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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 44,227 | $ 37,386
Amortized cost one to five years | 41,322 | 41,230
Amortized cost for five to ten years | 114,900 | 117,004
Amortized cost for after ten years | 270,421 | 213,574
Total amortized cost | 470,870 | 409,194
Total available for sale investment securities, Amortized Cost | 880,136 | 822,089
Within one year, amortized cost | 10,082 | 7,811
One to five years, amortized cost | 51,401 | 56,037
Five to ten years, amortized cost | 91,291 | 94,756
After ten years, amortized cost | 30,704 | 32,163
Total amortized cost | 183,478 | 190,767
Investment securities, held to maturity | 199,467 | 207,899
Fair value within one year | 44,107 | 37,321
Fair value for one to five years | 41,175 | 41,293
Fair value for five to ten years | 119,147 | 122,145
Fair value for after ten years | 278,184 | 218,193
Total fair value | 482,613 | 418,952
Investment securities, available for sale | 900,476 | 834,776
Within one year, fair value | 10,127 | 7,874
One to five years, fair value | 52,364 | 57,048
five to ten years, fair value | 95,026 | 98,480
After ten years, fair value | 33,340 | 34,440
Total fair value | 190,857 | 197,842
Fair Value | 207,324 | 215,147
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 253,977 | 267,272
Investment securities, held to maturity | 3,693 | 4,560
Investment securities, available for sale | 257,813 | 269,252
Fair Value | 3,746 | 4,568
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 155,289 | 145,623
Investment securities, held to maturity | 12,296 | 12,572
Investment securities, available for sale | 160,050 | 146,572
Fair Value | $ 12,721 | $ 12,737

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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