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Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities $ 5,554,040   $ 4,707,975      
Investment Securities, Gross Amortized Cost 216,062   245,531      
Investment securities, Allowance for Credit Loss (470)   (688)      
Investment securities, net of allowance 215,592   244,843      
Available for sale securities 13,342,113   13,050,665      
Fair value option securities 51,019   114,982      
Residential mortgage loans held for sale 176,813   252,316      
Loans and Leases Receivable, Gross 20,347,936   23,007,520      
Allowance for loan losses (276,680)   (388,640)      
Loans, net of allowance 20,071,256   22,618,880      
Mortgage servicing rights 133,308 $ 117,629 101,172 $ 97,644 $ 97,971 $ 201,886
Derviative contracts, net of cash collateral, Assets, Fair value 1,901,136   810,688      
Time deposits 1,780,715   1,967,128      
Subordinated debentures 131,220   276,005      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 739,641   405,779      
Commercial [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and Leases Receivable, Gross 12,175,140   13,077,535      
Allowance for loan losses (176,160)   (254,934)      
Commercial real estate [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and Leases Receivable, Gross 4,116,892   4,698,538      
Allowance for loan losses (59,928)   (86,558)      
Paycheck Protection Program [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and Leases Receivable, Gross 536,052   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 3,519,852   3,549,137      
Allowance for loan losses (40,592)   (47,148)      
U.S. government securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 8,863   9,183      
Residential agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 5,469,676   4,669,148      
Investment Securities, Gross Amortized Cost 7,412   8,913      
Available for sale securities 8,168,025   9,340,471      
Fair value option securities 51,019   114,982      
Municipal securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 35,894   19,172      
Investment Securities, Gross Amortized Cost 207,393   229,245      
Available for sale securities 461,619   167,979      
U.S. Treasury [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 502   508      
Residential non-agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 26,072   32,770      
Commercial agency mortgage-backed securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 4,685,423   3,508,465      
Other debt securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 39,607   10,472      
Investment Securities, Gross Amortized Cost 1,257   7,373      
Available for sale securities 472   472      
Carrying (Reported) Amount, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 729,285   798,757      
Interest-bearing cash and cash equivalents 1,162,477   381,816      
Trading securities 5,554,040   4,707,975      
Investment Securities, Gross Amortized Cost 216,062   245,531      
Investment securities, Allowance for Credit Loss (470)   (688)      
Investment securities, net of allowance 215,592   244,843      
Available for sale securities 13,342,113   13,050,665      
Residential mortgage loans held for sale 176,813   252,316      
Loans and Leases Receivable, Gross 20,347,936   23,007,520      
Allowance for loan losses (276,680)   (388,640)      
Loans, net of allowance 20,071,256   22,618,880      
Mortgage servicing rights 133,308   101,172      
Derviative contracts, net of cash collateral, Assets, Fair value 1,901,136   810,688      
Deposits with no stated maturity 36,743,836   34,176,752      
Time deposits 1,780,715   1,967,128      
Other borrowed funds 880,699   3,545,356      
Subordinated debentures 131,220   276,005      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 739,641   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 12,175,140   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 4,116,892   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 536,052   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 3,519,852   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 8,863   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 5,469,676   4,669,148      
Investment Securities, Gross Amortized Cost 7,412   8,913      
Available for sale securities 8,168,025   9,340,471      
Fair value option securities 51,019   114,982      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 35,894   19,172      
Investment Securities, Gross Amortized Cost 207,393   229,245      
Available for sale securities 461,619   167,979      
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 39,607   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 502   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 26,072   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 4,685,423   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 1,257   7,373      
Available for sale securities 472   472      
Estimate of Fair Value, Fair Value Disclosure [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 729,285   798,757      
Interest-bearing cash and cash equivalents 1,162,477   381,816      
Trading securities 5,554,040   4,707,975      
Investment Securities, Gross Amortized Cost 238,489   272,431      
Investment securities, Allowance for Credit Loss 0   0      
Investment securities, net of allowance 238,489   272,431      
Available for sale securities 13,342,113   13,050,665      
Residential mortgage loans held for sale 176,813   252,316      
Loans and Leases Receivable, Gross 20,184,655   22,885,806      
Allowance for loan losses 0   0      
Loans, net of allowance 20,184,655   22,885,806      
Mortgage servicing rights 133,308   101,172      
Derviative contracts, net of cash collateral, Assets, Fair value 1,901,136   810,688      
Deposits with no stated maturity 36,743,836   34,176,752      
Time deposits 1,783,165   1,976,936      
Other borrowed funds 877,709   3,542,489      
Subordinated debentures 143,381   269,544      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 739,641   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 12,054,326   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 4,085,030   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 525,990   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 3,519,309   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 8,863   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 5,469,676   4,669,148      
Investment Securities, Gross Amortized Cost 8,084   9,790      
Available for sale securities 8,168,025   9,340,471      
Fair value option securities 51,019   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 35,894   19,172      
Investment Securities, Gross Amortized Cost 229,149   255,270      
Available for sale securities 461,619   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 39,607   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 502   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 26,072   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 4,685,423   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 1,256   7,371      
Available for sale securities 472   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 729,285   798,757      
Interest-bearing cash and cash equivalents 1,162,477   381,816      
Trading securities 4,999   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 502   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 1,109   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 233,266   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 4,999   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 502   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 5,549,041   4,702,976      
Investment Securities, Gross Amortized Cost 71,022   86,565      
Investment securities, Allowance for Credit Loss 0   0      
Investment securities, net of allowance 71,022   86,565      
Available for sale securities 13,341,139   13,049,685      
Residential mortgage loans held for sale 170,338   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 1,900,027   799,908      
Deposits with no stated maturity 0   0      
Time deposits 0   0      
Other borrowed funds 0   0      
Subordinated debentures 143,381   269,544      
Derivative contracts, net of cash collateral, Liabilities, Fair Value 506,375   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 3,864   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 5,469,676   4,669,148      
Investment Securities, Gross Amortized Cost 8,084   9,790      
Available for sale securities 8,168,025   9,340,471      
Fair value option securities 51,019   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 35,894   19,172      
Investment Securities, Gross Amortized Cost 61,682   69,404      
Available for sale securities 461,619   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 39,607   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 26,072   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 4,685,423   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 1,256   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 167,467   185,866      
Investment securities, Allowance for Credit Loss 0   0      
Investment securities, net of allowance 167,467   185,866      
Available for sale securities 472   472      
Residential mortgage loans held for sale 6,475   7,017      
Loans and Leases Receivable, Gross 20,184,655   22,885,806      
Allowance for loan losses 0   0      
Loans, net of allowance 20,184,655   22,885,806      
Mortgage servicing rights 133,308   101,172      
Derviative contracts, net of cash collateral, Assets, Fair value 0   0      
Deposits with no stated maturity 36,743,836   34,176,752      
Time deposits 1,783,165   1,976,936      
Other borrowed funds 877,709   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 12,054,326   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 4,085,030   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 525,990   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 3,519,309   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 167,467   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 $ 472   $ 472