XML 52 R59.htm IDEA: XBRL DOCUMENT v2.4.1.9
PREMISES AND EQUIPMENT (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Branch
Dec. 31, 2013
Branch
Dec. 31, 2012
Premises and equipment [Abstract]      
Premises and equipment, gross $ 56,216,000us-gaap_PropertyPlantAndEquipmentGross $ 63,265,000us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation and amortization (32,575,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (38,004,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Balance at end of year 23,641,000us-gaap_PropertyPlantAndEquipmentNet 25,261,000us-gaap_PropertyPlantAndEquipmentNet  
Depreciation and amortization 2,358,000us-gaap_DepreciationDepletionAndAmortization 3,258,000us-gaap_DepreciationDepletionAndAmortization 2,572,000us-gaap_DepreciationDepletionAndAmortization
Accelerated depreciation   507,000subk_AcceleratedDepreciation  
Number of branches closed during the period 4subk_NumberOfBranchesClosedDuringPeriod 2subk_NumberOfBranchesClosedDuringPeriod  
Depreciation and amortization on property under capital lease 243,000us-gaap_AmortizationOfLeasedAsset 244,000us-gaap_AmortizationOfLeasedAsset 244,000us-gaap_AmortizationOfLeasedAsset
Land [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives Indefinite    
Premises and equipment, gross 3,021,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
3,201,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Premises [Member]      
Premises and equipment [Abstract]      
Premises and equipment, gross 33,219,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
27,570,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Property under capital lease 4,000,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
4,000,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Premises [Member] | Minimum [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives 30 years    
Premises [Member] | Maximum [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives 40 years    
Furniture, Fixtures & Equipment [Member]      
Premises and equipment [Abstract]      
Premises and equipment, gross 16,349,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
28,669,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Furniture, Fixtures & Equipment [Member] | Minimum [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives 3 years    
Furniture, Fixtures & Equipment [Member] | Maximum [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives 7 years    
Leasehold Improvements [Member]      
Premises and equipment [Abstract]      
Premises and equipment, gross $ 3,627,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 3,825,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Leasehold Improvements [Member] | Minimum [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives 2 years    
Leasehold Improvements [Member] | Maximum [Member]      
Premises and equipment [Abstract]      
Estimated Useful Lives 25 years