Derivatives and Hedging Activities (Textual) (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Derivative [Line Items]
Interest Receivable		$ 25,900,000
Derivative, Net Liability Position, Aggregate Fair Value		$ 88,300,000			$ 26,000,000.0
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge		4 years 7 months 6 days
Gain (Loss) on Sales of Loans, Net		$ 4,500,000	$ 705,000
Exposure to Institutional Counterparties		57,300,000			25,400,000
Amortization Of Deferred Hedge Gains Losses		0
Customer related positions		143,700,000			51,000,000.0
Fair Value Hedges, Net		0			0
Change in Fair Value on Loans Held for Sale		(914,000)	$ 1,000	$ 1,000
Interest rate swaps
Derivative [Line Items]
Interest Receivable	[1],[2]	574,000			350,000
Derivative, Notional Amount		1,025,000,000			925,000,000
Interest Payable, Current	[1],[2]	$ 14,000			$ 4,000
Interest rate collars on loans [Member]
Derivative [Line Items]
Derivative, Average Cap Interest Rate		2.73%			3.02%
Derivative, Average Floor Interest Rate		2.20%			2.51%
Derivative, Notional Amount		$ 400,000,000			$ 400,000,000
Loan level swaps
Derivative [Line Items]
Interest Receivable	[1],[2]	1,100,000			569,000
Interest Payable, Current	[1],[2]	1,100,000			$ 569,000
Interest Income [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		(16,800,000)
Interest Expense [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ 587,000

[1] All asset derivatives are located in other assets on the balance sheet.

[2] Approximately $574,000 and $1.1 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of March 31, 2020. Accrued interest receivable of approximately and $350,000 and $569,000 was excluded from the fair value of the interest rate and loan level asset derivatives, respectively, as of December 31, 2019.