Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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.

	March 31, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	3,823,953	$	—	$	3,823,953
Mortgage loans held for sale	—		122,333		—		122,333
Derivative instruments	—		34,172		—		34,172
Total	$	—	$	3,980,458	$	—	$	3,980,458
Liabilities
Derivative instruments	$	—	$	27,068	$	—	$	27,068
Total	$	—	$	27,068	$	—	$	27,068
	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

Gains and Losses Included in Earnings Related to Asset and Liabilities Measured at Fair Value on Recurring Basis

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.

	March 31, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Loans	$	—	$	—	$	87,425	$	87,425
OREO, net	—		—		2,122		2,122
Total	$	—	$	—	$	89,547	$	89,547
	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:

	March 31, 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	$	122,333	$	118,875	$	3,458	$	157,041	$	153,801	$	3,240