Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	$ 5,193,505		$ 4,464,161
Debt Securities, Held-to-maturity, gross	2,409,090		2,739,241
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(336)	[1]	(558)	[2]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,408,754		2,738,683
Available for sale securities	12,286,681		11,493,860
Fair value option securities	20,671		296,590
Residential mortgage loans held for sale	56,935		75,272
Loans and Leases Receivable, Gross	23,904,968		22,557,150
Allowance for loan losses	(277,123)		(235,704)
Loans, net of allowance	23,627,845		22,321,446
Mortgage servicing rights	293,884		277,608		$ 163,198	$ 101,172
Derivative contracts, net of cash margin, Assets, Fair Value	410,304		880,343
Time deposits	3,012,022		1,461,842
Subordinated debentures	131,150		131,205
Derivative contracts, net of cash margin, Liabilities, Fair Value	587,473		554,900
Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	14,803,769		14,212,499
Allowance for loan losses	(141,232)		(131,586)
Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	5,337,647		4,606,777
Allowance for loan losses	(94,718)		(57,648)
Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,763,552		3,737,874
Allowance for loan losses	(41,173)		(46,470)
U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,959		9,823
Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	5,105,137		4,406,848
Debt Securities, Held-to-maturity, gross	2,255,340		2,538,565
Available for sale securities	6,834,720		5,814,496
Fair value option securities	20,671		296,590
Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	37,413		21,484
Debt Securities, Held-to-maturity, gross	120,705		170,629
Available for sale securities	502,833		624,500
U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	925		898
Residential non-agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	799,877		577,576
Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	17,258		17,259
Available for sale securities	4,147,853		4,475,917
Other debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	39,996		26,006
Debt Securities, Held-to-maturity, gross	15,787		12,788
Available for sale securities	473		473
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	947,613		943,810
Interest-bearing cash and cash equivalents	400,652		457,906
Trading securities	5,193,505		4,464,161
Debt Securities, Held-to-maturity, gross	2,244,489		2,514,245
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(336)		(558)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,244,153		2,513,687
Available for sale securities	12,286,681		11,493,860
Fair value option securities	20,671		296,590
Residential mortgage loans held for sale	56,935		75,272
Loans and Leases Receivable, Gross	23,904,968		22,557,150
Allowance for loan losses	(277,123)		(235,704)
Loans, net of allowance	23,627,845		22,321,446
Mortgage servicing rights	293,884		277,608
Derivative contracts, net of cash margin, Assets, Fair Value	410,304		880,343
Deposits with no stated maturity	31,007,679		33,018,863
Time deposits	3,012,022		1,461,842
Other borrowed funds	8,824,300		7,007,285
Subordinated debentures	131,150		131,205
Derivative contracts, net of cash margin, Liabilities, Fair Value	587,473		554,900
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	14,803,769		14,212,499
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	5,337,647		4,606,777
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	3,763,552		3,737,874
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,959		9,823
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	5,105,137		4,406,848
Debt Securities, Held-to-maturity, gross	2,092,083		2,315,219
Available for sale securities	6,834,720		5,814,496
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	37,413		21,484
Debt Securities, Held-to-maturity, gross	120,705		170,629
Available for sale securities	502,833		624,500
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	39,996		26,006
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	925		898
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	799,877		577,576
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	15,914		15,609
Available for sale securities	4,147,853		4,475,917
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	15,787		12,788
Available for sale securities	473		473
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	947,613		943,810
Interest-bearing cash and cash equivalents	400,652		457,906
Trading securities	5,193,505		4,464,161
Debt Securities, Held-to-maturity, gross	2,072,586		2,346,768
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0		0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,072,586		2,346,768
Available for sale securities	12,286,681		11,493,860
Fair value option securities	20,671		296,590
Residential mortgage loans held for sale	56,935		75,272
Loans and Leases Receivable, Gross	23,768,385		21,891,223
Allowance for loan losses	0		0
Loans, net of allowance	23,768,385		21,891,223
Mortgage servicing rights	293,884		277,608
Derivative contracts, net of cash margin, Assets, Fair Value	410,304		880,343
Deposits with no stated maturity	31,007,679		33,018,863
Time deposits	2,993,685		1,431,245
Other borrowed funds	8,824,299		7,005,305
Subordinated debentures	115,798		121,497
Derivative contracts, net of cash margin, Liabilities, Fair Value	587,473		554,900
Estimate of Fair Value Measurement [Member] | Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	14,862,873		13,905,765
Estimate of Fair Value Measurement [Member] | Commercial real estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	5,270,657		4,454,048
Estimate of Fair Value Measurement [Member] | Loans to individuals [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and Leases Receivable, Gross	3,634,855		3,531,410
Estimate of Fair Value Measurement [Member] | U.S. government securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	10,959		9,823
Estimate of Fair Value Measurement [Member] | Residential agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	5,105,137		4,406,848
Debt Securities, Held-to-maturity, gross	1,917,810		2,143,360
Available for sale securities	6,834,720		5,814,496
Estimate of Fair Value Measurement [Member] | Municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	37,413		21,484
Debt Securities, Held-to-maturity, gross	125,525		176,621
Available for sale securities	502,833		624,500
Estimate of Fair Value Measurement [Member] | Other trading securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading securities	39,996		26,006
Estimate of Fair Value Measurement [Member] | U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale securities	925		898
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	799,877		577,576
Estimate of Fair Value Measurement [Member] | Commercial agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Held-to-maturity, gross	15,067		14,588
Available for sale securities	4,147,853		4,475,917
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	14,184		12,199
Available for sale securities	473		473
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	947,613		943,810
Interest-bearing cash and cash equivalents	400,652		457,906
Trading securities	9,017		4,970
Debt Securities, Held-to-maturity, gross	0		0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0		0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	0		0
Available for sale securities	925		898
Fair value option securities	0		0
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
Derivative contracts, net of cash margin, Assets, Fair Value	0		2,110
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	2,607		16
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 and Leases Receivable, Gross	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 and Leases Receivable, Gross	0		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 and Leases Receivable, Gross	0		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	9,017		4,970
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		0
Available for sale securities	0		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		0
Available for sale securities	0		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	925		898
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]
Debt Securities, Held-to-maturity, gross	0		0
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		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	5,184,488		4,459,191
Debt Securities, Held-to-maturity, gross	1,959,366		2,208,253
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0		0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	1,959,366		2,208,253
Available for sale securities	12,285,283		11,492,489
Fair value option securities	20,671		296,590
Residential mortgage loans held for sale	49,749		68,054
Loans and Leases Receivable, Gross	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	410,304		878,233
Deposits with no stated maturity	0		0
Time deposits	0		0
Other borrowed funds	0		0
Subordinated debentures	115,798		121,497
Derivative contracts, net of cash margin, Liabilities, Fair Value	584,866		554,884
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 and Leases Receivable, Gross	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 and Leases Receivable, Gross	0		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 and Leases Receivable, Gross	0		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	1,942		4,853
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	5,105,137		4,406,848
Debt Securities, Held-to-maturity, gross	1,917,810		2,143,360
Available for sale securities	6,834,720		5,814,496
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	37,413		21,484
Debt Securities, Held-to-maturity, gross	12,305		38,106
Available for sale securities	502,833		624,500
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	39,996		26,006
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, 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	799,877		577,576
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]
Debt Securities, Held-to-maturity, gross	15,067		14,588
Available for sale securities	4,147,853		4,475,917
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	14,184		12,199
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	113,220		138,515
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0		0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	113,220		138,515
Available for sale securities	473		473
Fair value option securities	0		0
Residential mortgage loans held for sale	7,186		7,218
Loans and Leases Receivable, Gross	23,768,385		21,891,223
Allowance for loan losses	0		0
Loans, net of allowance	23,768,385		21,891,223
Mortgage servicing rights	293,884		277,608
Derivative contracts, net of cash margin, Assets, Fair Value	0		0
Deposits with no stated maturity	31,007,679		33,018,863
Time deposits	2,993,685		1,431,245
Other borrowed funds	8,824,299		7,005,305
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 and Leases Receivable, Gross	14,862,873		13,905,765
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 and Leases Receivable, Gross	5,270,657		4,454,048
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 and Leases Receivable, Gross	3,634,855		3,531,410
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		0
Available for sale securities	0		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	113,220		138,515
Available for sale securities	0		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, 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]
Debt Securities, Held-to-maturity, gross	0		0
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		0
Available for sale securities	$ 473		$ 473

[1] Carrying value includes $165 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio.

[2] Carrying value includes $225 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available for Sale securities portfolio to the Investment securities portfolio.