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Loans Receivable - Components of Loans Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable | $ 4,468,647 | $ 3,767,879 |
Loans receivable, net | 4,468,647 | 3,767,879 |
Allowance for credit losses on loans | 70,185 | 36,171 | $ 37,993
Loans receivable, net | 4,398,462 | 3,731,708 |
Financing Receivable, Unamortized Purchase Premium (Discount) | 6,575 | 8,371 |
Financing Receivable, Unamortized Loan Fee (Cost) and Purchase Premium (Discount) | $ (15,458) | $ 2,441 |
Real estate construction and land development | Commercial Business |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 88.20% | 82.70% |
Loans and Finance Receivables [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for credit losses on loans | $ 0 |  |
Commercial business |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable | 3,715,206 | $ 2,946,233 |
Loans receivable, net | 3,715,206 | 2,946,233 |
Allowance for credit losses on loans |  |  | 20,998
Commercial business | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 852,220 |
Loans receivable, net | 733,098 | 852,220 |
Allowance for credit losses on loans |  |  | 10,391
Commercial business | Owner-occupied CRE |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 805,234 |
Loans receivable, net | 856,684 | 805,234 |
Allowance for credit losses on loans |  |  | 4,964
Commercial business | Non-owner occupied CRE |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 1,288,779 |
Loans receivable, net | 1,410,303 | 1,288,779 |
Allowance for credit losses on loans |  |  | 5,643
Commercial business | Paycheck Protection Program [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, net | 715,121 | 0 |
Allowance for credit losses on loans |  |  | 0
Residential real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 131,660 |
Loans receivable, net | 122,756 | 131,660 |
Allowance for credit losses on loans |  |  | 2,929
Real estate construction and land development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable | 305,713 | 274,646 |
Loans receivable, net | 305,713 | 274,646 |
Allowance for credit losses on loans |  |  | 9,729
Real estate construction and land development | Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 104,296 |
Loans receivable, net | 78,259 | 104,296 |
Allowance for credit losses on loans |  |  | 884
Real estate construction and land development | Commercial and multifamily |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 170,350 |
Loans receivable, net | 227,454 | 170,350 |
Allowance for credit losses on loans |  |  | 8,845
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans receivable |  | 415,340 |
Loans receivable, net | $ 324,972 | $ 415,340 |
Allowance for credit losses on loans |  |  | $ 4,337

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