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Note 11 - Other Borrowings and Subordinated Debentures - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other borrowings $ 1,380,024 $ 273,159
Subordinated debentures 140,565 60,397
Subordinated Debentures 140,565 60,397
Total other borrowings and subordinated debentures 1,520,589 333,556
U.S. Bank National Association [Member] | Revolving Credit Facility [Member]    
Revolving credit agreement, due 10/5/2018, floating rate of 1.50% above the one month LIBOR rate, unsecured 75,000
Federal Home Loan Bank Advances [Member]    
FHLB advances, net of discount, due 2018 to 2033, 1.20% to 7.37% secured by residential real estate loans 1,261,642 225,230
Note Payable Due 10/15/2020 [Member]    
Notes payable, due 10/15/2020, 3.85%, fixed rate, unsecured 43,382 47,929
Trust Preferred Securities Due 12/30/2033 Floating Rate of 2.8% Above Three Month LIBOR 1 [Member]    
Subordinated debentures 20,620 20,620
Subordinated Debentures 20,620 20,620
Trust Preferred Securities Due 6/30/2035 [Member]    
Subordinated debentures 9,327 9,225
Subordinated Debentures 9,327 9,225
Trust Preferred Securities Due 9/15/2037 [Member]    
Subordinated debentures 10,284 10,130
Subordinated Debentures 10,284 10,130
Trust Preferred Securities Due 12/5/2033 [Member]    
Subordinated debentures 5,156 5,161
Subordinated Debentures 5,156 5,161
Trust Preferred Securities Due 10/18/2034 [Member]    
Subordinated debentures 5,148 5,105
Subordinated Debentures 5,148 5,105
Trust Preferred Securities, Due 6/6/2037 [Member]    
Subordinated debentures 10,288 10,156
Subordinated Debentures 10,288 10,156
Trust Preferred Securities, Due 12/15/2035 [Member]    
Subordinated debentures 6,702
Subordinated Debentures 6,702
Trust Preferred Securities, Due 6/26/2033 [Member]    
Subordinated debentures 20,619
Subordinated Debentures 20,619
Trust Preferred Securities, Due 10/7/2033 [Member]    
Subordinated debentures 25,774
Subordinated Debentures 25,774
Second Trust Preferred Securities Due 9/15/2037 [Member]    
Subordinated debentures 8,248
Subordinated Debentures 8,248
Trust Preferred Securities, Due 9/30/2023 [Member]    
Subordinated debentures 18,399
Subordinated Debentures $ 18,399