Derivative Financial Instruments - Carrying Amount and Adjustment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized cost, at fair value		$ 590,046	$ 546,640
Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized cost, at fair value		88,200
Loans | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the hedged assets		0	474,957
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets	$ 21,440	0
Securities available-for-sale | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the hedged assets		145,872	$ 151,538
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets	$ 2,802	$ 7,095