Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Financial Asset and Liabilities Measured at Fair Value on Recurring Basis

The Company has segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to estimate the fair value at the measurement date in the tables below. See Note 1, Summary of Significant Accounting Policies, in the Annual Report on Form 10-K for the year ended December 31, 2016, for a description of how fair value measurements are determined.

	September 30, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	4,736,339	$	—	$	4,736,339
Mortgage loans held for sale	—		141,218		—		141,218
Derivative instruments	—		31,779		—		31,779
Total	$	—	$	4,909,336	$	—	$	4,909,336
Liabilities
Derivative instruments	$	—	$	28,453	$	—	$	28,453
Total	$	—	$	28,453	$	—	$	28,453
	December 31, 2016
	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	3,446,097	$	—	$	3,446,097
Mortgage loans held for sale	—		157,041		—		157,041
Derivative instruments	—		38,886		—		38,886
Total	$	—	$	3,642,024	$	—	$	3,642,024
Liabilities
Derivative instruments	$	—	$	30,209	$	—	$	30,209
Total	$	—	$	30,209	$	—	$	30,209

Financial Asset and Liabilities Measured at Fair Value on Nonrecurring Basis

The Company has segregated all assets and liabilities that are measured at fair value on a non-recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below.

	September 30, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Loans	$	—	$	—	$	65,347	$	65,347
OREO, net	—		—		2,304		2,304
Total	$	—	$	—	$	67,651	$	67,651
	December 31, 2016
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Loans	$	—	$	—	$	93,485	$	93,485
OREO, net	—		—		185		185
Total	$	—	$	—	$	93,670	$	93,670

Summary of Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance for Mortgage Loans Held for Sale

The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for mortgage loans held for sale measured at fair value:

	September 30, 2017						December 31, 2016
(Dollars in thousands)	Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal		Aggregate Fair Value		Aggregate Unpaid Principal		Aggregate Fair Value Less Unpaid Principal
Mortgage loans held for sale, at fair value	$	141,218	$	137,564	$	3,654	$	157,041	$	153,801	$	3,240