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Fair Value (Assets and liabilities on recurring and non-recurring basis) (Details) - USD ($)
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available for sale securities $ 613,423,000   $ 751,484,000      
Money Market Funds, at Carrying Value 6,530,000   5,606,000      
Trading Securities 284,000   347,000      
Derivative Assets 809,000   1,330,000      
Servicing Assets 9,818,000   9,858,000      
Derivative liabilities (1,677,000)   (2,437,000)      
Total 629,187,000   766,188,000      
Impaired Commercial Loan 67,788,000   54,289,000      
Foreclosed real estate 47,275,000 $ 50,223,000 47,520,000 $ 45,740,000 $ 51,220,000 $ 58,176,000
Other repossessed assets 3,829,000   3,224,000      
Total 118,892,000   105,033,000      
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 6,530,000   5,606,000      
Trading Securities 0   0      
Derivative Assets 0   0      
Servicing Assets 0   0      
Derivative liabilities 0   0      
Total 6,530,000   5,606,000      
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 613,423,000   751,484,000      
Money Market Funds, at Carrying Value 0   0      
Trading Securities 284,000   347,000      
Derivative Assets 809,000   1,330,000      
Servicing Assets 0   0      
Derivative liabilities (1,677,000)   (2,437,000)      
Total 612,839,000   750,724,000      
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 9,818,000   9,858,000      
Derivative liabilities 0          
Total 9,818,000   9,858,000      
Impaired Commercial Loan 67,788,000   54,289,000      
Foreclosed real estate 47,275,000   47,520,000      
Other repossessed assets 3,829,000   3,224,000      
Total 118,892,000   105,033,000      
Fair Value, Measurements, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available for sale securities 613,423,000   751,484,000      
Money Market Funds, at Carrying Value 6,530,000   5,606,000      
Trading Securities 284,000   347,000      
Derivative Assets 809,000   1,330,000      
Servicing Assets 9,818,000   9,858,000      
Derivative liabilities (1,677,000)   (2,437,000)      
Total 629,187,000   766,188,000      
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 6,530,000   5,606,000      
Trading Securities 0   0      
Derivative Assets 0   0      
Servicing Assets 0   0      
Derivative liabilities 0   0      
Total 6,530,000   5,606,000      
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 613,423,000   751,484,000      
Money Market Funds, at Carrying Value 0   0      
Trading Securities 284,000   347,000      
Derivative Assets 809,000   1,330,000      
Servicing Assets 0   0      
Derivative liabilities (1,677,000)   (2,437,000)      
Total 612,839,000   750,724,000      
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 9,818,000   9,858,000      
Derivative liabilities 0   0      
Total 9,818,000   9,858,000      
Fair Value, Measurements, Nonrecurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impaired Commercial Loan 67,788,000   54,289,000      
Foreclosed real estate 47,275,000   47,520,000      
Other repossessed assets 3,829,000   3,224,000      
Total 118,892,000   105,033,000      
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 67,788,000   54,289,000      
Foreclosed real estate 47,275,000   47,520,000      
Other repossessed assets 3,829,000   3,224,000      
Total $ 118,892,000   $ 105,033,000