Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ (6)		$ 7
Off-Balance Sheet, Credit Loss, Liability	3,300	$ 3,100	1,500
Loans, net of deferred fees and costs (b)(c)	3,472,085		2,876,147	$ 2,873,525
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans, net of deferred fees and costs (b)(c)	3,472,085		2,876,147	2,873,525
Off-Balance Sheet, Credit Loss, Liability	3,300	$ 3,100	1,500
Recorded investment in loans individually evaluated for impairment	1,000
Financing Receivable Loan Relationship Aggregate Credit Exposure Evaluation Threshold	1,000
Stockholders' Equity Attributable to Parent	$ 566,856			594,393
U.S. government sponsored agencies
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loss Given Default Rate	0.00%
Accounting Standards Update 2016-13 [Member]
Accounting Policies [Abstract]
Loans, net of deferred fees and costs (b)(c)			2,622
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans, net of deferred fees and costs (b)(c)			2,622
Accounting Standards Update 2016-13 [Member] | Consumer, direct
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			2,447
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			2,447
Accounting Standards Update 2016-13 [Member] | Commercial real estate, other
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			(537)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(537)
Accounting Standards Update 2016-13 [Member] | Commercial Real Estate [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			1,989
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			1,989
Accounting Standards Update 2016-13 [Member] | Residential real estate
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			(2,748)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			(2,748)
Accounting Standards Update 2016-13 [Member] | Home equity lines of credit
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			3,064
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			3,064
Accounting Standards Update 2016-13 [Member] | Home Equity Loan
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			960
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			960
Accounting Standards Update 2016-13 [Member] | Consumer, Other Loan [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			594
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			594
Accounting Standards Update 2016-13 [Member] | Bank Overdrafts [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			0
Accounting Standards Update 2016-13 [Member] | Total loans
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			5,769
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			5,769
Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Accounting Policies [Abstract]
Off-Balance Sheet, Credit Loss, Liability			1,495
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability			1,495
Pre-adoption allowance [Member] | Consumer, direct
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				2,942
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				2,942
Pre-adoption allowance [Member] | Commercial real estate, other
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				1,188
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				1,188
Pre-adoption allowance [Member] | Commercial Real Estate [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				6,560
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				6,560
Pre-adoption allowance [Member] | Residential real estate
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				8,568
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				8,568
Pre-adoption allowance [Member] | Home equity lines of credit
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				1,296
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				1,296
Pre-adoption allowance [Member] | Home Equity Loan
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				612
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				612
Pre-adoption allowance [Member] | Consumer, Other Loan [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				296
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				296
Pre-adoption allowance [Member] | Bank Overdrafts [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				94
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				94
Pre-adoption allowance [Member] | Total loans
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss				21,556
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss				21,556
Post adoption allowance [Member] | Consumer, direct
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			5,389
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			5,389
Post adoption allowance [Member] | Commercial real estate, other
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			651
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			651
Post adoption allowance [Member] | Commercial Real Estate [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			8,549
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			8,549
Post adoption allowance [Member] | Residential real estate
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			5,820
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			5,820
Post adoption allowance [Member] | Home equity lines of credit
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			4,360
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			4,360
Post adoption allowance [Member] | Home Equity Loan
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			1,572
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			1,572
Post adoption allowance [Member] | Consumer, Other Loan [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			890
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			890
Post adoption allowance [Member] | Bank Overdrafts [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			94
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			94
Post adoption allowance [Member] | Total loans
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss			27,325
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			27,325
Post adoption allowance [Member] | Commitments to Extend Credit [Member]
Accounting Policies [Abstract]
Off-Balance Sheet, Credit Loss, Liability			1,495
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability			1,495
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity Attributable to Parent	$ 177,012			$ 187,149
Retained Earnings | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity Attributable to Parent			(3,709)
Cumulative Effect of Adoption of ASU 2016-13			$ 3,700