FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

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

Assets and liabilities measured at fair value on a recurring and nonrecurring basis were as follows as of the dates indicated:

			Fair Value Measurements at Reporting Date Using
	Balance		Quoted  Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	December 31, 2020
	(Dollars in thousands)
Recurring fair value measurements
Assets
Trading securities	$	2,838	$	2,838	$	—	$	—
Equity securities	22,107		22,107		—		—
Securities available for sale
U.S. government agency securities	24,116		—		24,116		—
Agency mortgage-backed securities	233,629		—		233,629		—
Agency collateralized mortgage obligations	91,683		—		91,683		—
State, county, and municipal securities	807		—		807		—
Single issuer trust preferred securities issued by banks and insurers	488		—		488		—
Pooled trust preferred securities issued by banks and insurers	1,056		—		—		1,056
Small business administration pooled securities	61,081		—		61,081		—
Loans held for sale	58,104		—		58,104		—
Derivative instruments	187,399		—		187,399		—
Liabilities
Derivative instruments	134,064		—		134,064		—
Total recurring fair value measurements	$	549,244	$	24,945	$	523,243	$	1,056
Nonrecurring fair value measurements
Assets
Individually assessed collateral dependent loans	$	31,510	$	—	$	—	$	31,510
Total nonrecurring fair value measurements	$	31,510	$	—	$	—	$	31,510

Reconciliation of Assets on Recurring Basis Using Significant Unobservable Inputs

All assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) were valued using pricing models and discounted cash flow methodologies, as of December 31, 2020, 2019 and 2018. This reconciliation is presented in the table below for the periods indicated:

	2020		2019		2018
	(Dollars in thousands)
Pooled Trust Preferred Securities
Beginning balance	$	1,114	$	1,329	$	1,640
Gain and (losses) (realized/unrealized)
Included in other comprehensive income	—		(26)		191
Settlements	(58)		(189)		(502)
Ending Balance	$	1,056	$	1,114	$	1,329

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following table sets forth certain unobservable inputs regarding the Company's financial instruments that are classified as Level 3 as of December 31st of the years indicated:

Valuation Technique	Fair Value				Unobservable Inputs	Range		Weighted Average
	2020		2019			2020	2019	2020	2019
	(Dollars in thousands)
Discounted cash flow methodology
Pooled trust preferred securities	$	1,056	$	1,114	Cumulative prepayment	0% - 55%	0% - 57%	2.4%	2.6%
					Cumulative default	4% - 100%	2% - 100%	11.8%	13.5%
					Loss given default	85% - 100%	85% - 100%	94.0%	93.6%
					Cure given default	0% - 75%	0% - 75%	60.9%	60.9%
Appraisals of collateral (1)
Individually assessed collateral dependent loans	$	31,510	n/a
Collateral dependent impaired loans	n/a		$	25,515

(1)Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.

Schedule of Fair Values and Related Carrying Amounts by Balance Sheet Grouping

he estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the dates indicated:

					Fair Value Measurements at Reporting Date Using
	Carrying Value		Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	December 31, 2020
	(Dollars in thousands)
Financial assets
Securities held to maturity (a)
U.S. Treasury securities	$	4,017	$	4,077	$	—	$	4,077	$	—
Agency mortgage-backed securities	356,085		374,121		—		374,121		—
Agency collateralized mortgage obligations	335,993		344,119		—		344,119		—
Single issuer trust preferred securities issued by banks	1,500		1,498		—		1,498		—
Small business administration pooled securities	26,917		28,362		—		28,362		—
Loans, net of allowance for credit losses (b)	9,247,964		9,253,381		—		—		9,253,381
Federal Home Loan Bank stock (c)	10,250		10,250		—		10,250		—
Cash surrender value of life insurance policies (d)	200,525		200,525		—		200,525		—
Financial liabilities
Deposit liabilities, other than time deposits (e)	$	10,042,541	$	10,042,541	$	—	$	10,042,541	$	—
Time certificates of deposits (f)	950,629		955,598		—		955,598		—
Federal Home Loan Bank borrowings (f)	35,740		35,885		—		35,885		—
Long-term borrowings (f)	32,773		32,033		—		32,033		—
Junior subordinated debentures (g)	62,851		70,238		—		70,238		—
Subordinated debentures (f)	49,696		46,486		—		—		46,486

					Fair Value Measurements at Reporting Date Using
	Carrying Value		Fair Value		Quoted  Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	December 31, 2019
Financial assets	(Dollars in thousands)
Securities held to maturity (a)
U.S. government agency securities	$	12,874	$	12,997	$	—	$	12,997	$	—
U.S. Treasury securities	4,032		4,053		—		4,053		—
Agency mortgage-backed securities	397,414		405,802		—		405,802		—
Agency collateralized mortgage obligations	293,662		297,314		—		297,314		—
Single issuer trust preferred securities issued by banks	1,500		1,490		—		1,490		—
Small business administration pooled securities	31,324		31,607		—		31,607		—
Loans, net of allowance for loan losses (b)	8,780,384		8,613,635		—		—		8,613,635
Federal Home Loan Bank stock (c)	14,424		14,424		—		14,424		—
Cash surrender value of life insurance policies (d)	197,372		197,372		—		197,372		—
Financial liabilities
Deposit liabilities, other than time deposits (e)	$	7,752,052	$	7,752,052	$	—	$	7,752,052	$	—
Time certificates of deposits (f)	1,395,315		1,396,760		—		1,396,760		—
Federal Home Loan Bank borrowings (f)	115,748		115,881		—		115,881		—
Long-term borrowings (f)	74,906		72,219		—		72,219		—
Junior subordinated debentures (g)	62,848		65,603		—		65,603		—
Subordinated debentures (f)	49,601		52,870		—		—		52,870

(a)The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.

(b)Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis.

(c)Federal Home Loan Bank stock has no quoted market value and is carried at cost, therefore the carrying amount approximates fair value.

(d)Cash surrender value of life insurance is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore carrying amount approximates fair value.

(e)Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.

(f)Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.

(g)Fair value was determined based upon market prices of securities with similar terms and maturities.