FAIR VALUE (Schedule of Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Financial Assets:
Securities available for sale		$ 823,820	$ 622,689
FHLB and FRB stock		12,901	13,709
Loans held for sale, at fair value		3,974	13,588
Loans held for sale, at lower of cost or fair value		11,179	18,520
Accrued interest receivable		23,117	22,495
Financial Liabilities:
Short-term borrowings			15,000
Paycheck Protection Program Liquidity Facility		83,586	177,086
Carrying Value [Member]
Financial Assets:
Cash and cash equivalents		203,462	653,322
Securities available for sale		823,820	622,689
CRA investment fund		14,894	15,117
FHLB and FRB stock		12,901	13,709
Loans held for sale, at fair value		3,974	13,588
Loans held for sale, at lower of cost or fair value		11,179	18,520
Loans, net of allowance for loan and lease losses		4,505,328	4,305,128
Accrued interest receivable		23,117	22,495
Financial Liabilities:
Deposits		4,895,775	4,818,484
Short-term borrowings			15,000
Paycheck Protection Program Liquidity Facility		83,586	177,086
Subordinated debt		132,557	181,794
Accrued interest payable		1,028	1,650
Carrying Value [Member] | Designated as Hedging Instrument [Member]
Financial Liabilities:
Derivatives		6,203	9,616
Carrying Value [Member] | Not Designated as Hedging Instrument [Member]
Financial Assets:
Accrued interest receivable	[1]	4,716
Derivatives		51,855	79,529
Financial Liabilities:
Accrued interest payable		4,716
Derivatives		51,855	79,529
Fair value [Member]
Financial Assets:
Cash and cash equivalents		203,462	653,322
Securities available for sale		823,820	622,689
CRA investment fund		14,894	15,117
Loans held for sale, at fair value		3,974	13,588
Loans held for sale, at lower of cost or fair value		11,844	19,115
Loans, net of allowance for loan and lease losses		4,697,207	4,462,243
Accrued interest receivable		23,117	22,495
Financial Liabilities:
Deposits		4,900,317	4,826,406
Short-term borrowings			15,000
Paycheck Protection Program Liquidity Facility		83,586	177,086
Subordinated debt		130,523	183,348
Accrued interest payable		1,028	1,650
Fair value [Member] | Quoted Prices in Active Market For Identical Assets (Level 1) [Member]
Financial Assets:
Cash and cash equivalents		203,462	653,322
CRA investment fund		14,894	15,117
Financial Liabilities:
Deposits		4,384,210	4,222,370
Accrued interest payable		126	150
Fair value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Securities available for sale		823,820	622,689
Loans held for sale, at fair value		3,974	13,588
Loans held for sale, at lower of cost or fair value		11,844	19,115
Accrued interest receivable		2,190	1,653
Financial Liabilities:
Deposits		516,107	604,036
Short-term borrowings			15,000
Paycheck Protection Program Liquidity Facility		83,586	177,086
Accrued interest payable		827	1,347
Fair value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial Assets:
Loans, net of allowance for loan and lease losses		4,697,207	4,462,243
Accrued interest receivable		20,927	20,842
Financial Liabilities:
Subordinated debt		130,523	183,348
Accrued interest payable		75	153
Fair value [Member] | Designated as Hedging Instrument [Member]
Financial Liabilities:
Derivatives		6,203	9,616
Fair value [Member] | Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Liabilities:
Derivatives		6,203	9,616
Fair value [Member] | Not Designated as Hedging Instrument [Member]
Financial Assets:
Accrued interest receivable	[1]	4,716
Derivatives		51,855	79,529
Financial Liabilities:
Accrued interest payable		4,716
Derivatives		51,855	79,529
Fair value [Member] | Not Designated as Hedging Instrument [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets:
Accrued interest receivable	[1]	4,716
Derivatives		51,855	79,529
Financial Liabilities:
Accrued interest payable		4,716
Derivatives		$ 51,855	$ 79,529

[1] Included in other assets in the Consolidated Statement of Condition.