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Fair Value Measurements, Measured On Recurring Basis Significant Unobservable Inputs (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period $ 10,093,000 $ 17,805,000
Transfers to Level 3 from Level 2 0 0
Purchases and capital calls 0 0
Redemptions and distributions 0 (7,487,000)
Proceeds from sales 0 0
Other comprehensive income (loss) (483,000) 10,000
Balance at end of period 9,610,000 10,093,000
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member] | Mortgage banking revenue [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member] | Gain on assets, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member] | Gain on available for sale securities, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 (235,000)
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member] | Charitable contributions to BOKF Foundation [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Other debt securities [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period 4,150,000 4,712,000
Transfers to Level 3 from Level 2 0 0
Purchases and capital calls 0 0
Redemptions and distributions 0 (500,000)
Proceeds from sales 0 0
Other comprehensive income (loss) 1,000 (62,000)
Balance at end of period 4,151,000 4,150,000
Available for sale securities [Member] | Other debt securities [Member] | Mortgage banking revenue [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Other debt securities [Member] | Gain on assets, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Other debt securities [Member] | Gain on available for sale securities, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Other debt securities [Member] | Charitable contributions to BOKF Foundation [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Equity securities and mutual funds [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period 0 4,207,000
Transfers to Level 3 from Level 2 0 0
Purchases and capital calls 0 0
Redemptions and distributions 0 0
Proceeds from sales 0 0
Other comprehensive income (loss) 0 (1,787,000)
Balance at end of period 0 0
Available for sale securities [Member] | Equity securities and mutual funds [Member] | Mortgage banking revenue [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Equity securities and mutual funds [Member] | Gain on assets, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Equity securities and mutual funds [Member] | Gain on available for sale securities, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Available for sale securities [Member] | Equity securities and mutual funds [Member] | Charitable contributions to BOKF Foundation [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 (2,420,000)
Residential mortgage loans held for sale [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period 11,856,000 0
Transfers to Level 3 from Level 2 2,193,000 13,644,000
Purchases and capital calls 0 0
Redemptions and distributions 0 0
Proceeds from sales (6,283,000) (1,176,000)
Other comprehensive income (loss) 0 0
Balance at end of period 7,874,000 11,856,000
Residential mortgage loans held for sale [Member] | Mortgage banking revenue [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 108,000 (612,000)
Residential mortgage loans held for sale [Member] | Gain on assets, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Residential mortgage loans held for sale [Member] | Gain on available for sale securities, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Residential mortgage loans held for sale [Member] | Charitable contributions to BOKF Foundation [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Other assets - private equity funds [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period 25,627,000 27,341,000
Transfers to Level 3 from Level 2 0 0
Purchases and capital calls 1,027,000 1,012,000
Redemptions and distributions (6,955,000) (7,473,000)
Proceeds from sales 0 0
Other comprehensive income (loss) 0 0
Balance at end of period 22,472,000 25,627,000
Other assets - private equity funds [Member] | Mortgage banking revenue [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Other assets - private equity funds [Member] | Gain on assets, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 2,773,000 4,747,000
Other assets - private equity funds [Member] | Gain on available for sale securities, net [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings 0 0
Other assets - private equity funds [Member] | Charitable contributions to BOKF Foundation [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Gain (loss) recognized in earnings $ 0 $ 0