Derivatives and Hedging Activities Cash Flow Hedges Text Description (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) swap	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Gain (loss) to be reclassified during next 12 months	$ 600,000
Derivatives designated as hedging instruments:
Derivative [Line Items]
Number of interest rate derivatives | swap	4
Derivatives designated as hedging instruments: | Bank $60m LIBOR Swap 2017 effective 3/22/17
Derivative [Line Items]
Number of interest rate derivatives | swap	1
Derivatives designated as hedging instruments: | Interest Rate Swaps 2013
Derivative [Line Items]
Number of interest rate derivatives | swap	3
Derivatives designated as hedging instruments: | Bank $25m LIBOR Swap effective 3/1/14
Derivative [Line Items]
Derivative notional amount		$ 25,000,000.0
Derivatives designated as hedging instruments: | Bank $25m LIBOR Swap 2013 effective 6/1/14
Derivative [Line Items]
Derivative notional amount		$ 25,000,000.0
Bank $60m LIBOR Swap 2017 effective 3/22/17 | Private Banking | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative, Inception Date	Mar. 22, 2017
Derivative Asset, Notional Amount	$ 60,000,000
Derivative term of contract	2 years 3 months
Derivative fixed interest rate	1.65%
Objectives for Using Derivative Instruments	These interest rate swaps will effectively fix the Bank’s interest payments on $60 million in interest-related cash outflows attributable to changes in the LIBOR component of FHLB borrowing liabilities
Bank $25m LIBOR Swap 2013 effective 6/1/14 | Private Banking | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative, Inception Date	Jun. 01, 2014
Derivative Asset, Notional Amount	$ 25,000,000
Objectives for Using Derivative Instruments	The interest rate swaps will effectively fix the Bank’s interest payments on $75 million of its LIBOR-indexed deposit liabilities
Bank $25m LIBOR Swap 2013 effective 6/1/14 | Private Banking | Minimum | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative term of contract	5 years
Derivative fixed interest rate	1.68%
Bank $25m LIBOR Swap 2013 effective 6/1/14 | Private Banking | Maximum | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative term of contract	6 years
Derivative fixed interest rate	2.03%
Bank $25m LIBOR Swap 2013 effective 6/1/14 | Private Banking | Weighted Average | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative fixed interest rate	1.82%
Bank $25m LIBOR Swap effective 3/1/14 | Private Banking | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative, Inception Date	Mar. 01, 2014
Derivative Asset, Notional Amount	$ 25,000,000
Objectives for Using Derivative Instruments	The interest rate swaps will effectively fix the Bank’s interest payments on $75 million of its LIBOR-indexed deposit liabilities
Bank $25m LIBOR Swap effective 3/1/14 | Private Banking | Minimum | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative term of contract	5 years
Derivative fixed interest rate	1.68%
Bank $25m LIBOR Swap effective 3/1/14 | Private Banking | Maximum | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative term of contract	6 years
Derivative fixed interest rate	2.03%
Bank $25m LIBOR Swap effective 3/1/14 | Private Banking | Weighted Average | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative fixed interest rate	1.82%
Bank $25m LIBOR Swap effective 8/1/13 | Private Banking | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative, Inception Date	Aug. 01, 2013
Derivative Asset, Notional Amount	$ 25,000,000
Objectives for Using Derivative Instruments	The interest rate swaps will effectively fix the Bank’s interest payments on $75 million of its LIBOR-indexed deposit liabilities
Bank $25m LIBOR Swap effective 8/1/13 | Private Banking | Minimum | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative term of contract	5 years
Derivative fixed interest rate	1.68%
Bank $25m LIBOR Swap effective 8/1/13 | Private Banking | Maximum | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative term of contract	6 years
Derivative fixed interest rate	2.03%
Bank $25m LIBOR Swap effective 8/1/13 | Private Banking | Weighted Average | Derivatives designated as hedging instruments: | Derivatives - interest rate swaps
Derivative [Line Items]
Derivative fixed interest rate	1.82%