Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative Asset	[1]	$ 219,420	$ 78,385
Derivative Liability	[2]	139,426	53,923
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]	160,613	53,503
Derivative, Collateral, Obligation to Return Securities	[1],[3]	58,807	24,882
Derivative, Collateral, Right to Reclaim Securities	[2],[3]	58,807	24,882
Derivative, Collateral, Obligation to Return Cash	[1]	0	0
Derivative, Collateral, Right to Reclaim Cash	[2]	76,733	25,493
Derivative Liability, Fair Value, Amount Offset Against Collateral	[2]	3,886	3,548
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	[1]	160,324	55,245
Derivative Asset, Fair Value, Gross Asset	[1]	219,130	78,385
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	[2]	156,186	53,726
Liability Derivatives	[2]	158,469	53,923
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Assets, at Fair Value	[1],[4]	58,806	23,140
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	[2],[5]	2,283	197
Loan level swaps [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1],[4]	153,347	52,374
Loan level swaps [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	[2],[5]	153,351	52,369
Foreign exchange contracts | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	1,542	1,191
Foreign exchange contracts | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	[2]	1,498	1,149
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Asset at Fair Value	[1]	5,435	1,680
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Asset at Fair Value	[1]	0	0
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Asset at Fair Value	[1]	0	0
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Liabilities at Fair Value	[2]	0	0
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Liabilities at Fair Value	[2]	572	12
Derivative Instrument Not Designated as a Hedge, Forward Sale Hedge Commitment, Liability at Fair Value	[2]	765	196
CME [Member]
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Obligation to Return Cash	[1],[6]	(290)	0
Derivative, Collateral, Right to Reclaim Cash	[2],[6]	$ 19,043	$ 0

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

[2] All liability derivatives are located in other liabilities on the balance sheet.

[3] Reflects offsetting derivative positions with the same counterparty that are not netted on the balance sheet.

[4] Approximately $1.1 million and $1.9 million of accrued interest receivable is included in the fair value of the interest rate and loan level asset derivatives, respectively, as of June 30, 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.

[5] Approximately $177,000 of accrued interest receivable is included in the fair value of interest rate derivative liabilities as of June 30, 2020. Approximately $2.0 million of accrued interest payable is included in the fair value of the loan level derivative liabilities as of June 30, 2020. Accrued interest payable of approximately $4,000 and $569,000 was excluded from the fair value of the interest rate and loan level derivative liabilities, respectively, as of December 31, 2019.

[6] Netting adjustments represent the amounts recorded to convert derivative assets and liabilities cleared through CME from a gross basis to a net basis, inclusive of the variation margin payments, in accordance with applicable accounting guidance. As displayed in the table above, derivatives that cleared through the CME were either in a net asset position or a net liability position as of June 30, 2020.