Fair Value of Assets and Liabilities (FV on recurring or nonrecurring basis-level 3 inputs) (Details 3) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Interest Rate Lock Commitments | Pricing Model
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 3,930	$ 1,280
Interest Rate Swap Agreements | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	76,750	21,293
Mortgage Servicing Rights | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Mortgage Servicing Rights, at Fair Value	$ 22,537	$ 26,840
Significant Other Unobservable Inputs (Level 3) | Interest Rate Lock Commitments | Pricing Model | Weighted Average Closing Ratio (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Fair Value Inputs	0.8746	0.9224
Significant Other Unobservable Inputs (Level 3) | Interest Rate Swap Agreements | Discounted Cash Flow | Weighted Average Credit Factor (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Fair Value Inputs	0.0019	0.0020
Significant Other Unobservable Inputs (Level 3) | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average Constant Prepayment Rate (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Mortgage Servicing Rights, Fair Value Inputs	0.1493	0.1076
Significant Other Unobservable Inputs (Level 3) | Weighted Average Discount Rate (as a percent) | Discounted Cash Flow | Weighted Average Discount Rate (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Mortgage Servicing Rights, Fair Value Inputs	0.0590	0.0733
Minimum | Significant Other Unobservable Inputs (Level 3) | Discounted Cash Flow | Weighted Average Discount Rate (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Mortgage Servicing Rights, Fair Value Inputs	0.0588
Minimum | Significant Other Unobservable Inputs (Level 3) | Interest Rate Lock Commitments | Pricing Model | Weighted Average Closing Ratio (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Fair Value Inputs	0.7540
Minimum | Significant Other Unobservable Inputs (Level 3) | Interest Rate Swap Agreements | Discounted Cash Flow | Weighted Average Credit Factor (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Fair Value Inputs	0.0002
Minimum | Mortgage Servicing Rights [Member] | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Discount Rate	9.57%
Maximum | Significant Other Unobservable Inputs (Level 3) | Discounted Cash Flow | Weighted Average Discount Rate (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Mortgage Servicing Rights, Fair Value Inputs	0.0644
Maximum | Significant Other Unobservable Inputs (Level 3) | Interest Rate Lock Commitments | Pricing Model | Weighted Average Closing Ratio (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Fair Value Inputs	0.9900
Maximum | Significant Other Unobservable Inputs (Level 3) | Interest Rate Swap Agreements | Discounted Cash Flow | Weighted Average Credit Factor (as a percent)
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Fair Value Inputs	0.0061
Maximum | Mortgage Servicing Rights [Member] | Discounted Cash Flow
Level 3 Assets and Liabilities, Fair Value and Fair Value Unobservable Inputs
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Discount Rate	16.76%