SECURITIES (Schedule of Contractual maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,583,736	$ 395,453
Available for Sale, Fair Value
Debt Securities, Available-for-sale	1,571,148	412,860
Held to Maturity, Amortized Cost
Debt Securities, Held-to-maturity	1,066,818	724,512
Held to Maturity, Fair Value
Fair Value	1,064,133	752,177
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesWithinOneYearAmortizedCost	26,414
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesWithinOneYearFairValue	26,579
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterOneThroughFiveYearsAmortizedCost	818,467
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterOneThroughFiveYearsFair Value	809,993
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterFiveThroughTenYearsAmortizedCost	927,300
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterFiveThroughTenYearsFairValue	917,542
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterTenYearsAmortizedCost	878,373
AvailableForSaleandHeldToMaturityDebtSecuritiesMaturitiesAfterTenYearsFairValue	881,167
AvailableForSaleandHeldToMaturityDebtSecuritiesAmortizedCost	2,650,554
Debt Securities, Available-for-sale and Held-to-maturity Fair Value	2,635,281
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	10,000
Due after one year to five years	43,831
Due after five to ten years	163,562
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	217,393	22,476
Available for Sale, Fair Value
Due in one year or less	10,007
Due in one year or less	44,065
Due after five to ten years	161,410
Due after ten years	0
Debt Securities, Available-for-sale	215,482	24,116
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	32,987
Due after five to ten years	0
Due after ten years	0
Debt Securities, Held-to-maturity	32,987	0
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	32,546
Due after five to ten years	0
Due after ten years	0
Fair Value	32,546
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Due in one year or less	24,411
Due after one year to five years	782,464
Due after five to ten years	536,691
Due after ten years	240,170
Available for Sale, Fair Value
Due in one year or less	24,570
Due in one year or less	774,291
Due after five to ten years	528,685
Due after ten years	243,602
Debt Securities, Available-for-sale	1,571,148
Held to Maturity, Amortized Cost
Due in one year or less	2,003
Due after one year to five years	36,003
Due after five to ten years	390,609
Due after ten years	638,203
Held to Maturity, Fair Value
Due in one year or less	2,009
Due after one year to five years	35,702
Due after five to ten years	388,857
Due after ten years	637,565
Fair Value	1,064,133
US Treasury 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	643,068
Due after five to ten years	230,399
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	873,467	0
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	633,504
Due after five to ten years	227,944
Due after ten years	0
Debt Securities, Available-for-sale	861,448	0
Held to Maturity, Amortized Cost
Due in one year or less	2,003
Due after one year to five years	0
Due after five to ten years	100,557
Due after ten years	0
Debt Securities, Held-to-maturity	102,560	4,017
Held to Maturity, Fair Value
Due in one year or less	2,009
Due after one year to five years	0
Due after five to ten years	100,233
Due after ten years	0
Fair Value	102,242	4,077
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	14,411
Due after one year to five years	95,373
Due after five to ten years	142,730
Due after ten years	112,441
Debt Securities, Available-for-sale, Amortized Cost	364,955	224,293
Available for Sale, Fair Value
Due in one year or less	14,563
Due in one year or less	96,519
Due after five to ten years	139,331
Due after ten years	113,520
Debt Securities, Available-for-sale	363,933	233,629
Held to Maturity, Amortized Cost
Due in one year or less	0
Due after one year to five years	3,016
Due after five to ten years	288,552
Due after ten years	201,444
Debt Securities, Held-to-maturity	493,012	356,085
Held to Maturity, Fair Value
Due in one year or less	0
Due after one year to five years	3,156
Due after five to ten years	287,116
Due after ten years	206,964
Fair Value	497,236	374,121
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	78,966
Debt Securities, Available-for-sale, Amortized Cost	78,966	88,687
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	79,677
Debt Securities, Available-for-sale	79,677	91,683
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	415,736
Debt Securities, Held-to-maturity	415,736	335,993
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	408,845
Fair Value	408,845	344,119
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	0
Due after one year to five years	192
Due after five to ten years	0
Due after ten years	0
Debt Securities, Available-for-sale, Amortized Cost	192	790
Available for Sale, Fair Value
Due in one year or less	0
Due in one year or less	203
Due after five to ten years	0
Due after ten years	0
Debt Securities, Available-for-sale	203	807
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	489
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	491
Debt Securities, Available-for-sale	491	488
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	1,508
Due after ten years	0
Fair Value	1,508	1,498
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	1,199
Debt Securities, Available-for-sale, Amortized Cost	1,199	1,429
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	1,000
Debt Securities, Available-for-sale	1,000	1,056
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	47,075
Debt Securities, Available-for-sale, Amortized Cost	47,075	57,289
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	48,914
Debt Securities, Available-for-sale	48,914	61,081
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	21,023
Debt Securities, Held-to-maturity	21,023	26,917
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	21,756
Fair Value	$ 21,756	$ 28,362