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Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 56,319 | $ 55,090 | $ 22,577 | $ 17,667 | $ 17,956 | $ 18,305 | $ 17,820
Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 13,618 |  |  |  |
Real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 4,048 |  |  |  |
Mortgage warehouse |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans | $ 1,250 | $ 1,190 | 0 | 1,077 | $ 1,041 | $ 1,040 | $ 1,006
Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 4,911 |  |  |  |
As Reported Under ASC 326 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 40,244 |  |  |  |
As Reported Under ASC 326 | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 25,614 |  |  |  |
As Reported Under ASC 326 | Real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 4,971 |  |  |  |
As Reported Under ASC 326 | Mortgage warehouse |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,077 |  |  |  |
As Reported Under ASC 326 | Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 8,582 |  |  |  |
Impact of adopting ASC 326 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 17,667 | 19,791 |  |  |
Impact of adopting ASC 326 | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 11,996 |  |  |  |
Impact of adopting ASC 326 | Real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 923 |  |  |  |
Impact of adopting ASC 326 | Mortgage warehouse |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | 1,077 | $ 0 |  |  |
Impact of adopting ASC 326 | Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 3,671 |  |  |  |

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