Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Total securities available for sale	$ 69,355,000	$ 63,389,000
Mortgage servicing rights	1,627,000	1,983,000
Financial derivatives	2,231,000	1,052,000
Liabilities
Financial derivatives	604,000	1,063,000
Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	69,355,000	63,389,000
Loans	755,000	782,000
Equity investments	2,193,000	2,209,000
Trading securities	2,558,000	3,916,000
Financial derivatives	3,546,000	2,081,000
Other assets	457,000	493,000
Total Assets	81,586,000	75,744,000
Liabilities
Other borrowed funds	913,000	1,007,000
Financial derivatives	2,002,000	2,290,000
Other liabilities	78,000	58,000
Total liabilities	2,993,000	3,355,000
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	18,902,000	17,753,000
Equity investments	675,000	751,000
Trading securities	853,000	2,137,000
Financial derivatives	2,000	3,000
Other assets	322,000	291,000
Total Assets	20,754,000	20,935,000
Liabilities
Other borrowed funds	709,000	868,000
Financial derivatives	5,000	1,000
Total liabilities	714,000	869,000
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	48,136,000	43,150,000
Loans	496,000	510,000
Trading securities	1,705,000	1,777,000
Financial derivatives	3,458,000	2,053,000
Other assets	135,000	157,000
Total Assets	54,950,000	48,449,000
Liabilities
Other borrowed funds	199,000	132,000
Financial derivatives	1,776,000	2,021,000
Total liabilities	1,975,000	2,153,000
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	2,317,000	2,486,000
Loans	259,000	272,000
Equity investments	1,323,000	1,255,000
Trading securities		2,000
Financial derivatives	86,000	25,000
Other assets		45,000
Total Assets	5,687,000	6,157,000
Liabilities
Other borrowed funds	5,000	7,000
Financial derivatives	221,000	268,000
Other liabilities	78,000	58,000
Total liabilities	304,000	333,000
Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	697,000	495,000
Mortgage servicing rights	997,000	1,257,000
Residential Mortgage [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	695,000	493,000
Residential Mortgage [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	2,000	2,000
Mortgage servicing rights	997,000	1,257,000
Commercial Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	398,000	396,000
Mortgage servicing rights	630,000	726,000
Commercial Mortgage [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	325,000	309,000
Commercial Mortgage [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	73,000	87,000
Mortgage servicing rights	630,000	726,000
US Treasury and Government [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	19,182,000	18,100,000
US Treasury and Government [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	18,902,000	17,753,000
US Treasury and Government [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	280,000	347,000
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	33,820,000	28,993,000
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	2,057,000	2,211,000
Residential Mortgage-backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	33,820,000	28,993,000
Residential Mortgage-backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	81,000	83,000
Residential Mortgage-backed Securities [Member] \| Level 3 [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	1,976,000	2,128,000
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	2,585,000	2,577,000
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	3,004,000	2,657,000
Commercial Mortgage Backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	2,585,000	2,577,000
Commercial Mortgage Backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	3,004,000	2,657,000
Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	5,419,000	4,972,000
Asset backed [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	5,158,000	4,698,000
Asset backed [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	261,000	274,000
Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	3,288,000	3,879,000
Other [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	3,208,000	3,795,000
Other [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for sale	$ 80,000	$ 84,000

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