Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Interest and fees on loans	$ 663,935	$ 574,712
Interest on debt securities available for sale	56,602	51,997
Interest on debt securities held to maturity	12,426	6,639
Interest on trading account assets	750	10,297
Interest and dividends on other earning assets	11,875	12,143
Total interest income	745,588	655,788
Interest expense:
Interest on deposits	97,347	70,304
Interest on FHLB and other borrowings	24,756	19,068
Interest on federal funds purchased and securities sold under agreements to repurchase	536	4,897
Interest on other short-term borrowings	344	10,086
Total interest expense	122,983	104,355
Net interest income	622,605	551,433
Provision for loan losses	57,029	80,139
Net interest income after provision for loan losses	565,576	471,294
Noninterest income:
Service charges on deposit accounts	56,161	55,168
Card and merchant processing fees	39,678	29,992
Retail investment sales	30,108	27,471
Investment banking and advisory fees	23,896	28,301
Money transfer income	20,688	25,197
Corporate and correspondent investment sales	12,056	8,915
Asset management fees	10,770	9,771
Mortgage banking	8,397	2,870
Bank owned life insurance	4,215	4,169
Other	51,856	52,833
Total noninterest income	257,825	244,687
Noninterest expense:
Salaries, benefits and commissions	289,440	268,015
Equipment	63,360	61,630
Professional services	60,645	57,807
Net occupancy	40,422	42,101
Money transfer expense	13,721	16,324
Amortization of intangibles	1,592	2,525
Securities impairment:
Other-than-temporary impairment	571	242
Less: non-credit portion recognized in other comprehensive income	262	0
Securities impairment	309	242
Other	93,424	100,668
Total noninterest expense	562,913	549,312
Net income before income tax expense	260,488	166,669
Income tax expense	51,798	45,846
Net income	208,690	120,823
Less: net income attributable to noncontrolling interests	461	443
Net income attributable to BBVA Compass Bancshares, Inc.	208,229	120,380
Less: preferred stock dividends	3,864	3,548
Net income attributable to common shareholder	$ 204,365	$ 116,832