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Loans and Allowance for Credit Losses - Outstanding and Aging Analysis (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 2,121,772,000 |  | $ 2,088,556,000
Non-accrual loans with no allowance | 9,205,000 |  | 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 | $ 13,000 |  |
Commercial loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 545,069,000 |  | 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] |  |  |
Total | 308,266,000 |  | 304,963,000
Non-accrual loans with no allowance | 7,147,000 |  | 7,147,000
Commercial real estate loans | Commercial investor-owned |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 955,021,000 |  | 961,208,000
Non-accrual loans with no allowance | 1,603,000 |  | 1,610,000
Commercial real estate loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 71,066,000 |  | 73,046,000
Non-accrual loans with no allowance | 0 |  | 0
Residential loans | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 96,575,000 |  | 104,813,000
Non-accrual loans with no allowance | 455,000 |  | 459,000
Residential loans | Other residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 124,383,000 |  | 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] |  |  |
Total | 21,392,000 |  | 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 past due | 2,021,000 |  | 2,705,000
Current | 2,119,751,000 |  | 2,085,851,000
Total | 2,121,772,000 |  | 2,088,556,000
Non-accrual | 9,205,000 |  |
Financial asset, other than financial asset acquired with credit deterioration | 30-59 days past due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans past due | 1,047,000 |  | 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 past due | 96,000 |  | 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 past due | 878,000 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans past due | 0 |  | 0
Current | 545,069,000 |  | 498,408,000
Total | 545,069,000 |  | 498,408,000
Non-accrual | 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 past due | 0 |  | 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 past due | 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 past due | 0 |  | 0
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 past due | 0 |  | 0
Current | 308,266,000 |  | 304,963,000
Total | 308,266,000 |  | 304,963,000
Non-accrual | 7,147,000 |  |
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 past due | 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 past due | 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 past due | 0 |  | 0
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 past due | 1,669,000 |  | 1,673,000
Current | 953,352,000 |  | 959,535,000
Total | 955,021,000 |  | 961,208,000
Non-accrual | 1,603,000 |  |
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 past due | 791,000 |  | 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 past due | 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 past due | 878,000 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans past due | 0 |  | 0
Current | 71,066,000 |  | 73,046,000
Total | 71,066,000 |  | 73,046,000
Non-accrual | 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 past due | 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 past due | 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 past due | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans past due | 216,000 |  | 274,000
Current | 96,359,000 |  | 104,539,000
Total | 96,575,000 |  | 104,813,000
Non-accrual | 455,000 |  |
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 past due | 120,000 |  | 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 past due | 96,000 |  | 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 past due | 0 |  | 0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans past due | 0 |  | 0
Current | 124,383,000 |  | 123,395,000
Total | 124,383,000 |  | 123,395,000
Non-accrual | 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 past due | 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 past due | 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 past due | 0 |  | 0
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 past due | 136,000 |  | 758,000
Current | 21,256,000 |  | 21,965,000
Total | 21,392,000 |  | 22,723,000
Non-accrual | 0 |  |
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 past due | 136,000 |  | 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 past due | 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 past due | $ 0 |  | $ 0

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