Derivatives and Hedging Activities (Textual) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 42,200,000		$ 42,200,000		$ 176,000
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge			4 years 7 months 6 days
Gain (Loss) on Sales of Loans, Net	5,500,000	$ 1,100,000	$ 9,500,000	$ 2,600,000
Exposure to Institutional Counterparties	30,000,000.0		30,000,000.0		18,400,000
Amortization Of Deferred Hedge Gains Losses	0	61,000	0	183,000
Customer related positions	71,700,000		71,700,000		6,400,000
Notional amount of fair value hedged derivative	0		0		$ 0
Change in Fair Value on Loans Held for Sale	$ 272,000	$ 103,000	$ 1,192,000	$ 147,000
Interest rate collars on loans [Member]
Derivative [Line Items]
Derivative, Average Cap Interest Rate	2.87%		2.87%		3.02%
Derivative, Average Floor Interest Rate	2.32%		2.32%		2.51%
Derivative, Notional Amount	$ 350,000,000		$ 350,000,000		$ 250,000,000
Interest Income [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	5,800,000
Interest Expense [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 201,000