Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Financial Asset and Liabilities Measured at Fair Value on Recurring Basis

	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

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

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

Financial Asset and Liabilities Measured at Fair Value on Nonrecurring Basis

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

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, 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