The carrying amount and estimated fair values, as well as the level within the fair value hierarchy, of the Company’s financial instruments are included in the tables below. See Note 1, Summary of Significant Accounting Policies, for a description of how fair value measurements are determined, except for loans, amended upon implementation of ASU 2016-01, Financial Statements - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 2, Recent Accounting Pronouncements, in this Report for a description of how the fair value measurement is determined for loans beginning January 1, 2018.



		December 31, 2018
(Dollars in thousands)		Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Measurement Category
Fair Value
	Financial Assets
	Securities available for sale	$	4,783,579	$	4,783,579	$	—	$	4,783,579	$	—
	Mortgage loans held for sale	107,734		107,734		—		107,734		—
	Mortgage loans held for investment, at fair value option	3,143		3,143		—		—		3,143
	Derivative instruments	27,048		27,048		—		27,048		—

	Financial Liabilities
	Derivative instruments	22,124		22,124		—		22,124		—

Amortized Cost
	Financial Assets
	Cash and cash equivalents	$	690,453	$	690,453	$	690,453	$	—	$	—
	Securities held to maturity	207,446		204,277		—		204,277		—
	Loans and leases, carried at amortized cost, net of unearned income and allowance for loan and lease losses	22,376,101		22,088,236		—		—		22,088,236

	Financial Liabilities
	Deposits	23,763,431		23,752,139		—		23,752,139		—
	Short-term borrowings	1,482,882		1,482,882		315,882		1,167,000		—
	Long-term debt	1,166,151		1,154,062		—		—		1,154,062



		December 31, 2017
(Dollars in thousands)		Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Measurement Category
Fair Value
	Financial Assets
	Securities available for sale	$	4,590,062	$	4,590,062	$	—	$	4,590,062	$	—
	Mortgage loans held for sale	134,916		134,916		—		134,916		—
	Mortgage loans held for investment, at fair value option	14,953		14,953		—		—		14,953
	Derivative instruments	31,265		31,265		—		31,265		—

	Financial Liabilities
	Derivative instruments	25,154		25,154		—		25,154		—

Amortized Cost
	Financial Assets
	Cash and cash equivalents	$	625,724	$	625,724	$	625,724	$	—	$	—
	Securities held to maturity	227,318		227,964		—		227,964		—
	Loans and leases, carried at amortized cost, net of unearned income and allowance for loan and lease losses	19,922,337		19,811,904		—		—		19,811,904

	Financial Liabilities
	Deposits	21,466,717		21,460,782		—		21,460,782		—
	Short-term borrowings	991,297		991,297		516,297		475,000		—
	Long-term debt	1,495,835		1,476,899		—		—		1,476,899