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Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities $ 5,085,949 $ 4,707,975    
Investment Securities, Gross Amortized Cost 226,738 245,531    
Investment securities, Allowance for Credit Loss (617) (688)    
Investment securities, net of allowance 226,121 244,843    
Available for sale securities 13,410,057 13,050,665    
Fair value option securities 72,498 114,982    
Residential mortgage loans held for sale 284,447 252,316    
Loans and Leases Receivable, Gross 22,533,847 23,007,520    
Allowance for loan losses (352,402) (388,640)    
Loans, net of allowance 22,181,445 22,618,880    
Mortgage servicing rights 132,915 101,172 $ 110,828 $ 201,886
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Time deposits 2,004,356 1,967,128    
Subordinated debentures 276,024 276,005    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,657,784 13,077,535    
Allowance for loan losses (231,372) (254,934)    
Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,503,347 4,698,538    
Allowance for loan losses (81,746) (86,558)    
Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,848,550 1,682,310    
Allowance for loan losses 0 0    
Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,524,166 3,549,137    
Allowance for loan losses (39,284) (47,148)    
U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 33,613 9,183    
Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 8,477 8,913    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 216,047 229,245    
Available for sale securities 245,657 167,979    
U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 506 508    
Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 31,382 32,770    
Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 3,426,727 3,508,465    
Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
Investment Securities, Gross Amortized Cost 2,214 7,373    
Available for sale securities 471 472    
Carrying (Reported) Amount, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 723,983 798,757    
Interest-bearing cash and cash equivalents 695,213 381,816    
Trading securities 5,085,949 4,707,975    
Investment Securities, Gross Amortized Cost 226,738 245,531    
Investment securities, Allowance for Credit Loss (617) (688)    
Investment securities, net of allowance 226,121 244,843    
Available for sale securities 13,410,057 13,050,665    
Residential mortgage loans held for sale 284,447 252,316    
Loans and Leases Receivable, Gross 22,533,847 23,007,520    
Allowance for loan losses (352,402) (388,640)    
Loans, net of allowance 22,181,445 22,618,880    
Mortgage servicing rights 132,915 101,172    
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Deposits with no stated maturity 35,848,270 34,176,752    
Time deposits 2,004,356 1,967,128    
Other borrowed funds 2,503,678 3,545,356    
Subordinated debentures 276,024 276,005    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,657,784 13,077,535    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,503,347 4,698,538    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,848,550 1,682,310    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,524,166 3,549,137    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 33,613 9,183    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 8,477 8,913    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 216,047 229,245    
Available for sale securities 245,657 167,979    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 506 508    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 31,382 32,770    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 3,426,727 3,508,465    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 2,214 7,373    
Available for sale securities 471 472    
Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 723,983 798,757    
Interest-bearing cash and cash equivalents 695,213 381,816    
Trading securities 5,085,949 4,707,975    
Investment Securities, Gross Amortized Cost 252,707 272,431    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 252,707 272,431    
Available for sale securities 13,410,057 13,050,665    
Residential mortgage loans held for sale 284,447 252,316    
Loans and Leases Receivable, Gross 22,331,508 22,885,806    
Allowance for loan losses 0 0    
Loans, net of allowance 22,331,508 22,885,806    
Mortgage servicing rights 132,915 101,172    
Derviative contracts, net of cash collateral, Assets, Fair value 1,289,156 810,688    
Deposits with no stated maturity 35,848,270 34,176,752    
Time deposits 2,008,294 1,976,936    
Other borrowed funds 2,500,771 3,542,489    
Subordinated debentures 288,109 269,544    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 719,556 405,779    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,546,069 13,003,383    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,435,740 4,649,763    
Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,820,749 1,669,461    
Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,528,950 3,563,199    
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 33,613 9,183    
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 9,216 9,790    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 241,278 255,270    
Available for sale securities 245,657 167,979    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 506 508    
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 31,382 32,770    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 3,426,727 3,508,465    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 2,213 7,371    
Available for sale securities 471 472    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 723,983 798,757    
Interest-bearing cash and cash equivalents 695,213 381,816    
Trading securities 2,070 4,999    
Investment Securities, Gross Amortized Cost 0 0    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 0 0    
Available for sale securities 506 508    
Residential mortgage loans held for sale 0 0    
Loans and Leases Receivable, Gross 0 0    
Allowance for loan losses 0 0    
Loans, net of allowance 0 0    
Mortgage servicing rights 0 0    
Derviative contracts, net of cash collateral, Assets, Fair value 2,772 10,780    
Deposits with no stated maturity 0 0    
Time deposits 0 0    
Other borrowed funds 0 0    
Subordinated debentures 0 0    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 2,721 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 2,070 4,999    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 0 0    
Available for sale securities 0 0    
Fair value option securities 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 0 0    
Available for sale securities 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 506 508    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 0 0    
Available for sale securities 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 0 0    
Interest-bearing cash and cash equivalents 0 0    
Trading securities 5,083,879 4,702,976    
Investment Securities, Gross Amortized Cost 78,939 86,565    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 78,939 86,565    
Available for sale securities 13,409,080 13,049,685    
Residential mortgage loans held for sale 279,151 245,299    
Loans and Leases Receivable, Gross 0 0    
Allowance for loan losses 0 0    
Loans, net of allowance 0 0    
Mortgage servicing rights 0 0    
Derviative contracts, net of cash collateral, Assets, Fair value 1,286,384 799,908    
Deposits with no stated maturity 0 0    
Time deposits 0 0    
Other borrowed funds 0 0    
Subordinated debentures 288,109 269,544    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 716,835 405,779    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 31,543 4,184    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 5,003,163 4,669,148    
Investment Securities, Gross Amortized Cost 9,216 9,790    
Available for sale securities 9,705,314 9,340,471    
Fair value option securities 72,498 114,982    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,047 19,172    
Investment Securities, Gross Amortized Cost 67,510 69,404    
Available for sale securities 245,657 167,979    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 22,126 10,472    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 31,382 32,770    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 3,426,727 3,508,465    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 2,213 7,371    
Available for sale securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 0 0    
Interest-bearing cash and cash equivalents 0 0    
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 173,768 185,866    
Investment securities, Allowance for Credit Loss 0 0    
Investment securities, net of allowance 173,768 185,866    
Available for sale securities 471 472    
Residential mortgage loans held for sale 5,296 7,017    
Loans and Leases Receivable, Gross 22,331,508 22,885,806    
Allowance for loan losses 0 0    
Loans, net of allowance 22,331,508 22,885,806    
Mortgage servicing rights 132,915 101,172    
Derviative contracts, net of cash collateral, Assets, Fair value 0 0    
Deposits with no stated maturity 35,848,270 34,176,752    
Time deposits 2,008,294 1,976,936    
Other borrowed funds 2,500,771 3,542,489    
Subordinated debentures 0 0    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,546,069 13,003,383    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,435,740 4,649,763    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 1,820,749 1,669,461    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Loans to individuals [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 3,528,950 3,563,199    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 0 0    
Available for sale securities 0 0    
Fair value option securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Investment Securities, Gross Amortized Cost 173,768 185,866    
Available for sale securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment Securities, Gross Amortized Cost 0 0    
Available for sale securities $ 471 $ 472