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Loans and Allowance for Credit Losses on Loans - Outstanding and Aging Analysis (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | $ 2,002,767,000 |  | $ 2,088,556,000
Non-accrual loans with no allowance | 9,190,000 |  | 9,233,000
Loans past due more than 90 days still accruing | 0 |  | 0
Financing receivable, nonaccrual, earning interest on cash basis | 0 |  | 0
Financing receivable, nonaccrual, interest income | $ 0 | $ 0 |
Financing receivable, number of loans placed on nonaccrual status | loan | 0 |  |
Financing receivable, accrued interest, writeoff |  | $ 20,000 |
Commercial loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | $ 423,646,000 |  | 498,408,000
Non-accrual loans with no allowance | 0 |  | 0
Commercial real estate loans | Commercial owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 296,407,000 |  | 304,963,000
Non-accrual loans with no allowance | 7,148,000 |  | 7,147,000
Commercial real estate loans | Commercial investor-owned |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 967,335,000 |  | 961,208,000
Non-accrual loans with no allowance | 1,597,000 |  | 1,610,000
Commercial real estate loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 80,841,000 |  | 73,046,000
Non-accrual loans with no allowance | 0 |  | 0
Residential loans | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 92,510,000 |  | 104,813,000
Non-accrual loans with no allowance | 445,000 |  | 459,000
Residential loans | Other residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 120,903,000 |  | 123,395,000
Non-accrual loans with no allowance | 0 |  | 0
Consumer loans | Installment and other consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 21,125,000 |  | 22,723,000
Non-accrual loans with no allowance | 0 |  | 17,000
Financial asset, other than financial asset acquired with credit deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 2,002,767,000 |  | 2,088,556,000
Non-accrual | 9,190,000 |  |
Financial asset, other than financial asset acquired with credit deterioration | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 1,366,000 |  | 2,705,000
Financial asset, other than financial asset acquired with credit deterioration | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 367,000 |  | 2,083,000
Non-accrual |  |  | 9,233,000
Financial asset, other than financial asset acquired with credit deterioration | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 121,000 |  | 622,000
Financial asset, other than financial asset acquired with credit deterioration | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 878,000 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 2,001,401,000 |  | 2,085,851,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 423,646,000 |  | 498,408,000
Non-accrual | 0 |  |
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 367,000 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 367,000 |  | 0
Non-accrual |  |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 423,279,000 |  | 498,408,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 296,407,000 |  | 304,963,000
Non-accrual | 7,148,000 |  |
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Non-accrual |  |  | 7,147,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial owner-occupied | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 296,407,000 |  | 304,963,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 967,335,000 |  | 961,208,000
Non-accrual | 1,597,000 |  |
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 878,000 |  | 1,673,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 1,673,000
Non-accrual |  |  | 1,610,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 878,000 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial investor-owned | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 966,457,000 |  | 959,535,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 80,841,000 |  | 73,046,000
Non-accrual | 0 |  |
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Non-accrual |  |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 80,841,000 |  | 73,046,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 92,510,000 |  | 104,813,000
Non-accrual | 445,000 |  |
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 121,000 |  | 274,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 274,000
Non-accrual |  |  | 459,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 121,000 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 92,389,000 |  | 104,539,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 120,903,000 |  | 123,395,000
Non-accrual | 0 |  |
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Non-accrual |  |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 120,903,000 |  | 123,395,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 21,125,000 |  | 22,723,000
Non-accrual | 0 |  |
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | Total past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 758,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 136,000
Non-accrual |  |  | 17,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | 60-89 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 622,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | 90 days or more past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer loans | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans at amortized cost | $ 21,125,000 |  | $ 21,965,000

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