Derivatives (Narrative) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 17, 2019	May 22, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Notional amount													$ 50,000,000
Interest expense	$ 10,337,000	$ 10,990,000	$ 11,211,000	$ 11,143,000	$ 9,953,000	$ 9,568,000	$ 9,061,000	$ 7,148,000		$ 43,681,000	$ 35,730,000	$ 21,709,000
Collateral posted										6,600,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Cash Flow Hedge [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ 2,237,000	827,000
FHLB [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense										827,000
Cash Flow Hedging [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Notional amount	$ 200,000,000				$ 150,000,000					$ 200,000,000	$ 150,000,000			$ 150,000,000