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Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities $ 4,891,096 $ 9,136,813    
Investment Securities, Gross Amortized Cost 184,457 210,999    
Investment securities, Allowance for Credit Loss (633) (555)    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 183,824 210,444    
Available for sale securities 12,894,534 13,157,817    
Fair value option securities 185,003 43,770    
Residential mortgage loans held for sale 169,474 192,295    
Loans and Leases Receivable, Gross 20,674,429 20,205,680    
Allowance for loan losses (246,473) (256,421)    
Loans, net of allowance 20,427,956 19,949,259    
Mortgage servicing rights 209,563 163,198 $ 132,915 $ 101,172
Derviative contracts, net of cash collateral, Assets, Fair value 2,680,207 1,097,297    
Time deposits 1,514,416 1,704,328    
Subordinated debentures 131,209 131,226    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,883,189 12,506,465    
Allowance for loan losses (151,448) (162,056)    
Commercial real estate [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 4,100,956 3,831,325    
Allowance for loan losses (58,974) (58,553)    
Paycheck Protection Program [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 137,365 276,341    
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 3,552,919 3,591,549    
Allowance for loan losses (36,051) (35,812)    
U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 13,513 23,610    
Residential agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 4,827,504 9,068,900    
Investment Securities, Gross Amortized Cost 6,486 6,939    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 24,539 25,783    
Investment Securities, Gross Amortized Cost 177,683 203,772    
Available for sale securities 526,322 508,365    
U.S. Treasury [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 947 1,000    
Residential non-agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 347,187 24,339    
Commercial agency mortgage-backed securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 4,407,585 4,617,025    
Other debt securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 25,540 18,520    
Investment Securities, Gross Amortized Cost 288 288    
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 767,805 712,067    
Interest-bearing cash and cash equivalents 599,976 2,125,343    
Trading securities 4,891,096 9,136,813    
Investment Securities, Gross Amortized Cost 184,457 210,999    
Investment securities, Allowance for Credit Loss (633) (555)    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 183,824 210,444    
Available for sale securities 12,894,534 13,157,817    
Residential mortgage loans held for sale 169,474 192,295    
Loans and Leases Receivable, Gross 20,674,429 20,205,680    
Allowance for loan losses (246,473) (256,421)    
Loans, net of allowance 20,427,956 19,949,259    
Mortgage servicing rights 209,563 163,198    
Derviative contracts, net of cash collateral, Assets, Fair value 2,680,207 1,097,297    
Deposits with no stated maturity 37,911,535 39,537,731    
Time deposits 1,514,416 1,704,328    
Other borrowed funds 1,104,575 2,363,202    
Subordinated debentures 131,209 131,226    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans and Leases Receivable, Gross 12,883,189 12,506,465    
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 4,100,956 3,831,325    
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 137,365 276,341    
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 3,552,919 3,591,549    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 13,513 23,610    
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 4,827,504 9,068,900    
Investment Securities, Gross Amortized Cost 6,486 6,939    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 24,539 25,783    
Investment Securities, Gross Amortized Cost 177,683 203,772    
Available for sale securities 526,322 508,365    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 25,540 18,520    
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 947 1,000    
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 347,187 24,339    
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 4,407,585 4,617,025    
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 288 288    
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 767,805 712,067    
Interest-bearing cash and cash equivalents 599,976 2,125,343    
Trading securities 4,891,096 9,136,813    
Investment Securities, Gross Amortized Cost 191,235 231,395    
Investment securities, Allowance for Credit Loss 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 191,235 231,395    
Available for sale securities 12,894,534 13,157,817    
Residential mortgage loans held for sale 169,474 192,295    
Loans and Leases Receivable, Gross 20,230,122 20,039,221    
Allowance for loan losses 0 0    
Loans, net of allowance 20,230,122 20,039,221    
Mortgage servicing rights 209,563 163,198    
Derviative contracts, net of cash collateral, Assets, Fair value 2,680,207 1,097,297    
Deposits with no stated maturity 37,911,535 39,537,731    
Time deposits 1,498,269 1,703,886    
Other borrowed funds 1,102,079 2,360,746    
Subordinated debentures 138,623 141,761    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
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 12,639,182 12,395,664    
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 3,985,876 3,786,767    
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 134,313 269,912    
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 3,470,751 3,586,878    
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 13,513 23,610    
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 4,827,504 9,068,900    
Investment Securities, Gross Amortized Cost 6,741 7,500    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 24,539 25,783    
Investment Securities, Gross Amortized Cost 184,214 223,609    
Available for sale securities 526,322 508,365    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 25,540 18,520    
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 947 1,000    
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 347,187 24,339    
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 4,407,585 4,617,025    
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 280 286    
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 767,805 712,067    
Interest-bearing cash and cash equivalents 599,976 2,125,343    
Trading securities 4,978 4,999    
Investment Securities, Gross Amortized Cost 0 0    
Investment securities, Allowance for Credit Loss 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 0 0    
Available for sale securities 947 1,000    
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 0 8,331    
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 0 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 4,978 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 947 1,000    
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 4,886,118 9,131,814    
Investment Securities, Gross Amortized Cost 48,941 65,484    
Investment securities, Allowance for Credit Loss 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 48,941 65,484    
Available for sale securities 12,893,115 13,156,345    
Residential mortgage loans held for sale 160,507 185,969    
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 2,680,207 1,088,966    
Deposits with no stated maturity 0 0    
Time deposits 0 0    
Other borrowed funds 0 0    
Subordinated debentures 138,623 141,761    
Derivative contracts, net of cash collateral, Liabilities, Fair Value 557,834 275,625    
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 8,535 18,611    
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 4,827,504 9,068,900    
Investment Securities, Gross Amortized Cost 6,741 7,500    
Available for sale securities 7,612,021 8,006,616    
Fair value option securities 185,003 43,770    
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 24,539 25,783    
Investment Securities, Gross Amortized Cost 41,920 57,698    
Available for sale securities 526,322 508,365    
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 25,540 18,520    
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 347,187 24,339    
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 4,407,585 4,617,025    
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 280 286    
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 142,294 165,911    
Investment securities, Allowance for Credit Loss 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 142,294 165,911    
Available for sale securities 472 472    
Residential mortgage loans held for sale 8,967 6,326    
Loans and Leases Receivable, Gross 20,230,122 20,039,221    
Allowance for loan losses 0 0    
Loans, net of allowance 20,230,122 20,039,221    
Mortgage servicing rights 209,563 163,198    
Derviative contracts, net of cash collateral, Assets, Fair value 0 0    
Deposits with no stated maturity 37,911,535 39,537,731    
Time deposits 1,498,269 1,703,886    
Other borrowed funds 1,102,079 2,360,746    
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 12,639,182 12,395,664    
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 3,985,876 3,786,767    
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 134,313 269,912    
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 3,470,751 3,586,878    
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 142,294 165,911    
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