Securities (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2020 USD ($)	Jun. 30, 2020 USD ($) item security	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item security	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Securities, Trading, and Equity Securities, FV-NI, Total		$ 0		$ 0		$ 0
Number of securities in portfolio | security		3		3
Number of portfolio securities modeled structured | security		2		2
Accrued interest receivable on held-to-maturity securities		$ 100		$ 100
Allowance for credit loss		0		0
Accrued interest receivable on available-for-sale debt securities		1,800		1,800
Proceeds from Sale of Debt Securities, Available-for-sale		$ 66,200	$ 26,400	$ 130,800	$ 26,400
Held-to-maturity Securities [Member]
Number of active forbearances | item		1		1
Outstanding balance in active forbearance		$ 20,900		$ 20,900
Collateralized Mortgage Obligations by Commercial Real Estate [Member]
Private Issue Collateralized Mortgage Obligations, Number		0		0		0
Accounting Standards Update 2016-13 [Member]
Increase in allowance for held-to-maturity debt securities	$ 300