Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

FHLBB Advances Maturity Summary

The following table presents scheduled maturities and weighted average interest rates on FHLB advances outstanding as of December 31, 2017:

(Dollars in thousands)	Scheduled Maturity		Weighted Average Rate
2018		$465,634	1.51	%
2019	137,258		1.62
2020	67,033		1.95
2021	51,222		2.43
2022	55,447		3.58
2023 and thereafter	14,762		2.44
Total		$791,356	1.85	%

Schedule of Short-Term FHLBB Advances

The following table presents certain information concerning short-term FHLB advances:

(Dollars in thousands)
As of and for the years ended December 31,	2017			2016			2015
Average amount outstanding during the period		$351,692			$275,533			$155,874
Amount outstanding at end of period		$367,500			$352,500			$107,500
Highest month end balance during period		$417,500			$367,500			$229,500
Weighted-average interest rate at end of period	1.57		%	0.79		%	0.55		%
Weighted-average interest rate during the period	1.20		%	0.73		%	0.38		%