Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 4,707,975	$ 1,623,921
Debt Securities, Held-to-maturity, gross	245,531
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(688)
Investment securities	244,843	293,418
Available for sale securities	13,050,665	11,269,643
Fair value option securities	114,982	1,098,577
Residential mortgage loans held for sale	252,316	182,271
Loans	23,007,520	21,750,987
Allowance for loan losses	(388,640)	(210,759)	$ (207,457)	$ (230,682)
Loans, net of allowance	22,618,880	21,540,228
Mortgage servicing rights	101,172	201,886	259,254	252,867
Derivative contracts, net of cash margin, Assets, Fair Value	810,688	323,375
Time deposits	1,967,128	2,217,849
Subordinated debentures	276,005	275,923
Derivative contracts, net of cash margin, Liabilities, Fair Value	405,779	251,128
Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,077,535	14,031,650
Allowance for loan losses	(254,934)	(118,187)	(102,226)	(124,269)
Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,698,538	4,433,783
Allowance for loan losses	(86,558)	(51,805)	$ (60,026)	$ (56,621)
Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,549,137
Allowance for loan losses	(47,148)
Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,682,310
Allowance for loan losses	0
U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,183	44,264
Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,669,148	1,504,651
Debt Securities, Held-to-maturity, gross	8,913	10,676
Available for sale securities	9,340,471	8,046,096
Fair value option securities	114,982	1,088,660
Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	19,172	26,196
Debt Securities, Held-to-maturity, gross	229,245	274,535
Available for sale securities	167,979	1,861
U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	508	1,600
Fair value option securities	0	9,917
Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	32,770	41,609
Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	3,508,465	3,178,005
Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,472	34,726
Debt Securities, Held-to-maturity, gross	7,373	8,207
Available for sale securities	472	472
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	798,757	735,836
Interest-bearing cash and cash equivalents	381,816	522,985
Trading securities	4,707,975	1,623,921
Debt Securities, Held-to-maturity, gross	272,431
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Investment securities	272,431	314,402
Available for sale securities	13,050,665	11,269,643
Fair value option securities	114,982	1,098,577
Residential mortgage loans held for sale	252,316	182,271
Loans	22,885,806	21,689,329
Allowance for loan losses	0	0
Loans, net of allowance	22,885,806	21,689,329
Mortgage servicing rights	101,172	201,886
Derivative contracts, net of cash margin, Assets, Fair Value	810,688	323,375
Deposits with no stated maturity	34,176,752	25,403,319
Time deposits	1,976,936	2,212,467
Other borrowed funds	3,542,489	8,315,860
Subordinated debentures	269,544	284,627
Derivative contracts, net of cash margin, Liabilities, Fair Value	405,779	251,128
Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,003,383	13,966,221
Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,649,763	4,422,717
Estimate of Fair Value Measurement [Member] | Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		2,098,093
Estimate of Fair Value Measurement [Member] | Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		1,202,298
Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,563,199
Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,669,461
Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,183	44,264
Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,669,148	1,504,651
Debt Securities, Held-to-maturity, gross	9,790
Investment securities		11,164
Available for sale securities	9,340,471	8,046,096
Fair value option securities		1,088,660
Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	19,172	26,196
Debt Securities, Held-to-maturity, gross	255,270
Investment securities		295,032
Available for sale securities	167,979	1,861
Estimate of Fair Value Measurement [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		14,084
Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,472	34,726
Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	508	1,600
Fair value option securities		9,917
Estimate of Fair Value Measurement [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	32,770	41,609
Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	3,508,465	3,178,005
Estimate of Fair Value Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	7,371
Investment securities		8,206
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	798,757	735,836
Interest-bearing cash and cash equivalents	381,816	522,985
Trading securities	4,707,975	1,623,921
Debt Securities, Held-to-maturity, gross	245,531
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(688)
Investment securities	244,843	293,418
Available for sale securities	13,050,665	11,269,643
Fair value option securities	114,982	1,098,577
Residential mortgage loans held for sale	252,316	182,271
Loans	23,007,520	21,750,987
Allowance for loan losses	(388,640)	(210,759)
Loans, net of allowance	22,618,880	21,540,228
Mortgage servicing rights	101,172	201,886
Derivative contracts, net of cash margin, Assets, Fair Value	810,688	323,375
Deposits with no stated maturity	34,176,752	25,403,319
Time deposits	1,967,128	2,217,849
Other borrowed funds	3,545,356	8,345,405
Subordinated debentures	276,005	275,923
Derivative contracts, net of cash margin, Liabilities, Fair Value	405,779	251,128
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,077,535	14,031,650
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,698,538	4,433,783
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		2,084,172
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		1,201,382
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,549,137
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,682,310
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	9,183	44,264
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	4,669,148	1,504,651
Debt Securities, Held-to-maturity, gross	8,913
Investment securities		10,676
Available for sale securities	9,340,471	8,046,096
Fair value option securities		1,088,660
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	19,172	26,196
Debt Securities, Held-to-maturity, gross	229,245
Investment securities		274,535
Available for sale securities	167,979	1,861
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		14,084
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,472	34,726
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	508	1,600
Fair value option securities		9,917
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	32,770	41,609
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	3,508,465	3,178,005
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	7,373
Investment securities		8,207
Available for sale securities	472	472
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	798,757	735,836
Interest-bearing cash and cash equivalents	381,816	522,985
Trading securities	4,999	0
Debt Securities, Held-to-maturity, gross	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Investment securities	0	0
Available for sale securities	508	1,600
Fair value option securities	0	9,917
Residential mortgage loans held for sale	0	0
Loans	0	0
Allowance for loan losses	0	0
Loans, net of allowance	0	0
Mortgage servicing rights	0	0
Derivative contracts, net of cash margin, Assets, Fair Value	10,780	8,944
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 margin, Liabilities, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,999	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	0
Investment securities		0
Available for sale securities	0	0
Fair value option securities		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	0
Investment securities		0
Available for sale securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	508	1,600
Fair value option securities		9,917
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [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 Measurement [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 Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	0
Investment securities		0
Available for sale securities	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [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	4,702,976	1,623,921
Debt Securities, Held-to-maturity, gross	86,565
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Investment securities	86,565	116,267
Available for sale securities	13,049,685	11,267,571
Fair value option securities	114,982	1,088,660
Residential mortgage loans held for sale	245,299	173,958
Loans	0	0
Allowance for loan losses	0	0
Loans, net of allowance	0	0
Mortgage servicing rights	0	0
Derivative contracts, net of cash margin, Assets, Fair Value	799,908	314,431
Deposits with no stated maturity	0	0
Time deposits	0	0
Other borrowed funds	0	0
Subordinated debentures	269,544	284,627
Derivative contracts, net of cash margin, Liabilities, Fair Value	405,779	251,128
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,184	44,264
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	4,669,148	1,504,651
Debt Securities, Held-to-maturity, gross	9,790
Investment securities		11,164
Available for sale securities	9,340,471	8,046,096
Fair value option securities		1,088,660
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	19,172	26,196
Debt Securities, Held-to-maturity, gross	69,404
Investment securities		96,897
Available for sale securities	167,979	1,861
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		14,084
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,472	34,726
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair value option securities		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	32,770	41,609
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	3,508,465	3,178,005
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	7,371
Investment securities		8,206
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [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
Debt Securities, Held-to-maturity, gross	185,866
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0
Investment securities	185,866	198,135
Available for sale securities	472	472
Fair value option securities	0	0
Residential mortgage loans held for sale	7,017	8,313
Loans	22,885,806	21,689,329
Allowance for loan losses	0	0
Loans, net of allowance	22,885,806	21,689,329
Mortgage servicing rights	101,172	201,886
Derivative contracts, net of cash margin, Assets, Fair Value	0	0
Deposits with no stated maturity	34,176,752	25,403,319
Time deposits	1,976,936	2,212,467
Other borrowed funds	3,542,489	8,315,860
Subordinated debentures	0	0
Derivative contracts, net of cash margin, Liabilities, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	13,003,383	13,966,221
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,649,763	4,422,717
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		2,098,093
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans		1,202,298
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,563,199
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Paycheck Protection Program
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,669,461
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [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 Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	0
Investment securities		0
Available for sale securities	0	0
Fair value option securities		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	0	0
Debt Securities, Held-to-maturity, gross	185,866
Investment securities		198,135
Available for sale securities	0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Other trading 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 Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	0	0
Fair value option securities		0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [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 Measurement [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 Measurement [Member] | Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	0
Investment securities		0
Available for sale securities	$ 472	$ 472