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Loans and Allowance for Credit Losses - Impaired loans, by class of loan (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2019
Unpaid Contractual Principal Balance |  | $ 54,883 |  | $ 54,883
Recorded Investment With No Allowance |  | 35,235 |  | 35,235
Recorded Investment With Allowance |  | 19,648 |  | 19,648
Total Recorded Investment |  | 54,883 |  | 54,883
Related Allowance |  | 9,124 |  | 9,124
Average Recorded Investment |  | 54,258 |  |
Interest Income Recognized | $ 717 |  | $ 701 | 941
Commercial |  |  |  |
Unpaid Contractual Principal Balance |  | 15,814 |  | 15,814
Recorded Investment With No Allowance |  | 11,858 |  | 11,858
Recorded Investment With Allowance |  | 3,956 |  | 3,956
Total Recorded Investment |  | 15,814 |  | 15,814
Related Allowance |  | 5,714 |  | 5,714
Average Recorded Investment |  | 15,682 |  |
Interest Income Recognized |  |  |  | 270
Income Producing - Commercial Real Estate |  |  |  |
Unpaid Contractual Principal Balance |  | 14,093 |  | 14,093
Recorded Investment With No Allowance |  | 2,713 |  | 2,713
Recorded Investment With Allowance |  | 11,380 |  | 11,380
Total Recorded Investment |  | 14,093 |  | 14,093
Related Allowance |  | 2,145 |  | 2,145
Average Recorded Investment |  | 18,133 |  |
Interest Income Recognized |  |  |  | 382
Owner Occupied - Commercial Real Estate |  |  |  |
Unpaid Contractual Principal Balance |  | 7,349 |  | 7,349
Recorded Investment With No Allowance |  | 6,388 |  | 6,388
Recorded Investment With Allowance |  | 961 |  | 961
Total Recorded Investment |  | 7,349 |  | 7,349
Related Allowance |  | 415 |  | 415
Average Recorded Investment |  | 6,107 |  |
Interest Income Recognized |  |  |  | 197
Real Estate Mortgage Residential |  |  |  |
Unpaid Contractual Principal Balance |  | 5,631 |  | 5,631
Recorded Investment With No Allowance |  | 3,175 |  | 3,175
Recorded Investment With Allowance |  | 2,456 |  | 2,456
Total Recorded Investment |  | 5,631 |  | 5,631
Related Allowance |  | 650 |  | 650
Average Recorded Investment |  | 5,638 |  |
Construction - Commercial and Residential |  |  |  |
Unpaid Contractual Principal Balance |  | 11,509 |  | 11,509
Recorded Investment With No Allowance |  | 11,101 |  | 11,101
Recorded Investment With Allowance |  | 408 |  | 408
Total Recorded Investment |  | 11,509 |  | 11,509
Related Allowance |  | 100 |  | 100
Average Recorded Investment |  | 8,211 |  |
Interest Income Recognized |  |  |  | 92
Home Equity |  |  |  |
Unpaid Contractual Principal Balance |  | 487 |  | 487
Recorded Investment With Allowance |  | 487 |  | 487
Total Recorded Investment |  | 487 |  | 487
Related Allowance |  | 100 |  | $ 100
Average Recorded Investment |  | $ 487 |  |

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