Derivative Instruments and Other Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Outstanding Derivative Instruments

Information pertaining to outstanding derivative instruments is as follows:

	Balance Sheet Location	Derivative Assets - Fair Value				Balance Sheet Location	Derivative Liabilities - Fair Value
(Dollars in thousands)		December 31, 2017		December 31, 2016			December 31, 2017		December 31, 2016
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	—	$	—	Other liabilities	$	—	$	525
Total derivatives designated as hedging instruments under ASC Topic 815		$	—	$	—		$	—	$	525
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts	Other assets	$	20,446	$	20,719	Other liabilities	$	16,191	$	20,719
Foreign exchange contracts	Other assets	7		27		Other liabilities	7		26
Forward sales contracts	Other assets	136		6,014		Other liabilities	279		794
Written and purchased options	Other assets	10,654		12,125		Other liabilities	8,656		8,098
Other contracts	Other assets	22		1		Other liabilities	21		47
Total derivatives not designated as hedging instruments under ASC Topic 815		$	31,265	$	38,886		$	25,154	$	29,684
Total		$	31,265	$	38,886		$	25,154	$	30,209

	Derivative Assets - Notional Amount				Derivative Liabilities - Notional Amount
(Dollars in thousands)	December 31, 2017		December 31, 2016		December 31, 2017		December 31, 2016
Derivatives designated as hedging instruments under ASC Topic 815:
Interest rate contracts	$	—	$	—	$	108,500	$	108,500
Total derivatives designated as hedging instruments under ASC Topic 815	$	—	$	—	$	108,500	$	108,500
Derivatives not designated as hedging instruments under ASC Topic 815:
Interest rate contracts	$	1,218,464	$	1,033,955	$	1,218,464	$	1,033,955
Foreign exchange contracts	268		4,474		268		4,474
Forward sales contracts	82,347		229,181		142,578		120,567
Written and purchased options	278,638		289,115		165,198		154,170
Other contracts	29,755		8,784		86,744		106,518
Total derivatives not designated as hedging instruments under ASC Topic 815	$	1,609,472	$	1,565,509	$	1,613,252	$	1,419,684
Total	$	1,609,472	$	1,565,509	$	1,721,752	$	1,528,184

Offsetting Assets

The following table reconciles the gross amounts presented in the consolidated balance sheets to the net amounts that would result in the event of offset.

	December 31, 2017
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet						Net
(Dollars in thousands)			Derivatives			Collateral  (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts not designated as hedging instruments	$	20,446	$	(12,469	)	$	—		$	7,977
Written and purchased options	8,610		—			—			8,610
Total derivative assets subject to master netting arrangements	$	29,056	$	(12,469	)	$	—		$	16,587
Derivative liabilities
Interest rate contracts designated as hedging instruments	$	—	$	—		$	—		$	—
Interest rate contracts not designated as hedging instruments	16,191		(12,469		)	(552		)	3,170
Total derivative liabilities subject to master netting arrangements	$	16,191	$	(12,469	)	$	(552	)	$	3,170

^{(1)  Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.} 

	December 31, 2016
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet						Net
(Dollars in thousands)			Derivatives			Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts not designated as hedging instruments	$	20,719	$	(9,677	)	$	—		$	11,042
Written and purchased options	8,085		—			—			8,085
Total derivative assets subject to master netting arrangements	$	28,804	$	(9,677	)	$	—		$	19,127
Derivative liabilities
Interest rate contracts designated as hedging instruments	$	525	$	—		$	(181	)	$	344
Interest rate contracts not designated as hedging instruments	20,719		(9,677		)	(1,711		)	9,331
Total derivative liabilities subject to master netting arrangements	$	21,244	$	(9,677	)	$	(1,892	)	$	9,675

^{(1)  Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.}

Offsetting Liabilities

The following table reconciles the gross amounts presented in the consolidated balance sheets to the net amounts that would result in the event of offset.

	December 31, 2017
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet						Net
(Dollars in thousands)			Derivatives			Collateral  (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts not designated as hedging instruments	$	20,446	$	(12,469	)	$	—		$	7,977
Written and purchased options	8,610		—			—			8,610
Total derivative assets subject to master netting arrangements	$	29,056	$	(12,469	)	$	—		$	16,587
Derivative liabilities
Interest rate contracts designated as hedging instruments	$	—	$	—		$	—		$	—
Interest rate contracts not designated as hedging instruments	16,191		(12,469		)	(552		)	3,170
Total derivative liabilities subject to master netting arrangements	$	16,191	$	(12,469	)	$	(552	)	$	3,170

^{(1)  Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.} 

	December 31, 2016
	Gross Amounts Presented in the Balance Sheet		Gross Amounts Not Offset in the Balance Sheet						Net
(Dollars in thousands)			Derivatives			Collateral (1)
Derivatives subject to master netting arrangements
Derivative assets
Interest rate contracts not designated as hedging instruments	$	20,719	$	(9,677	)	$	—		$	11,042
Written and purchased options	8,085		—			—			8,085
Total derivative assets subject to master netting arrangements	$	28,804	$	(9,677	)	$	—		$	19,127
Derivative liabilities
Interest rate contracts designated as hedging instruments	$	525	$	—		$	(181	)	$	344
Interest rate contracts not designated as hedging instruments	20,719		(9,677		)	(1,711		)	9,331
Total derivative liabilities subject to master netting arrangements	$	21,244	$	(9,677	)	$	(1,892	)	$	9,675

^{(1)  Consists of cash collateral recorded at cost, which approximates fair value, and investment securities.}

Effect of Derivatives on the Consolidated Financial Statements

At December 31, 2017, 2016, and 2015, and for the years then ended, information pertaining to the effect of the hedging instruments on the consolidated financial statements is as follows:

																		Location of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
			Amount of Gain (Loss) Recognized in OCI net of taxes (Effective Portion)							Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain (Loss) Reclassified from Accumulated OCI into Income net of taxes (Effective Portion)
(Dollars in thousands)
			For the Years Ended December 31
Derivatives in ASC Topic 815 Cash Flow Hedging Relationships			2017		2016			2015				2017		2016		2015			2017		2016		2015
	Interest rate contracts	$	(611	)	$	(328	)	$	38	Interest expense	$	(390	)	$	50	$	—	Interest expense	$	—	$	—	$	—
Total		$	(611	)	$	(328	)	$	38		$	(390	)	$	50	$	—		$	—	$	—	$	—

Information pertaining to the effect of derivatives not designated as hedging instruments on the consolidated financial statements as of December 31, is as follows:

	Location of Gain (Loss) Recognized in  Income on Derivatives	Amount of Gain (Loss) Recognized in Income on Derivatives
(Dollars in thousands)		2017			2016			2015
Interest rate contracts (1)	Other income	$	4,750		$	8,830		$	4,143
Foreign exchange contracts	Other income	43			15			22
Forward sales contracts	Mortgage income	(4,115		)	(1,731		)	(2,947		)
Written and purchased options	Mortgage income	(2,028		)	(327		)	274
Other contracts	Other income	51			17			—
Total		$	(1,299	)	$	6,804		$	1,492