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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Investment Securities |
Schedule of amortized cost of investment securities to estimated fair values | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | 5,704 | ​ | $ | — | ​ | $ | (21) | ​ | $ | 5,683
Obligations of state and political agencies | ​ |  | 147,926 | ​ |  | 2,710 | ​ |  | (1,445) | ​ |  | 149,191
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  |
Residential agency | ​ |  | 529,717 | ​ |  | 2,146 | ​ |  | (10,268) | ​ |  | 521,595
Commercial | ​ |  | 85,060 | ​ |  | 2,650 | ​ |  | (13) | ​ |  | 87,697
Asset backed securities | ​ |  | 91 | ​ |  | 5 | ​ |  | — | ​ |  | 96
Corporate bonds | ​ |  | 30,545 | ​ |  | 707 | ​ |  | (417) | ​ |  | 30,835
Total available-for-sale investment securities | ​ | $ | 799,043 | ​ | $ | 8,218 | ​ | $ | (12,164) | ​ | $ | 795,097
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | 5,926 | ​ | $ | — | ​ | $ | (19) | ​ | $ | 5,907
Obligations of state and political agencies | ​ |  | 148,491 | ​ |  | 5,282 | ​ |  | — | ​ |  | 153,773
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  |
Residential agency | ​ |  | 303,760 | ​ |  | 3,395 | ​ |  | (436) | ​ |  | 306,719
Commercial | ​ |  | 89,300 | ​ |  | 5,678 | ​ |  | — | ​ |  | 94,978
Asset backed securities | ​ |  | 109 | ​ |  | 6 | ​ |  | — | ​ |  | 115
Corporate bonds | ​ |  | 30,552 | ​ |  | 388 | ​ |  | (90) | ​ |  | 30,850
Total available-for-sale investment securities | ​ | $ | 578,138 | ​ | $ | 14,749 | ​ | $ | (545) | ​ | $ | 592,342
Schedule of investment securities with gross unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | — | ​ | $ | — | ​ | $ | (21) | ​ | $ | 5,650 | ​ | $ | (21) | ​ | $ | 5,650
Obligations of state and political agencies | ​ |  | (1,445) | ​ |  | 51,463 | ​ |  | — | ​ |  | — | ​ |  | (1,445) | ​ |  | 51,463
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | (10,268) | ​ |  | 380,454 | ​ |  | — | ​ |  | — | ​ |  | (10,268) | ​ |  | 380,454
Commercial | ​ |  | (13) | ​ |  | 9,026 | ​ |  | — | ​ |  | — | ​ |  | (13) | ​ |  | 9,026
Asset backed securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 2
Corporate bonds | ​ |  | (417) | ​ |  | 13,583 | ​ |  | — | ​ |  | — | ​ |  | (417) | ​ |  | 13,583
Total available-for-sale investment securities | ​ | $ | (12,143) | ​ | $ | 454,526 | ​ | $ | (21) | ​ | $ | 5,652 | ​ | $ | (12,164) | ​ | $ | 460,178
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | (10) | ​ | $ | 4,509 | ​ | $ | (9) | ​ | $ | 1,309 | ​ | $ | (19) | ​ | $ | 5,818
Obligations of state and political agencies | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | (432) | ​ |  | 68,494 | ​ |  | (4) | ​ |  | 2,356 | ​ |  | (436) | ​ |  | 70,850
Commercial | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Asset backed securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 2
Corporate bonds | ​ |  | (90) | ​ |  | 16,454 | ​ |  | — | ​ |  | — | ​ |  | (90) | ​ |  | 16,454
Total available-for-sale investment securities | ​ | $ | (532) | ​ | $ | 89,457 | ​ | $ | (13) | ​ | $ | 3,667 | ​ | $ | (545) | ​ | $ | 93,124
Schedule of contractual maturity of amortized cost and estimated fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Due within one year or less | ​ | $ | 5,480 | ​ | $ | 5,506
Due after one year through five years | ​ |  | 32,626 | ​ |  | 33,180
Due after five years through ten years | ​ |  | 150,987 | ​ |  | 153,408
Due after 10 years | ​ |  | 609,950 | ​ |  | 603,003
Total available-for-sale investment securities | ​ | $ | 799,043 | ​ | $ | 795,097
Schedule of proceeds from the sale of available for sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ | ​ | March 31,
(dollars in thousands) |  | 2021 |  | 2020
Proceeds | ​ | $ | 13,189 | ​ | $ | 4,000
Realized gains | ​ |  | 114 | ​ |  | —
Realized losses | ​ |  | — | ​ |  | —
Schedule of federal home loan bank | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
(dollars in thousands) |  | 2021 |  | 2020
Federal Reserve | ​ | $ | 2,675 | ​ | $ | 2,675
FHLB | ​ |  | 3,864 | ​ |  | 3,090

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