Derivative Instruments - Narrative (Details) $ in Thousands	1 Months Ended
	Aug. 31, 2020 USD ($)	Jul. 31, 2020 USD ($) derivative_instrument	May 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2014 USD ($) derivative_instrument	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2012 USD ($) derivative_instrument
Interest rate contracts with corporate customers
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount						$ 272,136
Offsetting interest rate contracts with other financial institutions
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount						272,136
Interest rate swaps
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount	$ 25,000		$ 25,000	$ 100,000
Number of instruments held | derivative_instrument		2			2
Term of contract	7 years		3 years	10 years
Floating rate liability at the bank level, derivative one
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount		$ 25,000			$ 15,000
Term of contract		7 years			4 years
Floating rate liability at the bank level, derivative two
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount		$ 25,000			$ 15,000
Term of contract		5 years			5 years
Cash flow hedging
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount								$ 30,000	$ 32,000
Number of instruments held | derivative_instrument									2
Commitments to fund fixed-rate residential mortgage loans
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount						755,721	$ 215,751
Commitments to sell residential mortgage loans
Derivative Instruments (Textual) [Abstract]
Derivative, notional amount						$ 760,000	$ 414,000