FAIR VALUE OF ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of carrying amount and estimated fair value of financial instruments

						Fair Value Measurement Using
	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)
	(Dollars in thousands)
December 31, 2017
Financial assets:
Cash and due from financial institutions	$	75,318	$	75,318		$	75,318	$	—		$	—
Interest-bearing deposits in other financial institutions	6,975		6,975			6,975		—			—
Investment securities	1,496,644		1,494,092			825		1,481,473			11,794
Loans held for sale	16,336		16,336			—		16,336			—
Loans and leases, net of allowance for loan and lease losses	3,720,614		3,684,834			—		21,280			3,663,554
Mortgage servicing rights	15,843		17,161			—		—			17,161
Federal Home Loan Bank stock	7,761		7,761			7,761		—			—
Accrued interest receivable	16,581		16,581			16,581		—			—
Financial liabilities:
Deposits:
Noninterest-bearing deposits	1,395,556		1,395,556			1,395,556		—			—
Interest-bearing demand and savings deposits	2,414,930		2,414,930			2,414,930		—			—
Time deposits	1,145,868		1,140,064			—		—			1,140,064
Federal Home Loan Bank advances and other short-term borrowings	32,000		32,000			—		32,000			—
Long-term debt	92,785		70,139			—		70,139			—
Accrued interest payable (included in other liabilities)	3,698		3,698			3,698		—			—
Off-balance sheet financial instruments:
Commitments to extend credit	917,405		1,140			—		1,140			—
Standby letters of credit and financial guarantees written	13,551		203			—		203			—
Derivatives:
Interest rate lock commitments	2,494		12			—		12			—
Forward sale commitments	18,748		(26		)	—		(26		)	—

					Fair Value Measurement Using
	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)
	(Dollars in thousands)
December 31, 2016
Financial assets:
Cash and due from financial institutions	$	75,272	$	75,272	$	75,272	$	—	$	—
Interest-bearing deposits in other financial institutions	9,069		9,069		9,069		—		—
Investment securities	1,461,515		1,458,213		660		1,445,357		12,196
Loans held for sale	31,881		31,881		—		31,881		—
Loans and leases, net of allowance for loan and lease losses	3,468,259		3,426,976		—		30,723		3,396,253
Mortgage servicing rights	15,779		18,087		—		—		18,087
Federal Home Loan Bank stock	11,572		11,572		11,572		—		—
Accrued interest receivable	15,675		15,675		15,675		—		—
Financial liabilities:
Deposits:
Noninterest-bearing deposits	1,265,246		1,265,246		1,265,246		—		—
Interest-bearing demand and savings deposits	2,253,591		2,253,591		2,253,591		—		—
Time deposits	1,089,364		1,088,436		—		—		1,088,436
Federal Home Loan Bank advances and other short-term borrowings	135,000		135,000		—		135,000		—
Long-term debt	92,785		68,186		—		68,186		—
Accrued interest payable (included in other liabilities)	1,556		1,556		1,556		—		—
Off-balance sheet financial instruments:
Commitments to extend credit	825,304		1,046		—		1,046		—
Standby letters of credit and financial guarantees written	16,073		241		—		241		—
Derivatives:
Interest rate lock commitments	879		6		—		6		—
Forward sale commitments	32,497		136		—		136		—

Schedule of balances of assets and liabilities measured at fair value on a recurring basis

The following table below presents the the fair value of assets and liabilities measured on a recurring basis:

				Fair Value at Reporting Date Using
	Fair Value			Quoted Prices in Active  Markets for  Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
	(Dollars in thousands)
December 31, 2017
Available for sale securities:
Debt securities:
States and political subdivisions	$	179,781		$	—	$	167,987		$	11,794
Corporate securities	74,278			—		74,278			—
U.S. Treasury obligations and direct obligations of U.S Government agencies	25,510			—		25,510			—
Mortgage-backed securities:
Residential-U.S. Government sponsored entities	800,683			—		800,683			—
Residential-Non-government agencies	46,763			—		46,763			—
Commercial-U.S. Government agencies and sponsored entities	39,725			—		39,725			—
Commercial-Non-government agencies	137,326			—		137,326			—
Other	825			825		—			—
Derivatives: Interest rate lock and forward sale commitments	(14		)	—		(14		)	—
Total	$	1,304,877		$	825	$	1,292,258		$	11,794

			Fair Value at Reporting Date Using
	Fair Value		Quoted Prices in Active  Markets for  Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Dollars in thousands)
December 31, 2016
Available for sale securities:
Debt securities:
States and political subdivisions	$	185,041	$	—	$	172,845	$	12,196
Corporate securities	99,389		—		99,389		—
U.S. Treasury obligations and direct obligations of U.S Government agencies	—		—		—		—
Mortgage-backed securities:
U.S. Government sponsored entities	769,986		—		769,986		—
Non-government sponsored entities	188,771		—		188,771		—
Other	660		660		—		—
Derivatives: Interest rate lock and forward sale commitments	142		—		142		—
Total	$	1,243,989	$	660	$	1,231,133	$	12,196

Schedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basis

The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows:

	Available for Sale  Debt Securities -  States and Political  Subdivisions
	(Dollars in thousands)
Balance as of December 31, 2015	$	12,479
Principal payments received	(338		)
Purchases	—
Unrealized net loss included in other comprehensive gain	55
Balance as of December 31, 2016	$	12,196
Principal payments received	(358		)
Purchases
Unrealized net loss included in other comprehensive loss	(44		)
Balance as of December 31, 2017	$	11,794

Schedule of level of valuation assumptions used to determine the fair value of assets measured on a nonrecurring basis

:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active  Markets for  Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Losses
	(Dollars in thousands)
December 31, 2017
Impaired loans (1)	$	21,280	$	—	$	21,280	$	—	$	—
Mortgage servicing rights	17,161		—		—		17,161		—
Other real estate (2)	851		—		851		—		—
Total									$	—
December 31, 2016
Impaired loans (1)	$	30,723	$	—	$	30,723	$	—	$	—
Mortgage servicing rights	18,087		—		—		18,087		—
Other real estate (2)	791		—		791		—		—
Total									$	—

(1) Represents carrying value and related write-downs of loans for which adjustments are based on agreed upon purchase prices for the loans or the appraised value of the collateral.

(2) Represents other real estate that is carried at the lower of carrying value or fair value less costs to sell. Fair value is generally based upon independent market prices or appraised values of the collateral.