Federal Home Loan Bank Advances (Summary of Outstanding FHLB Advances) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 674,870	$ 426,326
1.57% advance due June 2019
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 0	1,991
Interest rate	1.57%
1.75% advance due June 2020
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 3,981	3,940
Interest rate	1.75%
1.72% advance due June 2020
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 2,487	2,461
Interest rate	1.72%
1.88% advance due June 2021
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 2,960	2,934
Interest rate	1.88%
4.18% advance due February 2022
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 0	25,000
Interest rate	4.18%
1.52% advance due March 2022
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 0	50,000
Interest rate	1.52%
1.45% advance due May 2022
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 0	50,000
Interest rate	1.45%
1.46% advance due May 2022
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 0	90,000
Interest rate	1.46%
1.98% advance due January 2023
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 0	100,000
Interest rate	1.98%
0.00% advance due April 2024
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 442	0
Interest rate	0.00%
2.98% advance due August 2024
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 25,000	0
Interest rate	2.98%
2.05% variable-rate advance due January 2028
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 100,000	100,000
Interest rate	2.05%
0.41% advance due February 2029
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 440,000	0
Interest rate	0.41%
1.36% advance due December 2029
Federal Home Loan Bank, Advances, Branch Of FHLB Bank [Line Items]
Federal Home Loan Bank advances	$ 100,000	$ 0
Interest rate	1.36%