Parent Company Only Financial Statements Parent Company Only Financial Statements (Tables)

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Condensed Balance Sheet [Table Text Block]

Balance Sheets

(In thousands)

	December 31,
	2018			2017
Assets
Cash and cash equivalents	$	167,093		$	205,876
Available for sale securities	—			16,185
Loan to bank subsidiary	65,228			—
Investment in bank subsidiaries	4,236,654			3,255,912
Investment in non-bank subsidiaries	218,007			170,966
Other assets	32,999			4,065
Total assets	$	4,719,981		$	3,653,004
Liabilities and Shareholders’ Equity
Liabilities:
Other liabilities	$	11,959		$	12,960
Subordinated debentures	275,913			144,677
Total liabilities	287,872			157,637
Shareholders’ equity:
Common stock	5			4
Capital surplus	1,334,030			1,035,895
Retained earnings	3,369,654			3,048,487
Treasury stock	(72,585		)	(36,174		)
Accumulated other comprehensive loss	(198,995		)	(552,845		)
Total shareholders’ equity	4,432,109			3,495,367
Total liabilities and shareholders’ equity	$	4,719,981		$	3,653,004

Condensed Income Statement [Table Text Block]

Statements of Earnings

(In thousands)

	Year Ended December 31,
	2018			2017			2016
Dividends, interest and fees received from bank subsidiaries	$	426,071		$	150,149		$	15,237
Dividends, interest and fees received from non-bank subsidiaries	12,800			17,500			25,923
Other revenue	954			936			1,612
Total revenue	439,825			168,585			42,772
Interest expense	9,827			8,239			4,182
Other operating expense	12,110			2,014			1,978
Total expense	21,937			10,253			6,160
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries	417,888			158,332			36,612
Other losses, net	(3,921		)	—			—
Net income before taxes and equity in undistributed income of subsidiaries	413,967			158,332			36,612
Federal and state income taxes	(7,078		)	(4,305		)	(1,920		)
Net income before equity in undistributed income of subsidiaries	421,045			162,637			38,532
Equity in undistributed income of bank subsidiaries	37,515			181,552			216,120
Equity in undistributed income of non-bank subsidiaries	(12,914		)	(9,545		)	(21,984		)
Net income attributable to BOK Financial Corp. shareholders	$	445,646		$	334,644		$	232,668

Condensed Cash Flow Statement [Table Text Block]

Statements of Cash Flows

(In thousands)

	Year Ended December 31,
	2018			2017			2016
Cash Flows From Operating Activities:
Net income	$	445,646		$	334,644		$	232,668
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income of bank subsidiaries	(37,515		)	(181,552		)	(216,120		)
Equity in undistributed income of non-bank subsidiaries	12,914			9,545			21,984
Change in other assets	(1,072		)	12			(2,933		)
Change in other liabilities	(13,434		)	7,457			(1,285		)
Net cash provided by operating activities	406,539			170,106			34,314
Cash Flows From Investing Activities:
Proceeds from sales of available for sale securities	—			3,000			1,632
Investment in subsidiaries	(31,901		)	(4,355		)	(26,000		)
Acquisitions, net of cash acquired	(232,680		)	—			(105,520		)
Net cash used in investing activities	(264,581		)	(1,355		)	(129,888		)
Cash Flows From Financing Activities:
Net change in other borrowed funds	—			(7,217		)	—
Issuance of subordinated debentures, net of issuance costs	—			—			144,615
Issuance of common and treasury stock, net	(88		)	4,368			12,455
Dividends paid	(127,188		)	(116,041		)	(113,455		)
Repurchase of common stock	(53,465		)	(7,403		)	(66,792		)
Net cash used in financing activities	(180,741		)	(126,293		)	(23,177		)
Net increase (decrease) in cash and cash equivalents	(38,783		)	42,458			(118,751		)
Cash and cash equivalents at beginning of period	205,876			163,418			282,169
Cash and cash equivalents at end of period	$	167,093		$	205,876		$	163,418
Cash paid for interest	$	11,457		$	6,211		$	4,127