Loans and Leases - Information Regarding Troubled Debt Restructurings (Details) - Non-Covered Loans - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	$ 41,903	$ 40,499
Multi-Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		3,577
Commercial Real Estate
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	15,040
One-to-Four Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	563	584
Acquisition, Development, and Construction
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		389
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	26,300	35,949
Accruing
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	15,905	1,254
Accruing | Commercial Real Estate
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	15,040
Accruing | Acquisition, Development, and Construction
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		389
Accruing | Commercial and Industrial
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	865	865
Non-Accrual
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	25,998	39,245
Non-Accrual | Multi-Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		3,577
Non-Accrual | One-to-Four Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	563	584
Non-Accrual | Commercial and Industrial
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	$ 25,435	$ 35,084