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Investment Securities - Unrealized losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities |  |
Debt securities, amortized cost | $ 689,001 | $ 466,747
Less than 12 Months, Fair Value | 105,252 | 159,032
12 Months or More, Fair Value | 81,237 | 88,855
Total Fair Value | 186,489 | 247,887
Less than 12 Months, Unrealized Losses | (1,085) | (2,476)
12 Months or More, Unrealized Losses | (1,195) | (2,213)
Total Unrealized Losses | (2,280) | (4,689)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Debt securities, amortized cost | 651 | 14,740
Less than 12 Months, Fair Value |  | 0
12 Months or More, Fair Value |  | 13,713
Total Fair Value |  | 13,713
Less than 12 Months, Unrealized Losses |  | 0
12 Months or More, Unrealized Losses |  | (258)
Total Unrealized Losses |  | (258)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Debt securities, amortized cost | 361,734 | 89,574
Less than 12 Months, Fair Value | 36,209 | 65,606
12 Months or More, Fair Value | 0 | 0
Total Fair Value | 36,209 | 65,606
Less than 12 Months, Unrealized Losses | (339) | (1,428)
12 Months or More, Unrealized Losses | 0 | 0
Total Unrealized Losses | (339) | (1,428)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Debt securities, amortized cost | 214,203 | 198,125
Less than 12 Months, Fair Value | 30,755 | 71,650
12 Months or More, Fair Value | 77,337 | 69,518
Total Fair Value | 108,092 | 141,168
Less than 12 Months, Unrealized Losses | (385) | (932)
12 Months or More, Unrealized Losses | (1,095) | (1,883)
Total Unrealized Losses | (1,480) | (2,815)
Private label residential mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Debt securities, amortized cost | 82,413 | 155,308
Less than 12 Months, Fair Value | 25,407 | 17,811
12 Months or More, Fair Value | 0 | 5,624
Total Fair Value | 25,407 | 23,435
Less than 12 Months, Unrealized Losses | (242) | (81)
12 Months or More, Unrealized Losses | 0 | (72)
Total Unrealized Losses | (242) | (153)
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities |  |
Debt securities, amortized cost | 30,000 | 9,000
Less than 12 Months, Fair Value | 12,881 | 3,965
12 Months or More, Fair Value | 3,900 | 0
Total Fair Value | 16,781 | 3,965
Less than 12 Months, Unrealized Losses | (119) | (35)
12 Months or More, Unrealized Losses | (100) | 0
Total Unrealized Losses | $ (219) | $ (35)

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