Parent Company Balance Sheet (Details) - USD ($)		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Deferred tax asset		$ 61,423,000	$ 39,494,000
Derivative Asset		76,705,000	26,113,000
Other Assets		343,353,000	132,507,000
Total assets		11,395,165,000	8,851,592,000
Liabilities and stockholders’ equity
Long-term Debt		74,906,000	0
Junior subordinated debentures (less unamortized debt issuance costs of $40 and $118)		62,848,000	76,173,000
Subordinated debentures (less unamortized debt issuance costs of $399 and $272)		49,601,000	34,728,000
Other liabilities		236,552,000	92,275,000
Total liabilities		9,687,022,000	7,778,102,000
Stockholders’ equity		1,708,143,000	1,073,490,000	$ 943,809,000	$ 864,690,000
Liabilities and Equity		11,395,165,000	8,851,592,000
Parent Company [Member]
Assets:
Cash	[1]	135,688,000	64,256,000
Investments in subsidiaries	[2]	1,743,435,000	1,128,407,000
Prepaid income taxes		31,586,000	1,014,000
Deferred tax asset		612,000
Derivative Asset	[1]	290,000	1,711,000
Other Assets		0	37,000
Total assets		1,911,611,000	1,195,425,000
Liabilities and stockholders’ equity
Dividends payable		15,126,000	10,671,000
Long-term Debt		74,906,000	0
Junior subordinated debentures (less unamortized debt issuance costs of $40 and $118)		62,848,000	76,173,000
Subordinated debentures (less unamortized debt issuance costs of $399 and $272)		49,601,000	34,728,000
Other liabilities		987,000	363,000
Total liabilities		203,468,000	121,935,000
Stockholders’ equity		1,708,143,000	1,073,490,000
Liabilities and Equity		1,911,611,000	1,195,425,000
Junior Subordinated Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		40,000	118,000
Junior Subordinated Debt [Member] | Parent Company [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		40,000	118,000
Long-term Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		94,000	0
Long-term Debt [Member] | Parent Company [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		94,000	0
Subordinated Debt [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		399,000	272,000
Subordinated Debt [Member] | Parent Company [Member]
Liabilities and stockholders’ equity
Unamortized Debt Issuance Expense		$ 399,000	$ 272,000

[1] Entire balance eliminates in consolidation.

[2] Majority of balance eliminates in consolidation