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Fair Value (Assets and liabilities on recurring and non-recurring basis) (Details) - USD ($)
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available for sale securities $ 848,552,000   $ 645,797,000      
Money Market Funds, at Carrying Value 5,805,000   7,021,000      
Trading Securities 405,000   191,000      
Derivative Assets 1,265,000   771,000      
Servicing Assets 10,866,000   9,821,000      
Derivative liabilities (622,000)   (1,281,000)      
Total 866,271,000   662,320,000      
Impaired Commercial Loan 69,639,000   72,285,000      
Foreclosed real estate 37,868,000 $ 40,551,000 44,174,000 $ 47,275,000 $ 50,223,000 $ 47,520,000
Other repossessed assets 4,146,000   3,548,000      
Total 111,653,000   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 5,805,000   7,021,000      
Trading Securities 0   0      
Derivative Assets 0   0      
Servicing Assets 0   0      
Derivative liabilities 0   0      
Total 5,805,000   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 848,552,000   645,797,000      
Money Market Funds, at Carrying Value 0   0      
Trading Securities 405,000   191,000      
Derivative Assets 1,265,000   771,000      
Servicing Assets 0   0      
Derivative liabilities (622,000)   (1,281,000)      
Total 849,600,000   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 10,866,000   9,821,000      
Derivative liabilities 0   0      
Total 10,866,000   9,821,000      
Impaired Commercial Loan 69,639,000   72,285,000      
Foreclosed real estate 37,868,000   44,174,000      
Other repossessed assets 4,146,000   3,548,000      
Total 111,653,000   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 848,552,000   645,797,000      
Money Market Funds, at Carrying Value 5,805,000   7,021,000      
Trading Securities 405,000   191,000      
Derivative Assets 1,265,000   771,000      
Servicing Assets 10,866,000   9,821,000      
Derivative liabilities (622,000)   (1,281,000)      
Total 866,271,000   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 5,805,000   7,021,000      
Trading Securities 0   0      
Derivative Assets 0   0      
Servicing Assets 0   0      
Derivative liabilities 0   0      
Total 5,805,000   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 848,552,000   645,797,000      
Money Market Funds, at Carrying Value 0   0      
Trading Securities 405,000   191,000      
Derivative Assets 1,265,000   771,000      
Servicing Assets 0   0      
Derivative liabilities (622,000)   (1,281,000)      
Total 849,600,000   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 10,866,000   9,821,000      
Derivative liabilities 0   0      
Total 10,866,000   9,821,000      
Fair Value, Measurements, Nonrecurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impaired Commercial Loan 69,639,000   72,285,000      
Foreclosed real estate 37,868,000   44,174,000      
Other repossessed assets 4,146,000   3,548,000      
Total 111,653,000   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 69,639,000   72,285,000      
Foreclosed real estate 37,868,000   44,174,000      
Other repossessed assets 4,146,000   3,548,000      
Total $ 111,653,000   $ 120,007,000