Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2020	Dec. 31, 2018
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amount of Gain or (Loss) Recognized in OCI on Derivative		$ (2,886)	$ 0
Securities Sold under Agreements to Repurchase [Abstract]
Gross Amounts Recognized	$ 162,920	162,920			$ 221,450
Gross Amounts Offset in the Statement of Financial Position	0	0			0
Net Amounts of Liabilities presented in the Statement of Financial Position	162,920	162,920			221,450
Financial Instruments	0	0			0
Fair Value Collateral Posted	162,920	162,920			221,450
Net Amount	0	0			0
Fair value of derivatives in a net liability position	18,500	18,500
Posted collateral	17,800	17,800
Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Asset derivatives (other assets), fair value	13,561	13,561			2,217
Liability derivatives (other liabilities), fair value	18,451	18,451			2,217
Derivative Asset [Abstract]
Gross Amounts Offset in the Statement of Financial Position	0	0			0
Derivative financial instruments	13,561	13,561			2,217
Financial Instruments	22	22			0
Fair Value Collateral Posted	0	0			0
Net Amount	13,539	13,539			2,217
Derivative Liability [Abstract]
Gross Amounts Offset in the Statement of Financial Position	0	0			0
Net Amounts of Liabilities presented in the Statement of Financial Position	18,451	18,451			2,217
Financial Instruments	22	22			0
Fair Value Collateral Posted	17,785	17,785			0
Net Amount	644	644			2,217
Derivatives Designated as Hedging Instruments
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Asset derivatives (other assets), fair value	0	0			0
Liability derivatives (other liabilities), fair value	3,785	3,785			0
Derivatives Designated as Hedging Instruments | Other Assets | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	185,886	185,886			0
Asset derivatives (other assets), fair value	0	0			0
Derivatives Designated as Hedging Instruments | Other Liabilities | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value	3,785	3,785			0
Derivatives not Designated as Hedging Instruments
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Asset derivatives (other assets), fair value	13,561	13,561			3,023
Liability derivatives (other liabilities), fair value	14,666	14,666			3,023
Derivatives not Designated as Hedging Instruments | Other Assets | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	628,864	628,864			494,567
Asset derivatives (other assets), fair value	13,561	13,561			2,217
Derivatives not Designated as Hedging Instruments | Other Assets | Foreign exchange forward contracts
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	0	0			806
Asset derivatives (other assets), fair value	0	0			806
Derivatives not Designated as Hedging Instruments | Other Liabilities | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value	14,666	14,666			2,217
Derivatives not Designated as Hedging Instruments | Other Liabilities | Foreign exchange forward contracts
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value	$ 0	$ 0			$ 806
Cash Flow Hedging
Derivative [Line Items]
Derivative, fixed rate	2.62%	2.62%
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	$ (42)	$ (48)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amount of Gain or (Loss) Recognized in OCI on Derivative	(846)	(3,785)
Cash Flow Hedging | Interest rate swap
Derivative [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	(42)	(48)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amount of Gain or (Loss) Recognized in OCI on Derivative	$ (846)	$ (3,785)
Maximum | Cash Flow Hedging
Derivative [Line Items]
Cash flow hedge term		6 years
Scenario, Forecast | Cash Flow Hedging
Derivative [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income				$ 500