FAIR VALUE MEASUREMENTS

Recurring fair value measurements

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 2015 Annual Report on Form 10-K for the year ended December 31, 2015, for a description of how fair value measurements are determined.



	March 31, 2016
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	2,755,425	$	—	$	2,755,425
Mortgage loans held for sale	—		192,545		—		192,545
Derivative instruments	—		48,594		—		48,594
Total	$	—	$	2,996,564	$	—	$	2,996,564
Liabilities
Derivative instruments	$	—	$	48,772	$	—	$	48,772
Total	$	—	$	48,772	$	—	$	48,772



	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
Securities available for sale	$	—	$	2,800,286	$	—	$	2,800,286
Mortgage loans held for sale	—		166,247		—		166,247
Derivative instruments	—		30,486		—		30,486
Total	$	—	$	2,997,019	$	—	$	2,997,019
Liabilities
Derivative instruments	$	—	$	24,939	$	—	$	24,939
Total	$	—	$	24,939	$	—	$	24,939

During the three months ended March 31, 2016 there were no transfers between the Level 1 and Level 2 fair value categories.

Gains and losses (realized and unrealized) included in earnings (or accumulated other comprehensive income) during the first three months of 2016 related to assets and liabilities measured at fair value on a recurring basis are reported in non-interest income or other comprehensive income as follows:



(Dollars in thousands)	Non-interest income		Other comprehensive income
Net gains included in earnings	$	4,103	$	—
Change in unrealized net gains relating to assets still held at March 31, 2016	—		21,193

Non-recurring fair value measurements

The Company has segregated all financial 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, 2016
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	2,051	$	—	$	2,051
Total	$	—	$	2,051	$	—	$	2,051



	December 31, 2015
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets
OREO, net	$	—	$	1,106	$	—	$	1,106
Total	$	—	$	1,106	$	—	$	1,106

The tables above exclude the initial measurement of assets and liabilities that were acquired as part of the acquisitions completed in 2015. These assets and liabilities were recorded at their fair value upon acquisition in accordance with U.S. GAAP and were not re-measured during the periods presented unless specifically required by U.S. GAAP. Acquisition date fair values represent either Level 2 fair value measurements (investment securities, OREO, property, equipment, and debt) or Level 3 fair value measurements (loans, deposits, and core deposit intangible asset).

The Company did not record any liabilities at fair value for which measurement of the fair value was made on a non-recurring basis at March 31, 2016 and December 31, 2015.

Fair value option

The Company has elected the fair value option for certain originated residential mortgage loans held for sale, which allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to hedge them without the burden of complying with the requirements for hedge accounting.

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, 2016						December 31, 2015
(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	$	192,545	$	185,483	$	7,062	$	166,247	$	161,083	$	5,164

Interest income on mortgage loans held for sale is recognized based on contractual rates and is reflected in interest income on loans held for sale in the consolidated statements of comprehensive income. Net gains resulting from the change in fair value of these loans that were recorded in mortgage income in the consolidated statements of comprehensive income totaled $1.9 million for both the three months ended March 31, 2016 and 2015. The changes in fair value are mostly offset by economic hedging activities, with an immaterial portion of these changes attributable to changes in instrument-specific credit risk.