SECURITIES (Schedule of Contractual maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 395,453	$ 420,703
Available for Sale, Fair Value
Debt Securities, Available-for-sale	412,860	426,424
Held to Maturity, Amortized Cost
Debt Securities, Held-to-maturity	724,512	740,806
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment	724,512	740,806
Held to Maturity, Fair Value
Fair Value	752,177	753,263
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesWithinOneYearAmortizedCost	2,599
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesWithinOneYearFairValue	2,624
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterOneThroughFiveYearsAmortizedCost	88,539
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterOneThroughFiveYearsFair Value	91,314
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterFiveThroughTenYearsAmortizedCost	118,670
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterFiveThroughTenYearsFairValue	125,216
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterTenYearsAmortizedCost	910,157
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterTenYearsFairValue	945,883
AvailableForSaleandHeldToMaturityDebtSecuritiesAmortizedCost	1,119,965
Debt Securities, Available-for-sale and Held-to-maturity Fair Value	1,165,037
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	10,001
Due after five to ten years	12,475
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	22,476	32,473
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	10,231
Due after five to ten years	13,885
Due after ten years	0
Debt Securities, Available-for-sale	24,116	33,115
Held to Maturity, Amortized Cost
Debt Securities, Held-to-maturity	0	12,874
Held to Maturity, Fair Value
Fair Value		12,997
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	600
Due after one year to five years	84,049
Due after five to ten years	41,930
Due after ten years	268,874
Available for Sale, Fair Value
Due in one year or less	601
Due in one year or less	86,672
Due after five to ten years	45,549
Due after ten years	280,038
Available-for-sale Securities	412,860
Held to Maturity, Amortized Cost
Due in one year or less	1,999
Due after one year to five years	4,490
Due after five to ten years	76,740
Due after ten years	641,283
Held to Maturity, Fair Value
Due in one year or less	2,023
Due after one year to five years	4,642
Due after five to ten years	79,667
Due after ten years	665,845
Fair Value	752,177
US Treasury Securities [Member]
Held to Maturity, Amortized Cost
Due in one year or less	1,999
Due after one year to five years	2,018
Due after five to ten years	0
Due after ten years	0
Debt Securities, Held-to-maturity	4,017	4,032
Held to Maturity, Fair Value
Due in one year or less	2,023
Due after one year to five years	2,054
Due after five to ten years	0
Due after ten years	0
Fair Value	4,077	4,053
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	74,048
Due after five to ten years	29,265
Due after ten years	120,980
Debt Securities, Available-for-sale, Amortized Cost	224,293	243,548
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	76,441
Due after five to ten years	31,458
Due after ten years	125,730
Debt Securities, Available-for-sale	233,629	247,000
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	2,472
Due after five to ten years	75,240
Due after ten years	278,373
Debt Securities, Held-to-maturity	356,085	397,414
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	2,588
Due after five to ten years	78,169
Due after ten years	293,364
Fair Value	374,121	405,802
Agency collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	88,687
Debt Securities, Available-for-sale, Amortized Cost	88,687	87,305
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	91,683
Debt Securities, Available-for-sale	91,683	88,511
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	335,993
Debt Securities, Held-to-maturity	335,993	293,662
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	344,119
Fair Value	344,119	297,314
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	600
Due after one year to five years	0
Due after five to ten years	190
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	790	1,377
Available for Sale, Fair Value
Due in one year or less	601
Due in one year or less	0
Due after five to ten years	206
Due after ten years	0
Debt Securities, Available-for-sale	807	1,396
Single issuer trust preferred securities issued by banks [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	489
Debt Securities, Available-for-sale, Amortized Cost	489	488
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	488
Debt Securities, Available-for-sale	488	493
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	1,500
Due after ten years	0
Debt Securities, Held-to-maturity	1,500	1,500
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	1,498
Due after ten years	0
Fair Value	1,498	1,490
Pooled Trust Preferred Securities Issued By Banks And Insurers [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	1,429
Debt Securities, Available-for-sale, Amortized Cost	1,429	1,488
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	1,056
Debt Securities, Available-for-sale	1,056	1,114
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	57,289
Debt Securities, Available-for-sale, Amortized Cost	57,289	54,024
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	0
Due after five to ten years	0
Due after ten years	61,081
Debt Securities, Available-for-sale	61,081	54,795
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	26,917
Debt Securities, Held-to-maturity	26,917	31,324
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	0
Due after five to ten years	0
Due after ten years	28,362
Fair Value	$ 28,362	$ 31,607