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Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Securities have been in a continuous unrealized loss position, number of positions | 32 | 62
Securities have been in a continuous unrealized loss position, fair value | $ 238,435,000 | $ 441,043,000
Securities have been in a continuous unrealized loss position, unrealized losses | 9,941,000 | 10,101,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 26,453,000 | 146,957,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 253,000 | 1,363,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 211,982,000 | 294,086,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 9,688,000 | 8,738,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 253,000 | $ 1,363,000
Other Debt Obligations [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 27 | 29
Securities have been in a continuous unrealized loss position, fair value | $ 210,623,000 | $ 222,187,000
Securities have been in a continuous unrealized loss position, unrealized losses | 9,849,000 | 8,162,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 7,293,000 | 25,451,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 183,000 | 108,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 203,330,000 | 196,736,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 9,666,000 | 8,054,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 183,000 | $ 108,000
FNMA [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 1 | 8
Securities have been in a continuous unrealized loss position, fair value | $ 8,652,000 | $ 67,618,000
Securities have been in a continuous unrealized loss position, unrealized losses | 22,000 | 426,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 0 | 19,073,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 138,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 8,652,000 | 48,545,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 22,000 | 288,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 0 | $ 138,000
Collateralized Mortgage Backed Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 5 | 33
Securities have been in a continuous unrealized loss position, fair value | $ 27,812,000 | $ 218,856,000
Securities have been in a continuous unrealized loss position, unrealized losses | 92,000 | 1,939,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 19,160,000 | 121,506,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 70,000 | 1,255,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 8,652,000 | 97,350,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 22,000 | 684,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 70,000 | $ 1,255,000
Corporate Debt Securities [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 14 | 16
Securities have been in a continuous unrealized loss position, fair value | $ 113,324,000 | $ 123,050,000
Securities have been in a continuous unrealized loss position, unrealized losses | 6,676,000 | 6,950,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 113,324,000 | 123,050,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 6,676,000 | 6,950,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 0 | $ 0
Collateralized Loan Obligations [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 13 | 13
Securities have been in a continuous unrealized loss position, fair value | $ 97,299,000 | $ 99,137,000
Securities have been in a continuous unrealized loss position, unrealized losses | 3,173,000 | 1,212,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 7,293,000 | 25,451,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 183,000 | 108,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 90,006,000 | 73,686,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 2,990,000 | 1,104,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 183,000 | $ 108,000
REMIC and CMO [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 2 | 23
Securities have been in a continuous unrealized loss position, fair value | $ 5,663,000 | $ 120,989,000
Securities have been in a continuous unrealized loss position, unrealized losses | 39,000 | 1,440,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 5,663,000 | 102,384,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 39,000 | 1,117,000
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 0 | 18,605,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 0 | 323,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 39,000 | $ 1,117,000
FHLMC [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 1 | 1
Securities have been in a continuous unrealized loss position, fair value | $ 13,449,000 | $ 30,200,000
Securities have been in a continuous unrealized loss position, unrealized losses | 31,000 | 73,000
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 13,449,000 | 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 31,000 | 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 0 | 30,200,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 0 | 73,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 31,000 | $ 0
GNMA [Member] |  |
Securities have been in a continuous unrealized loss position, number of positions | 1 | 1
Securities have been in a continuous unrealized loss position, fair value | $ 48,000 | $ 49,000
Securities have been in a continuous unrealized loss position, unrealized losses |  | 0
Securities have been in a continuous unrealized loss position, less than 12 months, fair value | 48,000 | 49,000
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Securities have been in a continuous unrealized loss position, 12 months or more, fair value | 0 | 0
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses | 0 | 0
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 0 | $ 0
Maximum [Member] | GNMA [Member] |  |
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | 1,000 |
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses | $ 1,000 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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