Loans and Allowance for Loan Losses - Loan Modification Due to COVID-19 (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modification term of loans modified due to COVID-19		6 months
Remaining modification term of loans modified due to COVID-19		4 months
COVID-19 Loan Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	$ 171,624	$ 171,624	$ 484,000
Expirations of modifications	220,500
Terminations of modification	106,700
Subsequent modifications	19,800
New modifications	1,900
COVID-19 Loan Modification | Payment Deferment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	166,195	166,195
COVID-19 Loan Modification | Interest Only Payment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	5,429	5,429
COVID-19 Loan Modification | Real Estate | Commercial property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	137,562	137,562
COVID-19 Loan Modification | Real Estate | Commercial property | Payment Deferment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	135,165	135,165
COVID-19 Loan Modification | Real Estate | Commercial property | Interest Only Payment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	2,397	2,397
COVID-19 Loan Modification | Real Estate | Residential property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	19,233	19,233
COVID-19 Loan Modification | Real Estate | Residential property | Payment Deferment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	19,233	19,233
COVID-19 Loan Modification | Real Estate | Residential property | Interest Only Payment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	0	0
COVID-19 Loan Modification | Commercial and Industrial | Commercial term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	14,757	14,757
COVID-19 Loan Modification | Commercial and Industrial | Commercial term | Payment Deferment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	11,797	11,797
COVID-19 Loan Modification | Commercial and Industrial | Commercial term | Interest Only Payment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	2,960	2,960
COVID-19 Loan Modification | Commercial and Industrial | SBA commercial term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	72	72
COVID-19 Loan Modification | Commercial and Industrial | SBA commercial term | Payment Deferment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	0	0
COVID-19 Loan Modification | Commercial and Industrial | SBA commercial term | Interest Only Payment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate carrying amount of loans modified due to COVID-19	$ 72	$ 72