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Fair Value (Assets and liabilities on recurring and non-recurring basis) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities $ 801,641,000 $ 645,797,000    
Money Market Funds, at Carrying Value 7,428,000 7,021,000    
Trading Securities 293,000 191,000    
Derivative Assets 898,000 771,000    
Servicing Assets 10,533,000 9,821,000    
Derivative liabilities (752,000) (1,281,000)    
Total 820,041,000 662,320,000    
Impaired Commercial Loan 68,580,000 72,285,000    
Foreclosed real estate 40,314,000 44,174,000 $ 47,551,000 $ 47,520,000
Other repossessed assets 5,082,000 3,548,000    
Total 113,976,000 120,007,000    
Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 0 0    
Money Market Funds, at Carrying Value 7,428,000 7,021,000    
Trading Securities 0 0    
Derivative Assets 0 0    
Servicing Assets 0 0    
Derivative liabilities 0 0    
Total 7,428,000 7,021,000    
Impaired Commercial Loan 0 0    
Foreclosed real estate 0 0    
Other repossessed assets 0 0    
Total 0 0    
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 801,641,000 645,797,000    
Money Market Funds, at Carrying Value 0 0    
Trading Securities 293,000 191,000    
Derivative Assets 898,000 771,000    
Servicing Assets 0 0    
Derivative liabilities (752,000) (1,281,000)    
Total 802,080,000 645,478,000    
Impaired Commercial Loan 0 0    
Foreclosed real estate 0 0    
Other repossessed assets 0 0    
Total 0 0    
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 0 0    
Money Market Funds, at Carrying Value 0 0    
Trading Securities 0 0    
Derivative Assets 0 0    
Servicing Assets 10,533,000 9,821,000    
Derivative liabilities 0 0    
Total 10,533,000 9,821,000    
Impaired Commercial Loan 68,580,000 72,285,000    
Foreclosed real estate 40,314,000 44,174,000    
Other repossessed assets 5,082,000 3,548,000    
Total 113,976,000 120,007,000    
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 801,641,000 645,797,000    
Money Market Funds, at Carrying Value 7,428,000 7,021,000    
Trading Securities 293,000 191,000    
Derivative Assets 898,000 771,000    
Servicing Assets 10,533,000 9,821,000    
Derivative liabilities (752,000) (1,281,000)    
Total 820,041,000 662,320,000    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 0 0    
Money Market Funds, at Carrying Value 7,428,000 7,021,000    
Trading Securities 0 0    
Derivative Assets 0 0    
Servicing Assets 0 0    
Derivative liabilities 0 0    
Total 7,428,000 7,021,000    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 801,641,000 645,797,000    
Money Market Funds, at Carrying Value 0 0    
Trading Securities 293,000 191,000    
Derivative Assets 898,000 771,000    
Servicing Assets 0 0    
Derivative liabilities (752,000) (1,281,000)    
Total 802,080,000 645,478,000    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 0 0    
Money Market Funds, at Carrying Value 0 0    
Trading Securities 0 0    
Derivative Assets 0 0    
Servicing Assets 10,533,000 9,821,000    
Derivative liabilities 0 0    
Total 10,533,000 9,821,000    
Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired Commercial Loan 68,580,000 72,285,000    
Foreclosed real estate 40,314,000 44,174,000    
Other repossessed assets 5,082,000 3,548,000    
Total 113,976,000 120,007,000    
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired Commercial Loan 0 0    
Foreclosed real estate 0 0    
Other repossessed assets 0 0    
Total 0 0    
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired Commercial Loan 0 0    
Foreclosed real estate 0 0    
Other repossessed assets 0 0    
Total 0 0    
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired Commercial Loan 68,580,000 72,285,000    
Foreclosed real estate 40,314,000 44,174,000    
Other repossessed assets 5,082,000 3,548,000    
Total $ 113,976,000 $ 120,007,000