Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 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 September 30, 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	$	784,475	$	—	$	784,475	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	1,154,894		—		1,154,894		—
Private mortgage-backed securities	437		—		437		—
Mortgage servicing rights	24,944		—		24,944		—

			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 September 30, 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	$	53,327	$	—	$	—	$	53,327
Other real estate owned	5,344		—		—		5,344
Long-lived assets to be disposed of by sale	1,327		—		—		1,327
			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 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 September 30, 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	$	542,343	$	542,343	$	—	$	542,343	$	—
Investment securities available-for-sale	1,939,806		1,939,806		—		1,939,806		—
Investment securities held-to-maturity	205,277		208,482		—		208,482		—
Accrued interest receivable	30,384		30,384		—		30,384		—
Mortgage servicing rights, net	13,518		24,944		—		24,944		—
Net loans	4,239,102		4,192,135		—		4,138,808		53,327
Total financial assets	$	6,970,430	$	6,938,094	$	—	$	6,884,767	$	53,327
Financial liabilities:
Total deposits, excluding time deposits	$	4,870,793	$	4,870,793	$	—	$	4,870,793	$	—
Time deposits	1,237,832		1,244,919		—		1,244,919		—
Securities sold under repurchase agreements	428,110		428,110		—		428,110		—
Other borrowed funds	10		10		—		10		—
Accrued interest payable	5,367		5,367		—		5,367		—
Long-term debt	37,128		34,712		—		34,712		—
Subordinated debentures held by subsidiary    trusts	82,477		70,727		—		70,727		—
Total financial liabilities	$	6,661,717	$	6,654,638	$	—	$	6,654,638	$	—

					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	$	—