Derivatives and Balance Sheet Offsetting (Tables)

12 Months Ended

Dec. 31, 2018

Derivative [Line Items]

Balance Sheet Offsetting [Table Text Block]

The following tables show the gross interest rate swap agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of cash or other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.

	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Collateral Posted			Net Amount
December 31, 2018	(in thousands)
Assets
Interest rate contracts	$	7,033	$	—	$	7,033	$	—		$	7,033
Liabilities
Interest rate contracts	$	7,033	$	—	$	7,033	$	(3,235	)	$	3,798
Repurchase agreements	$	61,094	$	—	$	61,094	$	(61,094	)	$	—
December 31, 2017
Assets
Interest rate contracts	$	6,707	$	—	$	6,707	$	—		$	6,707
Liabilities
Interest rate contracts	$	6,714	$	—	$	6,714	$	(6,714	)	$	—
Repurchase agreements	$	79,059	$	—	$	79,059	$	(79,059	)	$	—

Not Designated as Hedging Instrument [Member]

Derivative [Line Items]

Schedule of Fair Value Derivative Instruments

The following table presents the fair value and balance sheet classification of derivatives not designated as hedging instruments at December 31, 2018 and 2017:

	Asset Derivatives						Liability Derivatives
	2018			2017			2018			2017
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
		(in thousands)
Interest rate contracts	Other assets	$	7,033	Other assets	$	6,707	Other liabilities	$	7,033	Other liabilities	$	6,714

Available-for-sale Securities [Member]

Derivative [Line Items]

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:

	Remaining contractual maturity of the agreements
	Overnight and continuous		Up to 30 days		30 - 90 days		Greater than 90 days		Total
December 31, 2018	(in thousands)
Class of collateral pledged for repurchase agreements
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	61,094	$	—	$	—	$	—	$	61,094
Gross amount of recognized liabilities for repurchase agreements									61,094
Amounts related to agreements not included in offsetting disclosure									$	—