Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of March 31, 2013	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	779,922	$	—	$	779,922	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	1,230,738		—		1,230,738		—
Private mortgage-backed securities	509		—		509		—
Mortgage servicing rights	18,807		—		18,807		—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2012	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	754,856	$	—	$	754,856	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	1,239,851		—		1,239,851		—
Private mortgage-backed securities	551		—		551		—
Mortgage servicing rights	16,373		—		16,373		—

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis

The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis.

			Fair Value Measurements at Reporting Date Using
As of March 31, 2013	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	77,089	$	—	$	—	$	77,089
Other real estate owned	14,372		—		—		14,372
Long-lived assets to be disposed of by sale	496		—		—		496
			Fair Value Measurements at Reporting Date Using
As of December 31, 2012	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	74,623	$	—	$	—	$	74,623
Other real estate owned	15,745		—		—		15,745
Long-lived assets to be disposed of by sale	496		—		—		496

Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs

The estimated fair values of financial instruments that are reported at amortized cost in the Company's consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of March 31, 2013	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	498,543	$	498,543	$	—	$	498,543	$	—
Investment securities available-for-sale	2,011,169		2,011,169		—		2,011,169		—
Investment securities held-to-maturity	210,426		220,115		—		220,115		—
Accrued interest receivable	29,375		29,375		—		29,375		—
Mortgage servicing rights, net	13,006		18,807		—		18,807		—
Net loans	4,126,655		4,139,777		—		4,062,688		77,089
Total financial assets	$	6,889,174	$	6,917,786	$	—	$	6,840,697	$	77,089
Financial liabilities:
Total deposits, excluding time deposits	$	4,684,664	$	4,684,664	$	—	$	4,684,664	$	—
Time deposits	1,343,681		1,351,742		—		1,351,742		—
Securities sold under repurchase agreements	467,205		467,205		—		467,205		—
Other borrowed funds	8		8		—		8		—
Accrued interest payable	6,433		6,433		—		6,433		—
Long-term debt	37,150		34,887		—		34,887		—
Subordinated debentures held by subsidiary    trusts	82,477		66,080		—		66,080		—
Total financial liabilities	$	6,621,618	$	6,611,019	$	—	$	6,611,019	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2012	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	801,332	$	801,332	$	—	$	801,332	$	—
Investment securities available-for-sale	1,995,258		1,995,258		—		1,995,258		—
Investment securities held-to-maturity	208,223		218,933		—		218,933		—
Accrued interest receivable	28,869		28,869		—		28,869		—
Mortgage servicing rights, net	12,653		16,373		—		16,373		—
Net loans	4,123,401		4,142,426		—		4,067,803		74,623
Total financial assets	$	7,169,736	$	7,203,191	$	—	$	7,128,568	$	74,623
Financial liabilities:
Total deposits, excluding time deposits	$	4,854,927	$	4,854,927	$	—	$	4,854,927	$	—
Time deposits	1,385,484		1,394,403		—		1,394,403		—
Securities sold under repurchase agreements	505,785		505,785		—		505,785		—
Other borrowed funds	32		32		—		32		—
Accrued interest payable	6,502		6,502		—		6,502		—
Long-term debt	37,160		35,104		—		35,104		—
Preferred stock pending redemption	50,000		50,000				50,000
Subordinated debentures held by subsidiary    trusts	82,477		62,409		—		62,409		—
Total financial liabilities	$	6,922,367	$	6,909,162	$	—	$	6,909,162	$	—