Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net interest income:
Interest income from securities	$ 8,275us-gaap_InvestmentIncomeInterest	$ 6,129us-gaap_InvestmentIncomeInterest	$ 4,366us-gaap_InvestmentIncomeInterest	$ 2,419us-gaap_InvestmentIncomeInterest	$ 3,633us-gaap_InvestmentIncomeInterest	$ 2,533us-gaap_InvestmentIncomeInterest	$ 3,014us-gaap_InvestmentIncomeInterest	$ 3,087us-gaap_InvestmentIncomeInterest	$ 21,189us-gaap_InvestmentIncomeInterest	$ 12,267us-gaap_InvestmentIncomeInterest	$ 15,347us-gaap_InvestmentIncomeInterest
Interest income from securities, held to maturity	3,165	1,448	0	0	0	0	0	0	4,613	0	0
Interest income from commercial mortgage loans	9,328	8,025	6,438	4,011	3,812	4,954	3,676	3,592	27,802	16,034	10,780
Interest income from subordinate loans	17,021	19,754	18,238	14,730	14,026	12,184	11,498	11,454	69,743	49,162	24,666
Interest income from repurchase agreements	0	0	0	0	0	0	0	2	0	0	6,286
Interest expense	(10,740)us-gaap_InterestExpense	(8,786)us-gaap_InterestExpense	(5,258)us-gaap_InterestExpense	(1,757)us-gaap_InterestExpense	(1,450)us-gaap_InterestExpense	(885)us-gaap_InterestExpense	(955)us-gaap_InterestExpense	(1,068)us-gaap_InterestExpense	(26,541)us-gaap_InterestExpense	(4,356)us-gaap_InterestExpense	(8,402)us-gaap_InterestExpense
Net interest income	27,049us-gaap_InterestIncomeExpenseNet	26,570us-gaap_InterestIncomeExpenseNet	23,784us-gaap_InterestIncomeExpenseNet	19,403us-gaap_InterestIncomeExpenseNet	20,021us-gaap_InterestIncomeExpenseNet	18,786us-gaap_InterestIncomeExpenseNet	17,233us-gaap_InterestIncomeExpenseNet	17,067us-gaap_InterestIncomeExpenseNet	96,806us-gaap_InterestIncomeExpenseNet	73,107us-gaap_InterestIncomeExpenseNet	48,677us-gaap_InterestIncomeExpenseNet
Operating expenses:
General and administrative expenses (includes equity-based compensation of $1,576 in 2014, $3,488 in 2013 and $3,624 in 2012)	(1,796)us-gaap_GeneralAndAdministrativeExpense	(1,434)us-gaap_GeneralAndAdministrativeExpense	(1,479)us-gaap_GeneralAndAdministrativeExpense	(1,442)us-gaap_GeneralAndAdministrativeExpense	(2,438)us-gaap_GeneralAndAdministrativeExpense	(1,793)us-gaap_GeneralAndAdministrativeExpense	(1,437)us-gaap_GeneralAndAdministrativeExpense	(1,895)us-gaap_GeneralAndAdministrativeExpense	(6,151)us-gaap_GeneralAndAdministrativeExpense	(7,563)us-gaap_GeneralAndAdministrativeExpense	(8,543)us-gaap_GeneralAndAdministrativeExpense
Management fees to related party	(3,236)	(3,193)	(2,966)	(2,565)	(2,627)	(2,625)	(2,600)	(2,160)	(11,960)	(10,012)	(6,139)
Total operating expenses	(5,032)us-gaap_OperatingExpenses	(4,627)us-gaap_OperatingExpenses	(4,445)us-gaap_OperatingExpenses	(4,007)us-gaap_OperatingExpenses	(5,065)us-gaap_OperatingExpenses	(4,418)us-gaap_OperatingExpenses	(4,037)us-gaap_OperatingExpenses	(4,055)us-gaap_OperatingExpenses	(18,111)us-gaap_OperatingExpenses	(17,575)us-gaap_OperatingExpenses	(14,682)us-gaap_OperatingExpenses
Income from unconsolidated joint venture	(69)	(88)	0	0	0	0	0	0	(157)	0	0
Interest income from cash balances	9us-gaap_OtherNonoperatingIncome	21us-gaap_OtherNonoperatingIncome	4us-gaap_OtherNonoperatingIncome	0us-gaap_OtherNonoperatingIncome	1us-gaap_OtherNonoperatingIncome	3us-gaap_OtherNonoperatingIncome	16us-gaap_OtherNonoperatingIncome	0us-gaap_OtherNonoperatingIncome	34us-gaap_OtherNonoperatingIncome	20us-gaap_OtherNonoperatingIncome	7us-gaap_OtherNonoperatingIncome
Realized gain on sale of securities									0	0	262
Unrealized gain (loss) on securities	(639)us-gaap_UnrealizedGainLossOnSecurities	(2,147)us-gaap_UnrealizedGainLossOnSecurities	4,749us-gaap_UnrealizedGainLossOnSecurities	2,184us-gaap_UnrealizedGainLossOnSecurities	908us-gaap_UnrealizedGainLossOnSecurities	(1,472)us-gaap_UnrealizedGainLossOnSecurities	(1,421)us-gaap_UnrealizedGainLossOnSecurities	(1,080)us-gaap_UnrealizedGainLossOnSecurities	4,147us-gaap_UnrealizedGainLossOnSecurities	(3,065)us-gaap_UnrealizedGainLossOnSecurities	6,489us-gaap_UnrealizedGainLossOnSecurities
Foreign currency gain (loss)	(1,413)	(3,596)	959	0	0	0	0	0	(4,050)
Gain (loss) on derivative instruments (includes unrealized gains (losses) of $4,070 in 2014, $155 in 2013 and $323 in 2012)	2,137	3,026	(1,093)	0	(1)	1	(2)	0	4,070	(2)	(572)
Net income	22,042us-gaap_NetIncomeLoss	19,159us-gaap_NetIncomeLoss	23,958us-gaap_NetIncomeLoss	17,580us-gaap_NetIncomeLoss	15,864us-gaap_NetIncomeLoss	12,900us-gaap_NetIncomeLoss	11,789us-gaap_NetIncomeLoss	11,932us-gaap_NetIncomeLoss	82,739us-gaap_NetIncomeLoss	52,485us-gaap_NetIncomeLoss	40,181us-gaap_NetIncomeLoss
Preferred dividends									(7,440)	(7,440)	(3,079)
Net income available to common stockholders	$ 20,182	$ 17,299	$ 22,098	$ 15,720	$ 14,004	$ 11,040	$ 9,929	$ 10,072	$ 75,299	$ 45,045	$ 37,102
Basic and diluted net income per share of common stock (in dollars per share)	$ 0.43us-gaap_EarningsPerShareBasicAndDiluted	$ 0.37us-gaap_EarningsPerShareBasicAndDiluted	$ 0.51us-gaap_EarningsPerShareBasicAndDiluted	$ 0.42us-gaap_EarningsPerShareBasicAndDiluted	$ 0.37us-gaap_EarningsPerShareBasicAndDiluted	$ 0.30us-gaap_EarningsPerShareBasicAndDiluted	$ 0.27us-gaap_EarningsPerShareBasicAndDiluted	$ 0.33us-gaap_EarningsPerShareBasicAndDiluted	$ 1.72us-gaap_EarningsPerShareBasicAndDiluted	$ 1.26us-gaap_EarningsPerShareBasicAndDiluted	$ 1.64us-gaap_EarningsPerShareBasicAndDiluted
Basic weighted average shares of common stock outstanding	46,852,646	46,848,675	42,888,747	37,122,842	36,886,619	36,883,002	36,880,410	30,105,939	43,464,255	35,212,211	22,259,386
Diluted weighted average shares of common stock outstanding	47,085,617	47,068,929	43,099,354	37,341,050	37,390,369	37,379,469	37,373,885	30,480,689	43,684,805	35,679,755	22,648,819

Interest and Fee Income, Loans, Repurchase Agreements

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