Loans and Allowance for Credit Losses - Information related to nonaccrual loans by class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	$ 30,354
Nonaccrual with an Allowance for Credit Losses	30,589
Total Nonaccrual Loans	60,943	$ 48,729
Financing receivable, modifications, recorded investment	19,200	19,100
Interest lost on nonaccrual loans	3,700	3,000
Nonaccrual loans, recorded interest income	679	630
Performing Loans
Loans and Leases Receivable Disclosure [Line Items]
Financing receivable, modifications, recorded investment	10,500	16,600
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	3,263
Nonaccrual with an Allowance for Credit Losses	12,089
Total Nonaccrual Loans	15,352	14,928
Income producing - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	6,500
Nonaccrual with an Allowance for Credit Losses	12,380
Total Nonaccrual Loans	18,880	9,711
Owner occupied - commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	18,941
Nonaccrual with an Allowance for Credit Losses	4,217
Total Nonaccrual Loans	23,158	6,463
Real estate mortgage - residential
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	1,234
Nonaccrual with an Allowance for Credit Losses	1,697
Total Nonaccrual Loans	2,931	5,631
Construction - commercial and residential
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	0
Nonaccrual with an Allowance for Credit Losses	206
Total Nonaccrual Loans	206	11,509
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual with No Allowance for Credit Loss	416
Nonaccrual with an Allowance for Credit Losses	0
Total Nonaccrual Loans	$ 416	$ 487