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Other Borrowings Other Borrowings (Details - Trusts)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
ETBH Capital Trust I  
Debt Instrument [Line Items]  
Face Value $ 20
Maturity Date 2031
Annual Interest Rate 3.75% above 6-month LIBOR
Debt Instrument, Basis Spread on Variable Rate 3.75%
ETBH Capital Trust V, VI, VIII  
Debt Instrument [Line Items]  
Face Value $ 51
Maturity Date 2032
Annual Interest Rate 3.25%-3.65% above 3-month LIBOR
ETBH Capital Trust V, VI, VIII | Maximum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 3.65%
ETBH Capital Trust V, VI, VIII | Minimum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 3.25%
ETBH Capital Trust VII, IX—XII  
Debt Instrument [Line Items]  
Face Value $ 65
Maturity Date 2033
Annual Interest Rate 3.00%-3.30% above 3-month LIBOR
ETBH Capital Trust VII, IX—XII | Maximum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 3.30%
ETBH Capital Trust VII, IX—XII | Minimum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 3.00%
ETBH Capital Trust XIII—XVIII, XX  
Debt Instrument [Line Items]  
Face Value $ 77
Maturity Date 2034
Annual Interest Rate 2.45%-2.90% above 3-month LIBOR
ETBH Capital Trust XIII—XVIII, XX | Maximum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.90%
ETBH Capital Trust XIII—XVIII, XX | Minimum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.45%
ETBH Capital Trust XIX, XXI, XXII  
Debt Instrument [Line Items]  
Face Value $ 60
Maturity Date 2035
Annual Interest Rate 2.20%-2.40% above 3-month LIBOR
ETBH Capital Trust XIX, XXI, XXII | Maximum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.40%
ETBH Capital Trust XIX, XXI, XXII | Minimum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.20%
ETBH Capital Trust XXIII—XXIV  
Debt Instrument [Line Items]  
Face Value $ 45
Maturity Date 2036
Annual Interest Rate 2.10% above 3-month LIBOR
Debt Instrument, Basis Spread on Variable Rate 2.10%
ETBH Capital Trust XXV—XXX  
Debt Instrument [Line Items]  
Face Value $ 96
Maturity Date 2037
Annual Interest Rate 1.90%-2.00% above 3-month LIBOR
ETBH Capital Trust XXV—XXX | Maximum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 2.00%
ETBH Capital Trust XXV—XXX | Minimum [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.90%
Total  
Debt Instrument [Line Items]  
Face Value $ 414