Regulatory Matters (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount available for dividend distribution without affecting capital adequacy requirements	$ 324,000
Maximum allowed percentage of loans issued to a single affiliate	10.00%
Maximum allowed percentage of aggregate loans issued to all affiliate	20.00%
Excess tier one risk based capital		$ 1,000,000
Total Capital [Abstract]
Capital	$ 2,200,257	$ 2,179,147
Capital to risk weighted assets	12.80%	13.00%
Capital required for capital adequacy	$ 1,380,905	$ 1,338,560
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Tier One Risk Based Capital [Abstract]
Tier one risk based capital	$ 1,764,847	$ 1,737,060
Tier one risk based capital to risk weighted assets	10.20%	10.40%
Tier one risk based capital required for capital adequacy	$ 1,035,679	$ 1,003,920
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
CommonEquityTierOneCapitalAbstract [Abstract]
Common equity tier 1 capital	$ 1,764,847	$ 1,737,060
Common equity tier one capital ratio	10.20%	10.40%
Common equity tier one capital required for capital adequacy	$ 776,759	$ 752,940
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Tier One Leverage Capital [Abstract]
Tier one leverage capital	$ 1,764,847	$ 1,737,060
Tier one leverage capital to average assets	9.00%	8.90%
Tier one leverage capital required for capital adequacy	$ 783,118	$ 778,451
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Fulton Bank, N.A.
Total Capital [Abstract]
Capital	$ 1,319,090	$ 1,234,536
Capital to risk weighted assets	12.10%	12.30%
Capital required for capital adequacy	$ 871,413	$ 805,125
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required to be well capitalized	$ 1,089,267	$ 1,006,406
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier One Risk Based Capital [Abstract]
Tier one risk based capital	$ 1,225,797	$ 1,142,230
Tier one risk based capital to risk weighted assets	11.30%	11.30%
Tier one risk based capital required for capital adequacy	$ 653,560	$ 603,843
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
Tier one risk based capital required to be well capitalized	$ 871,413	$ 805,125
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	8.00%
CommonEquityTierOneCapitalAbstract [Abstract]
Common equity tier 1 capital	$ 1,181,797	$ 1,098,230
Common equity tier one capital ratio	10.80%	10.90%
Common equity tier one capital required for capital adequacy	$ 490,170	$ 452,883
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Common equity tier one capital required to be well-capitalized	$ 708,023	$ 654,164
Common equity tier one capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier One Leverage Capital [Abstract]
Tier one leverage capital	$ 1,225,797	$ 1,142,230
Tier one leverage capital to average assets	10.00%	10.00%
Tier one leverage capital required for capital adequacy	$ 487,992	$ 458,016
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized	$ 609,989	$ 572,520
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%
Fulton Bank of New Jersey
Total Capital [Abstract]
Capital	$ 418,207	$ 385,858
Capital to risk weighted assets	13.30%	12.40%
Capital required for capital adequacy	$ 250,999	$ 248,640
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required to be well capitalized	$ 313,748	$ 310,801
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier One Risk Based Capital [Abstract]
Tier one risk based capital	$ 378,962	$ 346,867
Tier one risk based capital to risk weighted assets	12.10%	11.20%
Tier one risk based capital required for capital adequacy	$ 188,249	$ 186,480
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
Tier one risk based capital required to be well capitalized	$ 250,999	$ 248,640
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	8.00%
CommonEquityTierOneCapitalAbstract [Abstract]
Common equity tier 1 capital	$ 378,962	$ 346,867
Common equity tier one capital ratio	12.10%	11.20%
Common equity tier one capital required for capital adequacy	$ 141,187	$ 139,860
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Common equity tier one capital required to be well-capitalized	$ 203,936	$ 202,020
Common equity tier one capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier One Leverage Capital [Abstract]
Tier one leverage capital	$ 378,962	$ 346,867
Tier one leverage capital to average assets	9.40%	8.80%
Tier one leverage capital required for capital adequacy	$ 162,098	$ 158,027
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized	$ 202,623	$ 197,534
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%
The Columbia Bank
Total Capital [Abstract]
Capital	$ 266,661	$ 234,647
Capital to risk weighted assets	12.90%	12.20%
Capital required for capital adequacy	$ 165,676	$ 153,441
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required to be well capitalized	$ 207,094	$ 191,801
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier One Risk Based Capital [Abstract]
Tier one risk based capital	$ 242,668	$ 215,651
Tier one risk based capital to risk weighted assets	11.70%	11.20%
Tier one risk based capital required for capital adequacy	$ 124,257	$ 115,081
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
Tier one risk based capital required to be well capitalized	$ 165,676	$ 153,441
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	8.00%
CommonEquityTierOneCapitalAbstract [Abstract]
Common equity tier 1 capital	$ 242,668	$ 215,651
Common equity tier one capital ratio	11.70%	11.20%
Common equity tier one capital required for capital adequacy	$ 93,192	$ 86,310
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Common equity tier one capital required to be well-capitalized	$ 134,611	$ 124,671
Common equity tier one capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier One Leverage Capital [Abstract]
Tier one leverage capital	$ 242,668	$ 215,651
Tier one leverage capital to average assets	10.10%	9.30%
Tier one leverage capital required for capital adequacy	$ 96,269	$ 92,797
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized	$ 120,336	$ 115,996
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%
Lafayette Ambassador Bank
Total Capital [Abstract]
Capital	$ 180,604	$ 173,097
Capital to risk weighted assets	16.00%	14.60%
Capital required for capital adequacy	$ 90,077	$ 94,720
Capital required for capital adequacy to risk weighted assets	8.00%	8.00%
Capital required to be well capitalized	$ 112,596	$ 118,400
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier One Risk Based Capital [Abstract]
Tier one risk based capital	$ 169,835	$ 162,292
Tier one risk based capital to risk weighted assets	15.10%	13.70%
Tier one risk based capital required for capital adequacy	$ 67,558	$ 71,040
Tier one risk based capital required for capital adequacy to risk weighted assets	6.00%	6.00%
Tier one risk based capital required to be well capitalized	$ 90,077	$ 94,720
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	8.00%
CommonEquityTierOneCapitalAbstract [Abstract]
Common equity tier 1 capital	$ 169,835	$ 162,292
Common equity tier one capital ratio	15.10%	13.70%
Common equity tier one capital required for capital adequacy	$ 50,668	$ 53,280
Common equity tier one capital required for capital adequacy to risk weighted assets	4.50%	4.50%
Common equity tier one capital required to be well-capitalized	$ 73,187	$ 76,960
Common equity tier one capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier One Leverage Capital [Abstract]
Tier one leverage capital	$ 169,835	$ 162,292
Tier one leverage capital to average assets	10.90%	10.10%
Tier one leverage capital required for capital adequacy	$ 62,520	$ 64,191
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized	$ 78,150	$ 80,239
Tier one leverage capital required to be well capitalized to average assets	5.00%	5.00%

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Compliance With Regulatory Capital Requirements Under Banking Regulations In Excess Of Threshold Amount

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Maximum Allowed Percentage Of Aggregate Loans Issued To All Affiliate

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The amount of dividends that can be declared or paid without affecting the banking or savings institution's regulatory capital position.

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The amount of total capital as defined in the regulations.

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