Borrowed Funds (FHLBB Advances) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amount
Within 1 year	$ 599,262	$ 603,590
Over 1 year to 2 years	139,762	160,073
Over 2 years to 3 years	3,210	580
Over 3 years to 4 years	0	3,214
Over 4 years to 5 years	4,025	0
Over 5 years	12,210	16,918
Total	758,469	784,375
Callable Amount
Within 1 year	0	0
Over 1 year to 2 years	0	0
Over 2 years to 3 years	0	0
Over 3 years to 4 years	0	0
Over 4 years to 5 years	0	0
Over 5 years	0	0
Total	$ 0	$ 0
Weighted Average Rate
Within 1 year (as a percent)	2.27%	2.19%
Over 1 year to 2 years (as a percent)	2.12%	2.64%
Over 2 years to 3 years (as a percent)	0.01%	3.07%
Over 3 years to 4 years (as a percent)	0.00%	0.03%
Over 4 years to 5 years (as a percent)	3.91%	0.00%
Over 5 years (as a percent)	3.28%	3.45%
Weighted average interest rate of total advances from the FHLB (as a percent)	2.26%	2.30%