XML 65 R43.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Amortized Cost, Available-for-sale securities      
Amortized Cost $ 1,256,587,000 $ 1,909,184,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains 13,829,000 25,422,000  
Gross unrealized loss (4,207,000) (11,712,000)  
Fair Value, Available-for-sale securities      
Available-for-sale securities, at fair value $ 1,266,209,000 $ 1,922,894,000  
Yield, Available-for-sale securities      
Yield 2.86% 2.22%  
Amortized Cost, Held-to-maturity securities      
Amortized Cost $ 1,646,856,000 $ 1,417,599,000  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains 7,143,000 24,171,000  
Gross unrealized losses (18,086,000) (214,000)  
Fair Value, Held-to-maturity securities      
Fair Value 1,635,913,000 1,441,556,000  
Yield, Held-to-maturity securities      
Investments 2,903,443,000 3,326,783,000  
Gross unrealized gains on investments 20,972,000 49,593,000  
Gross unrealized losses on investments (22,293,000) (11,926,000)  
Fair value of investments $ 2,902,122,000 $ 3,364,450,000  
Yield on investments 3.02% 2.62%  
Available-for-sale securities purchased $ 76,367,000 $ 137,591,000 $ 315,114,000
Payments to acquire held-to-maturity securities 466,058,000 0 259,489,000
Proceeds from sales of available-for-sale investment securities 362,829,000 50,741,000 $ 246,826,000
Proceeds from sale of held-to-maturity securities $ 0    
Term of contractual due dates (in years) 25 years    
U.S. government and agency securities      
Amortized Cost, Available-for-sale securities      
Within 1 year $ 9,300,000 21,284,000  
1 to 5 years 5,688,000 12,477,000  
5 to 10 years 69,108,000 48,134,000  
Over 10 years 127,936,000 182,051,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year 146,000 0  
Gross unrealized gains, 1 to 5 years 2,000 1,027,000  
Gross unrealized gains, 5 to 10 years 0 0  
Gross unrealized gains, over 10 years 353,000 27,000  
Gross unrealized losses, within 1 year 0 (59,000)  
Gross unrealized losses, 1 to 5 years 0 (11,000)  
Gross unrealized losses, 5 to 10 years (1,238,000) (1,589,000)  
Gross unrealized losses, over 10 years (218,000) (3,990,000)  
Fair Value, Available-for-sale securities      
Within 1 year 9,446,000 21,225,000  
1 to 5 years 5,690,000 13,493,000  
5 to 10 years 67,870,000 46,545,000  
Over 10 years $ 128,071,000 $ 178,088,000  
Yield, Available-for-sale securities      
Within 1 year 10.38% 0.81%  
1 to 5 years 1.51% 7.94%  
5 to 10 years 1.93% 1.14%  
Over 10 years 1.92% 1.33%  
Equity Securities      
Amortized Cost, Available-for-sale securities      
1 to 5 years $ 500,000 $ 100,422,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, 1 to 5 years 22,000 1,402,000  
Gross unrealized losses, 1 to 5 years 0 0  
Fair Value, Available-for-sale securities      
1 to 5 years $ 522,000 $ 101,824,000  
Yield, Available-for-sale securities      
1 to 5 years 1.80% 1.90%  
Corporate debt securities      
Amortized Cost, Available-for-sale securities      
Within 1 year   $ 278,094,000  
1 to 5 years $ 63,622,000 63,481,000  
5 to 10 years 119,960,000 69,955,000  
Over 10 years   50,000,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year   325,000  
Gross unrealized gains, 1 to 5 years 2,083,000 928,000  
Gross unrealized gains, 5 to 10 years 210,000 0  
Gross unrealized gains, over 10 years   938,000  
Gross unrealized losses, within 1 year   (53,000)  
Gross unrealized losses, 1 to 5 years 0 (113,000)  
Gross unrealized losses, 5 to 10 years (577,000) (2,417,000)  
Gross unrealized losses, over 10 years   0  
Fair Value, Available-for-sale securities      
Within 1 year   278,366,000  
1 to 5 years 65,705,000 64,296,000  
5 to 10 years $ 119,593,000 67,538,000  
Over 10 years   $ 50,938,000  
Yield, Available-for-sale securities      
Within 1 year   1.33%  
1 to 5 years 2.96% 2.47%  
5 to 10 years 2.62% 1.96%  
Over 10 years   3.00%  
Municipal bonds      
Amortized Cost, Available-for-sale securities      
Within 1 year $ 2,344,000    
1 to 5 years 1,367,000 $ 2,315,000  
5 to 10 years   1,335,000  
Over 10 years 20,343,000 20,363,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, within 1 year 10,000    
Gross unrealized gains, 1 to 5 years 55,000 2,000  
Gross unrealized gains, 5 to 10 years   38,000  
Gross unrealized gains, over 10 years 2,505,000 3,617,000  
Gross unrealized losses, within 1 year 0    
Gross unrealized losses, 1 to 5 years 0 0  
Gross unrealized losses, 5 to 10 years   0  
Gross unrealized losses, over 10 years 0 0  
Fair Value, Available-for-sale securities      
Within 1 year 2,354,000    
1 to 5 years 1,422,000 2,317,000  
5 to 10 years   1,373,000  
Over 10 years $ 22,848,000 $ 23,980,000  
Yield, Available-for-sale securities      
Within 1 year 1.23%    
1 to 5 years 2.05% 1.23%  
5 to 10 years   2.05%  
Over 10 years 6.45% 6.45%  
Agency pass through mortgage-backed securities      
Amortized Cost, Available-for-sale securities      
Without single maturity date $ 828,069,000 $ 978,955,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, without single maturity date 8,402,000 17,118,000  
Gross unrealized losses, without single maturity date (2,174,000) (3,032,000)  
Fair Value, Available-for-sale securities      
Without single maturity date $ 834,297,000 $ 993,041,000  
Yield, Available-for-sale securities      
Without single maturity date 2.96% 2.58%  
Amortized Cost, Held-to-maturity securities      
Without single maturity date $ 1,646,856,000 $ 1,417,599,000  
Gross Unrealized Gains / Losses, Held-to-maturity securities      
Gross unrealized gains, without single maturity date 7,143,000 24,171,000  
Gross unrealized losses, without single maturity date (18,086,000) (214,000)  
Fair Value, Held-to-maturity securities      
Without single maturity date $ 1,635,913,000 $ 1,441,556,000  
Yield, Held-to-maturity securities      
Without a single maturity date 3.14% 3.18%  
Commercial MBS      
Amortized Cost, Available-for-sale securities      
Without single maturity date $ 8,350,000 $ 80,318,000  
Gross Unrealized Gains / Losses, Available-for-sale securities      
Gross unrealized gains, without single maturity date 41,000 0  
Gross unrealized losses, without single maturity date 0 (448,000)  
Fair Value, Available-for-sale securities      
Without single maturity date $ 8,391,000 $ 79,870,000  
Yield, Available-for-sale securities      
Without single maturity date 3.31% 1.91%