Allowance for Credit Losses - Amortized Cost Basis of Collateral Dependent Loans Individually Evaluated to Determine Credit Losses and Related ACL Allocated to Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Total Allowance for Credit Losses	$ 24,183	$ 20,800
Collateral Dependent Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	13,291
Total Allowance for Credit Losses	113
Collateral Dependent Loans | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	12,773
Collateral Dependent Loans | Cash
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	266
Collateral Dependent Loans | Equipment/Receivables
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	252
Collateral Dependent Loans | Residential Properties | Single Family
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	11,734
Collateral Dependent Loans | Residential Properties | Real Estate | Single Family
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	11,734
Collateral Dependent Loans | Commercial and Industrial Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	1,541
Total Allowance for Credit Losses	113
Collateral Dependent Loans | Commercial and Industrial Loans | Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	1,039
Collateral Dependent Loans | Commercial and Industrial Loans | Cash
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	250
Collateral Dependent Loans | Commercial and Industrial Loans | Equipment/Receivables
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	252
Collateral Dependent Loans | Consumer Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	16
Collateral Dependent Loans | Consumer Loans | Cash
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 16