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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Land and Land Development by State) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 4,246,476 $ 3,833,820 $ 3,762,599
Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 2,406,284    
Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 1,134,003    
Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 339,554    
Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 366,635    
Land and land development [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 121,565    
Percent of land and land development loans 100.00%    
Land and land development [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 63,176    
Percent of land and land development loans 52.00%    
Land and land development [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 54,123    
Percent of land and land development loans 44.50%    
Land and land development [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 3,816    
Percent of land and land development loans 3.10%    
Land and land development [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 450    
Percent of land and land development loans 0.40%    
Land and land development - residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 105,146 102,435  
Land and land development - residential [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 57,586    
Land and land development - residential [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 46,094    
Land and land development - residential [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 1,016    
Land and land development - residential [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 450    
Land and land development - residential [Member] | Acquisition and Development [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 57,143    
Land and land development - residential [Member] | Acquisition and Development [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 32,047    
Land and land development - residential [Member] | Acquisition and Development [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 24,220    
Land and land development - residential [Member] | Acquisition and Development [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 876    
Land and land development - residential [Member] | Acquisition and Development [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 0    
Land and land development - residential [Member] | Improved Land and Lots [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 41,155    
Land and land development - residential [Member] | Improved Land and Lots [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 22,292    
Land and land development - residential [Member] | Improved Land and Lots [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 18,273    
Land and land development - residential [Member] | Improved Land and Lots [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 140    
Land and land development - residential [Member] | Improved Land and Lots [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 450    
Land and land development - residential [Member] | Unimproved Land [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 6,848    
Land and land development - residential [Member] | Unimproved Land [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 3,247    
Land and land development - residential [Member] | Unimproved Land [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 3,601    
Land and land development - residential [Member] | Unimproved Land [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 0    
Land and land development - residential [Member] | Unimproved Land [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 0    
Land and land development - commercial and industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 16,419 $ 11,152  
Land and land development - commercial and industrial [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 5,590    
Land and land development - commercial and industrial [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 8,029    
Land and land development - commercial and industrial [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 2,800    
Land and land development - commercial and industrial [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 0    
Land and land development - commercial and industrial [Member] | Improved Land and Lots [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 10,909    
Land and land development - commercial and industrial [Member] | Improved Land and Lots [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 3,362    
Land and land development - commercial and industrial [Member] | Improved Land and Lots [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 5,742    
Land and land development - commercial and industrial [Member] | Improved Land and Lots [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 1,805    
Land and land development - commercial and industrial [Member] | Improved Land and Lots [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 0    
Land and land development - commercial and industrial [Member] | Unimproved Land [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 5,510    
Land and land development - commercial and industrial [Member] | Unimproved Land [Member] | Washington [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 2,228    
Land and land development - commercial and industrial [Member] | Unimproved Land [Member] | Oregon [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 2,287    
Land and land development - commercial and industrial [Member] | Unimproved Land [Member] | Idaho [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding 995    
Land and land development - commercial and industrial [Member] | Unimproved Land [Member] | Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans outstanding $ 0