Subsequent Events Subsequent Events (Details) - Subsequent Event $ in Thousands	Feb. 18, 2020 USD ($)
Subsequent Event [Line Items]
One-time cash payment to shareholder included with exchange of stock	$ 50,000
Charter Protection Agreement threshold of equity interest in Company that triggers dilution (percent)	25.00%
Charter Protection Agreement threshold of ownership in any class of the Company's voting securities triggering dilution (percent)	7.50%
Charter Protction Agreement threshold of ownership in any class of the Company's voting securities upon close of the exchange agreement triggering dilution (percent)	10.00%
Charter Protection Agreement, maximum term of agreement	18 months
Radius Bancorp, Inc. Merger
Subsequent Event [Line Items]
Consideration to be transferred	$ 185,000
Cash paid	138,750
Value of stock issued	46,250
Additional costs	$ 22,000
Estimated period to complete the merger	15 months