |  | 322
Equity investment without a readily determinable fair value | ​ | ​ | 28,166 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 28,166 | ​ | ​ | 4,775

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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=117815213&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=117815213&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=117815213&loc=d3e19207-110258 + 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/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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