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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Loans Modified as Troubled Debt Restructurings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Receivables [Abstract] |  |  |
Beginning balance | $ 1,813 | $ 1,061 | $ 602
Additions | 113 | 37 | 1,017
Net payments | (940) | (86) | (144)
Net transfers from (to) non-accrual | 785 | 801 | (414)
Ending balance | 1,771 | 1,813 | 1,061
Beginning balance | 7,314 | 1,569 | 552
Additions | 5,254 | 8,408 | 681
Net payments | (2,310) | (1,718) | (78)
Charge-offs | (673) | (144) |
Net transfers from (to) accrual | (785) | (801) | 414
Ending balance | 8,800 | 7,314 | 1,569
Total troubled debt restructurings | $ 10,571 | $ 9,127 | $ 2,630

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