Fair Value Accounting and Measurement (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial Assets And Liabilities Accounted For Fair Value On Recurring Basis

The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at December 31, 2015 and 2014 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

	Fair value  at December 31, 2015		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
	(in thousands)
Assets
Securities available for sale
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,286,489	$	—	$	1,286,489	$	—
State and municipal securities	492,169		—		492,169		—
U.S. government agency and government-sponsored enterprise securities	353,782		—		353,782		—
U.S. government securities	20,137		20,137		—		—
Other securities	5,117		—		5,117		—
Total securities available for sale	$	2,157,694	$	20,137	$	2,137,557	$	—
Other assets (Interest rate contracts)	$	12,438	$	—	$	12,438	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	12,478	$	—	$	12,478	$	—

	Fair value  at December 31, 2014		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
	(in thousands)
Assets
Securities available for sale
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,162,387	$	—	$	1,162,387	$	—
State and municipal debt securities	496,484		—		496,484		—
U.S. government agency and government-sponsored enterprise securities	413,706		—		413,706		—
U.S. government securities	20,499		20,499		—		—
Other securities	5,181		—		5,181		—
Total securities available for sale	$	2,098,257	$	20,499	$	2,077,758	$	—
Other assets (Interest rate contracts)	$	11,800	$	—	$	11,800	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	11,851	$	—	$	11,851	$	—

Financial Assets Accounted For Fair Value On Nonrecurring Basis

The following table sets forth the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the years ended December 31, 2015 and 2014:

	Fair value  at December 31, 2015		Fair Value Measurements at Reporting Date Using						Losses During the Year Ended December 31, 2015
			Level 1		Level 2		Level 3
	(in thousands)
Impaired loans	$	758	$	—	$	—	$	758	$	653
OREO	4,524		—		—		4,524		949
	$	5,282	$	—	$	—	$	5,282	$	1,602

	Fair value  at December 31, 2014		Fair Value Measurements at Reporting Date Using						Losses During the Year Ended December 31, 2014
			Level 1		Level 2		Level 3
	(in thousands)
OREO	$	5,365	$	—	$	—	$	5,365	$	1,008
	$	5,365	$	—	$	—	$	5,365	$	1,008

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets during 2015 and 2014, along with the valuation techniques used, are shown in the following tables:

	Fair value  at December 31, 2015		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
Impaired loans - real estate collateral	$	380	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
Impaired loans - other collateral (3)	378		Fair Market Value of Collateral	Adjustment to Stated Value	N/A (2)
OREO	4,524		Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of equipment and life insurance).
(2) Quantitative disclosures are not provided because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of equipment and life insurance.

	Fair value  at December 31, 2014		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
OREO	$	5,365	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal value during the current period.

Fair Value, by Balance Sheet Grouping

The following tables summarize carrying amounts and estimated fair values of selected financial instruments for the periods indicated:

	December 31, 2015
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	166,929	$	166,929	$	166,929	$	—	$	—
Interest-earning deposits with banks	8,373		8,373		8,373		—		—
Securities available for sale	2,157,694		2,157,694		20,137		2,137,557		—
FHLB stock	12,722		12,722		—		12,722		—
Loans held for sale	4,509		4,509		—		4,509		—
Loans	5,746,855		5,752,423		—		—		5,752,423
FDIC loss-sharing asset	6,568		921		—		—		921
Interest rate contracts	12,438		12,438		—		12,438		—
Liabilities
Deposits	$	7,438,829	$	7,434,787	$	6,979,924	$	454,863	$	—
FHLB advances	68,531		69,176		—		69,176		—
Repurchase agreements	99,699		100,346		—		100,346		—
Interest rate contracts	12,478		12,478		—		12,478		—

	December 31, 2014
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	171,221	$	171,221	$	171,221	$	—	$	—
Interest-earning deposits with banks	16,949		16,949		16,949		—		—
Securities available for sale	2,098,257		2,098,257		20,499		2,077,758		—
FHLB stock	33,365		33,365		—		33,365		—
Loans held for sale	1,116		1,116		—		1,116		—
Loans	5,375,809		5,516,286		—		—		5,516,286
FDIC loss-sharing asset	15,174		4,054		—		—		4,054
Interest rate contracts	11,800		11,800		—		11,800		—
Liabilities
Deposits	$	6,924,722	$	6,921,804	$	6,416,017	$	505,787	$	—
FHLB advances	216,568		217,296		—		217,296		—
Repurchase agreements	105,080		106,171		—		106,171		—
Other borrowings	8,248		8,248		—		8,248		—
Interest rate contracts	11,851		11,851		—		11,851		—